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). Addition silicones have become the most used impression material in advanced restorative dentistry. Composition of Polysulfide Impression Materials. 2 paste system (base and accelerator. polymerize more slowly liberate ethyl alcohol as a byproduct of the polymerization reaction undergo high shrinkage during the first 24 hours. LMW silicone polymer with terminal OH groups 2. 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. Addition silicone. A silicone mold lends itself well for resin or plaster casting, as well Skin safe and food safe silicone mold rubbers are also available. Silicone impression materials that set by condensation polymerization contain an accelerator consisting of a stannous sulfate. Addition Silicones – Addition silicones are the most popular type of elastomeric impression material, especially for crown and bridge impressions. Kit: 3.5 lb Jar Base Putty, 3 x 20 ml Tubes Catalyst Paste – They are the most accurate, stable, and expensive impression materials. It is useful in processing cold cure acrylic partials, repairs, relines and denture re-bases. When should they be used? This premium impression material offers excellent technical properties such as very low shrinkage and … sions : addition silicone, condensation silicone, polysul-fide and polyether (18,21,28). The fabri-cation of a casting requires an impression material that Types of Silicone Rubber. Condensation SiliconeCondensation Silicone Impression MaterialImpression Material 11. Composition: Base paste 1. – They are clean and do not have an unpleasant taste or smell. Silicone, being a more elastic material, allows for more uses for dentists than alginate. ... 2. condensation silicone 3. polyethers 4. addition silicone. Condensation silicones. Alkyl silicate (Cross linking) 2. – Addition silicone impression materials are also called vinyl polysiloxanes and […] Darby's Condensation Silicone Putty is a two part base/catalyst impression system that is soft and malleable during mixing. Our best C-silicone – SILECT® – was developed using our many years of experience and chemical expertise and employing state-of-the-art production technologies. CHEMISTRY A. - works better with gypsum than elastomeric impression materials. These are condensation and addition silicone. 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. Silicones are inherently hydrophobic and as such require excellent moisture control for optimal use. 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