| 摘要 |
A protective system for dentist chill units including a protective element and a sealing substance around the drill to prevent the entrance of undesirable matter such as the HIV (AIDS) virus into the handpiece holding the drill, which may, when the drill is replaced by another drill, infect the next patient, the system including an optional device including at least one valve for preventing undesirable matter such as the HIV virus from remaining in the water system after possible entry through one or more water nozzles in the handpiece, once the water is pumped out and possibly replaced by disinfectant, and then again with cooling water.
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