| 摘要 |
Improvements are provided for a dental air abrasive system of the type which utilizes a compressed gas or air which creates a gas stream. Abrasive particles are introduced into the gas stream and expe lled out through one end of a nozzle whereupon the abrasive laden gas stream impinges upon the target, i.e. tooth amalgam, comp osites, stain and/or tooth dental filling materials. The improvements include the use or two or more hoppers each containing diff erent sized abrasive particles, which are selectively fed either together or independently of each other, into the gas stream. Dif ferent sized abrasive particles are provided in each hopper for cutting different types of tooth structures. Other improvements i nclude the use of fluorescent and/or colored abrasive particles to facilitate the aiming process, a laser beam, strobe, white ligh t or other illuminating means for aiming the abrasive stream and/or illuminating the target area as well as a disposable nozzle fo r hygienic reasons. Other improvements include the use of a vacuum evacuation system to minimize dusting of the abrasive partic les, as well as a dam removably positioned within the patient's mouth which reflects the abrasive particles back towards the e vacuation system. Still other improvements include the use of a microvalve adjacent the nozzle which, when closed, terminates gas f low through the fluid passageway in order to further minimize dusting of the abrasive particles.
|
