Comparative Evaluation of Shear Bond Strength of Resin Modified Glass Ionomer Cement and Biodentine as Dentin Substitutes to Bonded Silver Amalgam and Composite Resin ZC18-ZC21
Dr. Sandya Kini,
Manipal College of Dental Sciences, Department of Conservative Dentistry and Endodontics, Manipal- 576104,
Introduction: 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.