microtensile bond strength of three restorative core materials with ips e.max press ceramic by two resin cements

objective: the aim of this study was to compare the microtensile bond strengths (μ tbs) of three core materials with one lithium disilicate reinforced ceramic using two resin cements. methods: three core materials (nulite f® (biodental technologies), filtek z250® (3m-espe), prettau-anterior® (zirkonzhan, germany)) were prepared as blocks (10×10×4 mm3) according to the manufacturer’s instructions. lithium disilicate ceramic blocks were also constructed and bonded to core specimens with two dual curing luting resin cements (duo-link® (schaumburg, il), bifix qm® (voco, cuxhaven, germany)). micro-bar specimens were prepared and loaded in tension to determine the μ tbs failure modes were classified by scanning electron microscope (sem). data were analysed using two-way anova and tukey hsd test. results: the μ tbs varied significantly depending on the core materials and resin cements used (p < 0.05). the μ tbs of bifix qm was significantly higher than of duo-link in all core materials. the μ tbs of zirconia core was significantly higher than of both composite cores with both resin cements. there were no statistically significant differences among nulite f and filtek z250 (p > 0.05). the highest bond strength was obtained between zirconia core and bifix qm (45.3 ± 6.7 mpa). conclusion: in vitro μ tbs of glass ceramic blocks bonded to zirconia core material showed higher bond strength values than resin-based core material, regardless of the resin cement type used.