Kit: 3.5 lb Jar Base Putty, 3 x 20 ml Tubes Catalyst Paste Fillers (Colloidal silica or titanium dioxide) (white) Catalyst paste 1. These are condensation and addition silicone. With regard to impressions, for example, silicone is used in cases of root canals, soft structures and bone tissues, in addition to implants and functional impressions of full dentures. – They are the most accurate, stable, and expensive impression materials. Composition: Base paste 1. - works better with gypsum than elastomeric impression materials. Silicone impression materials that set by condensation polymerization contain an accelerator consisting of a stannous sulfate. Composition of Polysulfide Impression Materials. Condensation silicones. There are two types of silicone impression material, addition and condensation (reflecting each of their setting reactions). Types of Silicone Rubber. sions : addition silicone, condensation silicone, polysul-fide and polyether (18,21,28). The fabri-cation of a casting requires an impression material that LMW silicone polymer with terminal OH groups 2. 2 paste system (base and accelerator. This premium impression material offers excellent technical properties such as very low shrinkage and … Silicone, being a more elastic material, allows for more uses for dentists than alginate. Condensation SiliconeCondensation Silicone Impression MaterialImpression Material 11. – They are clean and do not have an unpleasant taste or smell. Zetaplus System, Zhermack’s first ever silicone range, has been on the market for over 30 years and provides a versatile solution to the diverse demands of daily clinical practice. Our best C-silicone – SILECT® – was developed using our many years of experience and chemical expertise and employing state-of-the-art production technologies. Addition silicones have become the most used impression material in advanced restorative dentistry. Silicones are inherently hydrophobic and as such require excellent moisture control for optimal use. In the 1950s the rubber base materials, first in the form of the polysulfide and later the silicone, began to be used as dental impression materials (9). polymerize more slowly liberate ethyl alcohol as a byproduct of the polymerization reaction undergo high shrinkage during the first 24 hours. CHEMISTRY A. Addition silicone. Darby's Condensation Silicone Putty is a two part base/catalyst impression system that is soft and malleable during mixing. A dental precise impression material comprises condensation or addition type room temperature-vulcanizing silicone, and further contains 0.1 to 10.0 weight % of at least one protein soluble or slightly soluble in water optionally with 0.05 to 5.0 weight % of at least one hydrophilic nature-affording agent selected from hydrophilic silicone oils and nonionic surface active agents. 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