title: Defects in automixed addition silicone elastomers prepared by putty-wash impression technique.
abstract: Voids presenting in impressions of five automixed addition silicone elastomers were investigated. Impressions were prepared with the putty-light body impression technique on stainless-steel cylinders with acrylic spacers. The number of voids was counted at a predetermined site on three separate days using a stereomicroscope at x7 magnification. Impression specimens of a hand-mixed addition silicone, and from hand-mixing of the automixed materials, were made for comparison. Express gave a significantly higher number of voids than other automixed materials, with President Jet having the lowest void count. Automixed materials generally produced impressions with significantly fewer voids than the hand-mixed material. Automixing was effective in reducing void defects in elastomeric impressions.
authors.affiliation: Department of Preventive Dentistry, National University of Singapore, Kent Ridge.
authors.forename: G
authors.initials: G
authors.lastname: Soh
authors.forename: Y H
authors.initials: YH
authors.lastname: Chong
mesh_terms: D003760:Dental Impression Materials / Q000737:chemistry*; D003761:Dental Impression Technique; D008422:Materials Testing; D011145:Polyvinyls / Q000737:chemistry; D012826:Silicone Elastomers / Q000737:chemistry*; D012833:Siloxanes / Q000737:chemistry; D013499:Surface Properties; D014783:Viscosity
chemical_list: D003760:Dental Impression Materials; D011145:Polyvinyls; D012826:Silicone Elastomers; D012833:Siloxanes; C034183:vinyl polysiloxane