Accuracy Of Electronic Method In Working Length Determination In Different Modes -An In Vitro Study

R Joshi, Santosh ManRajbhandari


BackgroundDetermining the root canal length accurately has been a challenge in endodontics. The accurate determination and even estimation of apical constriction is not possible with radiographic method. Electronic methods are now widely used during endodontic treatment for the assessment of root canal length.
Aims and objectivesThe aim of this study is to evaluate the influence of different irrigants in the accuracy of electronic apex locator in determination of the tooth length.
Materials and MethodsThis, in vitro study compares the effectiveness of dual frequency dependent Electronic apex locator under dry mode and in the presence of various irrigants as for Normal saline (NaCl), 3% Hydrogen peroxide (H2 O2
) and 5.2% Sodium hypochlorite (NaOCl). Sixty extracted, single rooted & single canal human anterior teeth were used. Actual length was confirmed by the file tip viewing at the level of the apical foramen under stereomicroscope. The teeth were then mounted in alginate mould. The measurements were obtained by Electronic Apex locator were compared with actual length and subjected to statical analysis by one way ANOVA and Post Hoc Games Hawell test at the 5% significant level.
ResultsNo significant statistical difference was found between actual length of the canal & Electronic apex locator measurements under dry mode and in presence of saline where as statistical significant difference was found in presence of H2 02 & NaOCl.
ConclusionThe result of this study indicate that the frequency based Electronic Apex Locator (EAL) can accurately determine the tooth length even in presence of intracanal irrigating solution.


Electronic apex locator, working length, irrigants, NaCl, H2O2 , NaOcl

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