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Abstract

The aims of this retrospective cephalometric study were to assess the results of presurgical treatment on the subjects presenting with Class III malocclusion and to evaluate the correlation between soft and hard tissues. Initial (T0) and presurgical (T1) lateral cephalograms of 17 patients were examined. Mean age was 20.4 years initially. Subjects were treated with presurgical orthodontic treatment. Initial and presurgical variables were compared using paired t-test, and the relationship of soft and hard tissue variables was studied using Pearson correlation coefficient and linear regression equation. Significant changes were found in hard (U1E 1.4±2.6 mm, FMIA -6.9±6.8°, IMPA 5.8±6.5°, L1E 2.4±2.4 mm) and soft tissue (Li 1.9±1.6 mm, Z-angle -5.0±7.3°). The increase of U1E was correlated with the increase in U1toSN angle and the ratio was 3.77. The increase of L1E was correlated with the increase in IMPA angle and Li, but decrease in Z-angle. The ratios were 3.04, 0.87, and -5.71, respectively. The ratios of soft to hard tissue movements derived from this study would contribute to the database for planning prediction.

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