Questions and Answers
What does normal occlusion look like?
The MB cusp of the maxillary first molar is aligned with the MB groove of the mandibular first molar, with alignment of the teeth, normal overbite, and overjet, and coincident maxillary and mandibular midlines.
What is the problem with Angle's classification?
It only describes malocclusion in terms of teeth and dental discrepancies, considering only the anteroposterior plane and not assessing skeletal discrepancies.
What are malocclusions?
A condition in which there is a departure from the normal relation of the teeth to other teeth in the same arch and/or to teeth in the opposing arch.
What are the 3 classifications of malocclusion?
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What does an intra-arch dental relationship look like?
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What is Class I malocclusion?
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What is Class II malocclusion?
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What are the 3 divisions of Class II malocclusion?
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What is Class III malocclusion?
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What can an anterior area sagittal relationship look like?
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What does a posterior crossbite look like?
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What is functional crossbite?
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What is vertical classification?
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What is an open bite?
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What is deep overbite?
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What is the cause of skeletal discrepancy?
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Study Notes
Normal Occlusion
- The mesiobuccal cusp of the maxillary first molar aligns with the mesiobuccal groove of the mandibular first molar.
- Features include normal overbite, normal overjet, and coincident midlines of maxillary and mandibular teeth.
Angle's Classification Limitations
- Angle's classification addresses malocclusion through tooth and dental discrepancies.
- It only considers the anteroposterior plane, neglecting potential skeletal discrepancies.
- Sole examination of first molar occlusion is insufficient for comprehensive assessment.
Malocclusion Definition
- A deviation from normal tooth relationships within the same arch or opposing arch.
- Can involve intra-arch (teeth) and inter-arch (jaw positions) relationships.
Classifications of Malocclusion
- Three primary classifications: intra-arch, inter-arch, and skeletal discrepancies.
Intra-arch Dental Relationships
- Characterized by crowding or spacing (mild, moderate, or severe) of teeth.
- May present high canines and various individual malpositions such as rotations or linguoversions.
Class I Malocclusion
- Defined by the mesiobuccal cusp of the upper first permanent molar occluding in the lower first molar's mesiobuccal groove.
- Anomalies include individual teeth issues like rotations, spacing, and crowding.
Class II Malocclusion
- Occurs when the mesiobuccal cusp of the upper first permanent molar occludes anterior to the lower first molar's mesiobuccal groove.
Divisions of Class II Malocclusion
- Division I: characterized by excess overjet and proclined incisors.
- Division II: features retroclined incisors and a deep overbite.
- Subdivision: involves malocclusion on only one side.
Class III Malocclusion
- Identified by the upper first permanent molar's mesiobuccal cusp occluding posterior to the lower first molar's mesiobuccal groove.
Anterior Area Sagittal Relationships
- Can present with a normal overjet, an anterior crossbite, or an excessive overjet.
Posterior Crossbite
- Defined by abnormal buccolingual relations of posterior teeth with antagonistic teeth.
- Can arise from malposition of teeth or skeletal factors; may be unilateral or bilateral.
Functional Crossbite
- Results from occlusal interference, necessitating lateral or anterior shifts of the mandible for occlusion.
Vertical Classification
- Involves vertical overlap measurements of upper and lower incisors at maximum intercuspation, typically about one-third of the lower incisors or 2-3 mm.
Open Bite
- Characterized by lack of vertical overlap between upper and lower teeth during maximum intercuspation.
Deep Overbite
- Excessive vertical overlap exists between the upper and lower incisors at maximum intercuspation.
Cause of Skeletal Discrepancy
- Skeletal discrepancies arise from the positional relationship between the maxilla and mandible.
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Description
This quiz covers the principles of normal occlusion, malocclusion definitions, and the limitations of Angle's classification. Explore the complexities of intra-arch and inter-arch dental relationships, and understand the various classifications of malocclusion. Perfect for dental students and practitioners.
