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Three-dimensional Regional Displacements after Mandibular Advancement Surgery: One Year of Follow-up

Department of Orthodontics, Fluminense Federal University School of Dentistry, Rio de Janeiro, Brazil.
Elsevier Science
Publication Date:
J Oral Maxillofac Surg
Volume Number:
Issue Number:
J Oral Maxillofac Surg. 2011 May;69(5):1447-57.
PubMed ID:
Appears in Collections:
K23 DE017727/DE/NIDCR NIH HHS/United States
R01 DE005215/DE/NIDCR NIH HHS/United States
R03 DE018962/DE/NIDCR NIH HHS/United States
U54 EB005149/EB/NIBIB NIH HHS/United States
Generated Citation:
da Motta A., Cevidanes L.H., Carvalho F., Almeida M., Phillips C. Three-dimensional Regional Displacements after Mandibular Advancement Surgery: One Year of Follow-up. J Oral Maxillofac Surg. 2011 May;69(5):1447-57. PMID: 21256643. PMCID: PMC3079797.
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To evaluate the association of 3-dimensional changes in the position of the condyles, rami, and chin at splint removal and 1 year after mandibular advancement surgery. PATIENTS AND METHODS: This prospective observational study used preoperative and postoperative scans of 27 subjects presenting with a skeletal Class II jaw relationship with a normal or deep overbite. An automatic technique of cranial base superimposition was used to assess the positional and/or remodeling changes in the anatomic regions of interest. The displacements were visually displayed and quantified using 3-dimensional color maps. The positive and negative values of surface distances in the color maps indicated the direction of the displacements. Pearson correlation coefficients and a linear model for correlated data were used to evaluate the association between the regional displacements. RESULTS: The postoperative adaptations in the chin position between splint removal and 1 year after surgery were significantly negatively correlated with changes in the borders of the posterior ramus (left, r = -0.73, P ≤ .0001; and right, r = -0.68, P = .00) and the condyles (left, r = -0.53, P = .01; and right, r = -0.46, P = .02), indicating that these structures tended to be displaced in the same direction. Even though the mean condylar displacement with surgery was less than 1 mm, individual displacements greater than 2 mm with surgery were observed for 24% of the condyles. The condylar displacements were maintained at 1 year after surgery for 17% of the condyles. CONCLUSIONS: The surface distance displacements indicated that the postoperative adaptations at different anatomic regions were significantly related.

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