Developmental Disturbances of Teeth Classification
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Questions and Answers

What characterizes the crowns of shell teeth?

  • They are completely normal in shape and size.
  • They are bulbous with short roots. (correct)
  • They show signs of excessive wear and thinning.
  • They are larger than normal with constricted necks.

    • What is a common consequence of caries in shell teeth?

  • Excessive enamel growth.
  • Early pulp exposure. (correct)
  • Formation of multiple teeth.
  • Total pulp chamber obliteration.

    • How does the dentine of shell teeth differ from that of a normal tooth?

  • It is calcified and dense.
  • It is hyper-mineralized and smooth.
  • It contains many more dentinal tubules.
  • It lacks a normal odontoblastic layer. (correct)

    • Which of the following describes a common radiographic feature of shell teeth?

    <p>Partial or total obliteration of the pulp chambers.</p> Signup and view all the answers

    What unusual feature is observed in the dentinal tubules of shell teeth?

    <p>They are poorly calcified with interglobular spaces.</p> Signup and view all the answers

    What is a likely clinical presentation of acquired generalized enamel hypoplasia?

    <p>Horizontally oriented rows of pits on the enamel surface</p> Signup and view all the answers

    What characteristic distinguishes dental fluorosis from other enamel defects?

    <p>Mottled appearance affecting mainly permanent teeth</p> Signup and view all the answers

    What effect does a prolonged environmental insult have on enamel hypoplasia?

    <p>It produces a wider zone of hypoplasia</p> Signup and view all the answers

    At what fluoride concentration in drinking water is dental fluorosis likely to occur?

    <p>Greater than 1.5 ppm</p> Signup and view all the answers

    What is one of the main effects of increased fluoride levels on tooth development?

    <p>Interferes with ameloblastic function</p> Signup and view all the answers

    How is tetracycline pigment deposition characterized in developing teeth?

    <p>Produces discoloration of calcifying tissues</p> Signup and view all the answers

    What clinical grade represents very mild dental fluorosis?

    <p>Small white opaque areas involving less than 25% of the surface area</p> Signup and view all the answers

    What is Dentinogenesis Imperfecta commonly referred to as?

    <p>Hereditary Brown Opalescent Dentin</p> Signup and view all the answers

    Which supernumerary tooth is located between the maxillary central incisors?

    <p>Mesiodens</p> Signup and view all the answers

    What condition is associated with multiple impacted supernumerary teeth?

    <p>Cleidocranial dysostosis</p> Signup and view all the answers

    Which feature characterizes supplemental teeth?

    <p>They morphologically resemble adjoining teeth.</p> Signup and view all the answers

    Which statement accurately describes hereditary structural anomalies in teeth?

    <p>They affect both deciduous and permanent dentitions.</p> Signup and view all the answers

    What distinguishing feature characterizes acquired factors affecting teeth?

    <p>They create horizontally oriented enamel defects.</p> Signup and view all the answers

    Which type of microdontia involves all teeth being smaller than normal?

    <p>Generalized microdontia</p> Signup and view all the answers

    Amelogenesis imperfecta is primarily associated with which type of defect?

    <p>Hereditary enamel formation disorders.</p> Signup and view all the answers

    What is the most commonly affected tooth in localized microdontia?

    <p>Maxillary lateral incisor</p> Signup and view all the answers

    What dental condition is characterized by an enlarged pulp chamber and short roots?

    <p>Taurodontism</p> Signup and view all the answers

    What is one potential complication of impacted supernumerary teeth?

    <p>Dentigerous cysts</p> Signup and view all the answers

    Which of the following is NOT a characteristic of hereditary anomalies in dental structure?

    <p>They are often associated with nutritional deficiencies.</p> Signup and view all the answers

    Which type of teeth are most commonly affected by taurodontism?

    <p>Molars</p> Signup and view all the answers

    Which developmental defect primarily results from acquired environmental factors?

    <p>Enamel defects due to trauma.</p> Signup and view all the answers

    What is the defining feature of an enamel pearl?

    <p>A small, spherical projection on the root surface</p> Signup and view all the answers

    What is a common systemic factor that can lead to developmental enamel defects?

    <p>Nutritional deficiencies.</p> Signup and view all the answers

    How may cleidocranial dysplasia manifest clinically?

    <p>Delayed eruption of permanent teeth.</p> Signup and view all the answers

    What causes dens invaginatus?

    <p>Invagination of the enamel organ into the dental papilla</p> Signup and view all the answers

    Which type of enamel defect is characterized by the presence of pits or defects that are horizontally oriented?

    <p>Acquired environmental defects.</p> Signup and view all the answers

    In taurodontism, where is the bifurcation or trifurcation typically located?

    <p>Near the apices of the roots</p> Signup and view all the answers

    What condition is often associated with the absence of upper lateral incisors?

    <p>Cleft palate</p> Signup and view all the answers

    What is the primary diagnostic method for detecting supernumerary roots?

    <p>Radiographic imaging</p> Signup and view all the answers

    Which of the following patterns of enamel defects is commonly associated with hereditary structural anomalies?

    <p>Diffuse or vertically oriented defects.</p> Signup and view all the answers

    Which teeth are most commonly congenitally absent?

    <p>Maxillary lateral incisors</p> Signup and view all the answers

    What are supernumerary roots most commonly found in?

    <p>Mandibular premolars</p> Signup and view all the answers

    What histological components may be present in an enamel pearl?

    <p>Enamel, dentin, and pulp</p> Signup and view all the answers

    What is the likely cause of total or partial anodontia?

    <p>Genetic disorders</p> Signup and view all the answers

    What describes predeciduous dentition?

    <p>Rudimentary teeth that are present at birth</p> Signup and view all the answers

    How are supernumerary teeth defined?

    <p>Extra teeth that do not morphologically resemble adjacent normal teeth</p> Signup and view all the answers

    Which of the following is typically a sign of hypodontia?

    <p>Missing one or more permanent teeth</p> Signup and view all the answers

    What condition describes teeth that are formed after the permanent dentition?

    <p>Post-permanent dentition</p> Signup and view all the answers

    Which of the following statements about hair follicles is accurate in relation to certain conditions?

    <p>Defective or absent hair follicles can lead to dry skin conditions</p> Signup and view all the answers

    The crowns of shell teeth are characterized by larger and normal root canals.

    <p>False</p> Signup and view all the answers

    The teeth affected by shell teeth syndrome typically display color variations from bluish-gray to brown.

