comparison of the effect of metallic nano-particles on the water contact angle of composite resin

statement of the problem addition of metallic nano-particles to composite resins can change their water contact angle purpose the aim of this study was to evaluate the effect of addition of nano-particles of silver and zinc oxide to composite resins on their water contact angle materials and methods this in vitro study was performed on 60 composite resin samples. nano-silver and nano-zinc oxide were added to composite resin at 0.5% and 1% by weight. sem-edx analysis was performed to confirm the homogeneity of the nano-particle distribution. composite resin discs were made in molds measuring 10 mm in diameter and polished with silicon carbide papers. water contact angle measurements were performed on 4 points on the surface of each sample, and the mean of the points was reported as the water contact angle of the sample. two-way anova, followed by the tukey-hsd test and independent t-test with a significance level of 5%, were used for data analysis results the addition of nano-particles caused a reduction in the contact angle between water and composite resin (p=0.000). the interaction of the type of nano-particle and its concentration on the contact angle was significant (p=0.000). water contact angle varied depending on the type of nano-particle (p=0.000) and its concentration (p=0.028). conclusion addition of silver and zinc-oxide nano-particles to composite resin reduced the water contact angle of composite resin