The mesio-buccal cusp of the maxillary first molar is aligned directly over the buccal groove of the mandibular first molar
Class I dental and skeletal relationship
Class I anterior relationship
Class I interarch relationship
The mesio-buccal cusp of the mandibular first molar occludes in the central fossa area of the maxillary first molar A.K.A Disto-Occlusion, i.e. the mandible is placed distally.
Long overjet, deep bite.
Short overjet, lingually inclined maxillary centrals.
Interarch relationships of Class II molar occlusion.
The mesio-buccal cusp of the maxillary first molar is situated over the embrasure between the mandibular first and second molar A.K.A. Mesio-occlusion. The mandible is placed mesially.
Class III dental and skeletal relationship.
Class III anterior relationships.
Class III interarch relationships.