Avaliação físico-química e da atividade antibacteriana de soluções irrigadoras endodônticas e associações
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Data
2010-03-25
Autores
Morgental, Renata Dornelles [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Este estudo objetivou avaliar o pH, o teor de cloro disponível e a atividade antibacteriana de soluções irrigadoras endodônticas isoladas e associadas frente ao Enterococcus faecalis pelo teste de contato direto (in vitro) e em canais radiculares contaminados (ex vivo). A análise de pH foi realizada por meio de pHmetro digital e o teor de cloro pelo método da iodometria. Na metodologia de contato direto, uma suspensão de E. faecalis foi exposta aos seguintes irrigantes: GI- Solução de hipoclorito de sódio (NaOCl) a 2,5%; GII- NaOCl a 2,5% + ácido cítrico a 10% 7:3 (em volume); GIII- NaOCl a 2,5% + vinagre de maça 5:5 (em volume); GIV- Ácido cítrico a 10%; GV- Vinagre de maça. Os períodos de contato foram 30 segundos, 1, 3 e 10 minutos. O número de unidades formadoras de colônia por mililitro de solução (UFC/mL) foi determinado após diluições decimais seriadas e semeadura em placas de Tryptic Soy Agar (TSa). Como controle negativo foi utilizado solução fisiológica esterilizada. Em outro experimento, 110 dentes humanos unirradiculados tiveram seus canais radiculares contaminados com E. faecalis e incubados a 37°C por 21 dias. As substâncias analisadas foram: GI- NaOCl a 2,5%; GII- NaOCl a 2,5% + ácido cítrico a 10% 7:3 (em volume); GIII- NaOCl a 2,5% + vinagre de maça 5:5 (em volume); GIV- Vinagre de maçã; GV- Solução de clorexidina a 2%; GVIÁcido peracético a 1%; GVII- Solução salina fisiológica. Coletas microbiológicas foram realizadas imediatamente após preparo biomecânico e decorrido o período de sete dias. Após diluições decimais seriadas, alíquotas foram semeadas em placas de TSa e a contagem de UFC/mL determinada. Os resultados foram submetidos aos testes ANOVA, Tukey e Bonferroni, com nível de significância de 0,05. A associação do NaOCl a 2,5% com ácido cítrico ou vinagre de maça promoveu redução de pH e teor de... (Resumo completo, clicar acesso
This study aimed to evaluate the pH, the available chlorine content and the antibacterial activity of endodontic irrigants and associations against Enterococcus faecalis by direct exposure test (in vitro) and within infected root canals (ex vivo). The pH was recorded using a digital pH meter and the chlorine content was measured by a standard iodine/thiosulfate titration method. In the direct exposure test, a bacterial suspension was mixed with the following irrigants: GI- 2,5% sodium hypochlorite solution (NaOCl); GII- 2,5% NaOCl + 10% citric acid 7:3 (at volume); GIII- 2,5% NaOCl + apple vinegar 5:5 (at volume); GIV- 10% citric acid; GV- apple vinegar. The contact times were 30 seconds, 1, 3 and 10 minutes. The number of colony-forming units per millilitre (UFC/mL) was calculated after serial 10-fold dilutions and culture in Tryptic Soy Agar (TSa) plates. Sterilized physiologic solution was used as negative control. In another experiment, the root canals of 110 human single-rooted teeth were infected with E. faecalis and incubated at 37°C for 21 days. The analysed substances were: GI- 2,5% NaOCl; GII- 2,5% NaOCl + 10% citric acid 7:3 (at volume); GIII- 2,5% NaOCl + apple vinegar 5:5 (at volume); GIV- apple vinegar; GV- 2% chlorhexidine solution; GVI- 1% peracetic acid; GVIIphysiologic saline solution. Microbiological samples were collected immediately after the biomechanical preparation and after 7 days. After serial 10-fold dilutions and culture in TSa plates, UFC/mL counts were determined. The results were submitted to ANOVA, Tukey and Bonferroni test, with a level of significance established at 0.05. The pH and the chlorine content reduced at associations of 2,5% NaOCl with citric acid or apple vinegar. In the direct exposure test, pure and associated NaOCl were capable of killing E. faecalis after 30 seconds. Citric acid did the same... (Complete abstract, click electronic access below)
This study aimed to evaluate the pH, the available chlorine content and the antibacterial activity of endodontic irrigants and associations against Enterococcus faecalis by direct exposure test (in vitro) and within infected root canals (ex vivo). The pH was recorded using a digital pH meter and the chlorine content was measured by a standard iodine/thiosulfate titration method. In the direct exposure test, a bacterial suspension was mixed with the following irrigants: GI- 2,5% sodium hypochlorite solution (NaOCl); GII- 2,5% NaOCl + 10% citric acid 7:3 (at volume); GIII- 2,5% NaOCl + apple vinegar 5:5 (at volume); GIV- 10% citric acid; GV- apple vinegar. The contact times were 30 seconds, 1, 3 and 10 minutes. The number of colony-forming units per millilitre (UFC/mL) was calculated after serial 10-fold dilutions and culture in Tryptic Soy Agar (TSa) plates. Sterilized physiologic solution was used as negative control. In another experiment, the root canals of 110 human single-rooted teeth were infected with E. faecalis and incubated at 37°C for 21 days. The analysed substances were: GI- 2,5% NaOCl; GII- 2,5% NaOCl + 10% citric acid 7:3 (at volume); GIII- 2,5% NaOCl + apple vinegar 5:5 (at volume); GIV- apple vinegar; GV- 2% chlorhexidine solution; GVI- 1% peracetic acid; GVIIphysiologic saline solution. Microbiological samples were collected immediately after the biomechanical preparation and after 7 days. After serial 10-fold dilutions and culture in TSa plates, UFC/mL counts were determined. The results were submitted to ANOVA, Tukey and Bonferroni test, with a level of significance established at 0.05. The pH and the chlorine content reduced at associations of 2,5% NaOCl with citric acid or apple vinegar. In the direct exposure test, pure and associated NaOCl were capable of killing E. faecalis after 30 seconds. Citric acid did the same... (Complete abstract, click electronic access below)
Descrição
Palavras-chave
Endodontia, Canal radicular - Irrigantes, Endodontics, Enterococcus faecalis, Root canal irrigants
Como citar
MORGENTAL, Renata Dornelles. Avaliação físico-química e da atividade antibacteriana de soluções irrigadoras endodônticas e associações. 2010. 77 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Odontologia de Araraquara, 2010.