Avaliação in vitro de duas resinas macias para reembasamento de próteses modificadas pela incorporação de clorexidina

• Autor(a) principal: Bertolini, Martinna de Mendonça e
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/14192
• topic: Denture soft lining materials; Biofilm; Candida albicans; Chlorhexidine diacetate; Chlorhexidine release; Antifungal activity; Resina macia; Biofilme; Candida albicans; Diacetato de clorexidina; Liberação de clorexidina; Atividade antifúngica; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

Denture soft lining materials are widely used after dental surgeries, tissue conditioning and stabilization of prostheses, until the complete tissue healing. It is important that this material not became easily colonized by oral biofilm and if possible, avoid contamination of the surgical site. The aim of this study was to evaluate the effect of chlorhexidine incorporation into resin-based soft denture lining material, considering the drug release analysis, cytotoxicity and C. albicans biofilm inhibition. Specimens were done using Trusoft® and Coe-soft®, incorporating 0%, 0.5%, 1.0% and 2.0% of chlorhexidine, totaling eight groups. The chlorhexidine release was evaluated through the measurement of change in optical density of the storage solution, which the specimens were immersed, by UV spectrometry, after every 48 hours for 40 days. The cellular cytotoxicity was evaluated in fibroblasts (strain L929), which were 24 hours in contact with culture medium, in which the specimens were previously immersed, the technique of neutral red dye uptake was used after 24, 48 and 72 hours and weekly until 28th day. Finally, the antifungal activity against C. albicans (ATCC 10231) was evaluated by two different ways: (1) agar diffusion test, in which the specimens were placed over the top of BHI agar plates previously inoculated with C. albicans, and the measurement of inhibition zone was done after 48h of incubation at 37ºC, (2) C. albicans biofilm inhibition over the specimens surface, which was mensured after every each 48 hours of biofilm and specimens co-incubation, by methyl tetrazolium (MTT), in UV/vis spectrophotometer, during 22 days. Data were analyzed with the SigmaStat software (version 3.1, USA). Statistical differences were determined by analysis of variance ANOVA and all procedures for multiple paired comparisons were made using the Holm-Sidak method, with overall significance level of 0.05. The chlorhexidine added to both resins, Trusoft® and Coe-soft®, can be released to the storage medium, with a dose-related effect, however the resins presented different release kinetics, since the Trusof released up to 71% of the total amount of the chlorhexidine released within the first 48 hours and Coe-soft release only up to 44%, considering the citotoxic effect, both chlorhexidine incorporated resins showed some extra cytotoxic effect, if compared to resins without chlorhexidine, but for Coe-soft no statistical difference of values was founded, only for Trusoft (p<0.001); considering the C. albicans inhibition, the agar diffusion test values were dose-related for both resins, however with bigger inhibition zones for Trusoft (p<0.001), and without any inhibition for the resins without clorexidine. For the C. albicans biofilm inhibition test, performed only with Coe-soft resin, it was verified a complete inhibition at 8, 12 and 16 days for the incorporation of 0.5%, 1.0% and 2.0% of clorexidine respectively, a statistically significant decrease (p<0.001) if compared to the resin without incorporation of chlorhexidine, which showed no inhibitory effect over the biofilm formation.