Comparison of relative mandibular growth vectors with high-resolution 3-dimensional imaging

Comparison of relative mandibular growth vectors with high-resolution 3-dimensional imaging

Author Cevidanes, LHS Google Scholar
Franco, A. A. Google Scholar
Gerig, G. Google Scholar
Proffit, W. R. Google Scholar
Slice, D. E. Google Scholar
Enlow, D. H. Google Scholar
Lederman, H. M. Google Scholar
Amorim, L. Google Scholar
Scanavini, M. A. Google Scholar
Vigorito, J. W. Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Univ N Carolina
Wake Forest Univ
Case Western Reserve Univ
Universidade de São Paulo (USP)
Abstract Introduction: the mandibular rami and their endochondrally growing condyles develop in many directions relative to the variable anatomic patterns of the nasomaxilla and middle cranial fossae during growth and response to orthopedic treatment. Methods: High-resolution magnetic resonance images were used to compare 3-climensional (3D) growth vectors of skeletal displacement and bone remodeling in 25 untreated subjects with Class II malocclusions, 28 subjects with Class II malocclusions who were treated with Frankel appliance therapy, and 25 subjects with normal occlusions. Marked differences were noted over an 18-month observation period. the 3D coordinates of anatomic landmarks were registered by Procrustes fit to control for rotation, translation, and scale differences. Results: Compared with untreated Class II and normal-occlusion subjects, the treated group showed highly significant differences in the 3D displacement/remodeling vectors of gonion and pterygo-maxillary fissure relative to condylion and middle cranial fossae bilateral skeletal landmarks, by using both permutation tests (P < .001) and a general linear multivariate model (P < .0001). Conclusions: in a prospective and systematically controlled study, we quantitatively described significant 3D rami skeletal compensations in the structural assembly of facial morphogenesis at the beginning of the adolescent growth spurt using novel modeling techniques. These techniques have facilitated quantification of relative 3D growth vectors to illustrate skeletal changes with Frankel appliance therapy. Future studies are required to assess the long-term clinical significance of our findings.
Language English
Date 2005-07-01
Published in American Journal of Orthodontics and Dentofacial Orthopedics. St Louis: Mosby, Inc, v. 128, n. 1, p. 27-34, 2005.
ISSN 0889-5406 (Sherpa/Romeo, impact factor)
Publisher Mosby, Inc
Extent 27-34
Origin http://dx.doi.org/10.1016/j.ajodo.2004.03.033
Access rights Closed access
Type Article
Web of Science ID WOS:000230524200013
URI http://repositorio.unifesp.br/handle/11600/28367

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