INTRODUCTION: Limitations of 2D quantitative and qualitative evaluation of surgical displacements can be overcome by CBCT and three-dimensional imaging tools. OBJECTIVES: The method described in this study allows the assessment of changes in the condyles, rami, chin, maxilla and dentition by the comparison of CBCT scans before and after orthognathic surgery. METHODS: 3D models are built and superimposed through a fully automated voxel-wise method using the pre-surgery cranial base as reference. It identifies and compares the grayscale of both three-dimensional structures, avoiding observer landmark identification. The distances between the anatomical surfaces pre and post-surgery are then computed for each pair of models in the same subject. The evaluation of displacement directions is visually done through color maps and semi-transparencies of the superimposed models. CONCLUSIONS: It can be concluded that this method, which uses free softwares and is mostly automated, shows advantages in the long-term evaluation of orthognathic patients when compared to conventional 2D methods. Accurate measurements can be acquired by images in real size and without anatomical superimpositions, and great 3D information is provided to clinicians and researchers.
INTRODUCTION: Limitations of 2D quantitative and qualitative evaluation of surgical displacements can be overcome by CBCT and three-dimensional imaging tools. OBJECTIVES: The method described in this study allows the assessment of changes in the condyles, rami, chin, maxilla and dentition by the comparison of CBCT scans before and after orthognathic surgery. METHODS: 3D models are built and superimposed through a fully automated voxel-wise method using the pre-surgery cranial base as reference. It identifies and compares the grayscale of both three-dimensional structures, avoiding observer landmark identification. The distances between the anatomical surfaces pre and post-surgery are then computed for each pair of models in the same subject. The evaluation of displacement directions is visually done through color maps and semi-transparencies of the superimposed models. CONCLUSIONS: It can be concluded that this method, which uses free softwares and is mostly automated, shows advantages in the long-term evaluation of orthognathic patients when compared to conventional 2D methods. Accurate measurements can be acquired by images in real size and without anatomical superimpositions, and great 3D information is provided to clinicians and researchers.
Authors: L H S Cevidanes; L J Bailey; G R Tucker; M A Styner; A Mol; C L Phillips; W R Proffit; T Turvey Journal: Dentomaxillofac Radiol Date: 2005-11 Impact factor: 2.419
Authors: Lucia H S Cevidanes; L'Tanya J Bailey; Scott F Tucker; Martin A Styner; Andre Mol; Ceib L Phillips; William R Proffit; Timothy Turvey Journal: Am J Orthod Dentofacial Orthop Date: 2007-01 Impact factor: 2.650
Authors: Antonio Carlos de Oliveira Ruellas; Luis T Huanca Ghislanzoni; Marcelo Regis Gomes; Carlotta Danesi; Roberta Lione; Tung Nguyen; James A McNamara; Paola Cozza; Lorenzo Franchi; Lucia Helena Soares Cevidanes Journal: Am J Orthod Dentofacial Orthop Date: 2016-04 Impact factor: 2.650