Different Strategies of Pre-surgical Orthodontic Treatment and Surgical Planning According to Diverse Facial Asymmetry Phenotypes in Skeletal Class III Patients

The purposes of this presentation are to explain the characteristics of diverse phenotypes of skeletal Class III malocclusion and facial asymmetry in adult patients and to discuss the strategic decompensation by pre-surgical orthodontic treatment and considerations for surgical planning according to the Class III malocclusion and FA phenotypes.

Based on my recent cluster analysis studies, Class III phenotypes were classified into 4 major groups: (I) Retrusive maxilla group: (II) Relatively protrusive mandible group: (III) Protrusive mandible group: and (IV) Protrusive maxilla and protrusive mandible group. These findings indicate that the anteroposterior position of the maxilla and rotation of the mandible by patient’s vertical pattern might decide the Class III phenotypes. The facial asymmetry phenotypes were classified into five: 1) non-asymmetry type; 2) maxillary-cant type); 3) mandibular-shift and yaw group; 4) complex type; and 5) maxillary reverse-cant type.

According to these results, strategic decompensation by pre-surgical orthodontic treatment and considerations for surgical planning according to the Class III and facial asymmetry phenotypes will be explained with a series of cases.