A Comparison of Five Conducting Media for Length Determination of Electronic Apex Locator Using a Simulation Model

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Passakorn Tanasoontrarat
Tanwarath Ackapolpanich
Narakorn Kong-ngoi
chalermkwan phuvoravan


The aim of this study was to compare five conducting media for length determination of electronic apex locator using a simulation model. Fifty plastic teeth were performed the access opening and mounted in simulation models. Simulation models were constructed with a clear acrylic tube (8 mm. in diameter) filled with conducting media in a clear acrylic box (50x50x30 mm). They were randomly allocated into 5 groups (n=10) according to the conducting media used which were 0.9% sodium chloride (NaCl), 2.5% sodium hypochlorite (NaOCl), 2% chlorhexidine (CHX), 17% ethylenediamine tetraacetic acid (EDTA), and cell culture medium (Minimum Essential Medium, MEM). The working length of each tooth was recorded visually (actual working length, AWL) and measured by an electronic apex locator at 0.5 bar (electronic working length, EWL). The mean differences between AWL and EWL were calculated and statistically compared among groups with one-way ANOVA, followed by Tukey’s HSD test (p<0.05). Results showed that the mean differences in the 0.9% NaCl and MEM groups were significantly lower than the 2.5% NaOCl, 2% CHX and 17% EDTA groups. Under the limitations of this study, 0.9% NaCl and MEM were suitable conducting media for length determination of electronic apex locator using a simulation model.


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Tanasoontrarat P, Ackapolpanich T, Kong-ngoi N, phuvoravan chalermkwan. A Comparison of Five Conducting Media for Length Determination of Electronic Apex Locator Using a Simulation Model. Khon Kaen Dent J [Internet]. 2021 Mar. 29 [cited 2023 Jan. 29];24(1):76-82. Available from: https://he01.tci-thaijo.org/index.php/KDJ/article/view/240892
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