(PO112) Comparison of Working Length Determination Between Cone-beam Computed Tomographic and Apex Locators in Posterior Teeth

Abstract: Proper working length determination plays an important role in the success of root canal therapy. The purpose of this study was to evaluate the accuracy of CBCT (Morita Veraview X800) measurement of working lengths relative to those established clinically with an electronic apex locator (Morita Root ZX II). Eighty-six posterior teeth in which the focal view CBCT image was indicated for treatment were included in this study. Working lengths determined by the CBCT image using the measuring tool were recorded and categorized by tooth type (premolar and molar). These lengths were then compared to the working lengths determined with the Morita Root ZX II. Paired t-tests were used to determine any statistical differences among groups. There was no statistical difference when comparing CBCT working lengths to working lengths determined by the Morita Root ZX II apex locator. Tooth type (p > .01) did not make a statistically significant difference. This study supports the use of the CBCT measuring tool as a possible adjunct to the apex locator during working length determination.