Avaliação in vitro da ação de substâncias químicas auxiliares e medicações intracanais sobre Escherichia coli e sua endotoxina em canais radiculares
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Data
2007-07-31
Autores
Maekawa, Lilian Eiko [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
A proposta deste trabalho foi avaliar a efetividade de substâncias químicas auxiliares e medicações intracanais sobre Escherichia coli e sua endotoxina em canais radiculares. Foram utilizados 120 dentes unirradiculados que após secção das coroas as raízes foram impermeabilizadas e esterilizadas. Os canais foram contaminados com suspensão de Escherichia coli por 14 dias. Após a coleta de confirmação, foram instrumentados até a lima K 50 e escalonados até a K 80. Doze raízes foram utilizadas como controle (G4) e 108 raízes foram divididas em 3 grupos (n=36), de acordo com a substância química auxiliar utilizada: G1) hipoclorito de sódio 2,5%; G2) clorexidina gel 2% (CLX); G3) solução fisiológica apirogênica. Após o preparo biomecânico (PBM) estes grupos foram subdividos de acordo com a medicação intracanal utilizada (MIC) (n=12): A) hidróxido de cálcio (Ca(OH)2), B) polimixina B e C) Ca(OH)2 + CLX. No grupo G4 foi utilizada solução fisiológica apirogênica sem MIC. Foram realizadas coletas do conteúdo do canal radicular imediatamente após o PBM (1ª coleta), após 7 dias do PBM (2ª coleta), imediatamente após 14 dias da ação da MIC (3ª coleta) e 7 dias após remoção da MIC (4ª coleta). Para todas as coletas foram avaliadas: a) atividade antimicrobiana; b) quantificação de endotoxina pelo teste cromogênico do lisado de amebócitos de Limulus. As substâncias químicas auxiliares e as MICs utilizadas foram capazes de eliminar completamente E. coli dos canais radiculares. Para os resultados da quantidade de endotoxina foi aplicado teste estatístico Kruskall-Wallis e Dunn (5%). Na primeira e na segunda coleta verificou-se que os grupos G1 e G2 foram diferentes estatisticamente do grupo G3 (p<0,05). Na terceira coleta, o grupo G2B foi semelhante aos grupos G1A, G1B e G3A e o grupo G3B foi semelhante aos demais (p>0,05).
The purpose of this study was to evaluate the effectiveness of auxiliary chemical substances and intracanal medications on Escherichia coli (E. coli) and its endotoxin in root canals. The study was conducted on 120 single-rooted teeth. After sectioning of crowns, the root canals were contaminated with a suspension of E. coli for 14 days. After collection of confirmation, they were submitted to instrumentation up to K 50 file and step-back preparation up to K 80 file. Thereafter, twelve roots were used as control group (G4) and 108 roots were divided into 3 groups (n=36) according to the auxiliary chemical substance used: G1) 2.5% sodium hypochlorite; G2) 2% chlorhexidine gel (CLX); G3) apyrogenic saline solution. After biomechanical preparation (BMP), these groups were subdivided according to the intracanal medication (ICM) employed (n=12): A) calcium hydroxide (Ca(OH)2), B) polymyxin B, and C) Ca(OH)2 + 2% CLX gel. The control group (G4) was used apyrogenic saline solution without application of intracanal medication. Samples of the root canal content were collected immediately after PBM (1st collection), at 7 days after PBM (2nd collection), immediately after 14 days of ICM activity (3rd collection), and 7 days after removal of ICM (4th collection). The following aspects were evaluated for all collections: a) antimicrobial activity; b) quantification of endotoxin by the Limulus amebocyte lysate test. The auxiliary chemical substances and ICMs employed were able to completely eliminate E. coli from root canals. Results of the amount of endotoxin were analyzed by the Kruskal-Wallis and Dunn (5%) statistical tests. In the first and second collection, it was verified that groups G1 and G2 were statistically different from group G3 (p<0.05). In the third collection, groups G1C, G2A, G2C and G3C showed the lowest endotoxin values and were statistically similar to groups G1A, G1B, G3A and G3B (p>0.05).
The purpose of this study was to evaluate the effectiveness of auxiliary chemical substances and intracanal medications on Escherichia coli (E. coli) and its endotoxin in root canals. The study was conducted on 120 single-rooted teeth. After sectioning of crowns, the root canals were contaminated with a suspension of E. coli for 14 days. After collection of confirmation, they were submitted to instrumentation up to K 50 file and step-back preparation up to K 80 file. Thereafter, twelve roots were used as control group (G4) and 108 roots were divided into 3 groups (n=36) according to the auxiliary chemical substance used: G1) 2.5% sodium hypochlorite; G2) 2% chlorhexidine gel (CLX); G3) apyrogenic saline solution. After biomechanical preparation (BMP), these groups were subdivided according to the intracanal medication (ICM) employed (n=12): A) calcium hydroxide (Ca(OH)2), B) polymyxin B, and C) Ca(OH)2 + 2% CLX gel. The control group (G4) was used apyrogenic saline solution without application of intracanal medication. Samples of the root canal content were collected immediately after PBM (1st collection), at 7 days after PBM (2nd collection), immediately after 14 days of ICM activity (3rd collection), and 7 days after removal of ICM (4th collection). The following aspects were evaluated for all collections: a) antimicrobial activity; b) quantification of endotoxin by the Limulus amebocyte lysate test. The auxiliary chemical substances and ICMs employed were able to completely eliminate E. coli from root canals. Results of the amount of endotoxin were analyzed by the Kruskal-Wallis and Dunn (5%) statistical tests. In the first and second collection, it was verified that groups G1 and G2 were statistically different from group G3 (p<0.05). In the third collection, groups G1C, G2A, G2C and G3C showed the lowest endotoxin values and were statistically similar to groups G1A, G1B, G3A and G3B (p>0.05).
Descrição
Palavras-chave
Escherichia coli, Endotoxina, Hipoclorito de sódio, Clorexidina, Hidroxido de calcio, Polimixina B
Como citar
MAEKAWA, Lilian Eiko. Avaliação in vitro da ação de substâncias químicas auxiliares e medicações intracanais sobre Escherichia coli e sua endotoxina em canais radiculares. 2007. 106 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Odontologia de São José dos Campos, 2007.