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Use of Shape Correspondence Analysis to Quantify Skeletal Changes Associated with Bone-anchored Class III Correction

Department of Orthodontics, University of North Carolina, Chapel Hill, NC, USA.
Allen Press, Inc.
Publication Date:
Angle Orthod
Volume Number:
Issue Number:
Angle Orthod. 2014 Mar;84(2):329-36.
PubMed ID:
Skeletal anchorage, Class III, Growth modification, Bone anchor, 3D
Appears in Collections:
R01 DE005215/DE/NIDCR NIH HHS/United States
U54 EB005149/EB/NIBIB NIH HHS/United States
Generated Citation:
Nguyen T., Cevidanes L.H., Paniagua B., Zhu H., Koerich de Paula L., De Clerck H. Use of Shape Correspondence Analysis to Quantify Skeletal Changes Associated with Bone-anchored Class III Correction. Angle Orthod. 2014 Mar;84(2):329-36. PMID: 23886012. PMCID: PMC4394197.
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OBJECTIVE: To evaluate the three-dimensional (3D) skeletal changes in the mandibles of Class III patients treated with bone-anchored maxillary protraction using shape correspondence analysis. MATERIAL AND METHOD: Twenty-five consecutive patients with skeletal Class III who were between the ages of 9 and 13 years (mean age, 11.10 ± 1.1 years) were treated using Class III intermaxillary elastics and bilateral miniplates (two in the infrazygomatic crests of the maxilla and two in the anterior mandible). Cone-beam computed tomography (CBCT) was performed for each patient before initial loading (T1) and at 1 year out (T2). From the CBCT scans, 3D models were generated, registered on the anterior cranial base, and analyzed using 3D linear distances and vectors between corresponding point-based surfaces. RESULTS: Bone-anchored traction produced anteroposterior and vertical skeletal changes in the mandible. The novel application of Shape correspondence analysis showed vectors of mean (± standard deviation) distal displacement of the posterior ramus of 3.6 ± 1.4 mm, while the chin displaced backward by 0.5 ± 3.92 mm. The lower border of the mandible at the menton region was displaced downward by 2.6 ± 1.2 mm, and the lower border at the gonial region moved downward by 3.6 ± 1.4 mm. There was a downward and backward displacement around the gonial region with a mean closure of the gonial angle by 2.1°. The condyles were displaced distally by a mean of 2.6 ± 1.5 mm, and there were three distinct patterns for displacement: 44% backward, 40% backward and downward, and 16% backward and upward. CONCLUSION: This treatment approach induces favorable control of the mandibular growth pattern and can be used to treat patients with components of mandibular prognathism.

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