Three-dimensional analysis of long-term stability after bilateral sagittal split ramus osteotomy fixed with a single miniplate with four monocortical screws and one bicortical screw: a retrospective two-center study

Publication date: Available online 4 January 2017
Source:Journal of Oral and Maxillofacial Surgery
Author(s): F. Hernández-Alfaro, M. Raffaini, A. Paredes-de-Sousa-Gil, A.S. Magri, R. Guijarro-Martínez, A. Valls-Ontañón
PurposeThis study aims to evaluate the long-term stability after BSSRO fixed with a single miniplate with four monocortical screws and one bicortical screw (hybrid technique - HT), with the use of a three-dimensional (3D) analysis and an objective measuring tool: cone-beam computed tomography (CBCT).Patients and methodsSixty-four patients who underwent bimaxillary surgery with mandibular advancement fixed with HT were selected from two different departments and enrolled in this retrospective study. All patients received a CBCT scan at 3 time points: preoperatively, 1 month after surgery, and 12 months after surgery. In order to estimate the long-term stability of the HT method, volumetric comparisons were performed using the following measurements: distance between Gonion – B point in the sagittal plane; distance between Gonion (right) - Gonion (left) transversally; and angle between the "mandibular notch-Gonion" plane and the "Gonion – B point" plane vertically.ResultsStatistical analysis evidenced no significant relapse (<1mm or <1º) when using the HT. However, a positive correlation between the amount of advancement and the amount of postoperative relapse was demonstrated.ConclusionIt can be concluded that the HT obtains 3D stable postoperative results after 12 months.



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