EVALUATION OF BOND STRENGTH OF A HEAT PRESSED CERAMIC TO RESIN CEMENT AFTER VARIOUS SURFACE TREATMENT: AN IN VITRO STUDY

Dr. Abhimanuy Rampal, *Dr. Saurabh Gupta, Dr. Swatantra Agarwal, Dr. Sabeeha Hussian, Dr. Kumari Kalpna and Dr. Prakhar Khurana

ABSTRACT

The aim of this study was to evaluate the bond strength of heat pressed ceramic to resin base cement after various surface treatments. Sixty six samples of 4 mm diameter and 3 mm thickness were fabricated from heat pressed ceramic ingots by lost wax technique. Samples were divided into three groups for three surface treatments. Group 1 was treated with 37% orthophosphoric acid for 20 seconds, Group 2 was sandblasted with 250 µm Alumina under 4.1 bar air pressure for 5 seconds and Group 3 was treated with 9% hydrofluoric acid for 20 seconds. After treatment all samples were cleaned, dried and silane coupling agent was applied for 60 seconds. Surface roughness was measured with scanning electron microscope and shear bond strength was measured with universal testing machine. There was highly significant difference in the mean value of shear bond strength among different groups p<0.001. ANOVA is highly significant also. Shear bond strength was found maximum in hydrofluoric acid etched samples followed by sandblasting samples and it was found to be least in ortho-phosphoric acid samples.

Keywords: Press ceramic, surface roughness, shear bond strength, hydrofluoric acid, sand blasting, ortho-phosphoric acid.