Comparative Evaluation of Shear Bond Strength Of Various Core Build – up Materials In Maxillary Anterior Teeth - An In-Vitro Study

Abstract

Need for the study: Incisors are commonly damaged by caries or trauma. The major portion of the crown part of a damaged anterior tooth could be restored with a core build-up material which not only reinstate aesthetics but also withstand an array of forces in the oral cavity. Aim: To evaluate the Shear Bond Strength(SBS) of Zirconomer, Resin Modified Glass Ionomer cement(RMGIC), Microhybrid Composite and Nanocomposite as core build-up materials in maxillary anterior teeth. Methodology: 48 extracted intact human maxillary central incisors were collected and divided into four groups.Anatomic crown was trimmed upto fifty percent which involved the enamel and partly the dentin of each tooth. The experimental teeth were mounted in chemical cure acrylic resin and restored with Zirconomer, RMGIC, Microhybrid Composite and Nanocomposites. The samples were subjected to Shear Bond Strength(SBS) analysis using a universal testing machine (UTM). Results: Composites exhibited better mechanical properties than Glass Ionomer Cements. Nanocomposites had the highest Shear Bond Strength followed by microhybrid composites but there was no statistical significance. Conclusions: Nanocomposite possess better mechanical properties and also offers superior esthetics due to its supercilious polishability, proving to be the ideal core build-up material for maxillary anterior teeth. Key-words:Core build up- Composite-Glass Ionomer Cements-Shear Bond Strength