title: Casting without metal rings for unimpeded expansion of the investment mold.
mesh_terms: D002133:Calcium Sulfate; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002858:Chromium Alloys; D003734:Dental Casting Investment; D003735:Dental Casting Technique / Q000295:instrumentation; D006047:Gold Alloys; D003765:Models, Dental
chemical_list: D002858:Chromium Alloys; D003734:Dental Casting Investment; D006047:Gold Alloys; D002133:Calcium Sulfate