Risk factors for lower border notching after bilateral mandibular sagittal ramus advancement: three-dimensional evaluation. Issue 5 (May 2023)

• Record Type: Journal Article
• Authors: Masson, A.; Veyssiere, A.; Briant, A.; Weill, P.; Preud'homme, R.; Benateau, H.
• Is Part Of: International journal of oral & maxillofacial surgery. Volume 52:Issue 5(2023)
• Page Start: 577
• Page End: 583
• Publication Date: 2023-05
• Subjects: Orthognathic surgery -- Mandibular advancement -- Bone grafting -- Bone resorption -- Risk; Mouth -- Surgery -- Periodicals; Maxilla -- Surgery -- Periodicals; Dentistry -- Periodicals; Dentistry, Operative; Oral Surgical Procedures; Surgery, Oral; Dentistry; Maxilla -- Surgery; Mouth -- Surgery; Electronic journals; Periodicals; 617.52059
• DOI: 10.1016/j.ijom.2022.08.020
• Languages: English
• ISSNs: 0901-5027

Abstract

Abstract: Bilateral sagittal split osteotomy (BSSO) mandibular advancement can cause mandibular lower border notching (MLBN). The objective of this study was to calculate the incidence of MLBN and identify risk factors. This single-centre, retrospective study was performed between January 2018 and November 2020, in the Maxillofacial Surgery Department, Centre Hospitalier Universitaire, Caen. Patients who underwent BSSO advancement and had cone beam computed tomography (CBCT) scans obtained preoperatively, immediately postoperative (within 1 week), and late postoperative (≥1 year) were included. Measurements were made on the CBCT images. A total of 113 patients (226 operated sides) were enrolled. Mean age at the time of surgery was 17 years; 66.4% of patients were female and 33.6% were male. MLBN was observed on 35 operated sides (15.5% of sides). Advanced age ( P = 0.002) and the degree of mandibular advancement ( P = 0.008) were determined to be risk factors for developing MLBN. Sex, the operated side, third molar removal, and genioplasty were not associated with an increased occurrence of MLBN. Older patient age at the time of surgery and the requirement for a large advancement should be taken into consideration by the surgeon in order to reduce the risk of MLBN by using a modified BSSO procedure or bone grafting.