A clinical evaluation on accuracy of RayPex5 apex locator for measuring root canal working length

In order to evaluate the accuracy of RayPex5 apex locator in measuring root canal working length in clinical practice and to analyze the possible factor resulting in deviation,the working length of total 211 root canals were measured by handing method and electronic method respectively.The exact working length of those root canals were determined by X-ray method.The accuracy rate of electronic method and handing method was 96.21% and 78.2% respectively,with significant difference(P0.001).The accuracy rate of front teeth group and molar group measured by electronic method was 100% and 92.5% respectively,with significant difference(P0.05),while the apical paradentitis group and the apical non-paradentitis group,the front teeth group and the premolar group,and the premolar group and the molar group didn' t differ from each other,respectively.The study showed that the accuracy rate of electronic method was high for determining root canal working length,and Raypex 5 apex locator could define apical seat to measure root canal working length accurately.