    <p>True</p> Signup and view all the answers

    A distinguishing feature of shell teeth is the obliteration of the pulp chamber.

    <p>False</p> Signup and view all the answers

    Shell teeth have histologically normal enamel and a straight amelodentinal junction.

    <p>True</p> Signup and view all the answers

    The roots of teeth affected by shell teeth are extremely long.

    <p>False</p> Signup and view all the answers

    Hereditary structural anomalies usually affect both the deciduous and permanent dentitions.

    <p>True</p> Signup and view all the answers

    Acquired factors are known to affect both enamel and dentine.

    <p>True</p> Signup and view all the answers

    Amelogenesis imperfecta affects the deciduous dentition but not the permanent dentition.

    <p>False</p> Signup and view all the answers

    Hereditary anomalies usually produce horizontally oriented enamel defects.

    <p>False</p> Signup and view all the answers

    Systemic factors contributing to enamel defects can include nutritional deficiencies.

    <p>True</p> Signup and view all the answers

    Acquired environmental factors will usually affect all teeth undergoing development.

    <p>False</p> Signup and view all the answers

    Hereditary enamel defects can result from both hereditary enamel hypoplasia and hypo-calcification.

    <p>True</p> Signup and view all the answers

    Acquired defects primarily affect the primary dentition exclusively.

    <p>False</p> Signup and view all the answers

    The absence of sebaceous glands can lead to oily skin.

    <p>False</p> Signup and view all the answers

    Total or partial anodontia refers to the failure of development of one or more permanent teeth.

    <p>True</p> Signup and view all the answers

    Supernumerary teeth are more common in the mandible than in the maxilla.

    <p>False</p> Signup and view all the answers

    Predeciduous dentition is a common occurrence in the infant population.

    <p>False</p> Signup and view all the answers

    Hypodontia is commonly associated with the absence of the third molars and maxillary lateral incisors.

    <p>True</p> Signup and view all the answers

    Salivary gland hypoplasia is frequently associated with xerostomia.

    <p>True</p> Signup and view all the answers

    The etiology of congenital missing teeth is well understood and primarily caused by environmental factors.

    <p>False</p> Signup and view all the answers

    Supernumerary teeth can be normal in shape and resemble adjacent teeth.

    <p>False</p> Signup and view all the answers

    Taurodontism is characterized by the enlargement of the tooth trunk at the expense of the roots.

    <p>True</p> Signup and view all the answers

    Supernumerary roots are typically found in upper incisors.

    <p>False</p> Signup and view all the answers

    An enamel pearl is a small, spherical enamel projection usually found on maxillary molars.

    <p>True</p> Signup and view all the answers

    Dens invaginatus results from the failure of Hertwig's epithelial root sheath to invaginate.

    <p>False</p> Signup and view all the answers

    The pulp chamber in taurodontism is often smaller than normal with cervical constriction.

    <p>False</p> Signup and view all the answers

    Both permanent and deciduous teeth can be affected by taurodontism.

    <p>True</p> Signup and view all the answers

    Enamel pearls may consist of enamel only or enamel, dentin, and pulp.

    <p>True</p> Signup and view all the answers

    Supernumerary teeth are often diagnosed visually without the need for radiographic examination.

    <p>False</p> Signup and view all the answers

    Total anodontia is the absence of all teeth and is commonly associated with hereditary ectodermal dysplasia.

    <p>True</p> Signup and view all the answers

    Hypodontia refers to the complete absence of teeth in an individual.

    <p>False</p> Signup and view all the answers

    Macrodontia is classified as an abnormality in number, indicating an excess of teeth.

    <p>False</p> Signup and view all the answers

    Partial anodontia can also be referred to as true anodontia when the absent teeth fail to develop.

    <p>True</p> Signup and view all the answers

    Dentinogenesis imperfecta refers to defects in enamel and dentin structure.

    <p>True</p> Signup and view all the answers

    Talon cusp is an anomaly associated with an abnormality in the type of tooth rather than its structure.

    <p>False</p> Signup and view all the answers

    Embedded teeth can be considered a form of abnormality in eruption.

    <p>True</p> Signup and view all the answers

    Gemination occurs when two teeth are fused together to form a single tooth entity.

    <p>False</p> Signup and view all the answers

    Gemination results in two completely separate crowns that have a single root and root canal.

    <p>False</p> Signup and view all the answers

    Concrescence occurs before root formation is complete.

    <p>False</p> Signup and view all the answers

    Fusion results in a reduction of the total number of teeth by one.

    <p>True</p> Signup and view all the answers

    Dilaceration is characterized by a sharp bend along the long axis of a tooth.

    <p>True</p> Signup and view all the answers

    Macrodontia refers to teeth that are smaller than normal.

    <p>False</p> Signup and view all the answers

    Talon cusp is an extra cusp that resembles an eagle's wing.

    <p>False</p> Signup and view all the answers

    The number of teeth is usually increased in cases of gemination.

    <p>False</p> Signup and view all the answers

    Concrescence is often caused by trauma or crowding of teeth.

    <p>True</p> Signup and view all the answers

    What is the location of a distomolar?

    <p>A distomolar is located distal to the third molar.</p> Signup and view all the answers

    What hereditary condition is associated with multiple impacted supernumerary teeth?

    <p>Multiple impacted supernumerary teeth may be associated with cleidocranial dysostosis.</p> Signup and view all the answers

    What defines localized microdontia?

    <p>Localized microdontia involves a single or a group of teeth that are smaller than normal.</p> Signup and view all the answers

    What dental condition can arise around impacted supernumerary teeth?

    <p>Impacted supernumerary teeth can develop dentigerous cysts around the crown.</p> Signup and view all the answers

    What is a major clinical manifestation of cleidocranial dysplasia?

    <p>A high arched palate is a major clinical manifestation of cleidocranial dysplasia.</p> Signup and view all the answers

    What characterizes generalized macrodontia?

    <p>Generalized macrodontia occurs when all teeth in both arches are larger than normal.</p> Signup and view all the answers

    What is the expected outcome for teeth affected by enamel hypoplasia?

    <p>Teeth with enamel hypoplasia may exhibit pits or defects on the enamel surface.</p> Signup and view all the answers

    What happens to deciduous teeth in cleidocranial dysplasia?

    <p>There is a delay in shedding of deciduous teeth in individuals with cleidocranial dysplasia.</p> Signup and view all the answers

    What are the main categories of developmental disturbances of teeth?

