Antonio Carlos de Oliveira Ruellas1, Cristiano Tonello2, Liliane Rosas Gomes3, Marilia Sayako Yatabe4, Lucie Macron5, Julia Lopinto5, Joao Roberto Goncalves6, Daniela Gamba Garib Carreira7, Nivaldo Alonso8, Bernardo Quiroga Souki9, Raildo da Silva Coqueiro10, Lucia Helena Soares Cevidanes11. 1. Associate professor, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; Brazilian National Counsel of Technological and Scientific Development (CNPq) researcher, postdoctoral fellow, School of Dentistry, University of Michigan, Ann Arbor, Mich. Electronic address: antonioruellas@yahoo.com.br. 2. Postgraduate student, University of São Paulo, São Paulo, Brazil; visiting student, School of Dentistry, University of Michigan, Ann Arbor, Mich. 3. Postgraduate student, Araraquara Dental School, Paulista State University, Araraquara, São Paulo, Brazil. 4. Postgraduate student, Bauru Dental School, University of São Paulo, Bauru, Brazil. 5. Graduate student, School of Chemistry Electronics and Telecommunications, Lyon, France; intern, School of Dentistry, University of Michigan, Ann Arbor, Mich. 6. Associate professor, Department of Pediatric Dentistry, Araraquara Dental School, Paulista State University, Araraquara, São Paulo, Brazil. 7. Associate professor, Bauru Dental School and Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Bauru, Brazil. 8. Associate professor, Department of Plastic Surgery, University of São Paulo, Brazilian National Counsel of Technological and Scientific Development (CNPq) researcher. São Paulo, Brazil. 9. Associate professor, Graduate Program in Orthodontics, Pontifical Catholic University of Minas Gerais, Belo Horizonte, Brazil. 10. Assistant professor, Department of Health, Southwest Bahia State University, Jequié, Bahia, Brazil. 11. Assistant professor, Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, Mich.
Abstract
INTRODUCTION: The aims of this study were to evaluate how head orientation interferes with the amounts of directional change in 3-dimensional (3D) space and to propose a method to obtain a common coordinate system using 3D surface models. METHODS: Three-dimensional volumetric label maps were built for pretreatment (T1) and posttreatment (T2) from cone-beam computed tomography images of 30 growing subjects. Seven landmarks were labeled in all T1 and T2 volumetric label maps. Registrations of T1 and T2 images relative to the cranial base were performed, and 3D surface models were generated. All T1 surface models were moved by orienting the Frankfort horizontal, midsagittal, and transporionic planes to match the axial, sagittal, and coronal planes, respectively, at a common coordinate system in the Slicer software (open-source, version 4.3.1; http://www.slicer.org). The matrix generated for each T1 model was applied to each corresponding registered T2 surface model, obtaining a common head orientation. The 3D differences between the T1 and registered T2 models, and the amounts of directional change in each plane of the 3D space, were quantified for before and after head orientation. Two assessments were performed: (1) at 1 time point (mandibular width and length), and (2) for longitudinal changes (maxillary and mandibular differences). The differences between measurements before and after head orientation were quantified. Statistical analysis was performed by evaluating the means and standard deviations with paired t tests (mandibular width and length) and Wilcoxon tests (longitudinal changes). For 16 subjects, 2 observers working independently performed the head orientations twice with a 1-week interval between them. Intraclass correlation coefficients and the Bland-Altman method tested intraobserver and interobserver agreements of the x, y, and z coordinates for 7 landmarks. RESULTS: The 3D differences were not affected by the head orientation. The amounts of directional change in each plane of 3D space at 1 time point were strongly influenced by head orientation. The longitudinal changes in each plane of 3D space showed differences smaller than 0.5 mm. Excellent intraobserver and interobserver repeatability and reproducibility (>99%) were observed. CONCLUSIONS: The amount of directional change in each plane of 3D space is strongly influenced by head orientation. The proposed method of head orientation to obtain a common 3D coordinate system is reproducible.
