P Nicol1,2, T Loncle3, G Pasquet4, C Vacher5,6,7. 1. Anatomy, Université de Paris, Paris, France. 2. Department of Maxillofacial Surgery, Hôpital Beaujon, APHP, 100 Boulevard du Général Leclerc, 92110, Clichy, France. 3. Department of Maxillofacial Surgery, Clinique Hartmann, Neuilly-Sur-Seine, France. 4. Cabinet de Radiologie Dentaire, 179 rue St Honoré, 75001, Paris, France. 5. Anatomy, Université de Paris, Paris, France. christian.vacher@aphp.fr. 6. Department of Maxillofacial Surgery, Hôpital Beaujon, APHP, 100 Boulevard du Général Leclerc, 92110, Clichy, France. christian.vacher@aphp.fr. 7. Université de Paris, EA2496, 92120, Montrouge, France. christian.vacher@aphp.fr.
Abstract
PURPOSE: In bilateral sagittal split osteotomy (BSSO), the risk of lesion of the inferior alveolar nerve (IAN) is important. The aim of this study was to investigate the situation of the IAN in the area of the BSSO in preoperative 158 CBCT. METHODS: The situation of the mandibular canal (MC) has been studied in six coronal sections (one section each 4 mm) from the proximal root of the second mandibular molar. The height of the MC related to the height of the mandible, and the horizontal distance between the MC and the lateral cortical plate related to the mandibular width have been determined in each section. The cancellous bone width has been measured allowing to determine a cancellous bone ratio. RESULTS: The variability of the MC was high, depending mainly on the cancellous bone ratio which was higher when the IAN was deep. When a third molar was present, the MC was lower in the area of the third molar. CONCLUSIONS: To decrease the risk of injuring the IAN in BSSO, the evaluation of the cancellous bone ratio by a preoperative CBCT may be proposed to adapt the surgical technique to the anatomy.
PURPOSE: In bilateral sagittal split osteotomy (BSSO), the risk of lesion of the inferior alveolar nerve (IAN) is important. The aim of this study was to investigate the situation of the IAN in the area of the BSSO in preoperative 158 CBCT. METHODS: The situation of the mandibular canal (MC) has been studied in six coronal sections (one section each 4 mm) from the proximal root of the second mandibular molar. The height of the MC related to the height of the mandible, and the horizontal distance between the MC and the lateral cortical plate related to the mandibular width have been determined in each section. The cancellous bone width has been measured allowing to determine a cancellous bone ratio. RESULTS: The variability of the MC was high, depending mainly on the cancellous bone ratio which was higher when the IAN was deep. When a third molar was present, the MC was lower in the area of the third molar. CONCLUSIONS: To decrease the risk of injuring the IAN in BSSO, the evaluation of the cancellous bone ratio by a preoperative CBCT may be proposed to adapt the surgical technique to the anatomy.
Authors: Gertjan Mensink; Albert Zweers; Ron Wolterbeek; Gertjan G J Dicker; Robert H Groot; Richard J P R van Merkesteyn Journal: J Craniomaxillofac Surg Date: 2012-03-20 Impact factor: 2.078
Authors: Tyler Koivisto; Daphne Chiona; Laura L Milroy; Scott B McClanahan; Mansur Ahmad; Walter R Bowles Journal: J Endod Date: 2016-05-11 Impact factor: 4.171
Authors: M Velasco-Torres; M Padial-Molina; G Avila-Ortiz; R García-Delgado; A Catena; P Galindo-Moreno Journal: Med Oral Patol Oral Cir Bucal Date: 2017-09-01