Biologia molecular - técnica PCR: monitoração do efeito de curativos de demora à base de hidróxido de cálcio na microbiota de canais radiculares em dentes de humanos portadores de lesão periapical crônica
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Data
2003-02-24
Autores
Jacobovitz, Marcos [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
No presente estudo foi monitorada a microbiota do canal radicular de 30 dentes de humanos portadores de lesão periapical crônica. Foram utilizados curativos de demora à base de hidróxido de cálcio entre sessões: Calen (Grupo I), Calen PMCC (Grupo II) e Calasept (Grupo III), que foram mantidos nos canais radiculares por aproximadamente 30 dias. O material colhido dos canais radiculares, antes e após a realização da terapêutica endodôntica, foi submetido a teste laboratorial baseado na biologia molecular: Reação em Cadeia da Polimerase (PCR). Como controle positivo da presença bacteriana, foi utilizado primer 16S rDNA. As seguintes espécies bacterianas foram monitoradas: Porphyromonas endodontalis, Porphyromonas gingivalis, Prevotella intermedia, Prevotella nigrescens (bacilos pigmentados de negro), e Bacteroides forsythus, microrganismos marcantes na patologia de processos infecciosos dos tecidos pulpoperiapicais. Os resultados evidenciaram diminuição das espécies microbianas, aqui monitoradas de forma indireta à partir da presença de bandas, ou amplicons (produtos do PCR), quando do uso de curativos de demora à base de hidróxido de cálcio. Com relação à eficácia particular a cada material, os Grupos I, II e III não demonstraram entre si diferenças estatisticamente significantes.
In the present study the root canal flora of 30 human teeth with chronic periapical lesion was monitored. Dressing pastes based on calcium hydroxide were used, among sessions namely: Calen (Group I), Calen/PMCC (Group II) and Calasept (Group III) that were used as a temporary dressings in root canals for approximately 30 days. The microbial material was colected from root canals, before and after the root canal treatment and submitted to laboratorial test based on molecular biology assay: Polymerase Chain Reaction (PCR). As a positive control of bacterial presence, a primer 16S rDNA was utilized. The following bacterial strains were monitored: Porphyromonas endodontalis, P. gingivalis, P. intermedia, P. nigrescens (black pigmented rods) and B. forsythus, a microorganism with an important role on pulpoperiapical pathosis. The results showed a decrease of bacterial strains population indirectly, based on bands presence (amplicons) where the calcium hydroxide dressing pastes were applied. Concerning the intrinsic efficacy of each material, the Groups I, II and III didn't show significant statistical differences among them.
In the present study the root canal flora of 30 human teeth with chronic periapical lesion was monitored. Dressing pastes based on calcium hydroxide were used, among sessions namely: Calen (Group I), Calen/PMCC (Group II) and Calasept (Group III) that were used as a temporary dressings in root canals for approximately 30 days. The microbial material was colected from root canals, before and after the root canal treatment and submitted to laboratorial test based on molecular biology assay: Polymerase Chain Reaction (PCR). As a positive control of bacterial presence, a primer 16S rDNA was utilized. The following bacterial strains were monitored: Porphyromonas endodontalis, P. gingivalis, P. intermedia, P. nigrescens (black pigmented rods) and B. forsythus, a microorganism with an important role on pulpoperiapical pathosis. The results showed a decrease of bacterial strains population indirectly, based on bands presence (amplicons) where the calcium hydroxide dressing pastes were applied. Concerning the intrinsic efficacy of each material, the Groups I, II and III didn't show significant statistical differences among them.
Descrição
Palavras-chave
Biologia molecular, Reação em cadeia de polimerase, Hidroxido de calcio, Periodontite periapical, Molecular biology, Polymerase chain reaction, Calcium hydroxide, Periapical periodontitis
Como citar
JACOBOVITZ, Marcos. Biologia molecular - técnica PCR: monitoração do efeito de curativos de demora à base de hidróxido de cálcio na microbiota de canais radiculares em dentes de humanos portadores de lesão periapical crônica. 2003. 148 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Odontologia de Araraquara, 2003.