Avaliação do tempo e do grau de eficiência do tratamento da má oclusão de classe I realizado com e sem extrações de pré-molares / Evaluation of time and efficiency of Class I malocclusion treatment carried out with and without premolar extractions

AUTOR(ES)

Ruben Leon Salazar

DATA DE PUBLICAÇÃO

2009

RESUMO

The objective of this retrospective study was to compare the occlusal outcomes, duration and efficiency of the treatment of Class I malocclusions carried out with and without premolar extractions. Accordingly, initial and final clinical charts and models of patients treated with fixed edgewise appliances were selected from the files of the Orthodontic Department at Bauru Dental School. Complete records of 111 patients were obtained and then divided into two groups: Group 1 consisted of 65 patients (24 male, 41 female), at an initial mean age of 13.82 years (range, 10.69 to 22.04 years) treated with four premolar extractions. Group 2 consisted of 46 patients (16 male; 30 female), at an initial mean age of 14.01 years (range, 11.04 to 21.54 years) treated without extractions. Initial and final occlusal evaluations were accomplished in study models of the patients using the peer assessment rating (PAR) index. Compatibility was evaluated with Chi-Square and t tests. The occlusal outcome, treatment duration and efficiency of the groups were also compared with t test and the variables that may be related to the duration of treatment were evaluated using the multiple linear regression analyses. Results showed that both groups had similar final occlusal outcomes and PAR reduction, however, Group 2 showed a significantly smaller treatment time and greater treatment efficiency index than group 1. In the regression analysis, the 9 selected variables explained 15% of the variance in treatment time and the extraction treatment protocol was the only statistically significant variable which was positively associated with treatment time. It can be concluded that premolar extractions influence significantly in treatment duration of Class I malocclusions and the use of this protocol provides the same occlusal outcome and occlusal improvement in a greater time and consequently less efficiency degree than non-extraction protocol.

ASSUNTO(S)

efficiency eficiência ortodontia classe i má oclusão resultado oclusal malocclusion orthodontics occlusal outcome class i

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