Abstract: PURPOSE: To evaluate the disinfect effect after spraying a new kind of disinfectant on the dental plaster models. METHODS: The germ-free plaster samples, which were smeared with bacteria compound including Staphylococcus aureus, Escherichia coli, Saccharomyces albicans, Streptococcus mutans and Actinomyces viscosus were sprayed with disinfectants (CaviCide) and glutaraldehyde individually. In one group(5 minutes later) and another group(15 minutes later), the colonies were counted for statistical analysis after sampling, inoculating, and culturing which were used for evaluation of disinfecting efficiency. ANOVA was performed using SPSS12.0 software package. RESULTS: All sample bacteria were eradicated after spraying disinfectants(CaviCide) within 5 minutes and effective bacteria control was retained after 15 minutes. There was significant difference between the disinfecting efficiency of CaviCide and glutaraldehyde. CONCLUSIONS: The effect of disinfection with spraying disinfectants (CaviCide) on dental models is quick and effective.

Key words: Disinfection, Dental laboratory, Dental models, Impression, Spraying