Eficácia da terapia fotodinâmica e do hipoclorito de sódio sobre o sistema de canais radiculares infectado com Enterococcus faecalis – um estudo in vitro

Autores

  • Matheus Albino Souza Universidade de Passo Fundo
  • Liviu Steier Warwick Medical School
  • Giampiero Rossi-Fedele University of Adelaide
  • Valdir Barth Júnior Pontifícia Universidade Católica do Rio Grande do Sul
  • Silvia Dias de Oliveira Pontifícia Universidade Católica do Rio Grande do Sul
  • José Antonio Poli de Figueiredo Pontifícia Universidade Católica do Rio Grande do Sul

DOI:

https://doi.org/10.15448/1980-6523.2016.3.21746

Palavras-chave:

Enterococcus faecalis, Hipoclorito de sódio, Terapia fotodinâmica

Resumo

Objetivo: o propósito deste estudo foi avaliar, in vitro, a eficácia da terapia fotodinâmica e do hipoclorito de sódio sobre o sistema de canais radiculares infectados com Enterococcus faecalis.
Metodologia: Os canais radiculares de 45 dentes humanos extraídos unirradiculares foram ampliados até a lima 60, autoclavados, inoculados com Enterococcus faecalis e incubados por 30 dias. As amostras foram divididas em cinco grupos (G1 – n=5; G2-G5 – n=10) de acordo com o protocolo de descontaminação: G1 (controle negativo) – não foi realizado procedimento; G2 – água destilada; G3 – terapia fotodinâmica; G4 – hipoclorito de sódio 2,5%; G5 – hipoclorito de sódio 2,5%+terapia fotodinâmica. Microscopia eletrônica de varredura foi realizada para avaliar a eficácia dos tratamentos propostos. A avaliação foi feita através de imagens de cada terço a 5000x de magnificação nas paredes do canal e 10000x na profundidade dos túbulos dentinários. A presença de bacterias foi determinada por intermédio de rank de posições a partir de 1 até 45, onde quanto maior o valor, maior a limpeza da amostra. Os dados foram submetidos a one-way ANOVA seguido por post-hoc de Tukey (α=0.05).
Resultados: Grupo 4 (NaOCl 2,5%) e 5 (NaOCl 2,5%+PDT) obtiveram a maior media de posição de ranks para todos os terços do canal radicular na parede do canal, o que foi estatisticamente diferente dos grupos 1, 2 e 3 (p<0.05). Grupo 3 (PDT), grupo 4 (NaOCl 2,5%) e 5 (NaOCl 2,5%+PDT) obtiveram a maior méida de posição de ranks para todos os terços do canal radicular na profundidade dos túbulos dentinários, o que foi estatisticamente diferente dos grupos 1 e 2 (p<0,05).
Conclusão: A associação de hipoclorito de sódio 2,5% e terapia fotodinâmica pode ser considerado um protocolo efetivo na eliminação de Enterococcus faecalis.

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Publicado

2016-12-31

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Artigo Original