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Abstract

The purpose of this study was to evaluate the effectiveness of using conventional vs self-etching ceramic primer on the shear bond strength (SBS) of luting resin cement to feldspathic CAD/CAM ceramic blocks. Methods: A total of 20 feldspathic porcelain disc specimens were sectioned from prefabricated ceramic blocks (Cerec blocks). They were divided into 2 groups (n=10) according to surface treatment. Group A (Conventional technique) included the application of 9.6% Hydrofluoric acid etching and then a Monobond-N silane agent; Group B included the application of Monobond etch & prime only. Resin cement cylinders (4.25 mm in diameter, 2 mm in height) were directly bonded on the pre-treated ceramic discs and light cured for 40 seconds. Shear bond strength was measured using a universal testing machine at a cross-head speed of 1 mm/min. The data were analyzed using a Student t-test with a significance level of 0.05. Mode of failure was observed and registered. Results: The mean ± standard deviation of shear bond strength of Group A was 7.64 ± 2.9 MPa and Group B was measured at 9.2 ± 2.68 MPa. There was no statistically significant difference between the two groups. Most of the specimens (8/10 in group A and 9/10 in group B) cohesively failed within the ceramic layer. Conclusion: Within the limitation of this study, self-etching ceramic primer provided equivalent results to the conventional technique in terms of shear bond strength to feldspathic ceramic material while simplifying the technique.