Relationship between electrochemical corrosion and the tribologic properties of orthodontic alloys

Bentahar, Zakaria; Bellamine, Meryem; Zertoubi, M.; Irhzo, A.; Boussiri, Khalid El

doi:10.1016/j.ortho.2010.09.001

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…However, the untreated group also exhibited small surface irregularities (Figure 1a), which likely resulted from the wire manufacturing process. 18 The immersion of thermally activated NiTi wires in orange juice, soft drinks, or sports drinks does not affect wire topography. 10 However, immersion times used in this previous study were ~95% shorter than immersion times used in our current study.…”

Section: Discussionmentioning

confidence: 99%

Degradation of orthodontic wires under simulated cariogenic and erosive conditions

et al. 2014

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This study examined the effect of cariogenic and erosive challenges (CCs and ECs, respectively) on the degradation of coppernickel-titanium (CuNiTi) orthodontic wires. Sixty wire segments were divided into four treatment groups and exposed to CCs, ECs, artificial saliva, or dry storage (no-treatment control). CC and EC were simulated using a demineralizing solution (pH 4.3) and a citric acid solution (pH 2.3), respectively. Following treatment, the average surface roughness (Ra) of the wires was assessed, and friction between the wires and a passive self-ligating bracket was measured. CuNiTi wires subjected to ECs exhibited significantly higher Ra values than did those that were stored in artificial saliva. In contrast, surface roughness was not affected by CCs. Finally, friction between the treated wires and brackets was not affected by ECs or CCs. Our results indicate that CuNiTi orthodontic wires may suffer degradation within the oral cavity, as ECs increased the surface roughness of these wires. However, rougher surfaces did not increase friction between the wire and the passive selfligating bracket.

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Section: Discussionmentioning

confidence: 99%

Degradation of orthodontic wires under simulated cariogenic and erosive conditions

et al. 2014

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“…The results of the present study showed that all experimental groups displayed non significant differences in force values at those three times intervals and this may attributed to the formation of a stable passive oxide layer (TiO 2 ) Bentahar et al (33) and Al-Joboury (34) , while Wever et al (35) found that the daily released of nickel from NiTi alloy is strongly decreased after the first day of soaking. In addition, this result was attributed to the ability of NiTi alloy to be repassivated.…”

Section: Discussionmentioning

confidence: 51%

Effect of Artificial Salvia on Force Values of Two Types of Nickel Titanium Ortho-dontic Arch Wires

Hamadani¹,

Al-Jwary²

2012

RDENTJ

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Aims:To study the effect of artificial saliva and time interval on the amount of force values of nitinol and superelastic NiTi wires. Materials and Methods: Two types of orthodontic wires chosen for the study nitinol and superelastic NiTi wires of a guage of 0.016 inch in diameter (Dentaurum, Germany). Specimens of the wires were divided in to two groups ;the control group(dry condition) contained the wires as -received condition and experimental groups for the study of the force value of wires which subjected to artificial saliva for three time incubation periods (3 days, 7 days, 28 days) . At end of each incubation periods ,the wire specimens were tested for the effect of artificial saliva on force values of the wire. The measurement of force values of arch wires done with a universal tensile testing machine ,the force values of specimens were evaluated with the help of three point bending test. The results were subjected to the descriptive statistics and to the ANOVA and Duncan's Multiple Range Analysis Tests to detect the amount of changes among these groups . Result: The findings of the present study showed that the control group of nitinol wires had the highest rate of force value with significant difference (P≤ 0.05) with experimental groups, while the experimental group after 28 days gave rise to the lowest one with significant difference (P≤ 0.05) from other groups. For the superelastic nickel titanium the result showed that the control group had the highest rate of force value while the experimental group after 28 days gave rise to the lowest one with significant difference (P≤ 0.05) from control and non significant difference (P> 0.05) with the experimental groups after 3 days and 7 days. Conclusion: The nitinol wires showed a continuous change in force values with increase time in artificial saliva, so this required reactivating or changing the wire at a certain interval of use. While force values of the superelastic nickel titanium wires decreased after 3 days interval and remained constant after that .

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Relationship between electrochemical corrosion and the tribologic properties of orthodontic alloys

Cited by 2 publications

References 10 publications

Degradation of orthodontic wires under simulated cariogenic and erosive conditions

Degradation of orthodontic wires under simulated cariogenic and erosive conditions

Effect of Artificial Salvia on Force Values of Two Types of Nickel Titanium Ortho-dontic Arch Wires

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