【摘要】 目的:通过头影测量分析研究经正畸正颌联合治疗的骨性Ⅲ类错畸形经术前正畸后矢状向前牙去代偿情况,分析总结骨性Ⅲ类错牙畸形的术前正畸治疗特点和限度。方法:回顾性研究正畸正颌联合治疗的骨性Ⅲ类患者15例(男10例,女5例),其中上颌拔除双尖牙治疗10例,不拔牙治疗5例(不包括拔除第三磨牙)。治疗前及术前正畸后,拍摄头颅侧位片进行测量,分析比较前牙去代偿情况。结果:经过术前正畸治疗,正畸-正颌联合治疗的骨性Ⅲ类患者骨性方面垂直向和矢状向的关系没有明显变化。在牙性方面,下前牙平均唇向移动8.26°(L1-MP),去代偿有明显变化(P<0.001)。上前牙平均舌向直立2.70°(U1-SN),去代偿有显著性差异(P<0.05)。经术前正畸去代偿后U1-SN角度达正常值范围,L1-MP角度未达到正常值范围。结论:骨性Ⅲ类错畸形术前正畸可以部分去除矢状向前牙代偿,去代偿的程度与限度要考虑多种因素的影响。更多还原

【Abstract】 Objective To evaluate the effect of saggital decompensation in surgical skeletal Class III patients by lateral Cephalometric films,and analyze the limit and features of the treatment. Methods The study included 15 skeletal class Ⅲ subjects(male10,female5) treated with orthodontic-orthognathic surgical treatment.10 of the subjects were treated by maxillary premolar extraction,5 of the subjects by non-extraction(not including third molar extraction).Lateral cephalograms were taken before treatment,after presurgical orthodontic treatment for each patient.And evaluate the amount of decompensation of the incisors before orthognathic surgery. Results After presurgical orthodontics, the skeletal relationships in sagittal and vertical were not changed. Significant proclination of the mandibular incisors was shown after decompensation(P<0.001;L1-MP,8.26°).The upper incisors were lingually proclined by 2.70°,it showed statistically significant change(U1-SN,P <0.05).After the preoperative orthodontic treatment,Compensation of mandibular anterior teeth still exist. Conclusion Presurgical orthodontic treatment can partially remove the saggital compensation of the anterior teeth. The extent and the limit of decompentation were decided by many factors. The presence of necessary to completely remove the compensatory is worth further discussion and research.更多还原