Regional changes following maxillary multissegmentation and the influence of surgical displacements: a CBCT quantitative assessment

• Grant number: 13/05831-8
• Support Opportunities: Regular Research Grants
• Start date: May 01, 2014
• End date: April 30, 2016
• Field of knowledge: Health Sciences - Dentistry - Orthodontics
• Principal Investigator: João Roberto Gonçalves
• Grantee: João Roberto Gonçalves
• Host Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil

Abstract

Among the benefits maxillary multissegmentation offers, is the possibility of transversal correction in one single surgery as opposed to the use of surgical assisted rapid maxillary expansion for treatment of adult patients with associated deformities (transversal, vertical and sagittal). The present study will collaborate with the current knowledge regarding the stability of multisegmental maxillary surgery that presents quite controversial in the current literature. Maxillary dimensional changes following LeFort I osteotomy will be studied with Cone Bean Computed Tomography (CBCT) of 90 individuals divided in 3 comparative groups (30 individuals each) according to the transversal skeletal increase at upper first molar level (TI), immediately after surgery. Group 1 (TI e2 mm.), Group 2 (TI < 2 mm.) and Group 3 (Control / Le Fort I in one single piece). Three CBCT volumes from each individual (T1 - pre-surgical, T2 - immediate post-surgical and T3 - minimum of one year following surgery) will be constructed and superimposed using a voxel-wise rigid registration method. Skeletal and dental stability will be quantitatively assessed by shape correspondence using Spharm-PDM software based on Spheric Harmonics that include specific statistical package built over generalized linear models and multiple regression analysis in order to evaluate eventual association with dependent variables to be tested. (AU)