[Bacteriological studies of dental units in conservative dentistry as well as requirements and recommendations for hygiene in dental practice].

Four different dental units (Sirona 2000, Sirodont S, Sirona 2000 and Siro I) used in conservative dentistry were investigated bacteriologically by analysing water samples from the tumblers, the assistant's spray, micromotors, hand sprays at the units and from the scalers. The results of the analysis (shown in Table 2-5) reveal that micro-organisms of the Pseudomonas group were mainly found in the turbines and also in the micromotors. In other areas of the equipment micro-organisms of the acinetobacter species were frequently identified. The germ counts were very high, especially in the morning, and not infrequently reach levels as high as 50,000 germs/ml. For disinfection isopropyl alcohol and Tego 103 S were used; the latter was found to produce a good disinfecting action following prolonged exposure. Further requirements and recommendations for hygiene in the dental practice are briefly discussed.