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• W3080351372 abstract "•Anterior tooth alignment and dental arch dimensions were evaluated 37 years after treatment. •Changes were compared in extraction and nonextraction patients. •After 37 years, there was no difference in the amount of change between groups. •The percentage of mandibular tooth alignment change was greater in the nonextraction group. •Mandibular arch perimeter decreased more than in the extraction group. Introduction The objective of this research was to evaluate the anterior tooth alignment and dental arch dimension changes after orthodontic treatments with and without premolar extractions in the long-term. Methods Fifty-seven patients with Class I and Class II malocclusion were divided into 2 groups. Group 1 included 16 patients treated with nonextraction therapy, with mean initial (T1), final (T2), and long-term follow-up (T3) ages of 13.20 years, 15.07 years, and 50.32 years, respectively. The mean treatment (T2 − T1) and long-term follow-up (T3 − T2) times were 1.86 years and 35.25 years, respectively. Group 2 included 41 patients treated with extraction of 4 first premolars, with T1, T2, and T3 ages of 13.31 years, 15.63 years, and 53.60 years, respectively. The mean treatment and long-term follow-up times were 2.32 years and 37.96 years, respectively. The mean retention time was 2.26 years for both groups. The dental casts were obtained and digitized at T1, T2, and T3 stages. The following measurements were obtained: Little irregularity index, arch length, perimeter, and intercanine, interpremolar, and intermolar widths. Intragroup and intergroup comparisons were performed with repeated measures analysis of variance and t tests, respectively. Results Anterior tooth irregularity index increased at T3 in both groups. In addition, all arch dimensions, except the intercanine width, were significantly smaller in the extraction group at T3. Both groups showed similar arch dimension changes at T3, except for the mandibular arch perimeter. The percentage of mandibular anterior tooth alignment change was significantly greater in the nonextraction than in the extraction group. Conclusions There was no difference in the changes of anterior alignment and transverse arch dimensions in patients treated with and without premolar extraction at T3, but the percentage of mandibular anterior tooth alignment changes was higher in the nonextraction than in the extraction patients at T3. The mandibular arch perimeter showed more of a decrease at T3 in extraction patients." @default.
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• W3080351372 date "2020-10-01" @default.
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• W3080351372 title "Anterior tooth alignment and arch dimensions changes: 37-year follow-up in patients treated with and without premolar extraction" @default.
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• W3080351372 doi "https://doi.org/10.1016/j.ajodo.2020.07.013" @default.
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