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目的:分析不同因素对根尖区分离器械取出率的影响.方法:运用显微镜处理77个根管内81只分离于根尖区的器械并进行为期1年的随访.对根管弯曲度、分离器械深度及可否规划直线入路等因素进行统计,分析其对取出率的影响.结果:取出42个根管中的46只分离器械,取出率56.8%.统计显示,取出率随根管弯曲度及分离器械深度的增加显著下降,可否规划直线入路与取出率显著相关.结论:根管弯曲度、分离器械深度、可否规划直线入路均为影响根尖区分离器械取出率的因素,其中可否规划直线入路可作为评估取出率的主要依据.“,”Objective:To investigate the impact factors affect removing separated instruments from the apical part of root canals.Methods:A total of 81 separated instruments in 77 root canals were treated with DOM(dental operating micro-scope).The success rates were calculated and the cases were reviewed in 1 year after treatment.The impacts on success rates were statistically analyzed by straight pathway,canal curvature and depth of separated instruments.Results:Forty-six separa-ted instruments in 42 root canals were removed with a success rate of 56.2%(46/81).By statistical analysis,straight path-way,canal curvature and depth of separated instruments have significant effects on the success rates.Furthermore,the correla-tion analysis was performed to find out that straight pathway is the key factor on success rates.Conclusion:The straight path-way is the decisive factor on success rate of retrieval separated instruments from the apical part of root canals.