Tung Nguyen1, Lucia Cevidanes2, Lorenzo Franchi3, Antonio Ruellas4, Tate Jackson5. 1. Department of Orthodontics, University of North Carolina, Chapel Hill, NC. Electronic address: tung_nguyen@unc.edu. 2. Department Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, Mich. 3. Department of Surgery and Translational Medicine, University of Florence, Florence, Italy; Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, Mich. 4. School of Dentistry, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. 5. Department of Orthodontics, University of North Carolina, Chapel Hill, NC.
Abstract
INTRODUCTION: The aims of this study were to identify stable mandibular structures in 3 dimensions in growing patients using a regional implant technique and to test the reproducibility of mandibular regional superimposition in 3 dimensions using the regions identified. METHODS: Three-dimensional voxel-based regional mandibular registrations were performed on bone plates, and screws were placed in the anterior chin and symphysis regions of 20 growing patients (mean age, 12.1 ± 1.3 years). Three-dimensional models of the resulting superimpositions were built for the chin, symphysis, and third molar crypts. Absolute mean errors were calculated for each region to evaluate stability. Longitudinal cone-beam computed tomography scans were obtained of 25 patients (mean age, 12.7 ± 1.4 years) with different skeletal malocclusions (20 Class II, 5 Class III). To evaluate reliability of mandibular registrations using the chin and symphysis regions, voxel-based superimpositions were performed independently by 2 observers. The resulting superimpositions between the 2 examiners were overlaid, and the mean difference along the entire surface of the mandible was calculated. RESULTS: The chin and symphysis regions showed high levels of precision (chin absolute mean error, 0.37 ± 0.16 mm; symphysis absolute mean error, 0.4 ± 0.15 mm). The third molar region had a high registration error (absolute mean error, 1.94 ± 0.06 mm). The voxel-based registrations using the chin and symphysis were reliable and reproducible between examiners (absolute mean error, 0.12 ± 1.1 mm). Intraclass correlation coefficient results showed a high degree of agreement between examiners. CONCLUSIONS: The chin and symphysis regions are stable areas for 3-dimensional mandibular regional superimpositions.
INTRODUCTION: The aims of this study were to identify stable mandibular structures in 3 dimensions in growing patients using a regional implant technique and to test the reproducibility of mandibular regional superimposition in 3 dimensions using the regions identified. METHODS: Three-dimensional voxel-based regional mandibular registrations were performed on bone plates, and screws were placed in the anterior chin and symphysis regions of 20 growing patients (mean age, 12.1 ± 1.3 years). Three-dimensional models of the resulting superimpositions were built for the chin, symphysis, and third molar crypts. Absolute mean errors were calculated for each region to evaluate stability. Longitudinal cone-beam computed tomography scans were obtained of 25 patients (mean age, 12.7 ± 1.4 years) with different skeletal malocclusions (20 Class II, 5 Class III). To evaluate reliability of mandibular registrations using the chin and symphysis regions, voxel-based superimpositions were performed independently by 2 observers. The resulting superimpositions between the 2 examiners were overlaid, and the mean difference along the entire surface of the mandible was calculated. RESULTS: The chin and symphysis regions showed high levels of precision (chin absolute mean error, 0.37 ± 0.16 mm; symphysis absolute mean error, 0.4 ± 0.15 mm). The third molar region had a high registration error (absolute mean error, 1.94 ± 0.06 mm). The voxel-based registrations using the chin and symphysis were reliable and reproducible between examiners (absolute mean error, 0.12 ± 1.1 mm). Intraclass correlation coefficient results showed a high degree of agreement between examiners. CONCLUSIONS: The chin and symphysis regions are stable areas for 3-dimensional mandibular regional superimpositions.
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: Luz Victoria Mendoza; Carlos Bellot-Arcís; José María Montiel-Company; Verónica García-Sanz; José Manuel Almerich-Silla; Vanessa Paredes-Gallardo Journal: Sci Rep Date: 2018-08-17 Impact factor: 4.379
Authors: Gui Chen; Mona Al Awadi; David William Chambers; Manuel O Lagravère-Vich; Tianmin Xu; Heesoo Oh Journal: BMC Oral Health Date: 2020-05-27 Impact factor: 2.757