    <p>The main categories are abnormalities in number, size, shape, structure, and eruption.</p> Signup and view all the answers

    What is the difference between total anodontia and partial anodontia?

    <p>Total anodontia is the complete absence of all teeth, while partial anodontia involves the absence of a single tooth or a group of teeth.</p> Signup and view all the answers

    How is pseudo anodontia characterized?

    <p>Pseudo anodontia occurs when teeth fail to erupt despite their development, resulting in clinically absent teeth.</p> Signup and view all the answers

    What is hereditary ectodermal dysplasia and its relation to dental anomalies?

    <p>Hereditary ectodermal dysplasia is a hereditary defect that can lead to total or partial anodontia, primarily affecting males.</p> Signup and view all the answers

    Describe the condition known as taurodontism.

    <p>Taurodontism is characterized by an enlarged pulp chamber and short roots in teeth.</p> Signup and view all the answers

    What types of abnormalities can result from defective apposition and calcification?

    <p>Defective apposition and calcification can lead to enamel defects like amelogenesis imperfecta and dentin defects like dentinogenesis imperfecta.</p> Signup and view all the answers

    In what ways can teeth exhibit abnormalities in size?

    <p>Teeth can exhibit size abnormalities through conditions such as microdontia, where teeth are smaller than normal, or macrodontia, where they are larger.</p> Signup and view all the answers

    What potential issues can arise from embedded or impacted teeth?

    <p>Embedded or impacted teeth can lead to conditions like pseudo anodontia and may require surgical intervention for management.</p> Signup and view all the answers

    What is the appearance of dens in dente on a radiograph?

    <p>It appears as a tooth-like structure within the pulp of the involved tooth.</p> Signup and view all the answers

    What clinical features are associated with dens evaginatus?

    <p>It appears as an accessory cusp on premolars and may have a pulp horn extending into it.</p> Signup and view all the answers

    What unique features are found in the teeth of children born with congenital syphilis?

    <p>They often exhibit barrel-shaped permanent incisors with a central notch and may show enamel hypoplasia.</p> Signup and view all the answers

    Describe the typical appearance of Moon's molars.

    <p>Moon's molars exhibit a constricted occlusal surface with rounded angles and a dome shape.</p> Signup and view all the answers

    How do mulberry molars differ from normal first molars?

    <p>Mulberry molars have rough, pitted occlusal surfaces with multiple irregular tubercles replacing the normal cusps.</p> Signup and view all the answers

    What factors can lead to developmental disturbances in teeth?

    <p>Developmental disturbances can be hereditary or acquired due to local factors affecting individual teeth.</p> Signup and view all the answers

    What features characterize Hutchinson's teeth?

    <p>Hutchinson's teeth are barrel-shaped with tapered mesial and distal surfaces, often exhibiting a central notch.</p> Signup and view all the answers

    What is the primary mechanism thought to cause dens evaginatus?

    <p>It is thought to result from the proliferation and evagination of enamel epithelium during tooth development.</p> Signup and view all the answers

    What clinical presentation indicates a history of systemic factors causing enamel hypoplasia?

    <p>Horizontally oriented rows of pits on the enamel surface.</p> Signup and view all the answers

    How does the fluoride concentration in drinking water relate to dental fluorosis?

    <p>Ingestion of fluoride levels greater than 1.5 ppm can lead to enamel hypoplasia or hypocalcification, known as dental fluorosis.</p> Signup and view all the answers

    What is the primary adverse effect of high fluoride levels on ameloblasts?

    <p>Increased fluoride levels interfere with ameloblastic function, disrupting enamel matrix formation and calcification.</p> Signup and view all the answers

    What staining results from tetracycline exposure in developing teeth?

    <p>Tetracycline causes stained, hypoplastic enamel due to its binding to calcifying tissues.</p> Signup and view all the answers

    How is dental fluorosis clinically graded?

    <p>It is graded from very mild, with less than 25% surface area affected, to severe, where enamel is black, brittle, and chipped easily.</p> Signup and view all the answers

    What inherited condition is associated with abnormal dentine formation?

    <p>Dentinogenesis imperfecta, also known as hereditary brown opalescent dentine.</p> Signup and view all the answers

    What effects do brief versus prolonged environmental insults have on enamel hypoplasia?

    <p>A brief insult creates a narrow line of hypoplasia, while a prolonged insult results in a wider zone affecting more teeth.</p> Signup and view all the answers

    What is the role of systemic environmental factors in enamel hypoplasia?

    <p>Systemic environmental factors, such as mineral deficiencies, can lead to acquired generalized enamel hypoplasia.</p> Signup and view all the answers

    What is the main distinction between hereditary enamel hypoplasia and hereditary enamel hypocalcification?

    <p>Hereditary enamel hypoplasia is a quantitative defect with deficient enamel matrix, while hypocalcification is a qualitative defect with normal matrix but defective mineralization.</p> Signup and view all the answers

    Describe the surface texture and luster of enamel in cases of hereditary enamel hypocalcification.

    <p>Enamel in hereditary enamel hypocalcification has a rough surface texture and lacks surface luster, appearing dull.</p> Signup and view all the answers

    What causes localized enamel hypoplasia known as 'Turner's tooth'?

    <p>Turner's tooth is caused by trauma or localized infection during the formation of the affected teeth.</p> Signup and view all the answers

    Explain how hereditary enamel hypoplasia affects the size and quality of the teeth.

    <p>It results in smaller teeth with insufficient amounts of hard, smooth, and translucent enamel.</p> Signup and view all the answers

    What are the radiographic characteristics of enamel in hereditary enamel hypoplasia?

    <p>The enamel in hereditary enamel hypoplasia appears with normal radiopacity.</p> Signup and view all the answers

    What impact does hereditary enamel hypocalcification have on the appearance and durability of teeth?

    <p>Teeth may appear dull, vary in color from white opaque to yellow-brown, and exhibit soft and friable enamel that fractures easily.</p> Signup and view all the answers

    How does the mineralization process differ in hereditary enamel hypoplasia versus hereditary enamel hypocalcification?

    <p>Hereditary enamel hypoplasia has normal mineralization while hereditary enamel hypocalcification has defective mineralization.</p> Signup and view all the answers

    Identify the key features that differentiate acquired enamel hypoplasia from hereditary enamel defects.

