Evaluation of microtensile bond strength on ceramic-resin adhesion using two specimen testing substrates

AbstractObjectives jective of this study was to compare two bonding models using a microtensile bond test and evaluate the effect of two surface treatments on lithium disilicate ceramics using two resin cements. s c blocks (e.max CAD®) were sectioned, polished and fired for final crystallization. The blocks were treated with one of two surface treatments: (1) hydrofluoric acid (HF) (IPS Ceramic Etching gel) etched followed by silane (Monobond-S) application; (2) HF etched, silane applied, followed by hot air drying and rinsed with hot water, dried and an unfilled resin (Heliobond) applied. Ceramics without surface treatment were the control. Two bonding substrates were used: resin composite and ceramic with the same surface treatment and the corresponding groups were divided into two bonding models: ceramic to ceramic (C–C) and ceramic to resin composite (C–R). Two resin cements, Variolink II® and Clearfil SA Cement, were tested. Each group (n=30) was stored in distilled water for 7 days at 37 °C, then subjected to a tensile force until failure. Failure modes were determined with stereomicroscope and SEM. ANOVA, Bonferroni tests and Weibull analysis were used for statistical analysis (p<0.05). s e control groups experienced spontaneous debonding during preparation. The C–C groups showed significantly higher bond strength than the C–R groups (p<0.05). Failure mode in the C–R groups was dominated by cohesive failure in resin cement while in the C–C groups was mostly mixed failure. Ceramic treated with HF etching and silanization and luted with Variolink II showed the highest bond strength (53.5±6.6 MPa) while ceramic treated with HF etching, silanization and hot treatment and luted with Clearfil SA Cement showed the lowest bond strength (35.4±7.0 MPa) in the C–C groups. Weibull analysis showed that Weibull modulus in the C–C model was higher than the C–R model. sions c-bonded to ceramic model is recommended for evaluating the microtensile bond strength of ceramic-resin cement-adhesion. Variolink II showed better bonding than Clearfil SA Cement.