| elimination of microorganisms from dental operatory compressed air. | compressed air is used to power high-speed handpieces, as well as to dry and clean surfaces in the oral cavity during patient treatment, in all dental operatories. the compressed air used in the dental operatories located in large institutions such as universities or hospitals is generally obtained from a central source, and is produced by continually running compressors. in operatories located in private practice settings, compressed air is obtained from small on-site air compressors, which may ... | 1998 | 9473876 |