Dae-Seok Hwang1, Yong-Il Kim2, Kyung-Min Lee3. 1. Department of Oral & Maxillofacial Surgery (Head: Prof. D.S. Hwang, PhD), Pusan National University Hospital, Busan, South Korea. 2. Department of Orthodontics (Head: Prof. Y.I. Kim, PhD), Pusan National University Hospital, Busan, South Korea. Electronic address: 9553113a@daum.net. 3. Department of Orthodontics (Head: Prof. H.S. Hwang, PhD), Chonnam National University Hospital, Gwangju, South Korea.
Abstract
INTRODUCTION: To investigate the effect of intended manual condylar positioning on skeletal changes from preoperative stage to posttreatment stage. MATERIALS AND METHODS: The sample comprised 23 patients divided into two groups according to surgery type: mandible-only setback surgery (group I) versus 2-jaw surgery (group II). CBCT-generated Half-Cephalograms were fabricated to evaluate the skeletal, dental, and condylar positioning changes for each subject at three time points (preoperatively (T0), immediate-postoperatively (T1), and posttreatment (T2)). RESULTS: The angle of the proximal segment in group II was reduced immediate-postoperatively. In both groups, the result showed a negative mean value for the horizontal mandibular position (B point to N-perpendicular plane at T2-T1 stage). In group II, the vertical mandibular position (B point to FH plane at T2-T1 stage) also had a negative mean value. In group I, the change of the B point to N-perpendicular plane (T2-T1) had statistically significant correlations with the change of the Cd to Po-perpendicular plane (T2-T1). In group II, the change of the B point to the N-perpendicular plane (T2-T1) had statistically significant correlations with the change of the <Cd-Cp-FH plane angle (T2-T1) and the Cp to FH plane (T1-T0). CONCLUSIONS: In this study, the change from the T1 to T2 stage, though not statistically significant, showed a negative short-term relapse. Intended manual condylar positioning may suppress the short-term skeletal relapse.
INTRODUCTION: To investigate the effect of intended manual condylar positioning on skeletal changes from preoperative stage to posttreatment stage. MATERIALS AND METHODS: The sample comprised 23 patients divided into two groups according to surgery type: mandible-only setback surgery (group I) versus 2-jaw surgery (group II). CBCT-generated Half-Cephalograms were fabricated to evaluate the skeletal, dental, and condylar positioning changes for each subject at three time points (preoperatively (T0), immediate-postoperatively (T1), and posttreatment (T2)). RESULTS: The angle of the proximal segment in group II was reduced immediate-postoperatively. In both groups, the result showed a negative mean value for the horizontal mandibular position (B point to N-perpendicular plane at T2-T1 stage). In group II, the vertical mandibular position (B point to FH plane at T2-T1 stage) also had a negative mean value. In group I, the change of the B point to N-perpendicular plane (T2-T1) had statistically significant correlations with the change of the Cd to Po-perpendicular plane (T2-T1). In group II, the change of the B point to the N-perpendicular plane (T2-T1) had statistically significant correlations with the change of the <Cd-Cp-FH plane angle (T2-T1) and the Cp to FH plane (T1-T0). CONCLUSIONS: In this study, the change from the T1 to T2 stage, though not statistically significant, showed a negative short-term relapse. Intended manual condylar positioning may suppress the short-term skeletal relapse.