    <p>Acquired enamel hypoplasia typically affects only the permanent teeth and is often localized, unlike hereditary defects which may affect both dentitions.</p> Signup and view all the answers

    What is the histological characteristic of the dentinal tubules in shell teeth?

    <p>The dentinal tubules in shell teeth are fewer in number, widely spaced, larger in diameter, and irregular.</p> Signup and view all the answers

    How is the pulp chamber affected in shell teeth?

    <p>The pulp chamber in shell teeth is not obliterated, and the pulp itself is very wide with coarse fibrous connective tissue.</p> Signup and view all the answers

    What is a notable radiographic feature of shell teeth?

    <p>A notable radiographic feature of shell teeth is the presence of small bulbous crowns and short, narrow root canals.</p> Signup and view all the answers

    Describe the typical clinical appearance of shell teeth.

    <p>Shell teeth typically appear bluish-gray to brown with bulbous crowns, and the crowns are slightly smaller than normal.</p> Signup and view all the answers

    Total __________ is the absence of all teeth.

    <p>anodontia</p> Signup and view all the answers

    Hypodontia refers to the partial absence of a __________ or a group of teeth.

    <p>tooth</p> Signup and view all the answers

    Hereditary ectodermal dysplasia can lead to __________ anodontia.

    <p>total</p> Signup and view all the answers

    Dens invaginatus is one type of abnormality in __________.

    <p>shape</p> Signup and view all the answers

    Microdontia is characterized by teeth that are smaller than __________.

    <p>normal</p> Signup and view all the answers

    A common feature of hereditary ectodermal dysplasia is the __________ of sweat glands.

    <p>absence</p> Signup and view all the answers

    The condition known as __________ is when clinically absent teeth still fail to erupt.

    <p>pseudo anodontia</p> Signup and view all the answers

    __________ refers to an increase in the number of teeth, such as hyperdontia.

    <p>Supernumerary teeth</p> Signup and view all the answers

    In taurodontism, the bifurcation or trifurcation occurs near the ______ of the roots.

    <p>apices</p> Signup and view all the answers

    An enamel pearl, also known as enameloma, is typically found on the root surface near the ______ area.

    <p>bifurcation</p> Signup and view all the answers

    Dens invaginatus is caused by the invagination of all layers of the ______ organ.

    <p>enamel</p> Signup and view all the answers

    Supernumerary roots are most commonly seen in mandibular ______, canines, and molars.

    <p>premolars</p> Signup and view all the answers

    In taurodontism, the pulp chamber is extremely large with a much greater ______ height than normal.

    <p>apico-occlusal</p> Signup and view all the answers

    The term taurodontism literally means '______-like' teeth.

    <p>bull</p> Signup and view all the answers

    Enamel pearls may consist of enamel only or enamel, dentine, and ______.

    <p>pulp</p> Signup and view all the answers

    The condition known as dens invaginatus results in the formation of an enamel-lined cavity that communicates with the ______.

    <p>surface</p> Signup and view all the answers

    The crowns of shell teeth have a ______ appearance due to their small size and constricted neck.

    <p>bulbous</p> Signup and view all the answers

    In shell teeth, the dentinal tubules are fewer in number, widely spaced, and ______ in diameter than normal.

    <p>larger</p> Signup and view all the answers

    Shell teeth are clinically similar to dentinogenesis imperfecta except that the ______ chamber is not obliterated.

    <p>pulp</p> Signup and view all the answers

    A common histological feature of shell teeth is the presence of numerous ______ in the pulp.

    <p>pulp stones</p> Signup and view all the answers

    In shell teeth, the roots are described as being extremely ______.

    <p>short</p> Signup and view all the answers

    Hereditary structural anomalies usually affect both the deciduous and permanent ______.

    <p>dentitions</p> Signup and view all the answers

    Acquired (environmental) factors usually affect only one dentition, typically the ______.

    <p>permanent</p> Signup and view all the answers

    Hereditary anomalies usually affect either ______ or dentine.

    <p>enamel</p> Signup and view all the answers

    Acquired (environmental) factors tend to affect both ______ and dentine.

    <p>enamel</p> Signup and view all the answers

    Amelogenesis imperfecta is a hereditary familial disorder of enamel formation affecting both the primary and permanent ______.

    <p>dentitions</p> Signup and view all the answers

    Hereditary enamel hypoplasia is one type of ______ imperfecta.

    <p>amelogenesis</p> Signup and view all the answers

    Acquired factors can be categorized into local and ______ factors.

    <p>systemic</p> Signup and view all the answers

    Systemic factors leading to enamel defects may include nutritional deficiencies, fevers, and hormonal ______.

    <p>disturbances</p> Signup and view all the answers

    Dens in dente may appear as either a normally shaped or malformed crown that exhibits a deep pit in the area of the ______.

    <p>cingulum</p> Signup and view all the answers

    Dens evaginatus appears as an accessory cusp on the occlusal surface between the buccal and ______ cusps of premolars.

    <p>lingual</p> Signup and view all the answers

    The venereal disease caused by the spirochetes 'treponema pallidum' is known as ______.

    <p>syphilis</p> Signup and view all the answers

    Children born to syphilitic mothers may show characteristic abnormalities in the size, shape, and structure of their permanent ______.

    <p>teeth</p> Signup and view all the answers

    Hutchinson's teeth are described as barrel-shaped with tapering mesial and distal surfaces giving a ______ appearance.

    <p>screw-driver</p> Signup and view all the answers

    Moon's molars exhibit a constricted occlusal surface and a ______ shape.

    <p>dome</p> Signup and view all the answers

    Developmental disturbances that may affect the structure of teeth can be hereditary or ______.

    <p>acquired</p> Signup and view all the answers

    A ______ horn may extend into the extra cusp seen in dens evaginatus.

    <p>pulp</p> Signup and view all the answers

    Lack of sebaceous glands results in dry ______.

    <p>skin</p> Signup and view all the answers

    Total or partial anodontia of both ______ is a common oral manifestation.

    <p>dentitions</p> Signup and view all the answers

    The alveolar process is deficient in ______.

    <p>height</p> Signup and view all the answers

    The most common congenitally absent permanent teeth are the third ______.

    <p>molars</p> Signup and view all the answers

    Supernumerary teeth are extra teeth that do not morphologically resemble any of the adjacent normal ______.

    <p>teeth</p> Signup and view all the answers

    Predeciduous dentition is a very rare condition due to accessory buds formed before the enamel organ of the deciduous ______.

