in the present invention dental prostheses are cured without the use of dental flasks using an electrically heated pressure vessel . the dental prosthesis is cured while in a plaster chamber which is placed in a curing container with ambient water . the apparatus includes a perforated table for supporting the curing container during heat curing . the vessel has a lid for sealing the top , an inlet for injection of compressed air , an outlet for exhausting of compressed air , and an electrical resistance heating means for heating water held in the vessel . the curing container holds ambient temperature water at a level which covers the plaster chamber prior to submerging the curing container in the vessel containing water at a temperature of 90 ° c . to 100 ° c . the table supports the curing container in the vessel so that the top edge of the curing container is above the level of water held by the vessel . the present invention provides that the plaster chambers with the dental prosthesis inside of it being already aggregated heat curing acrylic , are those which maintain the vertical dimension . they are within the curing container while they are gradually heated by the hot water of the processor . pressure which could fracture the model and the prosthesis is avoided .