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Investigation on the compressive strength of several gypsum products dried by microwave oven with different programs. 1993

N Tuncer, and H B Tufekçioglu, and S Calikkocaoglu
Department of Removable Prosthodontics, University of Istanbul, Faculty of Dentistry, Turkey.

Different programs in a microwave oven were selected to dry several gypsum products. A type III dental stone (Moldano), a type IV high-strength dental stone (Glastone) and a type III partial denture casting investment (Multi-vest) were selected. Specimens of the products were dried by microwave radiation set at the lowest and highest power levels for 5 and 15 minutes. The dried specimens were tested at intervals of 2, 4, 24, and 48 hours for compressive strength. Specimens dried in ambient room air were used as the control group. A statistical analysis of the test results was performed with Student's t-test at p < or = 0.05 level. Microwave radiation at the highest power level resulted in a decrease in the compressive strength of type IV dental stone (Glastone), whereas the values of the other gypsum products did not differ at any time interval from values attained for the air-dried specimens. The 2-hour low power test of the investment (Multi-vest) had a higher compressive strength than the air-dried specimens after 24 hours.

UI MeSH Term Description Entries
D008422 Materials Testing The testing of materials and devices, especially those used for PROSTHESES AND IMPLANTS; SUTURES; TISSUE ADHESIVES; etc., for hardness, strength, durability, safety, efficacy, and biocompatibility. Biocompatibility Testing,Biocompatible Materials Testing,Hemocompatibility Testing,Testing, Biocompatible Materials,Testing, Hemocompatible Materials,Hemocompatibility Testings,Hemocompatible Materials Testing,Materials Testing, Biocompatible,Materials Testing, Hemocompatible,Testing, Biocompatibility,Testing, Hemocompatibility,Testing, Materials,Testings, Biocompatibility
D008872 Microwaves That portion of the electromagnetic spectrum from the UHF (ultrahigh frequency) radio waves and extending into the INFRARED RAYS frequencies. EHF Waves,Extremely High Frequency Radio Waves,Micro Wave,Micro Waves,Ultrahigh Frequency Waves,Microwave Radiation,EHF Wave,Micro Waves,Microwave,Microwave Radiations,Radiation, Microwave,Ultrahigh Frequency Wave,Wave, EHF,Wave, Micro,Wave, Ultrahigh Frequency,Waves, Micro
D002133 Calcium Sulfate A calcium salt that is used for a variety of purposes including: building materials, as a desiccant, in dentistry as an impression material, cast, or die, and in medicine for immobilizing casts and as a tablet excipient. It exists in various forms and states of hydration. Plaster of Paris is a mixture of powdered and heat-treated gypsum. Dental Gypsum,Dental Stone, Artificial,Gypsum,Plaster of Paris,Alabaster,Anhydrous Sulfate of Lime,Artificial Dental Stone,Calcium Sulfate (1:1), Dihydrate,Calcium Sulfate (1:1), Hemihydrate,Calcium Sulfate (2:1),Calcium Sulfate Dihydrate,Calcium Sulfate, Anhydrous,Calcium Sulfate, Dihydrate,Calcium Sulfate, Hemihydrate,Calcium Sulphate,Drierite,Gypsite,Gypsum, Dental,Karstenite,Stone, Artificial Dental
D002627 Chemistry, Physical The study of CHEMICAL PHENOMENA and processes in terms of the underlying PHYSICAL PHENOMENA and processes. Physical Chemistry,Chemistries, Physical,Physical Chemistries
D003734 Dental Casting Investment Material from which the casting mold is made in the fabrication of gold or cobalt-chromium castings. (Boucher's Clinical Dental Terminology, 4th ed, p168) Casting Investment, Dental,Casting Investments, Dental,Dental Casting Investments,Investment, Dental Casting,Investments, Dental Casting
D003748 Dental Equipment The nonexpendable items used by the dentist or dental staff in the performance of professional duties. (From Boucher's Clinical Dental Terminology, 4th ed, p106) Equipment, Dental,Dental Equipments,Equipments, Dental
D003890 Desiccation Removal of moisture from a substance (chemical, food, tissue, etc.). Dessication
D006244 Hardness The mechanical property of material that determines its resistance to force. HARDNESS TESTS measure this property. Hardnesses
D006813 Humidity A measure of the amount of WATER VAPOR in the air. Humidities
D000388 Air The mixture of gases present in the earth's atmosphere consisting of oxygen, nitrogen, carbon dioxide, and small amounts of other gases.

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