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

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). This retrospective study was performed with 132 lateral cephalograms of patients with Class I...

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Published inAmerican journal of orthodontics and dentofacial orthopedics Vol. 163; no. 2; pp. 181 - 190
Main Authors Bastiani, Cristina, Bellini-Pereira, Silvio Augusto, Aliaga-Del Castillo, Aron, Chiqueto, Kelly, Castanha Henriques, José Fernando, Janson, Guilherme
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 01.02.2023
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ISSN0889-5406
1097-6752
1097-6752
DOI10.1016/j.ajodo.2021.09.021

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Summary: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). 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. 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. 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. •This study assessed the Twin-block and MARA devices for Class II malocclusion treatment.•Treatment changes (T2 − T1) during the functional appliances were compared.•The appliances were effective in changing Class II cephalometric parameters.•MARA devices produced greater labial tipping and protrusion of the mandibular incisors.
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ISSN:0889-5406
1097-6752
1097-6752
DOI:10.1016/j.ajodo.2021.09.021