Comparative Evaluation of the Shear Bond Strength of MTA and Biodentine to Different Permanent Restorative Materials: An In Vitro Study

Abstract

Purpose:The purpose of the study was to compare the shear bond strength (SBS) and, failure modes of mineral trioxide aggregate (MTA), and biodentine to nanocomposite, ceramic-reinforced glass ionomer (Amalgomer CR), and resin-modified glass ionomer cements (RMGIC). Materials and methods: Acrylic blocks were employed as a platform to place the cements and restorative materials. In the present study, 30 acrylic blocks were prepared and divided into two groups (n = 15 each), MTA and biodentine. The acrylic blocks were allocated into three subgroups (n = 5 each) based on the restorative material used (nanocomposite, Amalgomer CR, and RMGIC). The specimens were mounted in the universal testing machine to evaluate the SBS. Failure modes of each group were evaluated under a stereomicroscope. Kruskal-Wallis test was done to find the statistical significance of SBS among the three different materials in each group. In the case of statistical significance, the Dunn Bonferroni multiple comparison test was used to identify the significant pair of groups. Results: In the MTA group, MTA + nanocomposite showed the highest bond strength (7.77 MPa) and in the biodentine group, biodentine + nanocomposite showed the highest bond strength (9 MPa). The multiple comparison test showed a significant statistical difference in the SBS in the MTA group (p = 0.005). SBS among the three different materials with biodentine showed statistical insignificance (p = 0.153). Conclusion:The bonding of MTA and biodentine to the overlying restoration is affected by choice of the restorative material. In a clinical scenario, nanocomposite should be the preferred restorative material with both MTA and biodentine.