71 Questions
When does the permanent dentition begin to erupt?
6 years
Which type of teeth are formed in utero and are completed at around 3 years of age?
Primary teeth
At what age does the transition to mixed dentition occur?
6 years
Which numbering system starts with the upper right third molar and progresses to the upper left third molar for permanent teeth?
Universal
Which arch is referred to as the upper arch?
Maxillary
Which surface of a tooth is used for cutting in an anterior tooth?
Incisal
Which set of traits distinguish the four categories of teeth into their functional classes?
Arch traits
Which dentition phase is characterized by the presence of both primary and permanent teeth?
Mixed dentition
At what age does the exfoliation of the last primary tooth typically occur?
12 years
How many total teeth are present in the primary dentition?
20
Which numbering system starts with the upper right third molar and progresses to the upper left third molar for permanent teeth?
Palmer
Which of the following is the correct formula for the human dentition?
I 2/2 C 1/1 P 2/2 M 3/3
Which arch is referred to as the lower arch?
Mandibular arch
Which surface of a tooth is used for chewing in a posterior tooth?
Occlusal
At what age does the transition to mixed dentition occur?
6 years
Which dentition phase begins with the eruption of the first permanent teeth and ends with the exfoliation of the last primary tooth?
Mixed dentition
How many total teeth are present in the primary dentition?
20
Which numbering system starts with the upper right third molar and progresses to the upper left third molar for permanent teeth?
Palmer
Which surface of a tooth is used for cutting in an anterior tooth?
Incisal
Which dentition phase is characterized by the presence of both primary and permanent teeth?
Mixed dentition
At what age does the transition to mixed dentition occur?
6-7 years
Which surface of a tooth is responsible for preventing the lodging of food in the contact?
Proximal surface
What is the primary purpose of the marginal ridges?
To prevent lodging of food in the contact
Which ridge slopes downward from a cusp tip toward the center of the occlusal surface?
Triangular ridge
Which of the following is true about the chronology of the primary dentition?
Teeth begin developing in the jaws as early as six weeks in utero.
Which of the following is true about the eruption of primary teeth?
Eruption is a clinical marker for eruption.
Which of the following is true about the chronology of the permanent dentition?
Root formation is largely complete by 16 years of age.
Which of the following is true about the eruption of permanent teeth?
Lower incisors are the first to emerge.
Which of the following is true about the primary mandibular second molar compared to the permanent mandibular first molar?
The primary molar is wider buccolingually
Which cusps are almost equal in size and development in the primary mandibular second molar?
MB, DB, and DB
Which tooth has a distal root that is rounder, shorter, and more tapered?
Permanent mandibular first molar
Which tooth has a well-defined triangular ridge on the occlusal surface that terminates at the Central Developmental Groove (CDG)?
Primary Mandibular First Molar
Which tooth has a mesial outline that drops down from the marginal ridge to the cervix?
Primary Mandibular First Molar
Which tooth has a lingual cusp that is almost centered lingually and in line with the mesial root?
Primary Mandibular First Molar
Which tooth has a distal marginal ridge that is smaller and a distal root that is rounder and shorter?
Primary Mandibular First Molar
Which tooth in the primary dentition has a longer distal ridge slope compared to its mesial slope?
Primary Mandibular Canine
Which tooth in the primary dentition has the most prominent ML cusp?
Primary Maxillary Second Molar
Which tooth in the primary dentition has a narrower crown distally compared to mesially?
Primary Maxillary Second Molar
Which tooth in the primary dentition resembles a premolar and has a well-defined buccal developmental groove between two buccal cusps?
Primary Mandibular Canine
Which of the following is the correct formula for estimating the timing of enamel hypoplasia?
ADF = ACF ( years of formation / crown height x distance of defect from CEJ)
Which of the following is true about developmental anomalies in dental roots?
All of the above.
Which of the following is NOT a function of the dental pulp?
Identifying abnormalities in tooth development
Which of the following is true about the primary dentition?
The primary dentition plays a role in the development of occlusion in the permanent dentition.
Which of the following is true about the pulp chambers and pulp canals of primary teeth?
The roots of primary molars flare out nearer the crown than in permanent molars.
Which of the following is true about the primary maxillary central incisor?
The crown is wider than it is tall.
Which of the following is true about the primary mandibular canine?
The tooth tapers lingually and is usually distally inclined above the middle third.
Which tooth in the primary dentition has the most prominent ML cusp?
Primary mandibular second molar
Which tooth in the primary dentition has a narrower crown distally compared to mesially?
Primary mandibular canine
Which tooth has a distal root that is rounder, shorter, and more tapered?
