10
Classification of malocclusion
Table 10.1 The Angle classification of malocclusion.
| Classification | Notes |
| Class I | The buccal groove of the mandibular first permanent molar should occlude with the mesio-buccal cusp of the maxillary first molar. This is considered to be the normal relationship. |
| Class II | The buccal groove of the mandibular first permanent molar occludes posterior to the mesio-buccal cusp of the maxillary first molar. The degree of discepancy is described as a fraction of the mesio-distal width of a premolar unit. |
| Division 1 | The maxillary central incisors are proclined or normally inclined and the overjet is increased. |
| Division 2 | The maxillary central incisors are retroclined. |
| Class III | The buccal groove of the mandibular first permanent molar occludes anterior to the mesio-buccal cusp of the maxillary first molar. |
Table 10.2 The British Standards Institute’s classification of incisor relationship.
| Incisor classification | Definition |
| Class I | The lower incisor edges occlude on or lie below the cingulum plateau of the upper incisiors. |
| Class II, division 1 | The lower incisor edges occlude behind the cingulum plateau of the upper incisors and the upper incisors are normally inclined or proclined. |
| Class II, division 2 | The lower incisor edges occlude behind the cingulum plateau of the upper incisors and the upper incisors are retroclined. |
| Class III | The lower incisor edges occlude anterior to the cingulum plateau of the upper incisors. |
Figure 10.1 Andrews Class I molar relationship (i) results in better buccal intercuspation (note the maxillary premolar occlusion) than an Angle Class I relationship (ii) where the first molar is slightly further anteriorly positioned.
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