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The aim of root canal obturation is to create a "impermeable seal" to prevent theingress of bacteria and their toxins. To achieve this goal, disinfection of the canalsystem is accomplished by thorough chemomechanical debridement of the pulpaltissue, dentin debris, microorganisms, and the use of one or more disinfectants. Obturation of the canal system has historically been achieved with gutta-percha and an appropriate sealer to obtain a tight seal. There has been an ampleamount of research determining the dimensional changes and expansion of rootcanal sealer materials, but none have directly addressed the effect of dimensionalchanges on the gutta-percha cones The aim of the study was comparative evaluation of gutta-percha in contact with two different ratios of zinc Oxide eugnol sealer.The purpose of the study was to evaluate Expansion of gutta-percha in contact with Zinc Oxide Eugenol sealer Powder/Liquid Ratio of 1:1 and 1:5 after 1 day, 7 days and 30 days. Result : 30 days after the obturation, both ratios showed equal amount of expansion which was statistically insignificant (p<0.05) Keywords : Gutta-percha, Zinc Oxide Eugenol sealer, Spiral computed tomography.

iosr journal of dental and medical sciences

Comparative Evaluation of Expansion of gutta-percha in contact with two different powder/liquid ratios of Zinc Oxide Eugenol sealer – An in vitro study.