Abstract
The aim of the study was to evaluate the adhesive bond strength of bioactive cements to lithium disilicate ceramics in comparison to the resin based luting cements with two surface treatments, hydrofluoric acid (HF) and Er Cr YSGG laser (ECL). Ninety ceramic disks were fabricated and divided into three groups (n=30) based on the surface treatment employed; HF-S, HF-S (with Silane as control), ECL-2, for 2 minute duration, and ECL-4 for 2 minute duration and ECL4 for 4 minute duration. The laser treated groups were prepared with the use of a gold handpiece using an MZIO tip size (Er Cr: YSGG, water lase I plus). Surface treated disks in each group were further divided into three sub groups (n= 10) based on the type of cement applied; Bioactive cements, Rely X unicem and Rely X ARC. Subsequent to the application of the cements, Multicore Flow composite was build up with the help of the putty mould; specimens were placed in a thermocycler for 5000 cycles at 5 degrees C and 55 degrees C. Each specimen disk was tested under the universal testing machine for shear bond strength (SBS). Data was analysed using analysis of variance and Tukey's - Kramer multiple tests (p<0.05). The maximum mean value for shear bond strength achieved was 23.55 (+/- 2.26) for Rely-x unicem-.-HF-S and the minimum mean value was 14.30 (+/- 2.08) for the group bioactive and ECL-2. Therefore, it was concluded that the adhesive bond strength of the bioactive cements on lithum disilicate ceramics was lower than the resin based luting cements. Difference in surface treatments did not influence the adhesive bond strength of bioactive cements to the lithium disilicate ceramic.