Comparative Evaluation Shear Bond Strength of Resin Composite Cement to Coronal Enamel, Cementoenamel Junction and Root Cementum: An in Vitro Study

Abstract

Aim: To compare shear bond strength of resin composite cement to coronal enamel, cementoenamel junction and root cementum. Materials and Methods: Twenty one extracted human permanent teeth were selected and randomly divided into three groups(n=21) according to area of adhesion. group 1(n=7): coronal enamel. group 2(n=7): cementoenamel junction. group 3(n=7): root cementum. An area of 5mm x 5mm was selected on tooth of each specified group. Area was etched for 15 seconds with 35% phosphoric acid and washed off. Bonding agent was applied on area and light cured, composite was applied and light cured for 30 seconds. Teeth were mounted in acrylic resin and stored in distilled water. Specimens were subjected to shear load using universal testing machine at cross head speed of 0.5mm/min. Results: According to results obtained from the study comparative shear bond strength (in Mpa) of resin composite cement to coronal enamel, cementoenamel junction and root cementum, highly statistically significant (p<0.001) difference was observed among three groups. Discussion: The cervical area of teeth is most unpredictable region for durable adhesive bonding. This study was performed to evaluate adhesion potential of composite cement to coronal and cervical structures of teeth. Conclusion: Under this study, we can conclude that adhesion to root cementum is less favorable compared to adhesion to CEJ and coronal enamel.