Comparative assessment of various root canal sealer for failure mode after obturation; An in vitro study

Abstract

Success of root canal treatment depends upon five major steps. Among them, biomechanical preparation is most important. Root canal system shows various anatomical variations. These variations will help microorganism to harbour themselves. In order to disinfect the root canal, various irrigating solutions are used. These chemical solutions may change the surface characteristics of root dentin. Hence, this study was carried out with an aim- to determine the failure mode of sealer after obturation using the various irrigating solution. The study was carried out using 40 extracted premolars. Biomechanical preparation was done using the crown down technique. Various irrigating solutions, namely, 5.25% sodium hypochlorite. 2% chlorhexidine gluconate, QMIX 2 in 1, 17% EDTA liquid were used for irrigation. Later obturation was done using AH plus sealer and cold condensation technique. A section of 5mm root was obtained at the middle one third. Push out bond strength was evaluated and the mode of failure of the sealer was noted. The maximum number of mixed failure mode (n=7) in Qmix 2 in 1 as well as in 2% CHX. Similarly, in 5.25% NaOCl, 8 samples showed Mixed failure mode. However, in 17% EDTA, the equal number of the sample had Adhesive and Mixed type of failure mode (n=5). Use of EDTA + CHX or QMix during final irrigation significantly improved sealer penetratin resulting in impervious seal to the obturation. Thus contributing to the success of endodontic treatment.