Objectives: The present study was designed to evaluate flexural strength, microhardness,andcolor stability of polyamideand conventional heat-cured acrylicresins after the addition of titaniananorods.
Methods: Polyamide(Group I) and heat-curedacrylic (Group II)resins were used in this study and both were modified withtitaniananorodsat different concentrationsas follows: 0 wt%, 0.1wt%, 0.5wt%, 1 wt% for the subgroups A, B, C, D respectively. Flexural strength, microhardness,and color stabilityhave been investigated for all specimens of Group I and II.The data were statistically analyzed by one-way ANOVA and Tukey's HSD analysis at a significance factor of α = 0.05.
Results: For the flexural strength and microhardness test the highest value was for heat-cured acrylic resin specimens modified with 1% titania (Group II subgroup D), while the lowest value was for polyamide specimens without modification (Group I subgroup A). For color stability, the lowest color changevalue was for polyamide specimens modified with 0.1% titania (Group I subgroup B), while the highest color change value was for heat-cured specimens modified with 1% titania (Group II subgroup D), all color changes were in the acceptable range (slight change).
Conclusions: Within the limits of this study, titaniananorodshave increased both flexural strength and microhardness of both polyamide and heat-curedacrylic resins as the concentration increase.Titaniananorodshave to affect the color stability of heat-curedacrylic resin more than that of polyamide resin as the concentration increase. Heat-cured acrylic resins showed higher flexural strength and microhardness than polyamide ones.