MALOCCLUSION IN PERMANENT DENTITION

CLASS I
 The buccal groove of mandibular 1st permanent molar must occlude with the mesiobuccal cusp of maxillary 1st molar

CLASS II div I
 Buccal groove of mandibular molar occludes posterior to the mesiobuccal cusp of maxillary 1st molar

CLASS II div I
 Maxillary anterior proclination
 Cause — growth discrepancy
 Soft tissue protrusion in: Class II mod I.

CLASS II div 2
 Maxillary anterior proclined, where laterals proclined and C I’s retroclined
 Cause — growth discrepancy

TRUE CLASS III
 Buccal groove of mandibular molar occludes anterior to the mesiobuccal cusp of maxillary 1st molar
 Skeletal malocclusion
 Cause – hereditary

PSEUDO CLASS III
 Habitual

CANINE RELATIONSHIP
The canine relationship can be used as another method of classifying the AP occlusal relationship.
The classification is outlined below:
 Class I – the maxillary permanent canine occludes in the embrasure between the lower canine and 1st premolar
 Class II – the maxillary canine occludes anterior to the embrasure between the lower canine and 1st premolar.
 Class III – the maxillary canine occludes posterior to the embrasure between the lower canine and 1st premolar