39 Questions
What is the term for the congenital absence of a single tooth germ or multiple tooth germs?
Oligodontia
What is the result of hyperactivity of the dental lamina?
Supernumerary teeth
Which teeth are most commonly found missing?
Upper lateral incisors, third molars, and lower second premolars
What is the term for an abnormally larger tooth?
Macrodontia
What causes the formation of supernumerary teeth?
Hyperactivity of the dental lamina
What is the term for the congenital absence of the entire dentition?
Anodontia
What is the term for an abnormally smaller tooth?
Microdontia
What is the stage of tooth development during which gemination and fusion occur?
Cap stage
What is the term for the abnormal invagination of the enamel organ into the dental papilla?
Dens invaginatus
What is the result of the abnormal proliferation of inner enamel epithelium into the stellate reticulum?
Dens evaginatus
What is the consequence of occlusal wear or fracture of the cusp-like structure in dens evaginatus?
Pulp exposure
What type of antibiotic is responsible for tooth staining?
Tetracycline
During what stage of tooth development does dens evaginatus occur?
Bell stage
What is the consequence of ingesting tetracycline during the mineralization of enamel and dentin?
Tooth staining
What is the primary interaction responsible for the initiation of tooth development?
Epithelial-ectomesenchymal interaction
What is the result of lack of initiation in tooth development?
Anodontia
Which of the following teeth are most commonly absent?
Upper lateral incisors, third molars, and lower second premolars
What is the result of abnormal initiation in tooth development?
Formation of single or multiple supernumerary teeth
What is the stage of tooth development where the enamel organ formed undergoes proliferation?
Proliferation
What is the result of disturbance in proliferation during tooth development?
Effects on the developed tooth depending on the stage at which the disturbance occurs
What is the process where cells undergo structural and biochemical changes to prepare for their function?
Histodifferentiation
During the bell stage, what influences the adjacent cells of the dental papilla to differentiate into odontoblasts?
Inner enamel epithelium
What is the term used to describe the process of cells giving up some of their properties, such as the ability to proliferate?
Apposition
What is the result of vitamin A deficiency on ameloblasts?
They fail to differentiate properly
What is the term used to describe the process of ameloblasts forming the enamel matrix?
Reciprocal induction
What is the type of dentin formed when odontoblasts fail to differentiate properly?
Osteodentin
What determines the shape and form of the tooth?
Morphodifferentiation
What is established before the formation of the hard tissue?
Morphological form and shape of the tooth
What is the result of disturbances during morphodifferentiation?
All of the above
What is dilaceration?
Abnormal curvature in the root
What is apposition?
Deposition of the matrix of dental hard tissues
What is the term for disturbances involving the matrix formation?
Hypoplasia
What is the term for disturbances involving the calcification or mineralization of the matrix?
Hypocalcification
What can cause disturbances in the formation of enamel matrix?
Both genetic and environmental factors
What is the result of disturbances in the formation of enamel matrix?
Enamel hypoplasia
What is characterized by alternate periods of activity and rest?
Apposition
What gives the tooth its final shape?
Apposition
What is the term for the formation of supernumerary root?
Supernumerary root formation
What is the result of disturbance during morphodifferentiation in the root?
Formation of supernumerary root
Study Notes
Tooth Development Abnormalities
- Gemination: division of tooth germ, resulting in two teeth united at the crown or root
- Fusion: union of two adjacent tooth germs, forming a single tooth with two pulp chambers
- Dens Invaginatus: abnormal invagination of the enamel organ into the dental papilla, appearing as a tooth within a tooth
- Dens Evaginatus: abnormal proliferation of inner enamel epithelium into the stellate reticulum, forming a cusp-like elevation on the occlusal surface of premolars or molars
Tetracycline Staining
- Tetracycline is an antibiotic that binds to calcified tissues
- Ingestion during tooth development can cause discoloration of enamel and dentin, known as tetracycline staining
Tooth Development Stages
Initiation
- Depends on epithelial-ectomesenchymal interaction, forming the dental lamina
- Abnormal initiation can result in anodontia (absence of tooth) or supernumerary teeth
- Initiation abnormalities can also result in teeth developing at abnormal locations
Proliferation
- Enamel organ formed during initiation undergoes proliferation to give the crown its final size and shape
- Disturbances during proliferation affect the developed tooth, depending on the stage at which the disturbance occurs
Histodifferentiation
- Cells undergo structural and biochemical changes, preparing to carry out their function
- Inner enamel epithelium influences adjacent dental papilla cells to differentiate into odontoblasts and ameloblasts
- Vitamin A deficiency can disturb ameloblast differentiation, affecting odontoblasts and resulting in osteodentin formation
Morphodifferentiation
- Determines the morphological form and shape of the tooth
- Disturbances during morphodifferentiation affect the morphology of the crown or root, depending on the stage at which the disturbance occurs
Apposition
- Deposition of the matrix of dental hard tissues, characterized by alternate periods of activity and rest
- Disturbances during apposition can result in hypoplasia (disturbances in matrix formation) or hypocalcification (disturbances in calcification)
Anodontia and Oligodontia
- Anodontia: congenital absence of tooth germ of the entire dentition
- Oligodontia: absence of single tooth germ or multiple tooth germs
- Teeth commonly found missing are upper lateral incisors, third molars, and lower second premolars
Supernumerary Teeth
- Teeth present in addition to the normal number, due to hyperactivity of the dental lamina
- Most common supernumerary teeth are mesiodens (between two upper central incisors) and paramolars (by the side of the molars)
Macrodontia and Microdontia
- Macrodontia: abnormally larger tooth, due to abnormal proliferation of the tooth germ at the bud stage
- Microdontia: abnormally smaller tooth, due to abnormal proliferation of the tooth germ at the bud stage
This quiz covers the stages of tooth formation, histophysiology, and applied aspects of tooth development, including Anodontia and Oligodontia. It's designed to test your understanding of tooth development and oral biology. Take this quiz to assess your knowledge!
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