细丝片段弓移动尖牙的应用分析

目的　分析细丝片段弓远中移动下颌尖牙的应用效果。方法　选择拔除下颌双侧第一前磨牙、磨牙强支抗病例17例,治疗的头半年内用细丝片段弓远中移动下颌尖牙,下颌切牙进行生理性调整,治疗前、治疗3个月、治疗6个月拍头颅侧位片,取阶段模型,测量结果由SPSS 10·0进行统计分析。结果　半年内下颌磨牙前移、下颌尖牙后移分别为1·14 mm、5·02 mm,LM-MP、SN-MP角无明显改变,LI-NB角减小约9·57°,下颌切牙段由拥挤(-2·55 mm)调整为出现间隙(1·08 mm)。结论　细丝片段弓移动下颌尖牙过程中,后牙支抗稳固,下颌尖牙有效后移,下颌切牙自行向理想治疗位调整。

Analysis of Distalization of Lower Canine by Light-segmented Archwire

OBJECTIVE: To analyze the practical effect of distalization of lower cuspiud by light-segmented archwire. METHODS: 17 cases were selected. In all cases, two lower first bicuspids were extracted and lower molars were designed as reinforced anchorage. In the first half year, lower cuspids were distalized with light-segmented archwire, and lower incisors were in the physiologic drift stage. Before the treatment, three months and six months after the treatment, cephalograms and study models were recorded respectively. The data were analyzed with SPSS 10.0. RESULTS: The distance of mesiolization of the first lower molar was 1.14 mm in half a year. The distance of distalization of the lower cuspid was 5.02 mm in half a year. No significant difference was found in LM-MP and SN-MP angle. LI-NB angle was decreased by 9.57 degrees. Crowding of lower incisors was transferred from -2.55 mm to 1.08 mm. CONCLUSION: During distalization of lower cuspid by light-segmented archwire, anchorage tooth was stable, lower cuspids were distalized effectively, and lower incisors drifted towards the ideal position automatically.