Abstract
Introduction: Heat cured resins are commonly utilized for construction of complete and partial dentures. Such materials have poor mechanical properties and may be exposed to fracture. The present study, therefore, was conducted to evaluate the impact of incorporating ZnO on acrylic resins’ surface hardness. Materials and Methods: Twenty specimens were constructed in total. The study composed of 2 major sets, and each set had ten specimens. The 1st set had 1% zinc oxide and the second group had no zinc oxide and considered as control. All samples were subjected to the hardness test three times and average reading was recorded for all specimens. Results: a significant decrease in the surface hardness of acrylic re sins following the incorporation of ZnO (control group: 12 7.62+2.53 g/mm2, zinc oxide group: 106.67+ 1.51). Conc lusions: The addition of zinc oxide at 1 % would decrease the surface hardness of acrylic resins.
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