骨性Ⅲ类BSSRO术后舌骨舌体的三维位置改变

Changes in Hyoid and Tongue in Patients with Skeletal Class Ⅲ Malocclusion after BSSRO

目的:比较双侧下颌升支矢状劈开术(BSSRO)治疗骨性Ⅲ类患者术前术后舌骨的三维位置改变。方法:选取21例患者,对39个测量项目进行配对t检验分析舌骨,舌体三维位置改变。结果:H1-X、H2-X,GR-X、GL-X,TB-X较术前增大(P<0.05),H1-Z、H2-Z减小(P<0.05),舌骨角1,舌骨角2变化显著(P<0.05)。结论:BSSRO术后1个月舌骨体后下移位,舌骨大角、舌体下降,舌骨发生前上旋转。

Objective： To assess changes in hyoid and tongue in patients with skeletal class Ⅲ malocclusion after bilateral sagittal split ramus osteotomy （BSSRO）. Methods： 21 patients and 39 Measurements with skeletal ClassⅢ malocclusion were evaluated. The change of distances from hyoid bone ,tongue and mandible to reference frame were analyzed using paired t- test. Results ： The hyoid bone （ H 1 - X, H2 - X）, Greater horn of the hyoid （GR- X, GL-X） and the tongue （TB-X） were increased significantly. The hyoid bone （HI-Z, H2-Z） were decreased significantly. The angle 1 of hyoid decreased and 2 increased significantly. Conclusion： The hyoid significantly moved backward and downward . Greater horn of the hyoid and the tongue significantly moved down. The hyoid sig nificantly changes inclined toward up and forward.