An In Vitro Study Of The Effects Of Disinfectants And Wetting Agent On The Wettability Of Addition Polymerised Silicone Impression Materials And Void Formation In Dies
Background and Objectives: Polyvinyl siloxane impression materials, besides their excellent physical properties, have known to be variably hydrophobic, which has resulted in poor wettability and in an increased number of voids in gypsum casts. Disinfection procedures and surfactants have been known to affect the wettability of these impression materials. Hence, this study was conducted to evaluate the effects of various disinfectants and wetting agent on the wettability of various addition polymerised silicone impression materials and its correlation with void formation in dies. Method: Putty and light body consistencies of three different hydrophilic addition silicone impression materials namely Aquasil, Affinis and Express were selected. Sixty discs and 60 impressions of each material were made. The respective groups of samples were subjected to Cadicide and Cadidine disinfectant solutions and Aurofilm topical surfactant. The contact angle measurements were made using a Rame-Hart goniometer. Casts were examined using their magnified images on a computer screen and voids in the cross-hatched surface of the casts were counted and noted. The values of contact angle and number of voids obtained were tabulated and statistically analyzed by using ANOVA and t-test. Results: The results showed that the mean contact angle values and number of voids in gypsum casts of Aquasil and 3M Express impression materials increased on disinfection, but decreased on application of topical surfactant, whereas that of Affinis impression material was found to be relatively unchanged on disinfection, but decreased considerably on application of topical surfactant. A change in wettability as well as reduction in number of voids was found to be statistically significant on use of disinfectants and surfactant. Interpretation and conclusion: The wettability of the addition silicone impression materials is affected by disinfection and the application of a wetting agent improves their wettability. There is a positive correlation between the contact angle values and resultant number of voids in gypsum casts.
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