Análise microbiológica de cones de guta-percha disponíveis no mercado brasileiro / Microbiological analysis of gutta-percha cones available in the brazilian market

RESUMO

Objetivo: Analisar a contaminacao na superficie dos cones de guta-percha de diferentes fabricantes disponiveis no mercado nacional e identificar os microrganismos isolados. Metodo: 34 cones de guta-percha acessorios, provenientes de caixas lacradas ou manipuladas, foram analisados. Trinta cones foram divididos, aleatoriamente, em 6 grupos experimentais com 5 cones cada, diferenciados segundo o fabricante e a sua proveniencia (caixas lacradas ou manipuladas). Quatro cones oriundos de caixas lacrada ou manipulada foram utilizados como controles positivo (contaminado com saliva fresca) e negativo (imerso em solucao de hipoclorito de sodio a 5,25% por 1 minuto). As analises microbiologicas foram realizadas submergindo os cones em tubos contendo caldo Brain-Heart Infusion (BHI) e, posteriormente, semeando uma aliquota deste caldo em Agar sangue. A leitura foi realizada atraves da visualizacao de turvacao no caldo ou crescimento de colonias no meio solido. Os dados obtidos foram analisados pelos testes Kruskal-Wallis e Qui-Quadrado com nivel de significancia de 5%. Resultados: Observou-se crescimento bacteriano em 2 amostras. Os generos encontrados foram Staphylococcus e Bacillus. Os resultados indicaram que 6,67% dos cones de guta-percha de embalagens lacradas ou manipuladas estavam contaminados, mas nao houve diferenca estatistica entre os grupos experimentais. Conclusao: Existe um risco de contaminacao dos cones de guta-percha. Portanto estes materiais devem ser desinfetados a fim de garantir a seguranca necessaria para o sucesso do tratamento endodontico.

ABSTRACT

Objective: To analyze the contamination on the surface of gutta-percha cones from different manufacturers available in the national market and to identify the isolated microorganisms. Method: Thirty-four accessory gutta-percha cones obtained from sealed or violated packages were analyzed. Thirty cones were randomly divided in 6 experimental groups with 5 cones each, according to their manufacturer and origin (sealed or violated packages). Four cones obtained from sealed or violated packages were used as positive (contaminated with fresh saliva) and negative (immersed in 5.25% sodium hypochlorite solution for 1 minute) controls. The microbiological analyses were performed by submerging the cones in tubes containing Brain-Heart Infusion (BHI) broth, and then seeding an aliquot of this broth in agar blood. The analysis was based on the turbidity of the medium or growth of colonies in the solid medium. Data were analyzed by the Kruskal-Wallis and chi-square tests at 5% significance level. Results: There was bacterial growth in 2 samples. Staphylococcus and Bacillus genera were found. The results indicate that 6.67% of the gutta-percha cones from sealed or violated packages were contaminated without statistically significant difference between the experimental groups. Conclusion: There is a risk of contamination of gutta-percha cones. Therefore, these materials must be disinfected to ensure the safety necessary for the success of endodontic treatment.