adapts to dentistry a suction or vacuum principle first used in industry. It pro­ vides a means of cleansing the operating field with copious isothermal irrigation. The debris is then removed by a power­ ful but nevertheless a gentle vacuum air stream. Human tissues are maintained in their natural wet state. Pain, trauma and post­ operative complications are reduced. Desiccation of hard and soft tissues is avoided. Heat is eliminated from den­ tistry. The technic permits use of the rubber dam with copious irrigation on the operative field. Operating vision is improved. Caries can be differentiated more accurately. The time and cost of dental operations are reduced. Patient expectorating is eliminated. Cutting need no longer be intermittent. High-speed instruments can be used more readily and multiple units of work can be accom­ plished in one appointment. The cost of instrument maintenance is reduced. Pre­ cious metals can be salvaged. Patient psychology is improved. Cleanliness is facilitated. 3535 South Hillside Lane