title: Why a rigid tray is important to the putty wash silicone impression method.
mesh_terms: D003442:Crowns; D003760:Dental Impression Materials; D003761:Dental Impression Technique / Q000295:instrumentation*; D012826:Silicone Elastomers
chemical_list: D003760:Dental Impression Materials; D012826:Silicone Elastomers