    <p>teeth</p> Signup and view all the answers

    Salivary glands hypoplasia with ______ is sometimes seen.

    <p>xerostomia</p> Signup and view all the answers

    The absence of upper lateral incisor may be associated with ______ palate.

    <p>cleft</p> Signup and view all the answers

    Match the features of shell teeth with their descriptions:

    <p>Crowns = Small bulbous crowns and bluish-gray to brown color Roots = Extremely short roots Pulp chamber = Not obliterated with coarse fibrous connective tissue Dentinal tubules = Fewer in number, widely spaced, and larger in diameter</p> Signup and view all the answers

    Match the histological features of shell teeth with their characteristics:

    <p>Enamel = Normal Mantle dentine = Peripheral layer normal Odontoblastic layer = Absent Pulp stones = Numerous pulp stones present</p> Signup and view all the answers

    Match the clinical presentations of shell teeth with their potential sequelae:

    <p>Caries = Early pulp exposure common Color variance = Bluish-gray to brown hues Pulp condition = Wider than normal pulp with irregularities Root structure = Short with narrow canals</p> Signup and view all the answers

    Match the abnormalities in shell teeth with their implications:

    <p>Pulp chamber obliteration = Not present Dentine thickness = Thin dentine forming a shell Crown appearance = Bulbous with smaller proportions Radiographic feature = Partial obliteration of pulp chambers</p> Signup and view all the answers

    Match the terms associated with shell teeth to their definitions:

    <p>Shell teeth = Rare dental abnormality similar to dentinogenesis imperfecta Dentinogenesis imperfecta = Condition where dentine is poorly formed Pulpage exposure = Outcome of caries affecting shell teeth Interglobular spaces = Large areas due to poorly calcified dentine</p> Signup and view all the answers

    Match the dental conditions with their corresponding descriptions:

    <p>Gemination = Partial division of a single tooth germ resulting in two crowns Fusion = Union of two adjacent tooth germs reducing tooth count Concrescence = Joining of teeth along the roots after root formation Dilaceration = Angulation or sharp bend along the long axis of a tooth</p> Signup and view all the answers

    Match the dental anomalies with their features:

    <p>Macrodontia = Normal-sized teeth appearing large in small jaws Microdontia = Condition where teeth are smaller than normal Talon Cusp = Extra cusp resembling an eagle's talon Concrescence = Teeth joined by cementum after root development</p> Signup and view all the answers

    Match the dental issues with their causes or characteristics:

    <p>Gemination = Affects deciduous and permanent teeth, normal count Fusion = Can be complete or incomplete based on development stage Concrescence = Caused by trauma or crowding of teeth Dilaceration = Related to trauma during root development</p> Signup and view all the answers

    Match the following terms with their definitions in dental anatomy:

    <p>Macrodontia = Teeth appear larger due to small jaw size Microdontia = Condition associated with smaller than normal teeth Talon Cusp = An extra cusp development in a tooth Dilaceration = Bending or angulation of the tooth axis</p> Signup and view all the answers

    Match the condition with its effect on tooth count:

    <p>Gemination = Normal tooth count Fusion = Reduced tooth count by one Concrescence = Does not affect overall tooth count Dilaceration = Does not alter the number of teeth present</p> Signup and view all the answers

    Match the conditions with their primary developmental influences:

    <p>Gemination = Inherited or genetic factors Fusion = Trauma and crowding during development Concrescence = Post-root formation trauma Dilaceration = Trauma during root growth</p> Signup and view all the answers

    Match the concept with the corresponding feature:

    <p>Gemination = Two crowns with a single root Fusion = Two adjacent teeth merging into one Concrescence = Roots fused by cementum post-development Dilaceration = Bending occurring at various tooth levels</p> Signup and view all the answers

    Match the dental conditions with their specific locations or demographics:

    <p>Gemination = Common in maxillary incisor region Fusion = Can occur at any stage of tooth development Concrescence = Typically found after root development Dilaceration = May occur along any length of tooth</p> Signup and view all the answers

    Match the type of enamel defect with its description:

    <p>Hereditary enamel hypoplasia = Defect involving underdeveloped enamel Hereditary enamel hypo-calcification = Defect involving poorly mineralized enamel Acquired enamel hypoplasia = Defect resulting from environmental factors Amelogenesis imperfecta = Hereditary disorder affecting enamel formation</p> Signup and view all the answers

    Match the factor with its classification in enamel defects:

    <p>Trauma = Local acquired factor Nutritional deficiencies = Systemic acquired factor Congenital syphilis = Systemic acquired factor Amelogenesis imperfecta = Hereditary factor</p> Signup and view all the answers

    Match the criteria with hereditary or acquired defects:

    <p>Affects enamel or dentine = Hereditary defects Usually affects all teeth = Hereditary defects Affects both enamel and dentine = Acquired defects Produces horizontally oriented pits = Acquired defects</p> Signup and view all the answers

    Match the enamel defect type with the teeth it affects:

    <p>Hereditary enamel hypoplasia = Affects both primary and permanent teeth Acquired enamel defects = May affect only one dentition Amelogenesis imperfecta = Affects both dentitions Environmental enamel hypoplasia = Affects usually permanent teeth</p> Signup and view all the answers

    Match the systemic factor with its potential impact on enamel formation:

    <p>Fevers = May cause enamel hypoplasia Calcium deficiency = Affects mineralization of enamel Hormonal disturbances = May impact enamel quality Irradiation = Can lead to local enamel defects</p> Signup and view all the answers

    Match the enamel defect characteristics with their descriptions:

    <p>Diffuse defects = Typical of hereditary anomalies Vertically oriented pits = Common in hereditary enamel defects Horizontally oriented defects = Characteristic of acquired factors Single or grouped teeth affected = Typical of acquired factors</p> Signup and view all the answers

    Match the term with its related defect:

    <p>Amelogenesis imperfecta = Involves hereditary defects Local factors = Examples include trauma and infection Systemic factors = Includes nutritional deficiencies and fevers Enamel hypoplasia = Affects enamel development</p> Signup and view all the answers

    Match the enamel defect type with its occurrence:

    <p>Hereditary factors = Affect both dentitions Acquired environmental factors = Affects usually one dentition Hereditary enamel hypo-calcification = Involves mineralization issues Acquired enamel defects = Result from environmental stressors</p> Signup and view all the answers

