evaluation of tensile bond strength between dentin and metallic copings using different resin cements

Statement of the problem: for a successful clinical outcome, luting agents should have a high bond strength. bond failure is still one of the main reasons of restoration failures. purpose: the present study was designed to comparatively evaluate the retention of metallic copings using different resin luting cements. materials and method: in the present experimental study, 40 intact premolar teeth were included. the teeth were prepared to receive copings with a chamfer bur at high speed, cooled with an air/water spray. the occlusal surface was prepared flat, perpendicular to the long axis of the root at a standardized height of 4 mm from the gingival chamfer finish line with a 20 degree consistent taper of axial walls. the wax patterns were prepared and cast. teeth with un-cemented casts were randomly divided into 4 groups based on the type of cement used. the tensile load required to dislodge the crowns was measured using instron universal testing machine with a crosshead speed of 1mm/min. the data were analyzed by spss software and kruskal-wallis test (α=0.05). results: the maximum and minimum amounts of crown retention were in panavia-f2 and maxcem cements respectively. despite this different retention values in cements, kruskal-wallis disclosed no significant difference between groups in the mean amount of crown retention. (p-value=0.068) conclusion: regarding the results of the study, it was concluded that there are no mentionable differences between all groups.