“Evaluation of shear bond strength of a composite resin to biodentine with three different bonding systems-an in vitro study”

Abstract

The purpose of the study was to evaluate the bond strength of composite resin to Biodentine using three different bonding systems.

Method: 60 cylindrical acrylic blocks with central hole measuring 4mm in diameter and 2mm in depth was prepared and Biodentine was placed and divided into three groups.

In Group A, the surface of the Biodentine was etched with 37% phosphoric acid and then adhesive (Adper single bond 2, 3M ESPE, USA) applied. In Group B a self etching adhesive (Clearfil SE Bond, Kuraray, Japan) was used, and Group C, an all in one system (G Bond, GC Corporation,Japan) was used . A composite resin (Filtek Z350 XT, 3M ESPE, USA) of the dimension 2mm diameter and 2mm length was placed on the Biodentine in all three groups. The polymerized specimens were stored in 100% relative humidity at 37^o C for 7 days in an incubator.

               These specimens were secured in a holder placed on platform of the universal testing machine for shear bond strength testing. A knife edge blade of the dimension 2mm was used to apply a vertical loading force at a cross head speed of 1.0mm/min until the failure of the bond between the composite and biodentine was seen. The peak at which this failure occurs was recorded. The bond strength was calculated in kilonewton and divided by specimen area and subjected to one-way analysis of variance (ANOVA) and Tukey’s post hoc test.

Results: Group A showed a bond strength of 0.024 kN/mm² , Group B 0.015 kN/mm² and in Group C 0.020 kN/mm² bond strength was recorded.

Conclusion: Group A i.e. etch and rinse system showed the highest bond strength followed by Group C i.e. all in one bottle system and lowest bond strength was recorded with Group B i.e. self etching adhesives.