Evaluation of shear bond strength of conventional glass ionomer cements bonded to mineral trioxide aggregate: An in vitro study

Abstract

Introduction: This study measured the shear bond strength of conventional glass ionomer cements (GICs) (Xtra Fil and Fuji IX) bonded to white mineral trioxide aggregate (WMTA, Angelus) that had been allowed to set for two different time intervals. Materials and Methods: Sixty WMTA specimens were prepared; half were stored for 45 min and the remaining 30 specimens were stored for 72 h at 37°C and 100% humidity. Then, each group was divided into two subgroups of 15 specimens, and each GIC was layered on each of the two WMTA preparations. The GIC-WMTA shear bond strengths were measured and were compared by using one-way analysis of variance. Results: The shear bond strengths with the 45-min and 72-h WMTAs were 7.23 and 7.79 megapascal (MPa), respectively, for Xtra Fil and 7.87 and 8.12 MPa, respectively, for Fuji IX. The GIC-WMTA bond strength was not different between GIC applications to WMTA that had set for 45 min versus 72 h (P > 0.05). Conclusion: GICs might be used over MTA after the MTA has set for 45 min to allow single-visit direct pulp cap procedures.