    Match the following abnormalities in the number of teeth with their descriptions:

    <p>Total anodontia = Absence of all teeth Partial anodontia = Absence of a single tooth or a group of teeth True anodontia = Ab absent teeth fail to develop Pseudo anodontia = Clinically absent teeth develop but fail to erupt</p> Signup and view all the answers

    Match the following conditions with their clinical features:

    <p>Hereditary Ectodermal Dysplasia = Total or partial absence of sweat glands Streeter's Syndrome = Thin, smooth, and dry skin Total anodontia = Rare condition associated with hereditary defects Pseudo anodontia = Embedded or impacted teeth that fail to erupt</p> Signup and view all the answers

    Match the following size abnormalities with their terms:

    <p>Microdontia = Abnormally small teeth Macrodontia = Abnormally large teeth Talon cusp = Additional cusp on the tooth Taurodontism = Enlarged pulp chamber and short roots</p> Signup and view all the answers

    Match the following shape abnormalities with their definitions:

    <p>Gemination = Incomplete splitting of a single tooth bud Fusion = Union of adjacent tooth buds Dilaceration = Abnormal curvature of the tooth Enamel pearl = Localized deposition of enamel on the root</p> Signup and view all the answers

    Match the following defects of enamel with their conditions:

    <p>Amelogenesis imperfecta = Hereditary enamel defect Acquired defects of enamel = Environmental factors affecting enamel Dentinogenesis imperfecta = Defect in dentin structure Regional odontodysplasia = Defects in both enamel and dentin</p> Signup and view all the answers

    Match the following eruption abnormalities with their characteristics:

    <p>Premature eruption = Eruption before the normal time Delayed eruption = Eruption after the normal time Embedded teeth = Teeth that fail to erupt completely Submerged teeth = Teeth that are positioned below the occlusal plane</p> Signup and view all the answers

    Match the following descriptions with the type of anodontia:

    <p>Total anodontia = Associated with hereditary ectodermal dysplasia Partial anodontia = Clinically missing teeth that do not develop True anodontia = Complete absence of dental development False anodontia = Loss of teeth post-extraction</p> Signup and view all the answers

    Match the following abnormalities with their types:

    <p>Hyperdontia = Increase in the number of teeth Hypodontia = Decrease in the number of teeth Supernumerary teeth = Extra teeth beyond the normal count Supplemental teeth = Additional teeth that resemble normal teeth</p> Signup and view all the answers

    Match the following dental conditions with their descriptions:

    <p>Total anodontia = Complete absence of teeth Partial anodontia = Failure of development of one or more permanent teeth Supernumerary teeth = Extra teeth beyond the normal count Hypodontia = Congenital absence of specific teeth</p> Signup and view all the answers

    Match the following types of dentition with their classifications:

    <p>Predeciduous dentition = Teeth present at birth Post-permanent dentition = Teeth formed after the permanent dentition Supernumerary teeth = Extra teeth not resembling adjacent teeth Supplemental teeth = Teeth resembling normal teeth but additional in number</p> Signup and view all the answers

    Match the following commonly congenitally absent teeth with their locations:

    <p>Maxillary lateral incisor = Often absent in hypodontia Mandibular second premolar = Commonly absent in partial anodontia Third molar = Most frequently absent permanent teeth Deciduous maxillary lateral incisor = Rarely absent but sometimes seen</p> Signup and view all the answers

    Match the following oral manifestations with their conditions:

    <p>High palate = Seen in total or partial anodontia Xerostomia = Due to salivary gland hypoplasia Deficient alveolar process = Associated with anodontia Cone-shaped teeth = Observed in dental defects</p> Signup and view all the answers

    Match the types of supernumerary teeth with their features:

    <p>Conical = Small and pointed additional teeth Erupted = Teeth that have emerged into the oral cavity Impacted = Teeth that are trapped beneath the gumline Multiple = Several extra teeth present at once</p> Signup and view all the answers

    Match the eitiological factors associated with dental conditions:

    <p>Hereditary tendency = Family history of dental anomalies Radiation Therapy = Can damage tooth germs during formation Ectodermal dysplasia = Genetic condition affecting tooth development Unknown etiology = Cause of many anodontia cases</p> Signup and view all the answers

    Match the following definitions with their dental terms:

    <p>Hypodontia = Absence of one or more teeth Supernumerary tooth = An extra tooth that does not resemble others Cone-shaped tooth = Tooth with a tapered shape Anodontia = Complete lack of teeth formation</p> Signup and view all the answers

    Match the following dental anomalies with their potential clinical features:

    <p>Xerostomia = Dry mouth due to salivary gland dysfunction Cleft palate = Opening in the roof of the mouth Retarded eruption = Delayed appearance of teeth High alveolar ridge = Insufficient height of the jawbone</p> Signup and view all the answers

    Match the following features with their respective dental conditions:

    <p>Taurodontism = Apically displaced bifurcation or trifurcation Dens invaginatus = Enamel-lined cavity communicating with the surface Enamel pearl = May consist of enamel only or enamel, dentine, and pulp Talon cusp = Composed of normal enamel and dentin with a pulp horn</p> Signup and view all the answers

    Match the following dental conditions with their primary features:

    <p>Supernumerary roots = Extra roots commonly seen in mandibular premolars Talon cusp = Projects from the cingulum area to the incisal edge Enamel pearl = Usually found on maxillary molars near bifurcation Taurodontism = Large pulp chamber with no cervical constriction</p> Signup and view all the answers

    Match the terms with their definitions:

    <p>Talon cusp = Lingual projection on an incisor tooth Enamel pearl = Small, spherical enamel projection on the root Taurodontism = Bull-like teeth with enlarged pulp chambers Dens invaginatus = Cavity formation caused by enamel organ invagination</p> Signup and view all the answers

    Match the dental terms with their clinical implications:

    <p>Taurodontism = No remarkable clinical morphological characteristics Supernumerary roots = Diagnosed primarily through radiography Dens invaginatus = May result in enamel-lined cavities Enamel pearl = Forms due to abnormal displacement of ameloblasts</p> Signup and view all the answers

    Match the dental condition with its classification:

    <p>Taurodontism = Variable form from mild to extreme Dens invaginatus = Linked to odontogenesis disruption Supernumerary roots = Most common in specific tooth types Enamel pearl = May contain various histological components</p> Signup and view all the answers

    Match the clinical features with their corresponding conditions:

    <p>Taurodontism = Large apico-occlusal height in pulp chamber Enamel pearl = Found near bifurcation on the root surface Dens invaginatus = Communicates with the tooth surface Talon cusp = Normal enamel composition found</p> Signup and view all the answers

    Match the following dental anomalies to their functions or origins:

    <p>Dens invaginatus = Caused by invagination during odontogenesis Enamel pearl = Results from epithelial root sheath differentiation Supernumerary roots = Often radiographically diagnosed Taurodontism = Results from failure of Hertwig's sheath to invaginate</p> Signup and view all the answers

    What color variations are typically seen in shell teeth?

