Classification of Malocclusion

Question 1

define Angle’s class I malocclusion

Answer 1

the mesiobuccal cusp of the upper first permanent molar occludes in the buccal groove of the lower first permanent molar- discrepancy cannot be greater than half a cusp

Question 2

define Angle’s class II malocclusion

Answer 2

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

Question 3

define Angle’s class III malocclusion

Answer 3

the mesiobuccal cusp of the upper first permanent molar occludes posterior to the groove of the lower first permanent molar

Question 4

define a class I incisor classification

Answer 4

lower incisor edges occlude with, or lie immediately below the cingulum plateau of the upper central incisors

Question 5

define a class II div 1 incisor malocclusion

Answer 5

the lower incisor edges lie posterior to the cingulum plateau of the upper incisors
the upper central incisors are proclaimed or of average inclination and there is an increased overjet

Question 6

define a class II div 2 incisor malocclusion

Answer 6

the lower incisor edges lie posterior to the cingulum plateau of the upper incisors
the upper central incisors are retroclined- the overjet is ususally minimal but may be increased

Question 7

define a class III incisor malocclusion

Answer 7

the lower incisor edges lie anterior to the cingulum plateau of the upper incisors
the overjet is reduced or reversed