Abstract
Abstract This study examines the effect of non-ionic surfactants on surface hydrophilicity and detail reproducibility of die stone for hydrophilic polyvinyl siloxane impression materials. Hydrophilic polyvinyl siloxane impression materials were prepared with a polydimethylsiloxane composition and non-ionic surfactants. The surfactants used were nonylphenoxy poly(ethyleneoxy) ethanol homologs of varying ethyleneoxy chain length. These homologs are designated NP4, NP6, and NP10 according to the mole number of ethyleneoxy group of 4, 6, and 10, respectively. The contact angle, consistency, linear dimensional accuracy, and detail reproducibility for hydrophilic polyvinyl siloxane impression materials were tested. The non-ionic surfactants used in this study contain a silicone-loving group (nonylphenoxy group) which makes the surfactant dispersible in the silicone prepolymer. The dispersion size of these surfactants in polyvinyl siloxane prepolymers was dependent on the HLB of each surfactant. The more hydrophobic (silicone-loving) a surfactant is, the smaller the dispersion size is obtained. The incorporation of non-ionic surfactant into polyvinyl siloxanes enhanced their surface hydrophilicity and consequently led to significant reduction in contact angles. Significant differences in contact angle were found among the samples (P
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