    <p>Bluish-gray to brown</p> Signup and view all the answers

    Shell teeth have short roots that are extremely long in length.

    <p>False</p> Signup and view all the answers

    What histological abnormality is commonly associated with the pulp in shell teeth?

    <p>Absence of odontoblastic layer</p> Signup and view all the answers

    The dentinal tubules in shell teeth are fewer in number and have a larger diameter than normal, making them _____.

    <p>irregular</p> Signup and view all the answers

    Match the following features with their characteristics related to shell teeth:

    <p>Teeth color = Bluish-gray to brown Crown appearance = Small and bulbous Root length = Extremely short Pulp chamber = Widely opened and not obliterated</p> Signup and view all the answers

    What term describes the absence of all teeth?

    <p>Anodontia</p> Signup and view all the answers

    True or False: Partial anodontia refers to the absence of a single tooth or a group of teeth.

    <p>True</p> Signup and view all the answers

    What hereditary condition is associated with total anodontia?

    <p>Hereditary ectodermal dysplasia</p> Signup and view all the answers

    The dental condition characterized by the presence of additional teeth, such as supernumerary teeth, is known as _____

    <p>hyperdontia</p> Signup and view all the answers

    Match the following terms to their definitions:

    <p>Hypodontia = Absence of some teeth Anodontia = Absence of all teeth Supernumerary teeth = Extra teeth beyond the normal count Macrodontia = Teeth larger than normal</p> Signup and view all the answers

    Which of the following options are associated with abnormalities in tooth shape? (Select all that apply)

    <p>Gemination</p> Signup and view all the answers

    What is the term for teeth that are embedded or impacted?

    <p>Pseudo anodontia</p> Signup and view all the answers

    True or False: Total anodontia is common and frequently occurs without hereditary conditions.

    <p>False</p> Signup and view all the answers

    Which type of supernumerary tooth is located distal to the third molar?

    <p>Distomolar</p> Signup and view all the answers

    Supplemental teeth usually possess a morphology that is similar to the adjoining teeth.

    <p>True</p> Signup and view all the answers

    What is the hereditary disease characterized by deficient growth of bones like the cranial vault and clavicles?

    <p>Cleidocranial Dysplasia</p> Signup and view all the answers

    Microdontia refers to teeth that are __________ than normal size.

    <p>smaller</p> Signup and view all the answers

    Match the following terms related to abnormalities in the size of teeth:

    <p>Microdontia = Abnormal small teeth Macrodontia = Abnormal large teeth Localized microdontia = Involves a single or group of affected teeth Generalized macrodontia = All teeth larger than normal</p> Signup and view all the answers

    What may develop in relation to unerupted supernumerary teeth?

    <p>Dentigerous cysts</p> Signup and view all the answers

    Generalized microdontia includes normal-sized teeth appearing small due to large jaws.

    <p>False</p> Signup and view all the answers

    Which is a common site for supplemental teeth?

    <p>Maxillary lateral incisors</p> Signup and view all the answers

    What is gemination characterized by?

    <p>Partial division of a single tooth germ</p> Signup and view all the answers

    What condition is characterized by a sharp bend along the long axis of a tooth?

    <p>Dilaceration</p> Signup and view all the answers

    Fusion can result in a reduction of the total number of teeth by one, except in the case of a __________ tooth germ.

    <p>supernumerary</p> Signup and view all the answers

    Which type of abnormality involves the union of two adjacent tooth germs?

    <p>Fusion</p> Signup and view all the answers

    Match the dental abnormalities with their characteristics:

    <p>Gemination = Partial division of a tooth germ Fusion = Union of two adjacent tooth germs Concrescence = Joining of teeth along their roots Talon Cusp = Extra cusp resembling an eagle's talon</p> Signup and view all the answers

    Microdontia results in teeth that are larger than normal.

    <p>False</p> Signup and view all the answers

    Describe the appearance of a talon cusp.

    <p>It resembles an eagle's talon.</p> Signup and view all the answers

    Which characteristic differentiates hereditary enamel hypoplasia from hereditary enamel hypocalcification?

    <p>Defective mineralization</p> Signup and view all the answers

    In hereditary enamel hypocalcification, the enamel is hard and smooth.

    <p>False</p> Signup and view all the answers

    What is the common appearance of teeth affected by hereditary enamel hypoplasia?

    <p>Translucent and small</p> Signup and view all the answers

    In cases of acquired enamel hypoplasia, traumatic injuries usually affect the upper deciduous _________.

    <p>incisors</p> Signup and view all the answers

    Match the following features with their corresponding enamel defect:

    <p>Hardness = Hypocalcification Translucency = Hypoplasia Surface texture = Hypocalcification Luster = Hypoplasia</p> Signup and view all the answers

    Which of the following statements about acquired enamel hypoplasia is true?

    <p>It can occur as a result of trauma to developing teeth</p> Signup and view all the answers

    Hereditary enamel hypoplasia is characterized by a defect in the mineralization of the enamel.

    <p>False</p> Signup and view all the answers

    How does periapical infection in a deciduous tooth lead to enamel hypoplasia?

    <p>Infection can affect the underlying developing tooth germ, leading to enamel hypoplasia of the succeeding permanent tooth.</p> Signup and view all the answers

    What is a defining characteristic of taurodontism?

    <p>Apically displaced bifurcation or trifurcation</p> Signup and view all the answers

    Supernumerary roots are most commonly found in maxillary canines.

    <p>False</p> Signup and view all the answers

    What condition is characterized by an enamel-lined cavity caused by invagination of the enamel organ?

    <p>Dens invaginatus</p> Signup and view all the answers

    An enamel pearl is often found on the root surface near the ______ area.

