title: Effect of tray space on the accuracy of monophasic polyvinylsiloxane impressions.
abstract: The effect of tray space on the dimensional accuracy and stability of impressions made from four brands of monophasic polyvinyl siloxane material was assessed on the recovered stone casts by quantitative and qualitative methods. In general, both evaluation methods agreed that tray space and repeat pour did not affect the accuracy of the dies for individual castings. But disagreement was observed in the findings for fixed partial dentures (FPDs). Quantitative measurement of the interpreparation (IP) dimensions did suggest the possibility of a potential problem when a FPD is cast in one piece because of a significantly reduced distance between the two abutments. However, from the findings of this study it can be concluded that a rigid stock tray can be used with a monophasic polyvinyl siloxane impression material.
authors.affiliation: Loma Linda University, School of Dentistry, Calif.
authors.forename: A H
authors.initials: AH
authors.lastname: Tjan
authors.forename: H
authors.initials: H
authors.lastname: Nemetz
authors.forename: L T
authors.initials: LT
authors.lastname: Nguyen
authors.forename: R
authors.initials: R
authors.lastname: Contino
mesh_terms: D000704:Analysis of Variance; D002133:Calcium Sulfate / Q000737:chemistry; D003442:Crowns; D000044:Dental Abutments; D003760:Dental Impression Materials / Q000737:chemistry*; D003761:Dental Impression Technique / Q000295:instrumentation*; D003830:Denture, Partial, Fixed; D004867:Equipment Design; D006047:Gold Alloys / Q000737:chemistry; D008422:Materials Testing; D003765:Models, Dental; D011145:Polyvinyls / Q000737:chemistry*; D012833:Siloxanes / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D003760:Dental Impression Materials; D006047:Gold Alloys; D011145:Polyvinyls; D012833:Siloxanes; C034183:vinyl polysiloxane; D002133:Calcium Sulfate