Corrosion of gold alloys and titanium in artificial saliva

Brune, Dag; Evje, Dag M.; Melsom, S.W.

doi:10.1111/j.1600-0722.1982.tb01541.x

Cited by 19 publications

(19 citation statements)

References 3 publications

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“…Compared with other non-noble dental alloys, pure Ti reportedly had better corrosion properties and biocompatibility 14,24,30) . In this study, RTI alloy showed moderate ion release in all the immersion solutionswhich could be attributed to a passive oxide film covering the titanium alloy surface.…”

Section: Corrosion Behavior Of Timentioning

confidence: 99%

“…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) .…”

Section: Introductionmentioning

confidence: 99%

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Ion release from metal-ceramic alloys in three different media

2011

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The aim of this in vitro study was to assess the effect of pH changes on ion release of metal-ceramic dental casting alloys. Samples from four commercially available alloys (Wirobond C, Wiron 99, Rematitan CP-Ti grade 1, and PontoStar) were prepared and polished. Ion release of alloys subjected to three different pH media (artificial saliva of pH 2.3, pH 6.5 and 0.9% saline solution of pH 7.3) for periods of 7, 15, 30, and 60 days were assessed by means of atomic absorption spectroscopy. Microscopic changes on surfaces of metallic samples before and after immersion were compared by scanning electron microscopy. ANOVA was used for statistical analysis of results. For all ions, pH and period interactions were statistically significant: highest amount of ion release occurred after 60 days of immersion regardless of pH value. For every alloy, ion release results were highest in artificial saliva of pH 2.3 and lowest in 0.9% saline solution. It was concluded that ion release from alloys was pH-dependent.

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Section: Corrosion Behavior Of Timentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ion release from metal-ceramic alloys in three different media

2011

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“…Titanium and titanium alloys have excellent chemical stability and exhibit corrosion resistance in various test solutions such as artificial saliva, Ringer' s solution, and physiological saline solution [14][15][16] . However, such corrosion resistance was lost in solutions which contain fluoride with varying pH values 17) .…”

Section: Discussionmentioning

confidence: 99%

“…These near-equiatomic NiTi alloys have many excellent properties such as adequate springback, low stiffness, superelasticity, and shape memory which are essential for orthodontic purposes [10][11][12][13] . NiTi alloys also have excellent biocompatibility with living tissue and corrosion resistance in various simulated body fluids and NaCl solutions [14][15][16] . These properties originate from the spontaneously formed oxide passivation layer.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fluoride Released from Fluoride-containing Dental Restoratives on NiTi Orthodontic Wires

Kwon

Jang

et al. 2008

Dent. Mater. J.

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The present study investigated the effect of fluoride released from dental restoratives on orthodontic NiTi wires. Five different restoratives (four fluoride-containing and one non-fluoride-containing) and four different NiTi wires were examined in this study. The pH of artificial saliva (AS) was adjusted to 2.5 and 6. Content of released fluoride was determined daily for 10 days. The morphology of wires was observed using a scanning electron microscope. After immersion for 10 days, the initial microhardness of the wires decreased by 0.3-5.6％ depending on the test solution. Dyract AP (DA) and F2000 (F2) (compomers) released significantly more fluoride than the other resin products (composite resins) regardless of the test solution. In pH 2.5 solution, both DA and F2 released 40-45 ppm/day fluoride for five to six days. As for the wires in contact, they did not show any visible modification in surface morphology. Therefore, despite the released fluoride, wires in contact with the fluoride-containing restoratives were not damaged regardless of the pH value of test solution.

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“…This corrosion resistance was confirmed in various simulated body fluids and NaCl solutions. [7][8][9] However, NiTi alloys showed an increased corrosion rate in solutions containing chlorine ions such as HCl and FeCl 3 . 2 Additionally, some NiTi wires have been reported to degrade and fracture in the oral cavity after setting.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the effect of fluoride‐containing acetic acid on NiTi wires

Kwon¹,

Cho²,

Noh³

et al. 2004

J Biomed Mater Res

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The possibility of the formation of hydrofluoric acid by the reaction of fluoride with acetic acid seems natural in the oral cavity. The effect of an acidic fluoride solution on NiTi wires was investigated by testing microhardness and color changes on wires. For aesthetic reasons, the color change on wires was also evaluated. Wires were immersed in four different test solutions for 1 or 3 days. As-received wires were used as a reference. After immersion for 3 days, the microhardness of the tested wires increased 1.8% to 10.4% compared to that of their as-received state. Wires immersed in a higher NaF concentration, lower pH solution with longer immersion yielded a more corroded surface than those of the counter cases. Wires showed a different color after immersion. However, after 3 days in solutions of pH 4, wires showed an appreciable color change regardless of the products. In test solutions, 3M wires showed the highest volumetric and percentage (0.59 for 0.05%; 1.19 for 0.2% solution) weight loss and G&H wires showed the least volumetric and percentage (0.43 for 0.05%; 1.05 for 0.2% solution) weight loss among tested wires. In pH 6 solutions, wires lost weight and were under the detection limit of the testing machine.

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Corrosion of gold alloys and titanium in artificial saliva

Cited by 19 publications

References 3 publications

Ion release from metal-ceramic alloys in three different media

Ion release from metal-ceramic alloys in three different media

Effect of Fluoride Released from Fluoride-containing Dental Restoratives on NiTi Orthodontic Wires

Evaluation of the effect of fluoride‐containing acetic acid on NiTi wires

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