Evaluation of guanidine antifungal solutions for denture base resin: an in vitro study

Maria Eduarda Rodrigues Gama, Vicente Castelo Branco Leitune, Isadora Martini Garcia, Stéfani Becker Rodrigues, Fabrício Mezzomo Collares

Abstract


Background: The purposes of this study were: (1) to formulate polyhexamethylene guanidine hydrochloride (PHMGH) solutions at different concentrations; (2) to evaluate their antifungal activity against a mature biofilm of Candida albicans on acrylic resins; (3) to evaluate possible effects on acrylic resins flexural strength and surface roughness. Methods: PHMGH solutions were formulated with distilled water and 0.125, 0.250, or 0.5 wt.% of PHMGH. One group without PHMGH was used as control. For antifungal activity analysis, acrylic resin specimens were contaminated with C. albicans. Specimens were immersed in PHMGH solutions or distilled water for 5 or 10 min. Ultimate flexural strength and surface roughness of acrylic resins were evaluated. Results: All PHMGH solutions at 5 or 10 min showed antifungal activity compared to the control group (p<0.05). The group with 0.5 wt.% of PHMGH showed no countable colonies regardless of the time of contact with the acrylic resins. After 10 min, all PHMGH solutions had antifungal effect without differences from 0.125 to 0.5 wt.% of PHMGH. All groups showed high flexural strength after contact with the solutions compatible with ISO 20795-1:2013 recommendation. The values of surface roughness always remained low, from 0.01 to 0.04 μm for all groups. Conclusion: Within the limitations of this study, it was concluded that the use of a solution composed by distilled water and 0.5 wt.% of PHMGH for 5 min was effective as a disinfectant agent against mature biofilm of C. albicans , maintaining acceptable roughness and flexural strength.

Keywords


Acrylic resins; Antifungal agents; Candidiasis; Guanidine; Dentures

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References


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DOI: https://doi.org/10.22456/2177-0018.104096

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e-ISSN 2177-0018 / ISSN 0566-1854.

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