- The mesiobuccal cusp of the maxillary first molar lies in the mesiobuccal groove of the mandibular first molar, but the other teeth may have other anomalies such as spacing, crowding, open bite etc.
- Is also called Distocclusion, or Mandibular Retrognathism
- The mesiobuccal cusp of the upper molar is situated anterior to the mesiobuccal groove
- Two subdivisions exist:
- Division 1 (II/1) --> Anterior teeth protrude
- Division 2 (II/2) --> Central incisors are retroclined and the lateral incisors are seen to overlap the centrals
- Is also called Mandibular Prognathism
- The mesiobuccal cusp lies posterior to the mesiobuccal groove of the first mandibular molar