Raypex 5根尖定位仪临床应用的准确性观察分析

目的：观察Raypex 5在临床应用中测量根管工作长度的准确性及影响因素。方法：共收集342例患者的903个根管,随机分为实验组和对照组。实验组458个根管采用Raypex 5测量根管工作长度。对照组445个根管,按手感法测量根管工作长度,拍摄X线片,分析比较,研究其准确性及影响因素。结果：在X线片上恰填范围内,实验组准确率达94.32%,对照组75.06%。电测法与手感法的准确率比较有显著性差异（P〈0.01）。牙髓活力,根尖骨质破坏状况,龋洞类型,牙位,牙齿形态,根管数目对Raypex 5测量根管工作长度的准确性无明显影响。结论：根尖定位仪Raypex 5能较为准确地测量根管工作长度,准确率比手感法高,值得临床推广使用。

Clinical Evaluation of the Accuracy of Raypex(R) 5 Electronic Apex Locator

Objective： To assess the accuracy of Raypex 5 electronic apex locator in measuring root canal working length.Methods： 903 root canals of 342 teeth were randomly divided into two groups.Raypex 5 electronic apex locator were used to measure 458 root canal＇ working length in experimental group,while manual measurement were used to measure 445 root canals＇ working length in control group.We combined the radiograph to evaluate the accuracy of different methods in measuring root canal working length.Results： Within-2.00mm～-0.5mm from the apical foramen in radiograph,the accuracy of experimental group was 94.32%,higher than the control group（75.06%）.The difference between electronic measuring methods and manual measuring methods was statistically significant（P〈0.01）.Many factors,such as pulp vitality,bone resorption in periapical lesions,types of caries cavity,tooth position,dental morphology,the number of root canal don＇t have significant effect on measuring root canal working length by Raypex 5 electronic apex locator.Conclusion： Raypex 5 electronic apex locator is an accurate and reliable method in determination of root canal working length.It is better than manual measurement and is worth popularizing in clinics.