Metallurgical aspects and corrosion behavior of yellow low-gold alloys

Mezger, P.R.; Stols, A.L.H.; Vrijhoel, M.M.A.; Greener, E.H.

doi:10.1016/0109-5641(89)90129-2

Cited by 15 publications

(4 citation statements)

References 7 publications

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“…In simulated body fluids and oral environments, gold alloy would not be prone to pitting or crevice corrosion [14]. Corrosion resistance of dental casting alloys with reduced noble metal content is generally inferior to that of alloys with noble metal content greater than 75 wt% [15,16]. Increased corrosion can occur because of lower noble metal content, formation of multiple phase microstructures, or segregations of elements such as silver and copper [17].…”

Section: Biodegradation and Corrosionmentioning

confidence: 97%

Biocompatibility of dental alloys used in dental fixed prosthodontics

Elshahawy

Watanabe

2014

Tanta Dental Journal

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Many different types of alloys are now available in the market to be used for dental restorations and fixed prostheses. The common criterion for all these fixed prosthodontic materials is the permanent existence of them in the oral cavity for prolonged time without the ability to be removed by the patient. Therefore, knowledge about the biocompatibility of dental alloys is of great importance. This article presents a literature review on the biocompatibility of dental alloys. A PubMed database search was conducted for studies pertaining to the biocompatibility of dental alloys. The search was limited to peer-reviewed articles published in English between 1985 and 2013. Available data revealed that substances are released from alloys into the surrounding tissues; mainly nickel, zinc, and copper. Some alloys such as nickelechromium alloy have shown to be cytotoxic in vitro. Also, elements released from gold alloy showed in vitro cytotoxic effect. Therefore, clinicians should give up assuming that gold alloy is completely inert and biocompatible with oral tissues. The clinical relevance of these findings remains unclear. Further in vitro studies, as well as controlled clinical trials, are needed due to possible exceptions.

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Section: Biodegradation and Corrosionmentioning

confidence: 97%

Biocompatibility of dental alloys used in dental fixed prosthodontics

Elshahawy

Watanabe

2014

Tanta Dental Journal

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“…Several factors can influence the corrosion resistance of dental alloys, with the main factor being the alloy's elemental composition. Previous corrosion studies have reported that low‐ or no‐gold alloys presented increased ion leaching compared with high‐gold alloys . High noble and noble alloys are more resistant to corrosion than are base metal alloys and therefore gold is commonly used because of its high corrosion resistance .…”

Section: Discussionmentioning

confidence: 99%

Corrosion behavior of dental alloys used for retention elements in prosthodontics

Nierlich

Papageorgiou

Bourauel

et al. 2016

European J Oral Sciences

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The purpose of this study was to investigate the corrosion behavior of 10 different high noble gold-based dental alloys, used for prosthodontic retention elements, according to ISO 10271. Samples of 10 high-noble and noble gold-based dental alloys were subjected to: (i) static immersion tests with subsequent analysis of ion release for eight different elements using mass spectrometry; (ii) electrochemical tests, including open-circuit potential and potentiodynamic scans; and (iii) scanning electron microscopy, followed by energy-dispersive X-ray microscopy. The results were analyzed using one-way ANOVA and Sidak multiple-comparisons post-hoc test at a level of significance of = 0.05. Significant differences were found among the 10 alloys studied for all ions (P < 0.001). The potentiodynamic analysis showed values from -82.5 to 102.8 mV for the open-circuit potential and from 566.7 to 1367.5 mV for the breakdown potential. Both the open-circuit and the breakdown potential varied considerably among these alloys. Scanning electron microscopy analysis confirmed the existence of typically small-diameter corrosion defects, whilst the energy-dispersive X-ray analysis found no significant alteration in the elemental composition of the alloys. The results of this study reveal the variability in the corrosive resistance among the materials used for retention elements in prosthodontics. AbstractThe purpose of this study was to investigate the corrosional behavior of ten different high noble gold-based dental alloys used for prosthodontic retention elements according to ISO 10271. Samples of ten high-noble and noble gold-based dental alloys were subjected to (a) static immersion tests with subsequent analysis of ionrelease for eight different elements using mass spectrometry, (b) electrochemical tests including open-circuit potential and potentiodynamic scans, and (c) scanning electron microscopy, followed by energy-dispersive Xray microscopy. The results were analyzed with one-way ANOVA and Sidak multiple comparisons post hoc test at α = 0.05 level of significance. Significant differences were found among the ten alloys studied for all ions (P<0.001). The potentiodynamic analysis showed values from -82.5 to 102.8 mV for the open-circuit potential and from 566.7 to 1367.5 mV for the breakdown potential. Both the open-circuit and the breakdown potential varied considerably among these alloys. SEM analysis confirmed the existence of typically small-diameter corrosion defects, while the energy-dispersive X-ray analysis found no significant alteration in the element composition of the alloys. The results of this study reveal the variability in the corrosive resistance among the materials used for retention elements in prosthodontics.3

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“…Due to the thermodynamic stability of Ag and Cu sulfides, silver and sterling silver are subject to darkening of the metal or alloy surface, a process called tarnishing, which is of great importance in the jewelry and dental applications. The alloys that are sensitive to these processes include primarily alloys with high silver content and alloys with low content of gold or platinum-group metals, with or without silver in its composition [1][2][3]. This phenomenon is mainly linked to atmospheric corrosion, but it also occurs in corrosion in solutions, due to the influence of sweat or saliva.…”

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confidence: 99%