Primary maxillary central incisor
Which of the following is true about the dental pulp?
The dental pulp is a connective tissue organ that contains artery, veins, lymphatic tissue, and nerves.
Which of the following is true about the cementoenamel junction (CEJ)?
The CEJ is the point where the enamel overlaps the cementum.
Which of the following formulas is used to estimate the timing of enamel hypoplasia?
ADF = ACF ( years of formation / crown height x distance of defect from CEJ)
Which tooth in the primary dentition has a well-defined buccal developmental groove between two buccal cusps?
Primary mandibular first molar
Which tooth in the primary dentition has the most prominent ML cusp?
Primary mandibular first molar
Which tooth has a distal marginal ridge that is smaller and a distal root that is rounder and shorter?
Primary mandibular second molar
Which tooth in the primary dentition has a longer distal ridge slope compared to its mesial slope?
Primary maxillary first molar
Which tooth in the primary dentition has the smallest crown width at the cervix compared to its MD measurement?
Primary Maxillary First Molar
Which tooth in the primary dentition has a longer distal ridge slope compared to its mesial slope?
Primary Maxillary First Molar
Which tooth in the primary dentition has a distal root that is shorter and narrower compared to the other roots?
Primary Maxillary Second Molar
Which tooth in the primary dentition has a lingual cusp that is the largest and most well-developed?
Primary Maxillary Second Molar
Which of the following is true about the primary maxillary central incisor?
The crown is wider than it is tall.
Which of the following is true about the primary maxillary lateral incisor?
The root is longer in proportion compared to the central incisor.
Which of the following is true about the primary mandibular central incisor?
The crown is narrow in proportion to length compared to permanent incisors.
Which of the following is true about the primary mandibular lateral incisor?
The lingual surface is narrower than the facial surface.
Which of the following is NOT a property of an ideal gypsum product for dental purposes?
High flexibility
What is the main purpose of gypsum in dental applications?
Production of dental prostheses
Which material is typically used to make a model in dental applications?
Plaster
What effect does the water-to-powder ratio have on the properties of the mixed material in dental impressions?
It alters the consistency and setting times
Which of the following is true about primary teeth?
Primary teeth have a wider mesio-distal dimension than their cervico-incisal dimension.
Which of the following is NOT a requirement for impression materials?
Dimensionally stable long enough.
Which of the following is true about the working and setting time of impression materials?
The setting time is the time elapsed from the beginning of mixing until the material has enough strength to be removed from the mouth without distortion.
Study Notes
Dental Development and Dentition
- The permanent dentition begins to erupt around 6 years of age.
- Primary teeth, also known as deciduous teeth, are formed in utero and are completed around 3 years of age.
- The transition to mixed dentition occurs between 6-12 years of age.
- The Universal Numbering System starts with the upper right third molar and progresses to the upper left third molar for permanent teeth.
- The upper arch is referred to as the maxilla, and the lower arch is referred to as the mandible.
Tooth Structure and Function
- The incisal edge is the surface of a tooth used for cutting in an anterior tooth.
- The occlusal surface is the surface of a tooth used for chewing in a posterior tooth.
- The contact point is the surface of a tooth responsible for preventing the lodging of food.
- Marginal ridges serve to prevent the lodging of food in the contact point.
Primary Dentition
- There are 20 teeth in the primary dentition.
- The primary dentition phase begins at birth and ends with the exfoliation of the last primary tooth around 12-14 years old.
- The primary maxillary central incisor is the first tooth to erupt, and the primary mandibular second molar is the last tooth to erupt.
Tooth Characteristics
- The primary mandibular second molar has almost equal-sized cusps.
- The primary maxillary first molar has a triangular ridge on the occlusal surface that terminates at the Central Developmental Groove (CDG).
- The primary maxillary lateral incisor has a distal root that is rounder, shorter, and more tapered.
- The primary mandibular canine has a lingual cusp that is almost centered lingually and in line with the mesial root.
Developmental Anomalies and Pulp
- The formula for estimating the timing of enamel hypoplasia is: Age (in years) = Crown height (mm) / 3.6 + 1.6.
- Developmental anomalies in dental roots can occur due to genetic or environmental factors.
- The dental pulp's primary function is to produce dentin and respond to stimuli.
- The cementoenamel junction (CEJ) is the boundary between enamel and cementum on the root surface.
Test your knowledge of dental anatomy with this quiz on nomenclature and morphology. Learn about primary, transitional, and permanent teeth as you explore the formation and characteristics of each dentition. Perfect for dental students and enthusiasts alike.
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