Dental occlusion. A, B. Preoperative: Patient reported for preoperative orthodontic treatment. Class II occlusion with deep bite, dental crowding and convergent inclination of posterior upper teeth are observed. Tooth 47 is lacking. C, D. Postoperative: dental occlusion surgical and orthodontic treatments completed with correction of deep bite. Dental alignment and levelling improve stability of surgical results, characterized by acquisition of molar and canine occlusion keys associated with good intercuspidation and interdigitation of the remaining dental structures.