الفهرس 
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Abstract
”Aim: This study aimed to evaluate and compare microshear bond strength (µSBS) of HEMA-free adhesive bonded to dentin with that HEMA-containing adhesive after water storage and thermal cycling. The resin dentin interface was investigated using scanning electron microscope (SEM).Materials and methods: For µSBS test, enamel of twenty-eight human molar teeth was removed to expose mid-coronal dentin. Then, they were assigned into two equal groups (n=14) according to the type of adhesive resin system used either HEMA-free or HEMA-containing. Composite resin restorations were applied to dentin surface using additional silicon mold). Half of specimens were exposed to aging protocol before µSBS test, the aging protocol was storage in artificial saliva for six months and thermalcycling for a total number of 5000. For micromorphological analysis of the resin/dentin interface, a total number of 12 teeth (n=12) were prepared following the previous grouping design. Then, they were gold sputtered twice and examined using SEM at magnifications of 500X, 1000X, and 2000X.Results: Two-way ANOVA test for the µSBS test showed that, there was no statistically significant difference between the tested groups (p>0.05). The type of adhesive system had no significant effect on µSBS. The aging protocol, which was 6 months’ storage in atrifacial saliva and thermalcyclinig for 5000 cycles, had no significant effect on µSBS. Conclusion: Within the limitations of the current study, it can be concluded that, the absence of HEMA had no significant effect on µSBS of adhesive resins bonded to dentin.