Malocclusion

Question 1

Angle’s Molar classification (class 1)

Answer 1

Mesio buccal cusp of the upper first permanent molar should occlude with the anterior buccal groove of the lower first permanent molar

Question 2

Angle’s Molar classification (class 2)

Answer 2

Mesio buccal cusp of the upper first permanent molar occludes anterior to the anterior buccal groove of the lower first permanent molar

Question 3

Class 3

Answer 3

Mesio buccal cusp of the upper first permanent molar should occlude posterior to the anterior buccal groove of the lower first permanent molar

Question 4

Class 1 (incisors)

Answer 4

the lower incisor edge occludes with or lie immediately below the cingulum plateau of the upper central incisors

Question 5

Class II division 1

Answer 5

The lower incisor edges lie posterior to the cingulum plateau of the upper central incisors. The overjet is increased and centrals are usually proclined

Question 6

Class II division 2

Answer 6

The lower incisor edges lie posterior to the cingulum plateau of the upper central incisors. The overjet is usually minimal and the centrals are usually retroclined

Question 7

Local(non-skeletal) causes of malocclusion

Answer 7

• Anomalies in number of teeth
• Problems in the permanent dentition
• Problems in the deciduous dentition
• Soft tissue problems

Question 8

Aetiology of malocclusion

Answer 8

1) Tongue Thrust
2) Digit sucking (sucking thumb)
3) Super numeraries (extra teeth)
4) Oligodontia (ED, missing laterals)
5) Transposition (maxillary and mandibular arch)
6) Abnormal form
7) Loss of permanent (Trauma and compromised teeth)
8) Submergence of deciduous
9) Early loss of deciduous (mesial drift resulting in secondary crowding)
10) Retention of deciduous
11) Fleshy frenum