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Doctoral Thesis
Full name
Ana Liesel Guggiari Niederberger
Knowledge Area
Date of Defense
Bauru, 2018
Janson, Guilherme dos Reis Pereira (President)
Henriques, Jose Fernando Castanha
Siqueira, Danilo Furquim
Souza, José Eduardo Prado de
Title in English
Stability of nonextraction Class II malocclusion treatment with elastics
Keywords in English
Intermaxillary elastics
Malocclusion, Angle Class II
Abstract in English
The objective of this study was to evaluate the long-term stability after successful nonextraction Class II malocclusion treatment with elastics. A sample of 43 patients with Class II malocclusion was divided into two groups. The elastic group (EG) consisted of 20 patients who were treated with fixed appliances associated with Class II elastics. The headgear group (HG), consisted of 23 patients treated with fixed appliances and extraoral headgear. Pre-, post-treatment, and long-term post-treatment lateral radiographs and dental casts were evaluated. T-tests were used to compare the treatment changes and long-term post-treatment changes between the groups. The groups were matched regarding initial age, time of long-term post-treatment evaluation, initial malocclusion severity, quality of treatment result, and all pretreatment cephalometric variables. Patients of the EG presented greater treatment time, were older at the post-treatment and at the long-term post-treatment evaluation stages. During treatment both groups showed similar changes. Intergroup comparisons of long-term post-treatment changes showed slight mandibular retrusion in the EG and mandibular protrusion in the HG. The maxillary molar showed significant mesialization in the HG group. There were no intergroup significant occlusal differences during the long-term post-treatment period, with exception of the overjet, which maintained stable in the EG and showed improvement in the HG group. Nonextraction Class II malocclusion treatment with elastics or with extraoral headgear have similar long-term post-treatment stability.
Title in Portuguese
Avaliação da estabilidade do tratamento da má oclusão de Classe II sem extrações com uso de elásticos
Keywords in Portuguese
Elásticos intermaxilares
Má oclusão de Angle Classe II
Abstract in Portuguese
O objetivo do presente estudo foi avaliar a estabilidade do tratamento sem extrações da má oclusão de Classe II com elásticos. Uma amostra de 43 pacientes com má oclusão de Classe II foi dividida em dois grupos. O grupo elástico (GE) consistiu em 20 pacientes que foram tratados com aparelho fixo associado a elásticos de Classe II. O grupo controle (GC), consistiu em 23 pacientes tratados com aparelho fixo associado ao aparelho extrabucal. Telerradiografias e modelos iniciais (T1), finais (T2) e pós-tratamento (T3) foram avaliados. Os grupos foram compativéis em relação à idade inicial, tempo de avaliação pós-tratamento, severidade inicial da má oclusão, qualidade do resultado do tratamento e em relação às variáveis cefalométricas prétratamento. Os pacientes do GE apresentaram maior tempo de tratamento, e maior idade ao final e no pós-tratamento. Após o tratamento, ambos os grupos apresentaram alterações semelhantes. Com respeito as alterações no periodo póstratamento, no GE, a mandíbula se mostrou ligeiramente retruida e no GC ocorreu uma ligeira protrusão. Em relação às variáveis dentoalveolares, o molar maxilar mostrou mesialização significativa no GC. Não houve diferenças entre os grupos em relação às alterações oclusais no periodo pós-tratamento, com exceção do overjet, que manteve-se estável no GE e mostrou melhoras no GC. A estabilidade do tratamento de má oclusão de Classe II com elásticos ou com aparelho extrabucal é semelhante.
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