Tricalcium silicate 기반 치수복조재의 미세누출 및 상아질 전단결합강도 비교

Abstract

The purpose of this study was to evaluate the microleakage of composite resins(Filtek ™ Z250), resin-reinforced glass ionomer cements (Fuji II LC®), and traditional glass ionomer cements (Ketac ™ Molar) which are used as final restorative materials, along with three tricalcium silicate based pulp capping agents, such as Theracal LCTM (TLC), BiodentineTM (BD), and ProRootTM White MTA (WMTA), in clinical trials and to compare the shear bond strength between these three types of pulp capping agents and dentin. The incisor of cow was formed as a class V cavity and classified into 9 groups according to the type of the direct pulp capping agents and final restoration at random. After blocking the apical area, nail varnish was applied to the entire surface of the tooth except 1 mm around the marginal perimeter. And after immersion in 0.5% fuchsin solution, washing and drying were performed. Each specimen was cut into disks under applying water and the cut surface was observed with a stereoscopic microscope. The results showed that the each group of TLC + KetacTM Molar, TLC + Fuji II® LC, TLC + FiltekTM Z250 and BD + KetacTM Molar showed the least microleakage and the each group of WMTA + Fuji II LC® and WMTA + FiltekTM Z250 showed the most microleakage. After implantation of the incisor of cow by exposing clinical crown to autopolymerized acrylic resin, the center of the crown was cut parallel to the occlusal surface under applying water. And then, the prepared specimens were randomly divided into three groups. TLC, BD and WMTA blocks were applied according to the manufacturer's instructions and the bonding strength was measured using a universal testing machine. The WMTA group showed statistically significantly lower shear bond strengths than the TLC and BD groups.