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Three-Dimensional Analysis of Maxillary Changes Associated with Facemask and Rapid Maxillary Expansion Compared with Bone Anchored Maxillary Protraction

Institution:
1Special Studies in Orthodontics, São Paulo Military Hospital, São Paulo, Brazil.
2Department of Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, MI, USA.
3Department of Orthodontics, University of North Carolina, Chapel Hill, NC, USA.
4Department of Orthodontics, University of Florence, Florence, Italy.
Publisher:
Elsevier Science
Publication Date:
Nov-2013
Journal:
Am J Orthod Dentofacial Orthop
Volume Number:
144
Issue Number:
5
Pages:
705-14
Citation:
Am J Orthod Dentofacial Orthop. 2013 Nov;144(5):705-14.
PubMed ID:
24182587
PMCID:
PMC3972125
Appears in Collections:
NA-MIC
Sponsors:
R01 DE005215/DE/NIDCR NIH HHS/United States
R01 DE024450/DE/NIDCR NIH HHS/United States
U54 EB005149/EB/NIBIB NIH HHS/United States
Generated Citation:
Hino C.T., Cevidanes L.H., Nguyen T.T., De Clerck H.J., Franchi L., McNamara J.A. Three-Dimensional Analysis of Maxillary Changes Associated with Facemask and Rapid Maxillary Expansion Compared with Bone Anchored Maxillary Protraction. Am J Orthod Dentofacial Orthop. 2013 Nov;144(5):705-14. PMID: 24182587. PMCID: PMC3972125.
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Our objectives in this study were to evaluate in 3 dimensions the growth and treatment effects on the midface and the maxillary dentition produced by facemask therapy in association with rapid maxillary expansion (RME/FM) compared with bone-anchored maxillary protraction (BAMP). METHODS: Forty-six patients with Class III malocclusion were treated with either RME/FM (n = 21) or BAMP (n = 25). Three-dimensional models generated from cone-beam computed tomographic scans, taken before and after approximately 1 year of treatment, were registered on the anterior cranial base and measured using color-coded maps and semitransparent overlays. RESULTS: The skeletal changes in the maxilla and the right and left zygomas were on average 2.6 mm in the RME/FM group and 3.7 mm in the BAMP group; these were different statistically. Seven RME/FM patients and 4 BAMP patients had a predominantly vertical displacement of the maxilla. The dental changes at the maxillary incisors were on average 3.2 mm in the RME/FM group and 4.3 mm in the BAMP group. Ten RME/FM patients had greater dental compensations than skeletal changes. CONCLUSIONS: This 3-dimensional study shows that orthopedic changes can be obtained with both RME/FM and BAMP treatments, with protraction of the maxilla and the zygomas. Approximately half of the RME/FM patients had greater dental than skeletal changes, and a third of the RME/FM compared with 17% of the BAMP patients had a predominantly vertical maxillary displacement.

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