Orthodontics Malocclusion Classification Flashcards

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Questions and Answers

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?

Buccal groove of mandibular first molar

What is the only class of malocclusion with intra arch malocclusion?

Class I

The zygoma or key ridge corresponds to which part?

Mesiobuccal root of upper 1st molar Signup and view all the answers

What is key ridge?

Key ridge is the lowest point on the outline of zygoma Signup and view all the answers

In deciduous dentition, zygoma corresponds to which tooth?

Maxillary second molar Signup and view all the answers

The mesiobuccal cusp transmits force to which structure?

Zygomatic buttress Signup and view all the answers

In Angle's class I, where is the mesiobuccal cusp of the upper first molar aligned?

Mesiobuccal groove of lower molar Signup and view all the answers

In Angle's class II, where is the distobuccal cusp of the upper first molar aligned?

Mesiobuccal groove of lower first molar Signup and view all the answers

In Angle's class II division I, how are the upper incisors positioned?

Proclined Signup and view all the answers

In Angle's class II division II, how are the upper incisors positioned?

Reclined Signup and view all the answers

In Angle's class III, where is the mesiobuccal cusp of the upper first molar aligned?

Distobuccal groove of lower first molar Signup and view all the answers

What does subdivision refer to in malocclusion?

Class II or III is unilateral. Signup and view all the answers

What is the end-to-end relation of the first molar in permanent dentition?

One-half cusp class II Signup and view all the answers

In Angle's class I, what type of anterior crossbite is classified according to Dewey?

Type III Signup and view all the answers

Dewey's type I for Angle's class I indicates what condition?

Crowding of anterior teeth Signup and view all the answers

Dewey's type II for Angle's class I refers to what?

Proclination of anterior teeth Signup and view all the answers

Dewey's type III for Angle's class I describes what condition?

Anterior crossbite Signup and view all the answers

Dewey's type IV for Angle's class I indicates what dental condition?

Posterior crossbite Signup and view all the answers

What results in mesial migration of first permanent molars according to Dewey's type V for Angle's class I?

Loss of teeth anterior to it Signup and view all the answers

What does Dewey's type I for Angle's class III describe?

Heavy crowding of anterior teeth Signup and view all the answers

What is Bennett's class I indicative of?

Abnormal position of one or more teeth due to local causes Signup and view all the answers

What is Bennett's class II?

Abnormal formation of a part of or whole of either arch due to development defects of bone Signup and view all the answers

What is Bennett's class III?

Abnormal relationship between upper and lower arches correlated with abnormal formation of either arch Signup and view all the answers

What does a transposition of a tooth refer to?

Tooth erupted in an unusual position Signup and view all the answers

What is the most common transposition of teeth?

Canine in place of lateral incisor or first premolar Signup and view all the answers

What is torsiversion?

Twisted tooth Signup and view all the answers

What does perversion refer to in dental terms?

Impacted tooth Signup and view all the answers

What is neutrocclusion?

Angle's class I Signup and view all the answers

What is distocclusion?

Angle's class II Signup and view all the answers

What is mesocclusion?

Angle's class III Signup and view all the answers

What does post-normal occlusion refer to?

Class II malocclusion Signup and view all the answers

What does prenormal refer to?

Class III malocclusion Signup and view all the answers

What is infraversion?

Tooth not erupted to the line of occlusion Signup and view all the answers

What does buccocclusion mean?

Buccal placement of a tooth or a group of teeth Signup and view all the answers

What is linguocclusion?

Lingual placement of a tooth or a group of teeth Signup and view all the answers

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

Angle's Class I: Characterized by the mesiobuccal cusp of the upper first molar aligned with the mesiobuccal groove of the lower first molar.
Class I Features: Includes intra-arch malocclusion and variations such as crowding, proclination, anterior crossbite, and posterior crossbite.
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.
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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Description

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.