Corrosion resistance of straight and C-clasp stainless steel wrought wires in artificial saliva
DOI:
https://doi.org/10.2340/biid.v13.46369Keywords:
stainless steel, corrosion, saliva pH, wire bending, removable partial dentureAbstract
Background: Stainless steel wires are commonly used in removable partial dentures, but their corrosion resistance may be affected by intraoral pH changes and mechanical deformation, such as bending into C-clasps.
Objective: To evaluate the corrosion resistance of straight and C-clasp stainless steel wires in artificial saliva (pH 5.5 and 7.0) and to assess the influence of bending on corrosion behavior.
Materials and methods: An in vitro experimental study was conducted using four groups of stainless steel wires: straight pH 5.5, C-clasp pH 5.5, straight pH 7.0, and C-clasp pH 7.0. The samples were immersed for 4 weeks, with weekly weight measurements and corrosion rate calculations performed. Data were analyzed using repeated measures analysis of variance (ANOVA) or the Friedman test and two-way ANOVA for intergroup comparisons.
Results: Two-way ANOVA revealed a significant effect of pH on corrosion behavior (p < 0.001), whereas wire configuration had no significant effect (p > 0.05). Acidic conditions (pH 5.5) resulted in significantly greater weight loss in both straight and C-clasp wires than neutral conditions, indicating increased corrosion in acidic environments. At pH 7.0, the corrosion rates were minimal or slightly negative, suggesting limited corrosion or minor weight changes.
Conclusion: Environmental pH plays a central role in corrosion behavior, with acidic conditions accelerating degradation. No significant effect of bending into a C-clasp on corrosion susceptibility was observed under the present conditions. Maintaining an optimal oral pH may help preserve the integrity of stainless steel components in removable partial dentures.
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