INTRODUCTION: The aims of this study were to evaluate how head orientation interferes with the amounts of directional change in 3-dimensional (3D) space and to propose a method to obtain a common coordinate system using 3D surface models. METHODS: Three-dimensional volumetric label maps were built for pretreatment (T1) and posttreatment (T2) from cone-beam computed tomography images of 30 growing subjects. Seven landmarks were labeled in all T1 and T2 volumetric label maps. Registrations of T1 and T2 images relative to the cranial base were performed, and 3D surface models were generated. All T1 surface models were moved by orienting the Frankfort horizontal, midsagittal, and transporionic planes to match the axial, sagittal, and coronal planes, respectively, at a common coordinate system in the Slicer software (open-source, version 4.3.1; http://www.slicer.org). The matrix generated for each T1 model was applied to each corresponding registered T2 surface model, obtaining a common head orientation. The 3D differences between the T1 and registered T2 models, and the amounts of directional change in each plane of the 3D space, were quantified for before and after head orientation. Two assessments were performed: (1) at 1 time point (mandibular width and length), and (2) for longitudinal changes (maxillary and mandibular differences). The differences between measurements before and after head orientation were quantified. Statistical analysis was performed by evaluating the means and standard deviations with paired t tests (mandibular width and length) and Wilcoxon tests (longitudinal changes). For 16 subjects, 2 observers working independently performed the head orientations twice with a 1-week interval between them. Intraclass correlation coefficients and the Bland-Altman method tested intraobserver and interobserver agreements of the x, y, and z coordinates for 7 landmarks. RESULTS: The 3D differences were not affected by the head orientation. The amounts of directional change in each plane of 3D space at 1 time point were strongly influenced by head orientation. The longitudinal changes in each plane of 3D space showed differences smaller than 0.5 mm. Excellent intraobserver and interobserver repeatability and reproducibility (>99%) were observed. CONCLUSIONS: The amount of directional change in each plane of 3D space is strongly influenced by head orientation. The proposed method of head orientation to obtain a common 3D coordinate system is reproducible.
Authors: Amr Ragab El-Beialy; Mona Salah Fayed; Ahmed Mohammed El-Bialy; Yehya A Mostafa Journal: Am J Orthod Dentofacial Orthop Date: 2011-08 Impact factor: 2.650
Authors: Lucia H C Cevidanes; Gavin Heymann; Marie A Cornelis; Hugo J DeClerck; J F Camilla Tulloch Journal: Am J Orthod Dentofacial Orthop Date: 2009-07 Impact factor: 2.650
Authors: F Angelieri; A C Ruellas; M S Yatabe; L H S Cevidanes; L Franchi; C Toyama-Hino; H J De Clerck; T Nguyen; J A McNamara Journal: Orthod Craniofac Res Date: 2017-06-29 Impact factor: 1.826
Authors: J T Zupnik; M Ioshida; M Yatabe; A C O Ruellas; L R Gomes; S Aronovich; E Benavides; S P Edwards; B Paniagua; L H S Cevidanes Journal: Int J Oral Maxillofac Surg Date: 2019-02-01 Impact factor: 2.789
Authors: Yu-Jen Chang; Antônio C O Ruellas; Marilia S Yatabe; Philip M Westgate; Lucia H S Cevidanes; Sarandeep S Huja Journal: J Oral Maxillofac Surg Date: 2017-05-24 Impact factor: 1.895
Authors: Cristiano Tonello; Lucia H S Cevidanes; Antonio C O Ruellas; Nivaldo Alonso Journal: J Craniofac Surg Date: 2021 Jan-Feb 01 Impact factor: 1.046
Authors: Robert Y Wei; Arjun Atresh; Antonio Ruellas; Lucia H S Cevidanes; Tung Nguyen; Brent E Larson; Jonathan E Mangum; David J Manton; Paul M Schneider Journal: Am J Orthod Dentofacial Orthop Date: 2020-08-20 Impact factor: 2.650
Authors: Kyle L Taylor; Karine Evangelista; Luciana Muniz; Antônio Carlos de Oliveira Ruellas; José Valladares-Neto; James McNamara; Lorenzo Franchi; Hera Kim-Berman; Lucia Helena Soares Cevidanes Journal: Orthod Craniofac Res Date: 2019-10-10 Impact factor: 1.826
Authors: Marília Yatabe; Daniela Gamba Garib; Renato André de Souza Faco; Hugo de Clerck; Guilherme Janson; Tung Nguyen; Lucia Helena Soares Cevidanes; Antonio Carlos Ruellas Journal: Am J Orthod Dentofacial Orthop Date: 2017-09 Impact factor: 2.650