Observations on gold-palladium-silver and gold-palladium alloys

Vermilyea, Stanley G.; Huget, Eugene F.; Vilca, Jesus M.

doi:10.1016/0022-3913(80)90015-3

Cited by 13 publications

(6 citation statements)

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“…By the subsequent simulated firing schedule of the main bake, correction and glaze, the hardness decreased gradually and finally became similar to that of the as-cast state (226.9 HV). From the above, the porcelain firing full cycle did not result in hardening of the as-cast specimen [11], unlike the case of the Au-Pt and Au-Pd-Ag metal-ceramic alloys [9,10,12]. After the pre-firing heat treatment after casting, the hardness decreased to 207 HV [10,13].…”

Section: Resultsmentioning

confidence: 99%

Hardening effect of pre- and post-firing heat treatment for a firing-simulated Au-Pd-In metal-ceramic alloy

Jeon

Kim

et al. 2014

Gold Bull

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The hardening effect of the pre-and post-firing heat treatments and their dual treatment was examined for a firingsimulated Au-Pd-In metal-ceramic alloy to determine if an additional post-firing heat treatment is effective in the hardening of an Au-Pd-In metal-ceramic alloy as well as to compare the hardening effects of pre-and post-firing heat treatments for a firing-simulated Au-Pd-In metal-ceramic alloy. The postfiring heat treatment was much more effective than the prefiring heat treatment or dual treatments. The hardening effect of the pre-and post-firing heat treatments was caused by the induction of fine grain interior precipitation. In the pre-firing heat-treated specimen after casting, the apparent hardening was achieved during simulated porcelain firing, but an additional post-firing heat treatment did not introduce severe grain interior precipitation, resulting in very weak hardening. In the as-cast specimen without the pre-firing heat treatment, apparent hardening by grain interior precipitation was achieved only by post-firing heat treatment and not by simulated porcelain firing.

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Section: Resultsmentioning

confidence: 99%

Hardening effect of pre- and post-firing heat treatment for a firing-simulated Au-Pd-In metal-ceramic alloy

Jeon

Kim

et al. 2014

Gold Bull

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“…The three Pd–Ag alloys 19 . and the Au–Pd alloy 20 have multi‐phase microstructures with fine‐scale dendrites or equiaxed grains in the simulated porcelain‐firing condition. Specimens were metallographically ground and polished on both sides to 0.05 μm surface roughness which provided a standardized surface condition, and ultrasonically cleaned in distilled water and ethanol.…”

Section: Methodsmentioning

confidence: 99%

Electrochemical impedance spectroscopy study of corrosion characteristics of palladium–silver dental alloys

et al. 2021

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Electrochemical impedance spectroscopy (EIS) has been used to obtain insight into corrosion processes for three Pd–Ag alloys, and compare their behavior with an Au–Pd alloy. Five specimens of each alloy received clinically‐appropriate simulated porcelain‐firing heat treatment. EIS testing was performed at ambient temperature, using 0.09% NaCl, 0.9% NaCl and Fusayama solutions. EIS data are presented as Bode plots. At the open‐circuit potential (OCP), the data fit a modified Randles equivalent electrical circuit with a constant phase element (CPE), and the charge‐transfer resistance (RCT) and the two CPE parameters (CPE‐T and CPE‐P) were determined. The area‐normalized capacitance of the double layer (Cdl) was also calculated. The EIS data at two relevant elevated potentials in the passive range were also found to fit well a modified Randles equivalent circuit with different values for the charge transfer resistance and CPE parameters. At the OCP no significant effect on RCT was found for the alloys and electrolytes, and both alloy and electrolyte significantly affected CPE‐P. In vitro corrosion was controlled by charge transfer and charge accumulation processes, and the behavior differed at the elevated potentials compared to the OCP. Significant effects were found for alloy, electrolyte, and alloy/electrolyte interaction on Cdl at the OCP. The EIS parameters at elevated potentials indicate that the Pd–Ag alloys should have satisfactory clinical corrosion resistance. The EIS analyses yielded information about in vitro corrosion of these alloys that cannot be obtained from potentiodynamic polarization testing.

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“…Peaks in Vickers hardness for heat treatments at temperatures that span the porcelain-firing temperature range indicate that influential precipitation processes can occur in some noble alloys for fixed prosthodontics [13,16]. For the gold-palladium-silver alloy in Table 1, heating an as-cast specimen to 980°C caused a pronounced decrease in Vickers hardness, and subsequent heat treatments at temperatures from 200° to 980°C revealed a pronounced peak in Vickers hardness at approximately 760°C.…”

Section: Alloys For Fixed Prosthodontics (Metal-ceramic Restorations)mentioning

confidence: 99%

“…Mechanical properties for two noble metal alloy types used with dental porcelain, comparing the as-cast condition (C) and simulated porcelain firing heat treatment (F) [13]. …”

Section: Alloys For Fixed Prosthodontics (Metal-ceramic Restorations)mentioning

confidence: 99%

“…For example, in one study heating of high-palladium alloys in the dental porcelain furnace was performed at approximately 30°C/min over a temperature range from 650°C to above 900°C, and the total heating time for the several firing cycles at these elevated temperatures was about 45 minutes [11]. Studies [13][14][15] have shown that the as-cast microstructures of noble metal alloys for bonding to porcelain are highly inhomogeneous in the initial as-cast condition, presumably from substantial elemental microsegregation that occurs during the rapid solidification involved with casting into much cooler investment [1,2]. After simulation of the dental porcelain firing sequence, the noble metal alloy microstructures become substantially homogeneous, and there are accompanying changes in the mechanical properties, as shown in Table 2.…”

Section: Alloys For Fixed Prosthodontics (Metal-ceramic Restorations)mentioning

confidence: 99%

See 1 more Smart Citation

Heat Treatment of Dental Alloys: A Review

Brantley¹,

Alapati²

2012

Metallurgy - Advances in Materials and Processes

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Observations on gold-palladium-silver and gold-palladium alloys

Cited by 13 publications

References 0 publications

Hardening effect of pre- and post-firing heat treatment for a firing-simulated Au-Pd-In metal-ceramic alloy

Hardening effect of pre- and post-firing heat treatment for a firing-simulated Au-Pd-In metal-ceramic alloy

Electrochemical impedance spectroscopy study of corrosion characteristics of palladium–silver dental alloys

Heat Treatment of Dental Alloys: A Review

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