Brazilian Dental Journal
versão On-line ISSN 1806-4760
AGOSTINHO, Alessandra Marçal et al. Braz. Dent. J. [online]. 2004, vol.15, n.2, pp. 138-143. ISSN 1806-4760. http://dx.doi.org/10.1590/S0103-64402004000200010.
Polishing of dental prostheses can cause a dangerous cycle of cross-contamination involving dentists, laboratory technicians, patients and auxiliary personnel. The aim of this study was to show the microbial contamination in the dental laboratory during the polishing procedure of complete dentures. For this purpose, 4 experiments were conducted. Experiment I - Determination of the total colony-forming units (CFU) counts contaminating complete maxillary dentures. During the polishing procedure, determination of the CFU counts transferred to the operator (Experiment II) and of the total CFU counts transferred to previously sterilized complete dentures (Experiment III). Experiment IV - The total counts of remaining CFU in the lathe spindle after Experiments II and III. Complete dentures were highly contaminated (mean = 1.4 x 107 CFU/mL). There was a elevated level of contamination by splatter and aerosols. There was high microbial transfer from the contaminated lathe spindle to the sterile prostheses (mean = 1.7 x 107 CFU/mL). The spindles were highly contaminated after polishing procedures (mean = 3.5 x 108 CFU/mL). The polishing of dental prostheses is a possible source of transmission of communicable diseases in the laboratory and requires improved techniques for infection control.
Palavras-chave : cross infection; dental laboratory; dental prostheses.