title: Early changes in condylar position after mandibular advancement: a three-dimensional analysis.
abstract: The aim of this study was to perform a three-dimensional (3D) assessment of positional changes of the mandibular condyle after bilateral sagittal split osteotomy (BSSO). A prospective evaluation of 22 skeletal class II patients who underwent a BSSO for mandibular advancement was performed. Pre- and postoperative cone beam computed tomography scans were taken. Using the cranial base as a stable reference, the pre- and postoperative 3D skull models were superimposed virtually. Positional changes of the condyles were assessed with a 3D colour mapping system (SimPlant O&O). A Brunner-Langer statistical test was applied to test the null hypothesis that the condylar position remains stable after BSSO. The level of significance was set at 0.05. The mean mandibular advancement in the studied sample was 6.7±1.6mm. Overall, the condylar positional changes after BSSO for mandibular advancement were statistically significant (P<0.05). A positive correlation was found between the displacement of the left condyle and the amount of mandibular advancement (P<0.01). The results of this study suggest that statistically significant changes of condylar position occur after mandibular advancement. Long-term evaluation is needed to assess the capacity of the temporomandibular joint to adapt to these changes.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, S. Cugat del Vallés , Barcelona, Spain; Institute of Maxillofacial Surgery, Teknon Medical Centre, Barcelona, Spain. Electronic address: manjon.irene@uic.es.
authors.forename: I
authors.initials: I
authors.lastname: Méndez-Manjón
authors.affiliation: Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, S. Cugat del Vallés , Barcelona, Spain; Institute of Maxillofacial Surgery, Teknon Medical Centre, Barcelona, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Guijarro-Martínez
authors.affiliation: Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, S. Cugat del Vallés , Barcelona, Spain; Institute of Maxillofacial Surgery, Teknon Medical Centre, Barcelona, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Valls-Ontañón
authors.affiliation: Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, S. Cugat del Vallés , Barcelona, Spain; Institute of Maxillofacial Surgery, Teknon Medical Centre, Barcelona, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Hernández-Alfaro
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D008297:Male; D019186:Mandibular Advancement; D008335:Mandibular Condyle / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D008875:Middle Aged; D011446:Prospective Studies; D013704:Temporomandibular Joint / Q000000981:diagnostic imaging
keywords: bilateral sagittal split osteotomy; retrognathia; temporomandibular joint; three-dimensional analysis