ABSTRACT
The determination of working length and its maintenance during cleaning and shaping procedures is a key factor for successful endodontic treatment. The aim of this in- vitro study was to evaluate the utility and accuracy of Raypex5 electronic apex locator in determining the working length in comparison to conventional radiography and radiovisiography in posterior teeth. Methods: In this study sixty extracted mandibular first and second molars were used. Diagnostic images were obtained both by conventional radiography and radiovisiography (RVG) and tentative working length was obtained and recorded. After access opening actual root canal length was determined by both conventional radiography and RVG and recorded. Four blinded observers determined the working length in all samples with Raypex5 electronic apex locator. Then at that length file position was checked using RVG. Results: All the data collected was statistically analyzed using one way analysis of variance (ANOVA), Cronbach’s alpha reability analysis and student paired t-test. Conclusion: In this study it was found that Electronic apexlocator Raypex 92 %, RVG 74% and conventional radiograph was 70% accurate in measuring root canal length in posterior teeth.