Anterior Dentoalveolar Setback: Anticipated Incisor Inclinations

Background: Predicting results is crucial when it comes to planning.Some patients after anterior maxilla-mandible osteotomy may choose not to have postoperative radiographs, however mobilized distances and directions of incisor-canine segment are regularly recorded in operative reports.Purpose: This retrospective study aimed to predict modifications in incisor orientation induced by the mobilization.Material and Methods: Out of 33 patients who underwent surgical anterior dentoalveolar setback, eleven did not have a cephalometric study after the operation and one had it 17 years later.Mobilizations of the central incisor tip were marked on the preoperative cephalometric tracings to draw an anticipated postoperative orientation.The predictors included the preoperative incisor inclination, the setback distance and upward mobilized distance of the segment.The main outcome involved geometrically calculated postoperative upper incisor-Frankfurt plane and lower incisor-mandibular plane angles.Paired and one sample t-tests were used to analyse the variables.Multiple regression models were used to create probable ideal equations predicting postoperative incisor inclinations.Results: Surgical results aesthetically and functionally satisfied patients.There was a highly significant reduction in inclination angles between the preoperative and the drawn postoperative inclination angles (P < 0.01) and the late cephalography of one patient supported the upper incisor aroused formula.The regression model equations were based on the predicted postoperative inclinations which were not significantly different from the normal standards (P > 0.05). Conclusion:Despite the occasional lack of postoperative cephalometric radiographs, it is still possible to preoperatively anticipate and postoperatively evaluate changes in the incisor inclination.