Radiographic evaluation of the behavior of lower third molars in patients that were orthodontically treated with and without first premolars extractions

Reinaldo Roberto HAUY, Osmar Aparecido CUOGHI, Marcos Rogério de MENDONÇA

Aim: The aim of this study is to evaluate the positional changes occurred with lower third molars in patients treated orthodontically with extractions of first premolars. Methods: A total of 80 panoramic radiographs obtained at pre and post-treatment periods from 40 patients, were divided into 2 groups: group 1 were composed by 20 patients (13 female and 7 male) that were submitted to orthodontic treatment with extraction of first premolars; group 2 were composed by 20 patients (13 female and 7 male) that were submitted to orthodontic treatment without extractions. Angular measurements were established to evaluate the tipping and linear measurements were established to analyze the vertical changes of the lower third molars. All data were measured twice and averaged, then submitted to paired and unpaired test. Results: Significant differences were found between the initial and final angular measurements of group 1 (p<0.01). Conclusions: It was concluded that similar vertical changes of lower third molars occurred when extraction and non-extraction cases were compared, and third lower molars became less tipped with the extractions of lower first p emolars.

Keywords: Tooth movement. Third molar. Tooth extractions.

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