Influence of pH on the Corrosion Behaviour of Laser-Processed Co-Cr Dental Alloys in Artificial Saliva

Dan, Mircea Laurențiu; Costea, L. V.; Savencu, Cristina; Porojan, Liliana

doi:10.1088/1757-899x/416/1/012036

Cited by 2 publications

(1 citation statement)

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“…Besides, when exposed to pH changes in saliva, they become subject to corrosion, with higher corrosion/ion release rates when exposed to acidic pHs [23]. The resistance to corrosion decreases as the pH decreases, and in the most acidic saliva, corrosion rates are higher due to the higher nickel dissolution rate [24], causing a greater manifestation of its allergenic properties.…”

Section: Introductionmentioning

confidence: 99%

Comparative assessment of TiN thin films created by plasma deposition technique on the surface features of NiCr alloys for dental applications

et al. 2023

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Introduction: Surface treatment is an important technique to increase adhesion between implants and bones, improving its mechanical characteristics and consequently the patient's comfort. Objectives: Ni-Cr alloys were the object of study in this work, with the purpose of analyzing and evaluating the effect of thin films deposition of titanium nitride via plasma, on its surface and comparing with cathodic cage (CC) and hollow cathode (HC) methods, for dental applications. Methods: Eighteen samples were prepared and the experiment was conducted in two steps: the pre-sputtering (1h, 350 °C, gases: Ar and H) and sputtering (4h, 450 °C, gases: Ar, Ni, and H). To characterize and compare the samples with those of reference, the Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Vickers Microhardness and wettability tests were used. Results: The results presented by SEM showed that during the surface treatment using CC, voids were formed, and using HC, the samples showed a more homogenous behavior. In microhardness tests, using a 25gf load, it was possible to observe that the HC method allowed an increase of 87% when compared to the reference and treated samples. Significance: Lastly, it can be concluded that both methods are suitable for Ni-Cr alloy surface treatment, and the HC technique, a method already used by dental professionals, presents better results due to the formation of a thicker film layer.

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Section: Introductionmentioning

confidence: 99%