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Questions and Answers
What is the key tooth in Angle's classification for malocclusion?
What is the key tooth in Angle's classification for malocclusion?
Mesiobuccal cusp of permanent maxillary 1st molar
In normal occlusion, the mesiobuccal cusp of the maxillary first permanent molar occludes with what structure?
In normal occlusion, the mesiobuccal cusp of the maxillary first permanent molar occludes with what structure?
Buccal groove of mandibular first molar
What is the only class of malocclusion with intra arch malocclusion?
What is the only class of malocclusion with intra arch malocclusion?
Class I
The zygoma or key ridge corresponds to which part?
The zygoma or key ridge corresponds to which part?
What is key ridge?
What is key ridge?
In deciduous dentition, zygoma corresponds to which tooth?
In deciduous dentition, zygoma corresponds to which tooth?
The mesiobuccal cusp transmits force to which structure?
The mesiobuccal cusp transmits force to which structure?
In Angle's class I, where is the mesiobuccal cusp of the upper first molar aligned?
In Angle's class I, where is the mesiobuccal cusp of the upper first molar aligned?
In Angle's class II, where is the distobuccal cusp of the upper first molar aligned?
In Angle's class II, where is the distobuccal cusp of the upper first molar aligned?
In Angle's class II division I, how are the upper incisors positioned?
In Angle's class II division I, how are the upper incisors positioned?
In Angle's class II division II, how are the upper incisors positioned?
In Angle's class II division II, how are the upper incisors positioned?
In Angle's class III, where is the mesiobuccal cusp of the upper first molar aligned?
In Angle's class III, where is the mesiobuccal cusp of the upper first molar aligned?
What does subdivision refer to in malocclusion?
What does subdivision refer to in malocclusion?
What is the end-to-end relation of the first molar in permanent dentition?
What is the end-to-end relation of the first molar in permanent dentition?
In Angle's class I, what type of anterior crossbite is classified according to Dewey?
In Angle's class I, what type of anterior crossbite is classified according to Dewey?
Dewey's type I for Angle's class I indicates what condition?
Dewey's type I for Angle's class I indicates what condition?
Dewey's type II for Angle's class I refers to what?
Dewey's type II for Angle's class I refers to what?
Dewey's type III for Angle's class I describes what condition?
Dewey's type III for Angle's class I describes what condition?
Dewey's type IV for Angle's class I indicates what dental condition?
Dewey's type IV for Angle's class I indicates what dental condition?
What results in mesial migration of first permanent molars according to Dewey's type V for Angle's class I?
What results in mesial migration of first permanent molars according to Dewey's type V for Angle's class I?
What does Dewey's type I for Angle's class III describe?
What does Dewey's type I for Angle's class III describe?
What is Bennett's class I indicative of?
What is Bennett's class I indicative of?
What is Bennett's class II?
What is Bennett's class II?
What is Bennett's class III?
What is Bennett's class III?
What does a transposition of a tooth refer to?
What does a transposition of a tooth refer to?
What is the most common transposition of teeth?
What is the most common transposition of teeth?
What is torsiversion?
What is torsiversion?
What does perversion refer to in dental terms?
What does perversion refer to in dental terms?
What is neutrocclusion?
What is neutrocclusion?
What is distocclusion?
What is distocclusion?
What is mesocclusion?
What is mesocclusion?
What does post-normal occlusion refer to?
What does post-normal occlusion refer to?
What does prenormal refer to?
What does prenormal refer to?
What is infraversion?
What is infraversion?
What does buccocclusion mean?
What does buccocclusion mean?
What is linguocclusion?
What is linguocclusion?
Study Notes
Key Concepts in Malocclusion
- Mesiobuccal Cusp: The permanent maxillary first molar's mesiobuccal cusp is crucial in Angle's classification of malocclusion.
- Normal Occlusion: In normal occlusion, the mesiobuccal cusp of the maxillary first molar occludes with the buccal groove of the mandibular first molar.
Classification of Malocclusion
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Angle's Class I: Characterized by the mesiobuccal cusp of the upper first molar aligned with the mesiobuccal groove of the lower first molar.
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Class I Features: Includes intra-arch malocclusion and variations such as crowding, proclination, anterior crossbite, and posterior crossbite.
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Angle's Class II: The distobuccal cusp of the upper first molar aligns with the mesiobuccal groove of the lower first molar (upper dentition is a cusp ahead) and subdivides into:
- Division I: Upper incisors are proclined.
- Division II: Upper incisors are reclined.
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Angle's Class III: The mesiobuccal cusp of the upper first molar aligns with the distobuccal groove of the lower first molar (lower dentition is a cusp ahead).
Zygoma and Key Ridge
- Zygoma Correspondence: In deciduous dentition, the zygoma corresponds to the maxillary second molar while in permanent dentition, it corresponds to the mesiobuccal root of the maxillary first molar.
- Key Ridge: Defined as the lowest point on the zygoma's outline, relating to the mesiobuccal root of the upper first molar and transmitting force to the zygomatic buttress.
Dewey's Classification of Anterior Crossbites
- Type I: Crowding of anterior teeth.
- Type II: Proclination of anterior teeth.
- Type III: Anterior crossbite.
- Type IV: Posterior crossbite.
- Type V: Mesial migration of the first permanent molars due to the loss of adjacent teeth.
Bennett's Classification
- Bennett's Class I: Abnormal positioning of one or more teeth caused by local factors.
- Bennett's Class II: Abnormal formation of a part or whole arch due to developmental defects in bone.
- Bennett's Class III: Abnormal relationship between the upper and lower arches, correlating with abnormal arch formation.
Common Terms in Orthodontics
- Transposition: Eruption of a tooth in an unusual position, with the canine often replacing a lateral incisor or first premolar.
- Torsiversion: A tooth that is twisted.
- Perversion: An impacted tooth.
- Neutrocclusion: Equivalent to Angle's Class I.
- Distocclusion: Equivalent to Angle's Class II.
- Mesocclusion: Equivalent to Angle's Class III.
- Post-Normal Occlusion: Refers to Class II malocclusion.
- Prenormal: Refers to Class III malocclusion.
- Infraversion: A tooth that has not erupted to the line of occlusion.
- Buccocclusion: Buccal placement of a tooth or group of teeth.
- Linguocclusion: Lingual placement of a tooth or group of teeth.
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Test your knowledge on the classification of malocclusion with these flashcards. Each card covers crucial concepts and definitions, helping you understand the different classes of malocclusion and key terminology in orthodontics. Perfect for students and professionals alike in the field of dentistry.
