中文摘要：

目的：在临床根管治疗过程中,分析活髓状态对DENTAPORT ZX,RAYPEX 5,PROPEXⅡ三种根尖定位仪测量根管工作长度的准确性的影响。方法：收集因急慢性牙髓炎、牙髓坏死、根尖周炎需行根管治疗的恒牙活髓根管50个。用三种根尖定位仪分别测量根管工作长度并记录数据,再测量并计算根管实际工作长度。比较根管实际工作长度与根尖定位仪所测长度的差值,并进行统计学分析。结果：活髓状态下,DENTAPORT ZX与RAYPEX 5、PROPEXⅡ之间的测量差别有统计学意义,而RAYPEX 5与PROPEXⅡ之间的测量差别无统计学意义。结论：活髓牙DENTAPORT ZX的测量更准确。

英文摘要：

Objective： In the process of clinical root canal treatment,analyzed the vital pulp of influence the accuracies of DENTAPORT ZX,RAYPEX 5 and PROPEX Ⅱ for measuring the working length of the root canal. Methods： Collect 50 vital teeth and permanent root canals which need root canal treatment because of the acute and chronic pulpitis,pulp necrosis,and periapical periodontitis.Three electronic apex locator in root canal working length were measured and recorded data. And then Measurement and calculation of root canal working length. Compare the difference between the root canal working length and the measured length of root apex locator,and statistical analysis. Results： although there is no significant difference between RAYPEX 5 and PROPEX measured,the significant difference can be found between DENTAPORT ZX,RAYPEX 5 and PROPEX measured. Conclusion：DENTAPORT ZX is more accurate measurement under the vital teeth status.