title: The effect of impression-die systems on crown margins.
abstract: This study compared the adaptation of the margins of gold crowns produced from three impression-die combinations. Gold crowns were fabricated and cemented to prepared human teeth. After sectioning, the degree of margin opening was measured and the groups were compared. Crowns produced on silver dies from polysulfide impressions had a smaller margin opening than crowns made on dies of improved stone.
mesh_terms: D000180:Acrylic Resins; D003442:Crowns; D003735:Dental Casting Technique / Q000295:instrumentation*; D003737:Dental Cavity Preparation; D003760:Dental Impression Materials; D006801:Humans; D012117:Resins, Synthetic; D012408:Rubber; D012826:Silicone Elastomers; D013440:Sulfides; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D003760:Dental Impression Materials; C022821:Impregum; D012117:Resins, Synthetic; D012826:Silicone Elastomers; D013440:Sulfides; D012408:Rubber; C032915:polysulfide