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Objective: The purpose of this study was to determine the effect of cutting speed and feeding force in specimen preparation on the microtensile bond strength test.
Materials and Methods: Sixty flat middle dentin prepared from human third molars were restored with one-step self-etching adhesive system (Prime& Bond Universal) and composite resin (Filtek Z350XT) following the manufacturer’s instructions. After 24 hours storage in distilled water, the restored specimens were randomly divided into 6 groups, then, the specimens of each group were sectioned in x- and y-axis according to different cutting speeds and feeding forces as follows: 300 rpm/20N, 300 rpm/40N, 300 rpm/60N, 1000rpm/20N, 1000 rpm/40N, and 1000 rpm/60N to obtain resin-dentin sticks with a cross-sectional area of 1.0 mm2. Four sticks from the center of each tooth were subjected to the microtensile bond strength test. Also, five additional specimens from 80 remaining of each group were randomly selected for surface topography observation under SEM.
Results: Bond strength of the 1000 rpm cutting speed group was significantly higher than that of the 300 rpm cutting speed group (p<0.001), whereas the feeding forces had no influence on bond strength values (p=0.952). From the SEM observation, stick beams prepared with the 1000 rpm cutting speed showed a small defect score on the edge of the specimen in comparison with stick beams prepared with the 300 rpm cutting speed (p=0.006).
Conclusion: The cutting speed had a significant influence on bond strength and surface integrity of the resin bonded dentin specimen for the microtensile bond strength test.
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