COMPARISON OF APICAL EXTRUSION OF CHLORHEXIDINE USING 2 DIFFERENT ROOT CANAL IRRIGATION TECHNIQUES

Abstract

Introduction: We compared the apical extrusion of Chlorhexidine delivered with a 27-G needle, and the EndoVac system (SybronEndo, Orange, CA) during the instrumentation and final irrigation of root canals. Methods: Matched paired single-canal teeth were divided into 2groups. The experimental groups were needle irrigation size #30 (NI30) , and EndoVac size #30 (EV30) Teeth were embedded in 0.2% agarose gel (pH = 7.4) containing 1 mL 0.1% m- Cresol purple (titan media), which changes color at a pH level of 9.0. Root canals were irrigated with Chlorhexidine using 2 different techniques, and the amount of irrigant was controlled. Standardized digital photographs were taken 20 minutes after the first irrigant was used and were analyzed to determine the amount of extrusion (expressed as a percentage of total pixels). Results: The amounts of apical extrusion obtained in the NI30 and EV30, were 50% (10/20), and 10% (2/20), respectively. The EndoVac group showed significantly lower extrusion values than the needle irrigation techniques in terms of the number of teeth and pixels. Conclusion: The risk of apical extrusion is significantly lower with the EndoVac in comparison with the needle irrigation techniques.