Avaliação do desenvolvimento de biofilme e da atividade antibiofilme, pH e solubilidade de cimentos endodônticos
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Data
2012-03-30
Autores
Faria Junior, Norberto Batista [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Objetivo: Este estudo avaliou: (experimento 1) a influência de diferentes substratos na formação de biofilmes de Enterococcus faecalis; e (experimento 2) a atividade antibacteriana contra E. faecalis, pH e solubilidade dos cimentos AH Plus, Sealer 26, Epiphany SE, Sealapex, Activ GP, MTA Fillapex e MTA Sealer. Metodologia: (1) Biofilmes de E. faecalis foram desenvolvidos sobre dentina bovina, guta-percha, hidroxiapatita e osso bovino por 14 ou 21 dias. Após os períodos de incubação, os espécimes (n=5 por substrato por período) foram marcados pela técnica Live/Dead e observados usando microscopia confocal de varredura a laser. Quatro imagens foram obtidas para cada amostra e analisadas pelo programa bioImage_L. Os parâmetros avaliados foram biovolume (μm3) da população total e verde (células vivas) e o percentual de cobertura do substrato. (2) Para o segundo experimento, discos de cada cimento endodôntico foram preparados e armazenados por 2 ou 7 dias. A atividade antibacteriana foi avaliada pelo teste de difusão em ágar (TDA) e pelo teste de contato direto sobre biofilme (TCDB, antibiofilme). No TCDB, biofilmes foram induzidos em blocos de dentina bovina por 14 dias. Os cimentos foram, então, colocados sobre os biofilmes e permaneceram em contato por 5, 10 ou 15 h. No grupo controle, nenhum cimento foi colocado sobre os biofilmes. Os blocos de dentina com o biofilme remanescente foram avaliados quantitativamente (número de unidades formadoras de colônia [UFC]). A solubilidade dos cimentos correspondeu à perda de massa (%) após 15 h de imersão em água destilada. Os valores de pH foram mensurados nos períodos de 5, 10 e 15 h. A análise estatística foi realizada por testes paramétricos e não paramétricos (p=0,05). Resultados: (1) Houve formação de biofilme em todos os grupos. Não houve diferença...
Objective: This study evaluated: (experiment 1) the influence of different substrates on the Enterococcus faecalis biofilm formation; and (experiment 2) the antibacterial activity against E. faecalis, pH and solubility of the sealers AH Plus, Sealer 26, Epiphany SE, Sealapex, Activ GP, MTA Fillapex and MTA Sealer. Methods: (1) E. faecalis biofilms were grown on bovine dentin, gutta-percha, hydroxyapatite and bovine bone for 14 or 21 days. After the incubation periods, the specimens (n=5 per substrate per period) were stained using the Live/Dead technique and observed using a confocal laser scanning microscope. Four confocal pictures were obtained from each sample and analyzed by the software bioImage_L. The parameters evaluated were biovolume (μm3) of total and green population (live cells) and the percentage of surface covered by microorganisms (covering grade). (2) For the second experiment, disks of each material were prepared and stored for 2 or 7 days. Antimicrobial activity was evaluated by the agar diffusion test (ADT) and the direct contact test on biofilm (DCTB, antibiofilm). For the DCTB, biofilms were grown on bovine dentin blocks for 14 days. Then, the sealers were placed on the biofilms and remained in contact for 5, 10 or 15 h. In the control group, no sealer was placed on the biofilms. The dentin blocks containing the remaining biofilms were assessed quantitatively (number of colonyforming units [CFU]). The solubility of the sealers corresponded to their mass loss (%) after 15 h immersion in distilled water. The pH values were measured at 5, 10 and 15 h. Statistical analysis was performed using parametric and non-parametric tests (p=0.05). Results: (1) There was biofilm formation in all groups. Considering the values of the covering grade there was not significant difference among the... (Complete abstract click electronic access below)
Objective: This study evaluated: (experiment 1) the influence of different substrates on the Enterococcus faecalis biofilm formation; and (experiment 2) the antibacterial activity against E. faecalis, pH and solubility of the sealers AH Plus, Sealer 26, Epiphany SE, Sealapex, Activ GP, MTA Fillapex and MTA Sealer. Methods: (1) E. faecalis biofilms were grown on bovine dentin, gutta-percha, hydroxyapatite and bovine bone for 14 or 21 days. After the incubation periods, the specimens (n=5 per substrate per period) were stained using the Live/Dead technique and observed using a confocal laser scanning microscope. Four confocal pictures were obtained from each sample and analyzed by the software bioImage_L. The parameters evaluated were biovolume (μm3) of total and green population (live cells) and the percentage of surface covered by microorganisms (covering grade). (2) For the second experiment, disks of each material were prepared and stored for 2 or 7 days. Antimicrobial activity was evaluated by the agar diffusion test (ADT) and the direct contact test on biofilm (DCTB, antibiofilm). For the DCTB, biofilms were grown on bovine dentin blocks for 14 days. Then, the sealers were placed on the biofilms and remained in contact for 5, 10 or 15 h. In the control group, no sealer was placed on the biofilms. The dentin blocks containing the remaining biofilms were assessed quantitatively (number of colonyforming units [CFU]). The solubility of the sealers corresponded to their mass loss (%) after 15 h immersion in distilled water. The pH values were measured at 5, 10 and 15 h. Statistical analysis was performed using parametric and non-parametric tests (p=0.05). Results: (1) There was biofilm formation in all groups. Considering the values of the covering grade there was not significant difference among the... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Solubilidade, Microscopia confocal, Biofilme, Enterococcus
Como citar
FARIA JUNIOR, Norberto Batista. Avaliação do desenvolvimento de biofilme e da atividade antibiofilme, pH e solubilidade de cimentos endodônticos. 2012. 101 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Odontologia de Araraquara, 2012.