Study of Pd-Ag dental alloys: examination of effect of casting porosity on fatigue behavior and microstructural analysis.

Journal of Materials Science. Materials in Medicine
D LiG S Daehn

Abstract

The goals of this study were to investigate the fatigue limits of two Pd-Ag alloys (Ivoclar Vivadent) with differing mechanical properties and varying proportions of secondary alloying elements, examine the effect of casting porosity on fatigue behavior, and determine the effect of casting size on microstructures and Vickers hardness. The alloys selected were: IPS d.SIGN 59 (59.2Pd-27.9Ag-8.2Sn-2.7In-1.3Zn); and IS 64 (59.9Pd-26.0Ag-7.0Sn-2.8Au-1.8 Ga-1.5In-1.0Pt). Tension test bars, heat-treated to simulate dental porcelain application, were subjected to cyclic loading at 10 Hz, with R-ratio of -1 for amplitudes of compressive and tensile stress. Two replicate specimens were tested at each stress amplitude. Fracture surfaces were examined with a scanning electron microscope (SEM). Sectioned fatigue specimens and additional cast specimens simulating copings for a maxillary central incisor restoration were also examined with the SEM, and Vickers hardness was measured using 1 kg load. Casting porosity was evaluated in sectioned fatigue fracture specimens, using an image analysis program. The fatigue limit (2 × 10(6) loading cycles) of IS 64 was approximately 0.20 of its 0.2% yield strength, while the fatigue limit of d.SIGN 59 wa...Continue Reading

References

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Jan 4, 2007·Journal of Materials Science. Materials in Medicine·Dongfa LiGlenn S Daehn

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Citations

May 30, 2012·Brazilian Oral Research·José Roberto de Oliveira BauerAlessandro Dourado Loguercio
Jun 9, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·M HoffmannK Kokko
Mar 5, 2020·Biomaterial Investigations in Dentistry·Håvard Jostein HaugenGaute Floer Johnsen
May 5, 2020·Journal of the Mechanical Behavior of Biomedical Materials·Hye-Jeong ShinHyo-Joung Seol
Apr 6, 2021·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Desheng SunWilliam M Johnston

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