Evaluation of the bond strength of different composite resins to porcelain and metal alloy

This study was carried out with the purpose of testing the bond strength of three different composite resins bonding to different base substrates. Substrates to which composite resins would be applied were prepared in three different ways: porcelain, metal and porcelain–metal in a 10-mm diameter and 4 mm thickness. Operating surfaces were air-abraded with Al ₂O ₃ and they were cleaned in distilled water in ultrasonic cleaning equipment for 10 min. After completing the preparation of the surface, three different composite resins with single bond agent in a 3.5-mm diameter and 2 mm thickness were applied to the central region of the specimens. All specimens were thermocycled between 5 and 55 °C for 200 cycles with a 30-s dwell time. After thermocycling, specimens were stored in 37 °C distilled water for an additional 7 days before being subjected to a shear load. Shear test was applied in using a Hounsfield test machine. The univariate analysis of variance and the Duncan multiple comparison test were used for statistical assessment. It was found that both type of composite material and of substrate led to statistically significant differences in bond strength ( p<0.01). It was found that there was higher bond strength in Filtek Z 250 and metal substrate (16.19 MPa) and there was lower bond strength in Surefil and porcelain base substrate (1.09 MPa).