三种测量根管工作长度方法准确性的评价研究

目的：比较与评价临床常用的手感法、X线指感法和R00TZX电测法测定根管工作长度的准确性。方法：随机将101例患者、150颗需根管治疗的牙齿分成3组，每组50颗，分别用手测法、X线指感法和ROOTZX法测定根管工作长度，比较其准确度。结果：ROOTZX法与X线指感法的适填率为94％、92％，差异无显著性，手感法的适填率为76％，ROOTZX法与手感法差异有显著性。结论：ROOTZX组在减少术后超填方面优于手感法。ROOTZX组与X线指感法无显著差异，但ROOTZX测量根管操作方便，患者受到的辐射少，费用低。

Accuracy of three methods of determining the working length of root canal

Objective:To evaluate the accuracy of three methods of determining the working length of root canal. Methods:One hundred and one patients with 150 teeth were divided randomly into three groups : group 1 with hands measuring method ,group 2 with hands and X-ray measuring method ,group 3 with ROOT ZX method. Results:The percentage of proper filling was 76% in group 1,92% in group 2 and 94% in group 3 .The difference was significant between group 1 and group 3,but not significant between group 2 and group 3.Conclusion:ROOT ZX is better than hand measuring method in decreasing overfilling quantity . ROOT ZX and hands with X-ray measuring method are both accurate and reliable in determination of root canal length ,but the cost of ROOT ZX is less ,and the radiation of ROOT ZX is lower.