![]() ![]() The statistical package for the social sciences (SPSS) version 16.0 (SPSS Inc., Chicago, IL, USA) was used to compare the WLs of three groups, and the statistical significance was considered to be P ≤ 0.05. WL with EAL (Group 3) was determined after access opening. ![]() Thirty permanent anterior teeth with complete root formation indicated for RCT were included in this study.Ĭonventional radiograph (Group 1) and conventional radiograph with external grid (Group 2) were made before access opening. The aim of this study is to compare and evaluate the preoperative estimated WL with conventional radiograph and with grid radiograph, with reference to electronic apex locator (EAL) in single-rooted teeth. Working length (WL) is the key element in achieving this. The apical termination of obturation is the most important factor influencing the success of root canal treatment (RCT).
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