Federico Hernández-Alfaro1, Mirco Raffaini2, Ariane Paredes-de-Sousa-Gil3, Alice Sara Magri4, Raquel Guijarro-Martínez5, Adaia Valls-Ontañón6. 1. Chief, Maxillofacial Institute, Quirón-Teknon Medical Center Barcelona, Barcelona; Professor and Department Head, Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Barcelona, Spain. 2. Chief, Face Surgery Center, Parma; Professor and Department Head, Department of Maxillofacial Surgery, Università degli Studi di Firenze, Firenze, Italy. 3. DDS Fellow, Maxillofacial Institute, Quirón-Teknon Medical Center Barcelona, Barcelona, Spain. 4. Attending Surgeon, Face Surgery Center, Parma, Italy. 5. Attending Surgeon, Maxillofacial Institute, Quirón-Teknon Medical Center Barcelona, Barcelona; Associate Professor, Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Barcelona, Spain. 6. Attending Surgeon, Maxillofacial Institute, Quirón-Teknon Medical Center Barcelona, Barcelona; Associate Professor, Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Barcelona, Spain. Electronic address: avalls@institutomaxilofacial.com.
Abstract
PURPOSE: This study evaluated the long-term stability of bilateral sagittal split ramus osteotomy fixed with a single miniplate with 4 monocortical screws and 1 bicortical screw (hybrid technique [HT]) using 3-dimensional (3D) analysis and an objective measuring tool, cone-beam computed tomography (CBCT). MATERIALS AND METHODS: Sixty-four patients who underwent bimaxillary surgery with mandibular advancement fixed with the HT were selected from 2 different institutions and enrolled in this retrospective study. All patients underwent CBCT preoperatively, 1 month after surgery, and 12 months after surgery. To estimate the long-term stability of the HT, volumetric comparisons were performed using the following measurements: distance between the gonion and the B point in the sagittal plane; distance between the right and left gonion transversally; and the angle of the line connecting the mandibular notch and the gonion and the line connecting the gonion and the B point vertically. RESULTS: Statistical analysis showed no relevant relapse (<1 mm or <1°) when using the HT. However, a positive correlation between the amount of advancement and the amount of postoperative relapse was observed. CONCLUSION: The HT produces stable postoperative 3D results after 12 months.
PURPOSE: This study evaluated the long-term stability of bilateral sagittal split ramus osteotomy fixed with a single miniplate with 4 monocortical screws and 1 bicortical screw (hybrid technique [HT]) using 3-dimensional (3D) analysis and an objective measuring tool, cone-beam computed tomography (CBCT). MATERIALS AND METHODS: Sixty-four patients who underwent bimaxillary surgery with mandibular advancement fixed with the HT were selected from 2 different institutions and enrolled in this retrospective study. All patients underwent CBCT preoperatively, 1 month after surgery, and 12 months after surgery. To estimate the long-term stability of the HT, volumetric comparisons were performed using the following measurements: distance between the gonion and the B point in the sagittal plane; distance between the right and left gonion transversally; and the angle of the line connecting the mandibular notch and the gonion and the line connecting the gonion and the B point vertically. RESULTS: Statistical analysis showed no relevant relapse (<1 mm or <1°) when using the HT. However, a positive correlation between the amount of advancement and the amount of postoperative relapse was observed. CONCLUSION: The HT produces stable postoperative 3D results after 12 months.
Authors: Jeroen Liebregts; Frank Baan; Pieter van Lierop; Martien de Koning; Stefaan Bergé; Thomas Maal; Tong Xi Journal: Sci Rep Date: 2019-02-28 Impact factor: 4.379