Oxidation of four palladium-rich ceramic fusing alloys

Hautaniemi, J. A.; Junanoja, J.T.; Suoninen, E.; Yli‐Urpo, Antti

doi:10.1016/0142-9612(90)90054-t

Cited by 14 publications

(4 citation statements)

References 20 publications

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“…Chong et al (7), using the same type of shear testing for evaluation of Ni-Cr alloys, obtained bond strengths of around 30 MPa. Other authors (8,11,17) using the same test type with slight methodological alterations, found bond strengths of 15 to 60 MPa. It can be inferred from these findings that even when a similar bond strength test is used, the results can vary greatly due mainly to the lack of methodology standardization for evaluation of porcelain-fused-to-metal union.…”

Section: Discussionmentioning

confidence: 83%

“…However, there are other elements in the alloy composition such as silver and tin, which are susceptible to oxidation. Therefore, previous oxidation is an important procedure that may increase the bond strength at metal-ceramic interface (9,12,(15)(16)(17)(18). Previous oxidation has been shown to result in emergence of silver nodules that can undergo volatilization (9,12,(16)(17)(18), On the other hand, the presence of silver vapors may cause ceramic spotting or darkening.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of ceramic-to-metal bonding

et al. 2007

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Dentists and technicians have used dental ceramics associated with different types of alloys without taking into account the characteristics of compatibility of these materials. Knowing the properties of the alloy and ceramic used in metal/ceramic restorations is a key factor for treatment success. The purpose of this study was to evaluate the bond strength of a palladium-silver alloy (Pors-on 4) to 3 ceramics (Ceramco, Noritake and Vita VMK-68) using shear forces at the metal-ceramic interface. A stainless steel cylindrical matrix was used for preparation of the metal dies, application of ceramic and shear strength testing. Thirty palladium-silver alloy cylinders received two layers of opaque and two layers of body porcelain, and shear tests were performed in a universal testing machine at a cross-head speed of 0.5 mm/min. Shear bond strength means (in MPa) were: 28.21(Ceramco), 28.96 (Noritake) and 24.11 (Vita VMK-68). One-way ANOVA did not show statistically significant differences (p>0.05) among the materials. The results of this study indicate that the three evaluated ceramic systems are suitable to be used in combination with the tested palladium-silver alloy.

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Section: Discussionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Comparative study of ceramic-to-metal bonding

et al. 2007

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“…The inevitable element loss in the melting process might be responsible for the slight decline of metal-ceramic bond strength. For example, in the Pd-Cu-Ga group, the peak of Ga in third recasting, which is the foundation of the metal-ceramic combination by bonding with Cu [17,18], was lower than that in first and second recastings. It also has been reported that after recasting 7 times in a vacuum-conditions, Zn and Sn in high noble alloy declined significantly by 50% and 100%, respectively.…”

Section: Discussionmentioning

confidence: 90%

The Influence of Recycling on the Properties of Interface between Ceramic and Dental Alloys

Wang

Huang

Lin

et al. 2020

BioMed Research International

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Statement of Problem. Results are discrepant regarding the metal-ceramic interface of dental alloys affected by recycling. Purpose. The purpose of this study was to evaluate the effect of recycling on the properties of interface between 2 dental alloys and their corresponding porcelains. Materials and Methods. Noble alloy (Pd-Cu-Ga) and high-noble alloy (Au-Pt) were used in this study. Metal matrices (cylinders Φ4 mm×4 mm with pedestal Φ5 mm×1 mm) were prepared by arc melting in argon after recasting 1-3 times. Corresponding porcelain with overall dimensions of Φ4 mm×2 mm was veneered on each metal cylinder. There were 22 specimens in each alloy group. Specifically, two specimens of each group were chosen randomly for interfacial morphology and diffusion analyses by scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectroscopy (EDS). The remaining 20 specimens were divided into 2 groups with or without thermal cycling. The bond strength was evaluated by shear test, and the data were analyzed by two-way analysis of variance (ANOVA). The failure mode of shear test specimen was observed with a stereoscopic microscopy and subjected to the exact probability test (α=0.05). Results. According to the results from SEM, no obvious difference was observed in the interfacial morphology of both Pd-Cu-Ga and Au-Pt alloys among different recasting specimens. EDS analysis revealed that no significant difference was found in the width of elemental diffusion among 2 test alloys after recycling 1-3 times. Notably, in Pd-Cu-Ga alloy groups, the peak of Ga in thrice recasting was lower than those in first and second recastings. And there was no significant difference (P>0.05) in the metal-ceramic shear bond strength of Pd-Cu-Ga and Au-Pt alloys after recycling 1-3 times, with or without thermal cycling. The results of failure modes observed on specimens were not affected by the recycling and thermal cycling in the 2 tested alloys. Conclusions. Within the limitations of this study, the Pd-Cu-Ga and Au-Pt alloys can be recycled 2 times without significant changes on the properties of metal-ceramic interface, with or without thermal cycling.

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“…Suoninen and Herø 21 studied another Pd–Cu alloy and found only a 15‐μm‐thick gallium oxide layer in a subsurface region dispersed within the alloy and around its grain boundaries. However, Hautaniemi et al 22 investigated another Pd–Cu alloy and reported that CuGa 2 O 4 predominantly formed on the surface layer, along with some internal oxidation occurring to a depth of 10 μm.…”

Section: Noble‐metal Metal‐ceramic Alloysmentioning

confidence: 99%