[Frequency of blood contamination of the dentist during conservative and prosthetic treatment].

The endangerment caused by the blood contents of spray formed in the course of oonserving and prosthetical work of dentists performed by dental drill was examined. It was found that the protective mask in case of grinding and drilling the front teeth becomes always while in case of treating the molars less frequently soiled. In the course of prosthetical work it occurs frequently that bloody spray reaches the hair of the physician. Frequency of soiling is independent of the type of the machine used. The matrix strips and -strechers were always bloody after use.