![]() ![]() By using auto mixing impression gun (Dentsply/Caulk), which was loaded with prepacked cartridges of impression material, the impressions were made. Gloves have not used in this study as they inhibits polymerization process of elastomeric impression materials and also to avoid contamination of the die surface. The die was air dried and care had been taken to avoid contamination of the die surface. Prior to impression making, the die was cleaned ultrasonically so as to remove any residue. Monophase impression technique was completed in single step procedure by using medium viscosity impression materials whereas putty and light body wash impression was used to complete the dual phase (1-step and 2-step putty/light body) impression technique. Impression techniques can be classified into monophase and dual phase. Hence, certain intrinsic factors such as nonylphenoxypolyethanol homologues had been added by manufacturers to overcome the limitation of VPS hydrophobicity. #Pvs dental impression freeThe surface free energy of the unpolymerized, liquid phase of the impression material that lacks the ability to wet the oral tissues while impression making, forms the second aspect. The first aspect was related to surface free energy and the high contact angle of the solid polymerized VPS that had formed when polymerized VPS impression materials contact with the wet dental gypsum. There are two different aspects of the hydrophobic nature of VPS impression materials. Ī significant limitation of VPS impression material is their hydrophobicity. When compared with other types of impression materials, polyvinyl siloxane impression materials demonstrate superior dimensional stability, primarily because they do not release any by-product. These materials have low polymerization shrinkage, low creep, good dimensional stability and surface detail reproduction. VPS impression materials were introduced in 1970’s. ![]() ![]() Synthetic elastomeric impression materials that include polysulfide, condensation silicone, addition silicone and polyether. ![]()
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