RESUMO ABSTRACTObjecti ve: To verify the presence or absence of microorganisms in resin composite samples (RCS), photoacti vated or not, and on the surfaces of RC cartridges (RCC) during clinical use in three dental offi ces (A, B, C) at the city of Fortaleza, CE, Brazil.
Method:The following groups were formed in the three dental offi ces, according to the substrates analyzed for contaminati on: G1 (control, n=10) -non-photoacti vated RCS, G2 (n=10) -RCS photoacti vated with LED, G3 (n=10) -RCS photoacti vated with halogen light, G4 (n=15) -RCC aft er clinical use. In the dental offi ces B and C, an additi onal G5 (n=5, control) was composed of RCC disinfected with alcohol 70 aft er clinical use. A total of 145 specimens were obtained. Swabs were used for sample collecti on in G4 and G5. In G1 to G3, 2-mm-thick increments of RC were obtained and photoacti vated or not for 20 seconds with a LED or halogen light source. The samples were then placed in test tubes with BHI broth and maintained under refrigerati on unti l incubati on in microaerophilia. Results: Contaminati on was found in 46.9% of the samples; G4 and G5 had 100% of contaminated samples (mean McFarland value of 7.0 ± 3.02). There was no stati sti cally signifi cant diff erence in the frequency of contaminati on among the dental offi ces A, B and C, in all groups, aft er analysis by the chi-square and Kruskal-Wallis tests (p=0.367 and p=0.090). There was no stati sti cally signifi cant diff erence between G1 and G2 and G3 aft er analysis by the Mann-Whitney test (p=0.396) nor between G2 and G3 (p=0.487) aft er analysis by the Pearson's chi-square test. Cocci (isolated or arranged in pairs, chains or clusters), bacilli (isolated or arranged in pairs or chains) and yeast were identi fi ed. Conclusion: Microorganisms were detected on the RC samples and on the surfaces of the RC cartridges in the three dental offi ces evaluated in this study.
Objeti vo:Verifi car a presença ou a ausência de microorganismos em amostras de resinas compostas (RC), fotoati vadas ou não, e nas superfí cies (S) de suas bisnagas durante o uso clínico em três clínicas odontológicas (A, B, C) da cidade de Fortaleza/CE. Método: Os seguintes grupos foram consti tuídos, de acordo com os substratos analisados para contaminação: G1 (controle, n=10) RC não fotoati vada, G2 (n=10) RC fotoati vada com LED, G3 (n=10) RC fotoati vada com luz halógena, G4 (n=15) RC após uso clínico. Nas clínicas B e C, um G5 adicional (n=5) foi composto por RC desinfetada com álcool 70 após o uso. Um total de 145 especímes foram obti dos. Uti lizou-se swabs para coleta de amostras de G4 e G5. Nos grupos G1 a G3, seccionou-se 2 mm de altura de RC, que recebeu ati vação ou não durante 20 segundos com LED ou luz halógena. As amostras foram inseridas em tubos de ensaio com BHI e manti das sob refrigeração até serem incubadas sob condições de microaerofi lia. Resultados: Encontrou-se contaminação em 46,9% do total de amostras; G4 e G5 apresentaram-se 100% contaminados, com média McFarland 7,0 ± 3,02. Não houve d...