Effect of surface treatments on the wettability of vinyl polysiloxane impression materials

The Journal of Prosthetic Dentistry
R S KessB S Sparks


A number of vinyl polysiloxane (VPS) impression materials are claimed to be hydrophilic, but it has been hypothesized that the degree of hydrophilicity may be altered by the exposure to saliva, disinfecting agents, and surfactants. This study compared the effects of 6 treatment regimes on the hydrophilicity of 3 VPS materials. Three VPS materials (Dimension Garant L, Hydroflex, Imprint II, referred to as G, H, and I, respectively) were each treated with: (1) nothing (control), (2) saliva, (3) saliva and NaOCl, (4) saliva and 2-propanol-based disinfectant, (5) saliva, NaOCl and surfactant, and 6) saliva, 2-propanol-based disinfectant, and surfactant. Advancing contact angles (thetaA) were measured using a Cahn Dynamic contact angle analyzer and WinDCA software. Using saturated CaSO4 solutions, thetaA was determined for the 3 materials in each of the 6 conditions. For each combination of VPS and treatment, 5 determinations were made using fresh samples and fresh solution each time. Considerable contact angle hysteresis was observed. Two-way ANOVA was performed, followed by post-hoc Boneferroni-Dunn tests. For all outcome variables, the treatment effects were not the same for all materials (P < .001). However, for all materials, t...Continue Reading


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