similar to Group IB using Xeno V adhesive system. All the specimens were stored in distilled water for 24 hrs. Shear bond strength (SBS) testing was performed in a universal testing machine (Star Testing System). Bond strengths were calculated using the load required to debond the specimen and the area of resin composite. Mean bond strengths were calculated and the results were analyzed using a computer program (SPSS 12 for Windows, SPSS Incorporated, Chicago, IL, USA). Unpaired t-test was used for comparison