Factors influencing condylar position after the bilateral sagittal split osteotomy fixed with bicortical screws

American Journal of Orthodontics and Dentofacial Orthopedics

Bailey

Tucker

et al. 2007

190

119

Section: Conclusion-mentioning

confidence: 99%

Three-dimensional cone-beam computed tomography for assessment of mandibular changes after orthognathic surgery

American Journal of Orthodontics and Dentofacial Orthopedics

Bailey

Tucker

et al. 2007

190

119

“…[3][4][5] Assessment of surgical treatment outcomes with 3-dimensional (3D) cone-beam computed tomography (CBCT) images and superimposition tools 6 allowed the identification and quantification of bone displacement and remodeling that can help to explain the interactions between dental, skeletal, and soft-tissue components that underpin the response to treatment. 7,8 Previous studies used 3D virtual model superimposition techniques to assess postsurgical outcomes and stability in Class III patients; however, postsurgical outcomes of Class II correction have not been evaluated with this methodology.…”

mentioning

confidence: 99%

Three-dimensional assessment of mandibular advancement 1 year after surgery

Carvalho

American Journal of Orthodontics and Dentofacial Orthopedics

Motta

et al. 2010

“…It has being advocated in the literature 27 that a precise repositioning of the condyles during surgery would ensure stability of the surgical results and reduce temporomandibular joint noxious effects. It might improve postoperative masticatory function, but the extent of condylar change that is compatible with normal function postsurgically is still unknown.…”

Section: Discussionmentioning

confidence: 99%

Deslocamentos esqueléticos associados à cirurgia de avanço mandibular: avaliação quantitativa tridimensional

Motta

Carvalho

Dental Press J. Orthod.

et al. 2010

Objective: To evaluate changes in the position and remodeling of the mandibular rami, condyles and chin with mandibular advancement surgery through the superimposition of 3D Cone-Beam Computed Tomography (CBCT) models. Methods: This prospective observational study used pre-surgery and post-surgery CBCT scans of 27 subjects presenting skeletal Class II with normal or horizontal growth pattern. An automatic technique of cranial base superimposition was used to assess positional and/or remodeling changes in anatomic regions of interest. Displacements were visually displayed and quantified by 3D color maps. Descriptive statistics consisted of mean values, standard deviations and minimum/ maximum displacements. Changes greater than 2 mm were considered clinically relevant, and a categorization was done. Positive and negative displacements showed each region directional tendency. To test if displacements in anatomic regions were associated with each other, Pearson correlation coefficients were used under a 95% significance level. Results: The chin moved anterior-inferiorly 6.81±3.2 mm on average and the inferior portion of the rami moved laterally (left: 2.97±2.71 mm; right: 2.34±2.35 mm). Other anatomic regions showed <2 mm mean displacements, but with evident individual variability. Significant statistical correlations were positive and moderate. The condyles, posterior border and superior portion of the rami showed a bilateral correlation, and the superior and inferior portion of the rami an ipsilateral correlation. Conclusion: This 3D method allowed clear visualization and quantification of surgery outcomes, with an anterior-inferior chin displacement and a lateral movement on the inferior portion of the rami, but with considerable individual variability in all the evaluated anatomic regions. IntROduCtIOnBilateral sagittal split ramus osteotomy (BSSO) is frequently performed in cases of mandibular advancement surgery. Despite its popularity, post-surgical instability due to displacement of the condyle from its seated position in the glenoid fossa in the three planes of space (ie, sagittal, vertical, and transverse) remains an area of concern.