title: The air-powder dental abrasive unit--an evaluation using a model system.
abstract: Air-powder abrasive systems are used in dentistry to remove dental plaque, calculus and stain from the surfaces of teeth. A model system consisting of a thin layer (14 micron) of vacuum-deposited aluminium was used to demonstrate the effectiveness of such a system. Photomicrographic analysis showed two distinct areas of removal: an inner area where removal of aluminium was complete, surrounded by an area where removal was incomplete. With the aid of a relocation pin attached to the nozzle of the instrument it was demonstrated that nozzle-target distance, the air pressure input, the flow of water and the time of operation were all factors which affected the clinical efficiency of the instrument.
mesh_terms: D001639:Bicarbonates / Q000008:administration & dosage; D003777:Dental Prophylaxis / Q000295:instrumentation*; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D011208:Powders; D012964:Sodium / Q000008:administration & dosage; D017693:Sodium Bicarbonate; D013499:Surface Properties; D013997:Time Factors
chemical_list: D001639:Bicarbonates; D011208:Powders; D017693:Sodium Bicarbonate; D012964:Sodium