Estudo prospectivo dos efeitos dentoesqueléticos e tegumentares do aparelho Twin-block comparados aos do Bionator e Herbst no tratamento da má oclusão de Classe II com retrognatismo mandibular / Study of dentoskeletal and soft tissue effects of Twin-block appliance compared to Bionator and Herbst effects in the treatment of Class II malocclusion with mandibular retrognathism

AUTOR(ES)

Lucelma Vilela Pieri

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

02/09/2011

RESUMO

This study had as aim to assess the dentoskeletal and soft tissue effects of the Twin-block appliance by means of 42 lateral cephalometric radiographs obtained in T1, before treatment, and T2, at the end of the orthopedic treatment, of 21 Brazilian subjects of both genders, mean age of 10.5 years, minimum: 9.25 years; maximum: 12.5 years with Class II malocclusion associated to a mandibular retrognathism treated in the Orthodontic Discipline at Bauru Dental School, University of Sao Paulo and compared to three samples with the same features with the functional appliances, Bionator (22 subjects, 10.42 years, minimum: 8.08 years; maximum:12.58 years), Herbst (22 subjects, 10.48 years; minimum: 8.00; maximum:12.75 years) and an untreated Class II control group (24 subjects, 9.97 years, minimum: 8.33 years; maximum: 11.67 years) in a total of 178 lateral cephalometric radiographs. All patients were in the same cervical vertebral maturation stages (initial: CVMSII; final: CVMSIII). Analysis of Variance (ANOVA) , Tukey test and pared t test were applied. The results showed that all appliances corrected the maxillomandibular relationship, dental relationships reducing the Class II malocclusion severity with more skeletal effects, significant mandibular protrusion, mandibular growth, body and ramus, with Twin-block and Bionator, respectively, and more dentoalveolar effects with Herbst appliance, with significant protrusion and vestibular inclination of the lower incisors.

ASSUNTO(S)

avanço mandibular crescimento growth má oclusão maloclusion mandibular advancement

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