CBCT location of the fusion between the buccal and lingual cortical in the mandibular ramus: importance to sagittal split osteotomy.

Autor:	Scomparin L; Faculdade de Odontologia de Bauru, Alameda Otavio Pinheiro Brisolla 9-75, Bauru- SP, CEP 17012-901, Brazil, izrubira@fob.usp.br., Soares MQ, Rubira CM, Yaedú RY, Imada TS, Centurion BS, Tolentino ES, Lauris JR, Rubira-Bullen IR
Jazyk:	angličtina
Zdroj:	Medicina oral, patologia oral y cirugia bucal [Med Oral Patol Oral Cir Bucal] 2017 Jul 01; Vol. 22 (4), pp. e500-e505. Date of Electronic Publication: 2017 Jul 01.
DOI:	10.4317/medoral.21632
Abstrakt:	Background: Mandibular Sagittal Split Osteotomy (MSSO) is a popular technique in orthognathic surgery used both to advance and to retreat the mandible. However, MSSO may incur in important complications, such as bad splits and sensorineural injuries. Knowing the location of the fusion between the buccal and lingual cortical (FBLC) in the mandibular ramus and the bone thickness in the region where osteotomies will be performed is determinant in MSSO planning to avoid complications. The aim of this study was to document and evaluate possible differences between sexes regarding the location of the FBLC in relation to the superior cortical of mandibular foramen (MF) and bone thickness in the region of interest for MSSO in a Brazilian population. Material and Methods: Eighty five cone-beam Computed Tomography (CBCT) scans were used to perform linear measurements to determine the location of the FBLC. Bone thickness from the mandibular canal (MC) to the cortical external surfaces and the diameter of the MC were measured at three different points: mandibular ramus (A), mandibular angle (B) and mesial of the second molar (C). Results: The FBLC was located at a mean distance of 8.3 mm from the superior cortical of the MF in males and 8.1 mm in females. There was no difference between males and females regarding the mean bone thickness from the MC to the buccal external surface at all the points investigated (p>0.05). Bone thickness from the lingual external surface to the MC was bigger among females than males in regions B and C (p < 0.05). The diameter of the MC was bigger among males in regions B and C. Conclusion: Sexual dimorphism regarding mandibular bone thickness but not regarding the location of FBLC was present. This fundamental knowledge may assist to the panning of MSSO.
Databáze:	MEDLINE
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