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Soft and Hard Tissue Changes after Presurgical Orthodontics in Class Ⅲ Patients

安格列氏三級咬合在術前矯正後軟硬組織的變化

摘要


本研究的目的是以測顱X光片分析安格列氏三級咬合的病患在術前矯正治療後,其軟組織與硬組織的變化。有17位平均20.4歲,預計接受正顎手術的骨性第三級咬合病患,先施予手術前的矯正治療平均10.6個月。經由治療開始前及術前測顱X光片的比較得知:上顎門牙往唇側傾斜,下顎門牙向唇側傾斜,下嘴唇往外突出。相關性審查後並以線性回歸找出軟硬組織移動的比例,得到的結果可以提供臨床預測手術前的矯正治療後軟硬組織的相關變化。

並列摘要


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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