Ion release from experimental Au–Pt-based metal–ceramic alloys

Abstract

Objective The aim of the study was to assess the effect of individual metallic elements within experimental Au-Pt-based dental alloys for porcelain veneering on ion release.Methods A binary Au-10 at% Pt alloy (AP10) was designed as a parent alloy. Six

Ion release from metal-ceramic alloys in three different media

“…Some alloying combinations may result in synergistic effects which alter the elements' lability and thus increase or decrease the ion release rate 2,3,5,6,22,28,29) . Ni, Cr, Mo, and Co had a decreasing effect on the corrosion rate of base metal alloys 5,17,24,[30][31][32] , whereas Fe had an increasing effect 10,24) . The ion release results of WBC, W99, and RTI in the present study (Figs.…”

“…Elements such as beryllium (Be), cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), iron (Fe), nickel (Ni), palladium (Pd), and vanadium (V) are known to be toxic, allergic, or mutagenic, and they should be used in lower ratios in dental alloys 6) . Several studies have measured the release of metallic ions from dental alloys of different alloy compositions 1,[4][5][6][8][9][10] . For many Ni-based dental casting alloys, Ni was the main element released while other major elements (Cr and molybdenum (Mo)), which are considered less toxic, were released at much lower concentrations 8) .…”

“…Studies have shown that dental alloys which contained less than 50% of noble metals exhibited tarnish and corrosion 2,13) . Therefore, biological risks can be kept to a minimum with the use of high-noble and noble alloys because ion release from these alloys is lower 1,2,10,[13][14][15] . Nonetheless, there were conflicting reports on ion release behavior from noble alloys in low pH conditions, which could be attributed to differences of the environment surrounding the tested alloys 12) .…”

“…Nonetheless, there were conflicting reports on ion release behavior from noble alloys in low pH conditions, which could be attributed to differences of the environment surrounding the tested alloys 12) . On one hand, it was reported that low pH caused ion release from Au alloy to increase; on the other hand, it was also reported that noble alloys were not significantly affected by a low pH 10,12) . Titanium (Ti) and its alloys have become one of the backbone materials for many applications today because of their combination of high strength-to-weight ratio, excellent mechanical properties, and corrosion resistance.…”

“…Although Ti and its alloys are hypoallergenic and possess many of the clinically favored properties of type III and type IV Au dental alloys, their use is largely limited by their relatively high cost 16) . Ion release from dental alloys has been evaluated mainly by in vitro studies using these methods: cell culture media 1,8,15,17) , galvanism 18) , electrolyte baths 19) , evaluation of the influence of oral proteins on corrosion behavior 2,20) , exposure to different pH levels 2,3,5,10,20,21) , use of different surface treatments to cast alloys 9,13) , and power toothbrushing with toothpastes of different abrasivities 22) . In general, a static system is the most frequently used method to monitor the elements released from dental casting alloys.…”