OBJECTIVEThe disinfection efficiency of a compound disinfectant spray with trichioro hydroxyl diphenyl ether on dental impression and plaster model, which have been contaminated by pathogens, were evaluated in this study.

METHODSAs experimental group, germ-free alginate impressions and plaster models were sprayed with the compound disinfectant of different density trichloro hydroxyl diphenyl ether or indophors for 5, 10 and is mm, after which were smeared with five tested pathogens, including Staphylococcus acre us, Escherichia cali, Saccharomyces albicans, Streptococcus mutans and black spore variants of Bacillus subtilis. The colonies were counted after sampling, inoculate and culture, which were used to deduce the killing logarithm value as the standard of the disinfecting efficiency.

RESULTSthe compound disinfectant spray with 3000 mg x L(-1) triebloro hydroxyl diphenyl ether was effective to all tested pathogens for 10 mm whatever on the impressions or the plaster models. The disinfectant spray with tame concentration was more effective on the alginate impression than on the plaster model in the same time (P = 0.000).

CONCLUSIONThe compound disinfectant spray with trichioro hydroxyl diphenyl ether is an effective antiseptics for alginate impressions and plaster models.