Twin-block and mandibular anterior repositioning appliances effects in Class II malocclusion correction.

Autor: Bastiani C; Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil. Electronic address: crisbastiani@outlook.com.br., Bellini-Pereira SA; Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil., Aliaga-Del Castillo A; Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil; Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Michigan, Ann Arbor, MI, USA., Chiqueto K; Department of Orthodontics, Porto Alegre Dental School, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil., Castanha Henriques JF; Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil., Janson G; Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil.
Jazyk: angličtina
Zdroj: American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics [Am J Orthod Dentofacial Orthop] 2023 Feb; Vol. 163 (2), pp. 181-190. Date of Electronic Publication: 2022 Oct 04.
DOI: 10.1016/j.ajodo.2021.09.021
Abstrakt: Introduction: The objective of this study was to compare the cephalometric changes in Class II Division 1 malocclusion patients treated with the Twin-block (TB) and the mandibular anterior repositioning appliance (MARA).
Methods: This retrospective study was performed with 132 lateral cephalograms of patients with Class II malocclusion divided into 3 groups: a TB group comprised 21 patients with mean initial and final ages of 10.59 and 11.97 years, respectively, treated for a mean period of 1.38 years; a MARA group comprised 21 patients with mean initial and final ages of 11.98 and 13.20 years, respectively, treated for a mean period of 1.22 years; and a control group included 24 subjects with untreated Class II malocclusion with mean initial and final ages of 10.55 and 12.01 years, respectively, observed for a mean period of 1.46 years. Cephalometric intergroup comparisons regarding the treatment changes (T2 - T1) were performed with the analysis of covariance, followed by Tukey tests.
Results: Both appliances demonstrated significant restriction of the maxilla and improvement of the maxillomandibular relationship. The MARA produced a significantly greater amount of labial tipping and protrusion of the mandibular incisors than the other groups. The TB showed significant extrusion of the mandibular incisors and molars compared with MARA and control, respectively. Both treated groups reduced the overjet and overbite. The MARA presented a significantly greater reduction in the molar relationship than the other groups.
Conclusions: The appliances showed a headgear effect on the maxilla and effectively changed Class II cephalometric parameters through a combination of skeletal and dentoalveolar effects. TB showed a greater increase in LAFH. MARA promoted greater labial tipping and protrusion of the mandibular incisors.
(Copyright © 2022 American Association of Orthodontists. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: