Splint纠正CR—CO不调时对下颌骨位置的影响

目的：研究Splint在纠正CR-CO不调时对下颌骨位置变化的影响，为正畸治疗前正确的诊断和治疗提供参考。方法：随机选取门诊戴用Splint治疗的患者23例，在其治疗前后拍摄头颅定位侧位片，应用Jarabak分析法测量并进行统计学分析。结果：患者戴用Splint治疗后，出现下颌后缩，面下1／3变长；口内表现为前牙覆盖变大，覆牙合变浅或者开牙合，可见早接触点；前后头影测量结果比较显示N—Go-Me显著增加（P〈0．05），后面高／前面高、S-Ar-Go和N—Go-Me较治疗前显著减小（P〈0．05），N—S—Ar和Ar-Go—Me治疗前后无明显差异（P〉0．05）。结论：Splint在纠正CR—CO不调时，同时改变了下颌骨的位置，使下颌骨发生顺时针方向旋转。因此，在正畸治疗之前，应该充分考虑下颌骨可能发生的这种变化，以便更好的确定正畸治疗方案。

The Effect of Splint Treatment on the Position of Mandibular in the Correction of CR-CO Discrepancy

Objective： To study the effect of Splint treatment on the position of mandibular in the correction of CR-CO discrepancy and provide proper reference for correct orthodontic diagnosis and treatment of malocclusion. Methods： 23 patients were selected randomly among outpatients of Splint treatment. Cephalometrics were taken before and after treatment and Jarabak cephalometric analysis was used to measure the differences during the treatment. Results： Mandibular was retracted after Splint treatment and the lower third part of the face became longer. Overjet became deeper and the overbite became shallower（P〈0.05）. After Splint treatment, there was a smaller S-Go/N-Me,Ar-Go-N and S-Ar/Ar-Go （P〈0.05）. However, N-Go-Me after treatment was bigger than that of before treatment. Conclusion： When CR-CO discrepancy was corrected using Splint treatment, the position of mandibular was backwards and turned clockwise. And this should be considered before orthodontic treatment and make a more stable and harmonious CR-CO relation.