Postoperative relapse after mandibular setback surgery with perioperative counterclockwise rotation of the mandibular proximal segment

Publication date: Available online 11 January 2016
Source:Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Author(s): Jae Bong Park, Im Geun Jin, Jeong Joon Han, Soon Jung Hwang
ObjectiveThis study aimed to evaluate whether the perioperative counterioclockwise rotation (CCWR) of the proximal segment (PS) can reduce relapse after mandibular setback surgery.Study designPatients who underwent less than one degree of bilateral perioperative rotation of the PS were assigned to group I (n = 15). Group II (n = 14) included patients showed greater than one degree of perioperative CCWR bilaterally. To evaluate the PS rotation and the relapse, three-dimensional computed tomograms (CT) and lateral cephalograms were analyzed.ResultsEven with significantly different perioperative CCWR of the PS (0.07±0.53° versus -3.47±1.55°), the relapse was not significantly different between group I (1.96±1.15 mm) and group II (1.81±0.92 mm). However, postoperative CCWR of the PS was significantly greater in group I. The relapse was not influenced by the amount of setback.ConclusionSmall degree of relapse is expected after mandibular setback surgery, even with perioperative CCWR of the PS.



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