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- W2507250315 abstract "•We compared the efficiency of symmetric and asymmetric extractions in type 1 Class II subdivision malocclusions. •The efficiency of treatment was similar in both groups. •The group treated with asymmetric extractions had a better occlusal success rate. Introduction In this study, we compared the efficiency of Class II subdivision malocclusion treatment with symmetric and asymmetric extractions. Methods A sample of 71 patients with complete Class II subdivision malocclusion was selected: group 1 consisted of 40 patients treated with 4 premolar extractions with an initial mean age of 13.37 years, and group 2 had 31 patients treated with 3 premolar extractions (2 maxillary premolars and 1 mandibular premolar on the Class I side) with an initial mean age of 14.44 years. To compare the efficiency of each treatment protocol, the initial and final occlusal results were evaluated on dental casts with the Peer Assessment Rating occlusal index, and time spent in treatment was calculated from the clinical charts. The amounts of initial and final midline deviation and improvement of midline deviation correction were also evaluated. Efficiency was calculated as the rate between occlusal improvement by the treatment time. The groups were compared with t and Mann-Whitney tests. Results The results showed that group 2 had a significantly smaller final amount of midline deviation and a greater correction of midline deviation. Conclusions Treatment efficiency of type 1 Class II subdivision malocclusions with 3 or 4 premolar extractions is similar. However, treatment with 3 premolar extractions provides a better occlusal success rate. In this study, we compared the efficiency of Class II subdivision malocclusion treatment with symmetric and asymmetric extractions. A sample of 71 patients with complete Class II subdivision malocclusion was selected: group 1 consisted of 40 patients treated with 4 premolar extractions with an initial mean age of 13.37 years, and group 2 had 31 patients treated with 3 premolar extractions (2 maxillary premolars and 1 mandibular premolar on the Class I side) with an initial mean age of 14.44 years. To compare the efficiency of each treatment protocol, the initial and final occlusal results were evaluated on dental casts with the Peer Assessment Rating occlusal index, and time spent in treatment was calculated from the clinical charts. The amounts of initial and final midline deviation and improvement of midline deviation correction were also evaluated. Efficiency was calculated as the rate between occlusal improvement by the treatment time. The groups were compared with t and Mann-Whitney tests. The results showed that group 2 had a significantly smaller final amount of midline deviation and a greater correction of midline deviation. Treatment efficiency of type 1 Class II subdivision malocclusions with 3 or 4 premolar extractions is similar. However, treatment with 3 premolar extractions provides a better occlusal success rate." @default.
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- W2507250315 date "2016-09-01" @default.
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- W2507250315 title "Efficiency of Class II subdivision malocclusion treatment with 3 and 4 premolar extractions" @default.
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- W2507250315 doi "https://doi.org/10.1016/j.ajodo.2016.02.028" @default.
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