Effects of Fluoride and Dissolved Oxygen Concentrations on the Corrosion Behavior of Pure Titanium and Titanium Alloys.

Nakagawa, Masaharu; Matsuya, Shigeki; Udoh, K.

doi:10.4012/dmj.21.83

Cited by 145 publications

(131 citation statements)

References 8 publications

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“…In fluoride solutions, however, the breakdown of the oxide film has been reported in several articles. [1][2][3][4][5][6][7][8][9][10][11][12][13] According to these results, the corrosion resistance of titanium is reduced markedly in acid fluoride solutions, whereas it remains unchanged in neutral fluoride solutions. Fluorides such as NaF, Na 2 PO 3 F, and SnF 2 are added in toothpaste, prophylactic agents, and dental rinse, and exert a cariostatic effect.…”

Section: Introductionmentioning

confidence: 60%

“…Previously, the effects of fluoride solutions on the fracture of titanium and its alloys have been investigated from the viewpoint of corrosion or discoloration. [1][2][3][4][5][6][7][8][9][10][11][12][13] The corrosion behavior of titanium depends on an oxide film on its surface composed of mainly TiO 2 , which spontaneously covers the surface in the presence of oxygen. In acid fluoride solutions, the oxide film undergoes a reaction, forming titanium fluoride, titanium oxide fluoride, or sodium titanium fluoride, 7,12 and the loss of the oxide film leads to the reduction of the corrosion resistance of titanium in fluoride solutions.…”

Section: Discussionmentioning

confidence: 99%

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Fracture associated with hydrogen absorption of sustained tensile‐loaded titanium in acid and neutral fluoride solutions

Yokoyama

Kaneko

Miyamoto

et al. 2003

J Biomedical Materials Res

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Abstract:The fracture of commercial pure titanium in acid and neutral fluoride solutions has been examined by a sustained tensile-loading test and hydrogen thermal desorption analysis. It was found that the fracture of titanium occurred in neutral 2.0% NaF solution as well as in 2.0% acidulated phosphate fluoride (APF) solution. The time to fracture decreased with increasing applied stress in both 2.0% APF and 2.0% NaF solutions. In the case of the same applied stress, the time to fracture in the 2.0% APF solution was shorter than that in the 2.0% NaF solution. General corrosion was exhibited on the side surface of the tested specimens. The formation of sodium titanium fluoride was observed on the surface of the immersed specimens in the 2.0% APF solution. Hydrogen desorption of the tested specimen in the 2.0% APF solution was observed with a peak at approximately 600°C. The amount of absorbed hydrogen was Ͼ300 mass ppm in the 2.0% APF solution under an applied stress for 24 h. The results of the present study imply that applying stress to titanium by immersing in fluoride solutions leads to the degradation of its mechanical properties.

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Section: Introductionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Fracture associated with hydrogen absorption of sustained tensile‐loaded titanium in acid and neutral fluoride solutions

Yokoyama

Kaneko

Miyamoto

et al. 2003

J Biomedical Materials Res

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show abstract

“…Some reports show that fluoride may induce corrosion of alloys. Nakagawa et al 29) reported that pure titanium and titanium alloys were corroded by fluoride at half or less than half of the concentration currently found in commercial dentifrices less than 453 ppm fluoride. Watanabe et al 30) reported that several applications of acidulated fluoride agents may cause discoloration of β-titanium alloy wires.…”

Section: Discussionmentioning

confidence: 99%

Fluoride release and recharge characteristics of denture base resins containing surface pre-reacted glass-ionomer filler

et al. 2009

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The flexural strength, flexural modulus, and the amount of fluoride released from four experimental denture base resins containing 5, 10, 20 and 30 wt% surface pre-reacted glass-ionomer (S-PRG) filler added to the powder were evaluated. The mean flexural strength of the experimental resins, except the 30 wt%, and the flexural modulus of all the resins, complied with ISO 1567 requirements. In the 20 wt% resin, the amount of fluoride released in the initial phase was 1.88 μg/cm 2 /day, after which the level decreased. After recharging in a 9,000 ppm fluoride solution for eight hours, the level of released fluoride increased markedly to 40.21 μg/cm 2 /16hrs. Our results show that fluoride levels increased as a function of the S-PRG filler content. After the almost completely discharged resins were recharged, similar fluoride release occurred again. These results suggest that denture base resins containing S-PRG filler have great recharge and release capabilities which may assist in preventing root caries of abutment teeth.

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“…The fluoride ions degrade the protective TiO 2 film formed on Ti and Ti alloys. [4][5][6][7][8] Since the outermost surface of NiTi archwire contains mainly TiO 2 film with small amounts of NiO, 9 fluorideenhanced corrosion of the NiTi archwire may occur. The corrosion behavior of a NiTi archwire in fluoride-containing mouthwashes (fluoride ion: a few hundred parts per million) 10,11 or prophylactic gels (fluoride ion: close to or more than 10,000 ppm) 12 has been investigated.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of Different Nickel-Titanium Archwires in Acidic Fluoride-containing Artificial Saliva

Lee¹,

Huang²,

Lin³

et al. 2010

The Angle Orthodontist

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Objective: To test the hypothesis that different nickel-titanium (NiTi) archwires may have dissimilar corrosion resistance in a fluoride-containing oral environment. Materials and Methods: Linear polarization test, a fast electrochemical technique, was used to evaluate the corrosion resistance, in terms of polarization resistance (R p ), of four different commercial NiTi archwires in artificial saliva (pH 6.5) with various NaF concentrations (0%, 0.01%, 0.1%, 0.25%, and 0.5%). Two-way analysis of variance was used to analyze R p with the factors of archwire manufacturer and NaF concentration. Surface characterizations of archwires were analyzed using scanning electron microscopy, atomic force microscopy, and x-ray photoelectron spectroscopy. Results: Both archwire manufacturer and NaF concentration had a significant influence on R p of NiTi archwires. Different surface topography was present on the test NiTi archwires that contained the similar surface chemical structure (TiO 2 and trace NiO). The surface topography did not correspond to the difference in corrosion resistance of the NiTi archwires. Increasing the NaF concentration in artificial saliva resulted in a decrease in R p , or corrosion resistance, of all test NiTi archwires. The NiTi archwires severely corroded and showed similar corrosion resistance in 0.5% NaF-containing environment. Conclusions: Different NiTi archwires had dissimilar corrosion resistance in acidic fluoridecontaining artificial saliva, which did not correspond to the variation in the surface topography of the archwires. The presence of fluoride in artificial saliva was detrimental to the corrosion resistance of the test NiTi archwires, especially at a 0

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Effects of Fluoride and Dissolved Oxygen Concentrations on the Corrosion Behavior of Pure Titanium and Titanium Alloys.

Cited by 145 publications

References 8 publications

Fracture associated with hydrogen absorption of sustained tensile‐loaded titanium in acid and neutral fluoride solutions

Fracture associated with hydrogen absorption of sustained tensile‐loaded titanium in acid and neutral fluoride solutions

Fluoride release and recharge characteristics of denture base resins containing surface pre-reacted glass-ionomer filler

Corrosion Resistance of Different Nickel-Titanium Archwires in Acidic Fluoride-containing Artificial Saliva

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