title: Evaluation of the accuracy of linear measurements on multi-slice and cone beam computed tomography scans to detect the mandibular canal during bilateral sagittal split osteotomy of the mandible.
abstract: The aim of this study was to compare the accuracy of linear measurements of the distance between the mandibular cortical bone and the mandibular canal using 64-detector multi-slice computed tomography (MSCT) and cone beam computed tomography (CBCT). It was sought to evaluate the reliability of these examinations in detecting the mandibular canal for use in bilateral sagittal split osteotomy (BSSO) planning. Eight dry human mandibles were studied. Three sites, corresponding to the lingula, the angle, and the body of the mandible, were selected. After the CT scans had been obtained, the mandibles were sectioned and the bone segments measured to obtain the actual measurements. On analysis, no statistically significant difference was found between the measurements obtained through MSCT and CBCT, or when comparing the measurements from these scans with the actual measurements. It is concluded that the images obtained by CT scan, both 64-detector multi-slice and cone beam, can be used to obtain accurate linear measurements to locate the mandibular canal for preoperative planning of BSSO. The ability to correctly locate the mandibular canal during BSSO will reduce the occurrence of neurosensory disturbances in the postoperative period.
authors.affiliation: School of Dentistry and Research Centre, São Leopoldo Mandic, Campinas, São Paulo, Brazil; School of Dentistry, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. Electronic address: belinimaia@gmail.com.
authors.forename: B
authors.initials: B
authors.lastname: Freire-Maia
authors.affiliation: School of Dentistry, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
authors.forename: V deC
authors.initials: VD
authors.lastname: Machado
authors.affiliation: School of Dentistry, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
authors.forename: C S
authors.initials: CS
authors.lastname: Valerio
authors.affiliation: School of Dentistry, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
authors.forename: A L N
authors.initials: AL
authors.lastname: Custódio
authors.affiliation: School of Dentistry, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
authors.forename: F R
authors.initials: FR
authors.lastname: Manzi
authors.affiliation: School of Dentistry and Research Centre, São Leopoldo Mandic, Campinas, São Paulo, Brazil.
authors.forename: J L C
authors.initials: JL
authors.lastname: Junqueira
mesh_terms: D059925:Anatomic Landmarks; D054893:Cone-Beam Computed Tomography; D006801:Humans; D066298:In Vitro Techniques; D008334:Mandible / Q000000981:diagnostic imaging* / Q000601:surgery*; D059229:Osteotomy, Sagittal Split Ramus; D015203:Reproducibility of Results; D014057:Tomography, X-Ray Computed
keywords: cone beam computed tomography; dimensional measurement accuracy; multi-slice computed tomography; orthognathic surgery