ABSTRACT\n Purpose: The aim of our in vitro study was to evaluate the sealing quality of the core-carrier system GuttaCore and compare it with central cone technique with tapered gutta-percha cones regarding apical leakage. Materials and methods: 24 human single rooted teeth were used for the study. Root canal preparation was done using ProTaper Universal rotary system up to F3. The teeth were randomly assigned into 2 groups, depending on the root canal filling technique. The specimens were immersed in 2% methylene blue dye and the linear dye leakage at the apical third was measured in mm. Results: Statistical analysis showed that Guttacore group had significantly less leakage in apical third than the central cone technique. Conclusions: Under the conditions of this study, it could be concluded that obturator techniques showed better sealing results as the central cone technique in the apical third of root canals.\nKeywords: apical sealing, microleakage, Protaper rotary instruments, Guttacore

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