title: Effectiveness of 2% peracetic acid for the disinfection of gutta-percha cones.
abstract: The aim of this study was to evaluate the effectiveness of 2% peracetic acid for the disinfection of gutta-percha cones contaminated in vitro with Escherichia coli, Staphylococcus aureus, Streptococcus mutans, Candida albicans and Bacillus subtilus (in spore form). Two hundred and twenty-five gutta-percha cones were contaminated with standardized suspensions of each microorganism and incubated at 37°C for 24 h. The cones were divided into 10 experimental groups (n = 15), according to the microorganism tested and disinfection testing times. The disinfection procedure consisted of immersing each cone in a plastic tube containing the substance. The specimens remained in contact with the substance for 1 or 2.5 minutes. Afterwards, each cone was transferred to a 10% sodium thiosulphate solution (Na(2)S(2)O(3)) to neutralize the disinfectant. Microbial biofilms adhering to the cones were dispersed by agitation. Aliquots of 0.1 ml of the suspensions obtained were plated on Sabouraud dextrose agar, or brain and heart infusion agar, and incubated at 37°C for 24 h. The results were expressed in colony forming units (CFU/ml) and the data were submitted to the Wilcoxon Signed Rank Test (level of significance at 0.05). A significant reduction was observed, after 1 minute of exposure, in the test solution for C. albicans (p = 0.0190), S. aureus (p = 0.0001), S. mutans (p = 0.0001), B. subtilis (p = 0.0001), and E. coli (p = 0.0001). After 2.5 minutes of exposure, 100% of the microbial inocula were eliminated. It was concluded that the 2% peracetic acid solution was effective against the biofilms of the tested microorganisms on gutta-percha cones at 1 minute of exposure.
authors.affiliation: Department of Biosciences and Oral Diagnosis, São José dos Campos Dental School, Univ. Estadual Paulista, São José dos Campos, SP, Brazil.
authors.forename: Ana Carolina Rodrigues Danzi
authors.initials: AC
authors.lastname: Salvia
authors.forename: Guilherme Rodrigues
authors.initials: GR
authors.lastname: Teodoro
authors.forename: Ivan
authors.initials: I
authors.lastname: Balducci
authors.forename: Cristiane Yumi
authors.initials: CY
authors.lastname: Koga-Ito
authors.forename: Simone Helena Gonçalves de
authors.initials: SH
authors.lastname: Oliveira
mesh_terms: D001419:Bacteria / Q000187:drug effects / Q000302:isolation & purification; D002176:Candida albicans / Q000187:drug effects / Q000302:isolation & purification; D015169:Colony Count, Microbial; D004202:Disinfectants / Q000494:pharmacology*; D004203:Disinfection / Q000379:methods; D006171:Gutta-Percha; D006801:Humans; D010463:Peracetic Acid / Q000494:pharmacology*; D012387:Root Canal Filling Materials; D013997:Time Factors
chemical_list: D004202:Disinfectants; D012387:Root Canal Filling Materials; D006171:Gutta-Percha; D010463:Peracetic Acid