Comparative evaluation of shear bond strength and surface roughness of various reinforced polyetheretherketone materials - an in vitro study Aim: This study aims to evaluate and compare the shear bond strength and surface roughness of various reinforced polyetheretherketone materials and to find if surface roughness has a positive effect on shear bond strength. Materials and methods: A total of 144 PEEK discs were prepared for this study. PEEK specimens were divided into three groups based on reinforcements. It included unfilled PEEK, 30% carbon reinforced PEEK, and 10%carbon+10%graphite+10%PTFE reinforced PEEK. Each group included 48 specimens. From each group, specimens (n=36) were subjected to different surface treatments and were bonded with indirect composite discs. The shear bond strength between the veneering composite and PEEK specimens was measured. The remaining specimens (n=12) from each group were subjected to nanoindentation after which surface roughness was measured. Result: The statistical analysis was done by one-way ANOVA and the mean values were compared using Post Hoc tests. The results showed that there was a significant difference (p ˂ 0.05) in shear bond strength between veneering composite and different PEEK materials and the highest value was noted in 30% carbon-reinforced PEEK. A significant difference was also found in surface roughness and the highest value was seen in 30% carbon-reinforced PEEK. Conclusion: Among the tested materials, 30% carbon-reinforced PEEK exhibited the highest shear bond strength and surface roughness concluding that surface roughness has the positive effect of improving the bond strength of the material.