Fevaluation of the accuracy of electronic root canal length measuring methods using X-ray dental pictures

Objective: To investigate the accuracy of electronic root canal length measuring methods by JUSTY-Ⅱ full auto root apex locator.Methods: JUSTY-Ⅱ full auto root apex locator was used to detect the apical foramen of 130 teeth and the results were compared with the X-ray dental pictures.Results: An accurate location ±0.5 mm of the apex was obtained in 87.7% of the cases.Conclusions: Determining root canal length by full auto apex locator could attain good accuracy,reduce X-ray harm to patients,increase success rate of root canal treatment and decrease clinical time.