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1Department of Morphology and Pediatric Clinic, School of Dentistry of Araraquara, São Paulo State University, Araraquara, Brazil
2Departments of Oral and Maxillofacial Surgery and Orthodontics, Texas A&M University Health Science Center, Baylor College of Dentistry, Dallas, TX, USA
3Private Practice, Nova Lima, Brazil
4Department of Orthodontics, University of the Pacific, Arthur A. Dugoni School of Dentistry, San Francisco, CA, USA
Objective The number of three-piece maxillary osteotomies has increased over the years; however, the literature remains controversial. The objective of this study was to evaluate the skeletal stability of this surgical modality compared with that of one-piece maxillary osteotomy.
Methods This retrospective cohort study included 39 individuals who underwent Le Fort I maxillary osteotomies and were divided into two groups: group 1 (three pieces, n = 22) and group 2 (one piece, n = 17). Three cone-beam computed tomography scans from each patient (T1, pre-surgical; T2, post-surgical; and T3, follow-up) were used to evaluate the three-dimensional skeletal changes.
Results The differences within groups were statistically significant only for group 1 in terms of surgical changes (T2-T1) with a mean difference in the canine region of 3.09 mm and the posterior region of 3.08 mm. No significant differences in surgical stability were identified between or within the groups. The mean values of the differences between groups were 0.05 mm (posterior region) and –0.39 mm (canine region).
Conclusions Our findings suggest that one- and three-piece maxillary osteotomies result in similar post-surgical skeletal stability.
Figure 2
Example of the Euclidean three-dimensional (3D) distance using two landmarks on a 3D surface. PR measurements within groups. Example: PR T2-PR T1.
T1, pre-surgical; T2, post-surgical; PR, posterior right.
Figure 3
Euclidean three-dimensional distance obtained using two landmarks within the model. Example: posterior right to posterior left.
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