A comparative study of initial lateral cephalometric characteristics: mandibular setback surgery only versus mandibular setback surgery with advancement genioplasty / 대한치과교정학회지

ABSTRACT

OBJECTIVE: The aim of this study was to compare the initial lateral cephalometric characteristics in two groups of patients those that had mandibular setback surgery only and those that had mandibular setback surgery with advancement genioplasty. METHODS: The lateral cephalograms of thirty-one patients were studied. Twenty-one Class III patients (group A) had only madibular setback surgery. Twelve Class III patients (group B) had mandibular setback surgery with advancement genioplasty. RESULTS: Differences between two groups were found in N-Me, ANS-Me, Occlusal Plane angle, Palatal Plane to U1, Mandibular Plane to L1, Mandibular Plane to L6, SN to U1, Sn-Stms, and Pog' projection. Compared to group A, group B showed more linguoversion and extrusion of upper incisors, more extrusion of lower incisors and lower first molar, and more steepness of the occlusal plane. N-Me, ANS-Me, and Sn-Stms were also longer in group B. But Pog' projection was shorter than group A. CONCLUSION: We conclude that certain initial lateral cephalometric characteristics may help indicate the inclusion of advancement genioplasty when mandibular setback surgery is planned in skeletal Class III patients.