Questions and Answers
What is the synonym for Anodontia?
Anodontia Vera
True Anodontia involves the failure of tooth buds to develop.
True
Which condition involves a less developed tooth structure?
What is Total or Complete Anodontia?
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Match the following terms with their descriptions:
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Which condition involves multiple unerupted teeth?
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What are supernumerary teeth also known as?
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Ankylosis is a cause of tooth impaction.
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What is the most common impacted tooth?
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Class II impaction suggests that the space between the mandible and distal of the 2nd molar is less than the __________.
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Study Notes
Anodontia
- Also known as Anodontia Vera, it is characterized by the congenital absence of teeth.
- True Anodontia results from the failure of tooth buds to develop properly.
Alterations in Size
- Microdontia: Involves smaller than normal teeth, which may present as peg-shaped or due to hypoplasia (less enamel development).
- Macrodontia: Refers to abnormally large teeth, including conditions like megadontism and gigantism.
Types of Anodontia
- Total or Complete Anodontia: Complete absence of all teeth; often associated with Hereditary Ectodermal Dysplasia.
- True Partial Anodontia: Absence of one or more teeth due to absent tooth buds; may also be associated with Ectodermal Dysplasia.
- Pseudoanodontia: Multiple unerupted teeth due to impaction or delayed eruption, where teeth are formed but fail to erupt.
- Induced Anodontia: Results from the extraction or exfoliation of teeth.
Alterations in Number and Eruption
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Supernumerary Teeth: Also known as Hyperdontia; occurs when there is an excess number of teeth.
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Types:
- True supernumerary teeth possess normal anatomy.
- Accessory or rudimentary teeth do not have identifiable structures.
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Types:
- Mesiodens: The most common supernumerary tooth located between the maxillary central incisors; can cause diastema.
- Maxillary 4th Molar: The second most common type of supernumerary tooth.
- Impaction: Clinical absence of a tooth, often due to lack of space or eruptive force.
Etiology of Impaction
- Common causes include:
- Lack of space due to dental crowding.
- Rotational misalignment of tooth buds.
- Ankylosis (fusion of the tooth to bone).
- The 3rd molars and maxillary canines are most frequently impacted.
Classification of Impaction Positions
- Mesioangular: Tooth angling towards the front of the mouth.
- Distoangular: Tooth angling towards the back of the mouth.
- Horizontal: Tooth lying horizontally within the bone.
Symptoms of Impaction
- Pericoronitis: Inflammation of the gingiva covering the impacted tooth, commonly associated with impacted third molars.
Alterations in Shape and Form
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Crown Anomalies:
- Fusion: Occurs when two tooth buds are attached, resulting in a single fused crown.
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Description
This quiz covers the abnormalities of teeth, focusing on Anodontia, its synonyms, and other alterations in size like Microdontia. Explore the congenital absence of teeth and understand the implications of these dental conditions.
