ABSTRACT
A estomatite por prótese (EP) é uma condição multifatorial que acomete frequentemente usuários de prótese total e geralmente é relacionada com Candida albicans. Devido aos efeitos tóxicos da terapia antifúngica, novas terapias para EP são necessárias. Objetivos: O objetivo deste estudo foi avaliar a eficácia do extrato aquoso de Buchenavia tomentosa e bicarbonato de sódio frente a C. albicans em um modelo de EP em ratos. Material e Métodos: Um aparelho de resina acrílica simulando a base da prótese total foi fixado cobrindo o palato de 48 ratos machos seguido por indução da candidose. Os ratos foram divididos em 4 grupos (n=12): controle, bicarbonato de sódio, B. tomentosa e nistatina (controle positivo). Cada grupo foi subdividido de acordo com o período de tratamento; 24 horas (n=6) e 48 horas (n=6). Os animais foram sacrificados e os aparelhos foram removidos para contagem de C. albicans e análise por microscopia eletrônica de varredura. Resultados: Após 24 horas de tratamento, observou-se redução significativa da contagem de C. albicans tanto B. tomentosa quanto nistatina (nistatina x controle, p<0,01; B. tomentosa x controle, p=0,03). Os resultados foram confirmados pela análise histológica. Conclusão: Tanto o extrato aquoso de B. tomentosa e o bicarbonato de sódio foram capazes de reduzir significativamente as contagens de C. albicans em modelo experimental de EP (AU)
Background: Denture stomatitis (DS) is a multifactorial condition that commonly affects denture users and is mainly caused by Candida albicans. Due to the toxic effects of antifungal therapy, new therapies for DS are claimed. Objective: The aim of the study was to evaluate the efficacy of aqueous extract of Buchenavia tomentosa and sodium bicarbonate against C. albicans in a model of DS in rats. Material and Methods: An acrylic resin device simulating a denture base was fixed covering the palate of forty-eight male rats followed by candidiasis induction. Rats were divided into 4 groups (n = 12): Control, sodium bicarbonate, B. tomentosa and nystatin (positive control). Each group was subdivided according to the period of treatment; 24 h (n = 6) and 48 h (n = 6). Animals were sacrificed and had their devices removed for C. albicans counts and SEM analysis. The palate mucosa was removed and processed for histopathologic analysis. Results: After 24 h of treatment, both B. tomentosa and nystatin groups reduced significantly C. albicans counts when compared to control (nystatin x control, p < 0.01; B. tomentosa x control, p = 0.03). The results were confirmed by the histologic analysis. Conclusion: Both the aqueous extract of B. tomentosa and sodium bicarbonate was able to significantly decrease C. albicans counts in an experimental model of DS (AU)
Subject(s)
Animals , Rats , Candida albicans , Stomatitis , Drug TherapyABSTRACT
BACKGROUND: The aim of this study was to evaluate the frequency of Candida species and presence of lesions in the oral cavity of patients with sickle cell anemia (SS). METHODS: The study included 30 patients diagnosed with sickle cell anemia and taking hydroxyurea for at least 90 days (SS/HU+); and 39 patients with sickle cell anemia and without hydroxyurea therapy (SS/HU-). Two control groups were constituted by healthy individuals matched to the test groups in age, gender, and oral conditions (C/HU+ for SS/HU+ and C/HU- for SS/HU-). Oral clinical examination and anamnesis were performed. Yeasts were collected by oral rinses and identified by API system. Antifungal susceptibility evaluation was performed according to the CLSI methodology. Data obtained for microorganisms counts were compared by Student's t test (SS/HU+ vs. C/HU+ and SS/HU- vs. C/HU-) using MINITAB for Windows 1.4. Significance level was set at 5%. RESULTS: No oral candidosis lesions were detected. Significant differences in yeasts counts were observed between SS/HU- group and the respective control, but there were no differences between SS/HU+ and C/HU+. Candida albicans was the most prevalent species in all groups. Candida famata was observed both in SS and control groups. Candida dubliniensis, Candida glabrata, Candida krusei, Candida tropicalis, Candida pelliculosa, and Candida parapsilosis were observed only in SS groups. Most strains were susceptible to all antifungal agents. CONCLUSION: Hydroxyurea therapy seems to decrease candidal counts and resistance rate in sickle cell anemia patients. However, further studies should be conducted in the future to confirm this finding. Hydroxyurea therapy in sickle cell anemia patients maintains fungal species balance in oral cavity.
Subject(s)
Anemia, Sickle Cell/drug therapy , Antifungal Agents/therapeutic use , Antisickling Agents/therapeutic use , Candidiasis, Oral/prevention & control , Hydroxyurea/therapeutic use , Adolescent , Adult , Candida/classification , Candida/drug effects , Candida glabrata/drug effects , Candida glabrata/isolation & purification , Candida tropicalis/drug effects , Candida tropicalis/isolation & purification , Case-Control Studies , Colony Count, Microbial , Cross-Sectional Studies , DMF Index , Drug Resistance, Fungal , Female , Fluconazole/pharmacology , Flucytosine/pharmacology , Humans , Ketoconazole/pharmacology , Male , Microbial Sensitivity Tests , Middle Aged , Mouth/microbiology , Saliva/metabolism , Secretory Rate/physiology , Young AdultABSTRACT
Introdução: A descoberta de novos agentes que possam ajudar no controle de lesões bucais causadas por leveduras do gênero Candida vem despertando interesse, visto que reservatórios bucais de micro-organismos oportunistas têm potencial para causar infecções sistêmicas, especialmente em pacientes imunocomprometidos. Objetivo: O objetivodo estudo foi avaliar o efeito antifúngico de uma formulação de bórax, água de rosas e mel, in vitro, sobre cepas clínicas e padrão de C. albicans, e amostras padrão de C. dubliniensis. Material e método: O método utilizado foi de diluição em ágar Müeler-Hinton (Difco®). A formulação completa e seus constituintes isolados foram avaliadosem diferentes concentrações. Resultado: Observou-se que a associação foi inibitória para todas as cepas testadas na concentração de 6,75%. Os resultados mostraram que soluções de bórax isoladamente apresentaram melhor eficácia se comparadas às soluções com outros constituintes ou até mesmo à formulação, com efeito antifúngico a partir da concentração de 0,0625%. O bórax isolado apresentou maior efetividade antifúngica a baixas concentrações. Quando da adição do mel ou água de rosas, observou-se redução da efetividade. Conclusão: Os resultados sugeremque o bórax é o responsável pelo efeito biológico da fórmula e que esta pode ser aplicada como coadjuvante no controle de infecções fúngicas bucais.
Introduction: The interest in new antifungal agents that may help the control of Candida spp. related lesions has been increasing. Oral reservoirs of opportunistic microorganisms have the potential to cause systemic infections, in particular in immunocompromised patients. Objective: This study evaluated the antifungal effect of a boraxbasedformula with water of roses and honey on Candida albicans clinical and standard strains and two Candida dubliniensis standard strains. Method: The method adopted was dilution in Müeler-Hinton agar (Difco®). Thecomplete formula and its constituents were evaluated at different concentrations. Result: The complete formula showed inhibitory effect against all the tested isolates at the concentration of 6.75%. The results showed that borax solutions were more efficient when compared to the other constituents of the formula. Borax solutions showed high antifungal activity even in low concentrations. The addition of the honey and water of roses reduced their effectiveness. Conclusion: The results suggest that borax is the responsible for the biological effect of the formulaand that it can be used as adjuvant in the control of fungal oral infections.
