Questions and Answers
What does the term 'Mesognathic' refer to?
A classification of facial profile in which the maxilla and mandible are in harmony.
What does the term 'Retrognathic' imply?
A classification where the mandible is positioned farther back than the maxilla.
What is indicated by the term 'Prognathic'?
A classification where the mandible is positioned farther forward than the maxilla.
What is Class I Occlusion?
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What characterizes Class II Occlusion (Division 1)?
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What defines Class II Occlusion (Division 2)?
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What is described by Class III Occlusion?
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What does 'Posterior Crossbite' refer to?
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Define 'Anterior Crossbite'.
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What is an 'Open Bite'?
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What is meant by 'Tongue Thrust'?
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What does 'Edge to Edge Occlusion' mean?
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What is 'End to End Occlusion'?
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Define 'Normal Overbite'.
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What is a 'Moderate Overbite'?
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What signifies 'Severe Overbite'?
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What is 'Overjet'?
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Define 'Underjet'.
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What does 'Infraversion' indicate?
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What is 'Labioversion'?
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Define 'Linguoversion'.
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What does 'Supraversion' refer to?
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What is 'Buccoversion'?
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What does 'Torsoversion' mean?
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Study Notes
Malocclusion Classification Terms
- Mesognathic: Characterized by a normal or straight profile where the jaws are aligned.
- Retrognathic: A condition in which the mandible is positioned behind the maxilla, often leading to an underbite.
- Prognathic: Refers to a condition where the mandible protrudes forward relative to the maxilla, resulting in an overbite.
Occlusion Classes
- Class I Occlusion: Normal occlusion where the first molars interdigitate properly, with a slight overbite.
- Class II Occlusion (Division 1): First molars are positioned further back; characterized by protruded maxillary incisors creating an overbite.
- Class II Occlusion (Division 2): Similar molar positioning as Division 1 but with retroclined maxillary incisors and a deep overbite.
- Class III Occlusion: First molars are positioned more towards the front, often described as having an underbite.
Types of Crossbites
- Posterior Crossbite: Occurs when the posterior teeth are positioned buccal or lingual to their normal occlusion.
- Anterior Crossbite: Maxillary anterior teeth are positioned lingually to the mandibular anterior teeth, disrupting normal bite.
Bite Types
- Open Bite: There is no contact between maxillary anterior teeth and mandibular teeth, with no overlap.
- Edge to Edge Occlusion: Maxillary and mandibular anterior teeth meet at their incisal edges, rather than overlapping.
- End to End Occlusion: Cusp tips of maxillary teeth touch the cusp tips of mandibular teeth.
Overbite Measurement
- Normal Overbite: Maxillary incisor edges align within the incisal third of the mandibular incisors.
- Moderate Overbite: Incisor edges are located within the middle third of the mandibular teeth.
- Severe Overbite: Incisal edges extend into the cervical third of the facial surfaces of the mandibular teeth.
Overjet and Underjet
- Overjet: Horizontal distance between the labial surfaces of maxillary incisors and the incisal edges of mandibular incisors, measured using a periodontal probe.
- Underjet: Condition where maxillary incisors are located lingually to the mandibular incisors.
Tooth Positioning Terms
- Infraversion: Tooth is positioned below the established line of occlusion.
- Labioversion/Buccoversion: A tooth that has moved to a position labial or buccal to its normal alignment.
- Linguoversion: A tooth positioned lingual to the normal alignment.
- Supraversion: Elongation of a tooth above the occlusion line.
- Buccoversion: Similar to labio- and linguoversion, but specifically refers to a tooth positioned buccal to its normal location.
- Torsoversion: A tooth that is turned or rotated from its normal position.
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Description
Test your knowledge on the classification of malocclusion with these flashcards. This quiz covers important terms such as mesognathic, retrognathic, and various classes of occlusion. Perfect for dental students or professionals looking to refresh their understanding.