RESUMO
STATEMENT OF PROBLEM: Whether the disinfection of polymethyl methacrylate (PMMA) dentures eliminates Candida albicans biofilm is unclear. PURPOSE: The purpose of this in vitro study was to determine the antimicrobial effect of immersion in hydrogen peroxide (H2O2) and subsequent application of microwaves on the formation of C albicans biofilm on the surface of polished and unpolished PMMA disks. MATERIAL AND METHODS: Polished and unpolished PMMA disks (n=40) were mounted in a Center for Disease Control (CDC) biofilm reactor by adding yeast-dextrose-peptone (YPD) broth inoculated with C albicans in a cell suspension for 24 hours. After this period, the PMMA disks (n=8) were disinfected with 5 different solutions: saline solution, 1% sodium hypochlorite (NaOCl), H2O2, H2O2 microwaved at 650 W for 3 minutes (H2O2/µw), and distilled water microwaved at 650 W for 3 minutes (H2O/µw). On the polished and unpolished surface of each disk, arbitrary fluorescence units (AFU) were quantified with the live/dead bacterial viability kit (Invitrogen) by using confocal laser scanning microscopy (CLSM) to evaluate 10 different areas of each surface; these were counted as the colony-forming units (CFUs). The mean values were compared by using the Mann-Whitney U test (α=.05). RESULTS: Polished surfaces disinfected with H2O2/µw obtained the lowest viable cells (9.76 AFU) and nonviable cells (12.46 AFU) compared with H2O/µw and H2O2. In the unpolished surface the lowest mean values of viable cells (14.64 AFU) and nonviable cells (12.46 AFU) were obtained for the PMMA disks disinfected with H2O/µw compared with H2O2/µw and H2O2. Both polished and unpolished disks showed significant difference (P<.05) compared with the group of PMMA disks immersed in saline solution. No CFUs were detected in the polished or unpolished PMMA disks immersed in H2O2/µw or in NaOCl. CONCLUSIONS: H2O2 alone did not eliminate the formation of the biofilm of C albicans; however, in combination with the use of the microwave at 650 W for 3 minutes, the biofilm formation of C albicans on polished surfaces was reduced. The number of AFUs of viable-nonviable cells and CFUs depended on whether the surfaces are polished or unpolished.
Assuntos
Candida albicans , Polimetil Metacrilato , Polimetil Metacrilato/farmacologia , Peróxido de Hidrogênio/farmacologia , Desinfecção , Micro-Ondas/uso terapêutico , Solução Salina/farmacologia , Biofilmes , Dentaduras/microbiologiaRESUMO
La hiperplasia epitelial multifocal es una enfermedad benigna que se caracteriza por la presencia de múltiples pápulas en la mucosa de la cavidad bucal, asociada con el virus del papiloma humano 13 y 32. En el presente trabajo se describen tres casos con características clínicas similares, donde se evidencian múltiples pápulas no dolorosas localizadas en mucosa bucal y lengua, mostrando un curso lento y benigno las cuales no habían sido diagnosticadas previamente por dentistas de práctica general. Se llevó a cabo el diagnóstico basado en las características clínicas patognomónicas de las lesiones, historia familiar y evolución; se les dio información a los pacientes acerca de su padecimiento y se mantienen periódicamente en observación. El objetivo de este trabajo es mostrar las características clínicas de la hiperplasia epitelial multifocal y hacer una revisión de la literatura en cuanto a la etiología de las lesiones su evolución, diagnóstico diferencial y tratamiento.
Multifocal epithelial hyperplasia is a benign disease characterized by the presence of multiple papules in oral cavity mucosa. It is as-sociated with HPV 13 and 32. In this paper, we describe three cases with similar clinical features, involving the presence of multiple painless papules localized in the oral mucosa and on the tongue, and displaying a slow and benign course. The condition had not been previously diagnosed by general dental practitioners. We made our diagnosis based on the pathognomonic clinical features of the lesions, family history, and evolution of the condition. The patients concerned were provided with information about their disease and kept under regular observation. The aim of this article is to describe the clinical features of multifocal epithelial hyperplasia and present a review of the literature on the etiology of the lesions, their evolution, differential diagnosis, and treatment.