Identificação de patógenos endodônticos por PCR e quantificação de DNA em amostras extraídas de dentes com periodontite apical pós-tratamento

Autores

  • Marcos Sergio Endo Discipline of Endodontics, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP
  • Fernanda Graziela Corrêa Signoretti Discipline of Endodontics, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP
  • Ariane Cássia Salustiano Marinho Discipline of Endodontics, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP
  • Frederico Canato Martinho Discipline of Endodontics, Department of Restorative Dentistry, São José dos Campos Dental School, State University of São Paulo, SP
  • Brenda Paula Figueiredo de Almeida Gomes Discipline of Endodontics, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP

DOI:

https://doi.org/10.11606/issn.2357-8041.clrd.2014.82484

Palavras-chave:

Endodontia, Falha de Tratamento, Periodontite Periapical, Bactérias, Reação em Cadeia da Polimerase, DNA, Clorexidina.

Resumo

Objetivo: O objetivo deste estudo clínico foi quantificar a concentração de DNA e detectar algumas espécies bacterianas de amostras de dentes tratados endodonticamente com periodontite apical após a remoção da guta-percha (S1), após o preparo químico-mecânico na primeira sessão (S2), 5 dias após o preenchimento do canal com solução fisiológica estéril (S3), após reinstrumentação na segunda sessão (S4), e 14 dias após a inserção da medicação intracanal na terceira sessão (S5). Métodos: Quinze dentes tratados endodonticamente foram selecionados. A remoção da guta-percha foi realizada por meio da técnica coroa-ápice. Utilizaram-se limas manuais associadas à clorexidina gel a 2% durante o preparo químico-mecânico. A medicação intracanal selecionada foi à base de hidróxido de cálcio. DNA foi isolado das amostras e foram investigadas 14 espécies bacterianas (primer espécie-específi co16S rDNA). A concentração de DNA foi quantifi cada utilizando o espectrofotômetro NanoDropTM 2000. Resultados: Em todos os casos foram detectadas bactérias, como revelado por meio do primer universal. DNA foi isolado de todas as amostras, com uma concentração média de 4,24 ± 2,9 ng/µL (S1), 3,39 ± 1,54 ng/ µL (S2), 4,0 ± 1,94 ng/µL (S3), 2,66 ± 0,98 ng/µL (S4) e 3,97 ± 2,32 ng/µL (S5). Parvimonas micra e Enterococcus faecalis (S1), P. micra (S2), Porphyromonas endodontalis e E. faecalis (S3), E. faecalis e Prevotella nigrescens (S4/S5) foram as espécies mais frequentemente detectadas. A concentração de DNA diminuiu entre S3 e S4 (p = 0,0256), ao passo que um aumento foi observado entre S4 e S5. Conclusão: Uma ampla variedade de espécies bacterianas foi detectada em canais radiculares de dentes tratados endodonticamente com periodontite apical. Além disso, o uso da medicação intracanal não potencializou a redução da concentração de DNA bacteriano.

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Publicado

2014-12-31

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