AN IN-VIVO COMPARATIVE-STUDY OF 2 APEX LOCATORS

Two different electronic apex locators were used before extraction to determine working length in 116 root canals belonging to 34 molars. Th e results were then compared with postextraction working length measur ements. The determinations were made before and after eliminating the canal contents and drying the interior. The results showed that 84.8% and 79.3% of the Odometer, and 89.6% and 88.7% of the Endocater readin gs for dry and nondry canals, respectively, occurred within the two 0. 5-mm intervals closest to the apical constriction.