الفهرس 
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Abstract
In this study the shear bond strength of the flowable composite to ceramic and nickelchromium alloy were evaluated using two different polymerization technique either with or without application of silane coupling agent. A total of 80 samples, the half of the samples were made of ceramic and the other half was made of nickelchromium alloy. Each half was divided into two equal main groups of 20 samples each, representing repair of samples with direct or indirect technique. Each main group was subdivided into two subgroups 10 samples each, repair with or without silane coupling agent. Application of the flowable composite to ceramic and metal surfaces using a teflon split mold was according to the manufacturer?s instructions. All samples were stored in distilled water at room temperature for 48 hours and then subjected to 500 thermocycles, between 5 oC and 55 oC with a 20 second dwell time. The bonded samples were tested in terms of shear using Universal Instron Testing Machine. The debonded samples were examined using SEM under higher magnification to observe the fractured line and site of fracture. Then the results were tabulated and statistically analysed. Based on the results of this investigation, the following conclusions can be made. 1. Silane treatment of ceramic was critical for obtaining suitable bond strength of flowable composite to ceramic. 2. Silane treatment had a significant negative effect on the bond strength of flowable composite to metal. 3. Higher bond strength values were obtained with indirect technique compared to direct technique with ceramic surfaces but there was no difference with metal surfaces. 4. Results of scanning electron microscope shows that the bond strength of flowable composite to ceramic and metal was higher than the cohesive strength of flowable composite.