The purpose of this study was to evaluate the characteristics of five gold-silver-palladium alloys, six H.E dental casting alloys, three dental casting nickel-chromium alloys, four porcelain metals and four dental casting cobalt-chromium alloys
being
used in Korea.
The following properties were studied: Vicker's hardness, ultimate tensile strength, elongation rate, melting temperature and yield strength. These tests were performed according to the KDA Specification No. 6: Dental casting cobalt-chromium
alloys, KSP
5101: Dental nickel-chromium alloy plate, RANSI/ADA Specification No. 5: dental casting alloys, RANSI/ADA Specification No. 14: Dental base metal casting alloys, JIS T 6101: Dental casting gold-silver-palladium alloys, JIS T 6102: Dental nickel
chromium
alloy plate, ISO Specification No. 1562: Dental casting gold alloys and FDI Specification No. 7:Dental casting gold alloys.
@ES From the experiments, the following results can be drawn:
@EN In case of the dental casting gold-silver-palladium alloys, the Vicker's hardness number was VHN 171 to VHN 229, the ultimate tensile strength was 633.1±148.5 MPa to 771.9±29.5 MPa, the elongation rate was 19.7% to 23.3%, the yield strength
was
616.0+141.3MPa to 751.0±20.4 MPa and the melting temperature range was 937℃ to 1,221℃.
2) In case of the H.E dental casting alloys, the Vicker's hardness number was VHN 120 to VHN 234, the ultimate tensile strength was 329.4 MPa to 681.5 MPa, the elongation rate was 14.0% to 38.9%, theyield strength was 304.9 MPa to 820.1 MPa and
the
melting temperature range was 899℃to 1,125℃.
3) In case of the dental casting nickel-chromium alloys, the Vicker's hardness number was VHN 77 to VHN 106, the ultimate tensile strength was 473.6±34.0 MPa to 501.7±31.7 MPa, the elongation rate was 16.11% to 75.36% and the yield strength
was
430.1±40.8 MPa to 450.9±48.6MPa.
4) In case of the dental porcelain alloys, the Vicker's hardness number was VHN 206 to VHN 300, the ultimate tensile strength was 784.3±12.1 MPa to 1,114.8±24.5 MPa, the elongation rate was 20.40% to 39.10% and the yield strength was
749.2±11.3
MPa
to 1,049.7±23.6 MPa.
5) In case of the dental casting cobalt-chromium casting alloys, the Vicker's hardness number was VHN 155 to VHN 266, the ultimate tensile strength was 671.8±339.8 MPa to 876.8±26.2 MPa, the elongation rate was 16.77% to 24.46% and the yield
strength
676.1±295.9MPa to 841.7±34.6MPa.
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