Dentoskeletal changes in Class II malocclusion patients after treatment with the Twin Block functional appliance

Ione Helena Vieira Portella BRUNHARO, Cátia Abdo QUINTÃO, Marco Antonio de Oliveira ALMEIDA, Alexandre MOTTA, Sunny Yamaguche Nogueira BARRETO

Objective: This prospective clinical study evaluated dentoskeletal changes in Class II malocclusion patients after treatment with the Twin Block functional appliance. Methods: The treatment group consisted of 19 subjects (mean age 9.5 years) and the control group consisted of 19 subjects (mean age 9.9 years) situated before pubertal growth spurt. Unpaired Student?s t test showed the sample homogeneity at the beginning of the study. Initial (T1) and one year follow-up (T2) cephalometric radiographs were obtained for all subjects. Wilcoxon test and Mann Whitney test were used to evaluate changes intra and inter groups from T1 to T2. Results: A Class I molar relationship was achieved in 15 subjects of the treated group while no modification occurred in the control group. No significant effect was observed either in the maxilla or in the vertical pattern. A significant increase in total mandibular length and an anterior displacement of the mandibular position occurred in the treated group (p<0.05) as well as an overjet reduction, influenced by significant upper incisor retroclination and lower incisor proclination (p<0.05). Conclusions: Class II treatment with the Twin Block appliance in Brazilian patients showed skeletal and dental effects, including increase in mandibular length and incisors compensation, respectively.

Keywords: Class II malocclusion. Functional appliance. Growth.

How to cite: Brunharo IHVP, Quintão CA, Almeida MAO, Motta A, Barreto SYN. Alterações dentoesqueléticas decorrentes do tratamento com aparelho ortopédico funcional Twin Block em pacientes portadores de má oclusão de Classe II esquelética. Dental Press J Orthod. 2011 Sept-Oct;16(5):40-2.

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