Abstract
OBJETIVO: avaliar cefalometricamente as alterações tegumentares e dentoalveolares em jovens brasileiros portadores de má oclusão de Classe II, 1ª divisão, tratados com APM associado à Ortodontia corretiva fixa. MÉTODOS: a amostra consistiu-se de 28 pacientes (16 do sexo feminino e 12 do sexo masculino), com idade média de 13,06 anos, tratados por um período médio de 14,43 meses. As alterações foram medidas em 56 cefalogramas específicos, obtidos das telerradiografias laterais feitas antes e após o tratamento, por dois examinadores calibrados para identificar as alterações tegumentares e dentoalveolares, utilizando-se grandezas cefalométricas lineares e angulares. As variáveis independentes (sexo, idade, padrão facial, tipo de APM, arco, técnica e tempo de tratamento) foram consideradas e analisadas com as grandezas cefalométricas lineares e angulares. As respostas ao tratamento foram analisadas e comparadas pelos testes Wilcoxon Signed Ranks e Mann-Whitney para um nível de significância de 5%. RESULTADOS: os resultados mostraram mudanças dentoalveolares de grande magnitude, provocando, assim, mudanças favoráveis no tecido mole. Observou-se, ainda, que as variáveis idade, tipo de APM e técnica utilizada influenciaram no tratamento. CONCLUSÕES: o APM mostrou-se uma alternativa eficaz para o tratamento da má oclusão de Classe II, 1ª divisão, propiciando alterações dentoalveolares e tegumentares com resultados clínicos satisfatórios.
Highlights
Cephalometric evaluation of the effects of a mandibular protraction appliance (MPA) combined with fixed orthodontic appliance on dentoalveolar and soft tissue structures of Class II, division 1 patients. This is an uncontrolled, non-randomized clinical trial conducted on a sample comprising 56 lateral cephalograms (28 initial and 28 final cephalograms) of 28 Brazilian patients with Angle Class II, Division 1 malocclusion, 12 males and 16 females, mean age of 13.06 years at the beginning of treatment, who were treated for a mean period of 14.43 months with mandibular protraction appliances (MPA) associated with fixed orthodontic appliance
A clinical form was used for data collection including seven variables: Patient age, sex, facial pattern, MPA model, total time of appliance usage, archwires used during treatment with MPA (0.019 x 0.025in, 0.021 x 0.025-in and 0.018 x 0.025-in stainless steel wires) as well as the orthodontic technique
The dentoalveolar and soft tissue changes induced by the combined use of MPA and a fixed orthodontic appliance were evaluated in 28 patients with Class II, Division 1 malocclusion with mean age of 13.06 years, treated for a mean period of 14.43 months (53.6%)
Summary
This is an uncontrolled, non-randomized clinical trial conducted on a sample comprising 56 lateral cephalograms (28 initial and 28 final cephalograms) of 28 Brazilian patients with Angle Class II, Division 1 malocclusion, 12 males and 16 females, mean age of 13.06 years at the beginning of treatment, who were treated for a mean period of 14.43 months with mandibular protraction appliances (MPA) associated with fixed orthodontic appliance. The following inclusion criteria were adopted: Angle Class II, Division 1 malocclusion with mandibular retrognathism, as assessed by photographs, study models, in addition to cephalograms that allowed clear visualization of the structures of interest. All radiographs used in this study were obtained with a Funk Orbital X15 X-ray device, with a magnification factor of 9%, by the same operator
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