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Use of Shape Correspondence Analysis to Quantify Skeletal Changes Associated with Bone-anchored Class III Correction
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Institution: |
Department of Orthodontics, University of North Carolina, Chapel Hill, NC, USA. |
Publisher: |
Allen Press, Inc. |
Publication Date: |
Mar-2014 |
Journal: |
Angle Orthod |
Volume Number: |
84 |
Issue Number: |
2 |
Pages: |
329-36 |
Citation: |
Angle Orthod. 2014 Mar;84(2):329-36. |
PubMed ID: |
23886012 |
PMCID: |
PMC4394197 |
Keywords: |
Skeletal anchorage, Class III, Growth modification, Bone anchor, 3D |
Appears in Collections: |
NA-MIC |
Sponsors: |
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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