DOI: 10.17567/currresdentsci.1672338 ISSN: 2822-2555

Long-Term Durability of Hydrophilic and Hydrophobic Coatings on PMMA Surfaces: The Effect of Denture-Cleansing Tablets - An Experimental Study

Kevser Karakaya, Oğuzhan Evcin
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Objective: To assess how hydrophilic and hydrophobic sol gel coatings affect Polymethyl Methacrylate (PMMA) surface wettability before and after simulated denture cleaner aging.Method: PMMA discs were assigned to hydrophilic, hydrophobic, and uncoated control groups; coatings were applied by a sol-gel process. To simulate the clinical finishing procedure, specimens in the hydrophobic group were polished with standard pumice and acrylic polishing paste. Aging was simulated with an alkaline peroxide denture cleanser for 180 cycles (~6 months). Static water contact angles were measured at baseline and after aging.Results: At baseline, hydrophobic coatings produced the highest contact angles (most hydrophobic), uncoated PMMA was intermediate, and hydrophilic coatings produced the lowest (most wettable).After aging, contact angles decreased significantly for the hydrophobic coating (P<.05), indicating loss of hydrophobicity; increased for the hydrophilic coating (P<.05), indicating reduced wettability; and decreased for the control group (P<.05), consistent with increased hydrophilicity.Conclusion: Routine exposure to denture cleaner can diminish the water-repellent behavior of hydrophobic coatings on PMMA, while hydrophilic coatings remain comparatively stable. Coating-cleaning compatibility should be considered to sustain long-term surface performance.Keywords: Polymethyl Methacrylate, hydrophilic coating, hydrophobic coating, denture cleansing tablet, contact angle measurement.

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