Comparative Evaluation of Shear Bond Strength of Two Posterior Restorative Materials in Primary Teeth: An in Vitro Study

Abstract Introduction: Dental caries remains to be one of the most common diseases encountered in the field of dentistry. Several restorative materials have been introduced with different properties are most widely used nowadays because of their superior aesthetic and physical properties. Shear bond strength of a restorative material plays a key role in deciding the restoration’s longevity. Hence, for a better selection of the restorative material, shear bond strength needs to be evaluated. Aim: Study aim was to evaluate and compare shear bond strength of two posterior restorative materials in primary teeth. Material & Methods: Twenty extracted deciduous molars were selected for a study to compare the shear bond strength of two restorative materials. The teeth were mounted in acrylic blocks and a uniform dentinal surface was exposed by sectioning with a diamond disk. The specimens were randomly divided into two groups based on the restorative material used: Group 1, restored with Tetric N-Ceram (a nanohybrid composite) and Group 2, restored with Wizdent WONDER BULKFILL (a bulk-fill composite). The restorative materials were applied to the dentinal surfaces using plastic moulds to ensure uniformity and the specimens were stored in distilled water to simulate oral conditions until testing. Shear bond strength was then measured for all specimens using a universal testing machine, providing data on the adhesive performance of the two materials on deciduous dentin. Results: The study results indicated that the shear bond strength values for Tetric N-Ceram (19.8460 MPa) and Wizdent WONDER BULKFILL (20.0200 MPa) were comparable. This finding suggests that the bulk-fill composite restorative material demonstrated shear bond strength on par with the nanohybrid composite restorative material when bonded to deciduous dentin. Conclusion: From this study it can be concluded that bulk-fill composite restorative material has comparable shear bond strength to nanohybrid composite restorative material.