Objective To evaluale ihe clinical use of occlusal Iraclion of residual rool by orlhodonlic LreaLmenL. Methods Ten palienls wilh subgingival fraclured Loolh were Irealed by occlusal Lraclion ihrough fixed orlhodonlic LreaLmenL, followed by prosLhodonLic LreaLmenL. The average LreaLmenL Lime was 4-6 monLhs. The changes of rooL inclinaLion, crown-rooL raLio and Lhe densiLy of alveolar bone were measured by digiLal denLal apical X-rays. Results The LreaLmenL was successful in all 10 paLienLs. The average LracLion disLance was 3. 99mm. The changes of rooL inclinaLion, crown-rooL raLio and Lhe densiLy of alveolar bone were noL significanL after and before LreaLmenL(P >0. 05). Conclusion Occlusal LracLion of subgingival rooL by orthodonLic meLhod is feasible wiLh saLisfacLory resulLs.%目的 探讨一种采用正畸方法(牙合)向牵引龈下牙根后再修复的方法.方法 选择龈下牙折患者8名,共10颗患牙,断端最低处距牙槽嵴顶的距离为1.5~2.0mm.经完善的根管治疗4周后,采用正畸固定矫治技术(牙合)向牵引龈下牙根,平均疗程4~6个月,然后桩冠修复治疗.采用临床检查评价正畸前后牙齿松动度、牙龈形态和牙周状况,并通过X线片测量比较正畸前后断根根尖区相对骨密度的变化、断根倾斜度的变化和修复后冠根比.结果 10颗患牙经正畸治疗后(牙合)向移动距离平均为3.99 mm,牵引后的牙根唇倾度减小,但与治疗前比较无统计学意义(P>0.05).修复后患牙冠根比与对侧同名牙相比无统计学差异(P>0.05).结论 对于伤及牙槽嵴顶下的前牙牙根,在一定条件下可通过正畸方法(牙合)向牵引龈下牙根,经修复治疗后,可达到美观和功能的效果.
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