    <p>bifurcation</p> Signup and view all the answers

    Match the dental conditions with their descriptions:

    <p>Taurodontism = Enlargement of the pulp chamber with short roots Dens invaginatus = Invagination of the enamel organ Enamel pearl = Spherical projection found on root surfaces Supernumerary roots = Extra roots commonly seen in certain teeth</p> Signup and view all the answers

    Which of the following teeth types are typically affected by supernumerary roots?

    <p>Mandibular premolars</p> Signup and view all the answers

    In taurodontism, the pulp chamber typically lacks anatomical constriction.

    <p>True</p> Signup and view all the answers

    What is the common radiographic feature of taurodontism?

    <p>An extremely large pulp chamber</p> Signup and view all the answers

    Study Notes

    Developmental Disturbances of Teeth: Classification

    • Number Abnormalities (defective initiation): Variations in the number of teeth, either fewer (hypodontia/anodontia) or more (hyperdontia).

      • Hypodontia/Anodontia: Absence of one or more teeth
        • Can be total (absence of all teeth) or partial (absence of some teeth)
        • Often associated with hereditary ectodermal dysplasias. Can also occur in isolation.
        • True anodontia = Teeth fail to develop
        • Pseudoanodontia = Teeth develop but fail to erupt (embedded or impacted).
        • False anodontia = Occurs as the result of tooth loss.
        • Total absence of all teeth is exceedingly rare.
        • It usually occurs in association with hereditary ectodermal dysplasia ("Streeter's Syndrome").
        • May be associated with cleft palate.
        • May result from radiation therapy during tooth formation.
      • Hyperdontia: Presence of more teeth than normal
        • Includes pre-deciduous, post-permanent, and supernumerary teeth
        • Associated with cleft palate, radiation treatment, familial incidence

    • Size Abnormalities (defective proliferation): Variations in tooth size.

      • Microdontia: Teeth smaller than normal. Localized or generalized; may affect tooth size relatively in relation to other structures (relative microdontia). Common affected teeth include maxillary lateral incisors and third molars.
        • May be generalized (all teeth are smaller than normal) or localized (a single or group of teeth is smaller)
        • Normal-sized teeth can appear small in large jaws (relatively generalized).
      • Macrodontia: Teeth larger than normal. Localized or generalized; may affect tooth size relatively in relation to other structures (relative macrodontia). Common affected teeth include maxillary central incisors, canines and third molars.
        • May be generalized (all teeth are larger than normal) or localized (a single or group of teeth is larger).

    • Shape Abnormalities (morpho-differentiation): Variations in tooth shape.

      • Gemination: A single tooth germ divides into two or more, resulting in multiple crowns
        • May be completely or incompletely separated crowns.
      • Fusion: Two or more adjacent tooth germs fuse to form one tooth
        • Fusion may be complete or incomplete, affecting either the crowns or roots or both.
        • May be related to trauma, heredity, or crowding.
      • Concrescence: Fusion of tooth roots after crown formation is complete.
        • Roots fused together but with separate crowns
      • Dilaceration: A sharp bend or curve in the tooth's long axis
        • Caused by trauma during root development.
      • Talon Cusp: An extra cusp resembling an eagle's talon. (Usually on mandibular incisors)
      • Taurodontism: Elongated tooth with the pulp chamber extending towards the apex.
      • Dens Invaginatus: A portion of the enamel invaginates into the crown's pulp. (Dens in dente)
        • Involves enamel invaginating into the tooth's crown.
      • Enamel pearl: A small, spherical enamel projection on a tooth's root. Usually found on maxillary molars.
        • Small, spherical protrusion of enamel located on tooth root near the bifurcation.

    • Structure Abnormalities (defective apposition and calcification): Variations in the tooth structure.

      • Defects of enamel: Disorders in enamel formation.
        • Hereditary: (eg., amelogenesis imperfecta)
        • Acquired (from local or systemic factors, eg. trauma, infection, or nutritional deficiencies)
      • Defects of dentin: Disorders in dentin formation.
        • Dentinogenesis imperfecta
      • Defects of enamel and dentin: Combined defects.
        • Regional odontodysplasia
        • Enamel hypoplasia/Hypocalcification (permanent teeth, except for cases of endemic fluorosis)

    Tooth Eruption Abnormalities (defective eruption):

    • Premature eruption: Teeth erupt earlier than normal
    • Delayed eruption: Teeth erupt later than normal
    • Embedded/Impacted teeth: Teeth remain trapped within the jawbone
    • Submerged teeth: Teeth erupt but are covered by the gum

    Additional Teeth:

    • Predeciduous
    • Post-permanent
    • Supernumerary

    Supplemental Teeth:

    • Occur before the permanent teeth
    • Small in size
    • Usually in the mandibular incisor area
    • May be seen before the formation of the enamel organ

    Other Abnormal Tooth Types:

    • Cleidocranial Dysplasia: Rare hereditary condition, characterized by skeletal abnormalities such as delayed or missing bone development and failure to close the skull sutures.
    • Total Anodontia: Complete absence of all teeth
    • Partial Anodontia: Absence of some teeth
    • Additional classification of additional teeth includes Predeciduous teeth, Post-permanent dentition and Supernumerary teeth
    • Cleidocranial dysostosis: Genetic condition characterized by delayed or missing bone development, including in the skull and collarbone (clavicle). Delayed tooth development is one manifestation, not the defining one.
    • Anodontia: Total anodontia is rare and often accompanies ectodermal dysplasia
    • Congenital syphilis (Prenatal syphilis): Infection of the fetus during pregnancy that can affect tooth development in children.

    Oral Manifestations

    • Some of the common oral manifestations include abnormal, cone-shaped or retarded teeth in eruption; high or cleft palate; underdevelopment of salivary glands; and deficiencies in alveolar process height.

    Tooth Size Abnormalities (Microdontia/Macrodontia)

    • Microdontia: All/Localized, Generalized/Relative. Common affected teeth include maxillary lateral incisors and third molars, affects one single tooth (eg., peg lateral incisors). May be due to hereditary/systemic factors.
    • Macrodontia: All/Localized, Generalized/Relative. Common affected teeth include maxillary central incisors, canines and third molars. May also affect multiple teeth or just one tooth. May be due to hereditary/systemic factors.

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    Dental Anomalies PDF

    Description

    Explore the classification of developmental disturbances in teeth, including number, size, and shape abnormalities. Learn about conditions such as hypodontia, hyperdontia, microdontia, and more. This quiz will test your understanding of these dental anomalies and their implications.

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