Comparative Evaluation of Shear Bond Strength of Resin Modified Glass Ionomer Cement and Biodentine as Dentin Substitutes to Bonded Silver Amalgam and Composite Resin

摘要

The bond strength between the restorative material and the tooth, as well as between the restorative material and the base, is an important factor and can determine the longevity of a dental treatment.Aim: Comparative evaluation of shear bond strength of Resin modified glass ionomer cement and Biodentine as dentin substitutes to Bonded silver amalgam and Composite resin.Materials and Methods: Acrylic resin blocks of dimension 3x1.5x1.5 cm were made. A total of 40 acrylic blocks containing a central hole (wells) with 4 mm diameter and a 2 mm height were prepared. The samples were randomly divided into two groups- Group 1 and Group 2 having 20 samples each. The wells of Group 1 and Group 2 were filled with Resin Modified Glass Ionomer Cement (RMGIC) and Biodentine, respectively according to manufacturer?s instructions. The samples of each group were further divided into four subgroups (n=10): Group 1A, 1B, 2A, 2B. The surface of Group1A and 2A were etched and then treated with adhesive (Adper single bond-2, 3M ESPE) and restored with nanohybrid composite resin and specimens of 1B and 2B were etched and treated with adhesive (Meta P & Bond- MetaBiomed) respectively and were restored with silver amalgam. All the samples were stored in artificial saliva for 24 hours at 37.5°C, 100% humidity and were subjected to shear bond strength testing.Results: Group 1A (RMGIC + Composite) showed the highest shear bond strength values-29.58 MPa followed by Group 2A (Biodentine + Composite resin) - 5.59 MPa, Group 1B (RMGIC + Bonded silver amalgam) - 3.96 MPa and least was seen in Group 2B (Biodentine + Bonded silver amalgam) - 0.445 MPa.Conclusion: This study concluded that combination of Composite resin and RMGIC or Composite resin and Biodentine showed higher shear bond strength values as compared to a combination of RMGIC and Bonded silver amalgam or Biodentine and Bonded silver amalgam.