¢ Acoustic streaming is the rapid movement of particles of fluid in vortex(circular)-like motion about a vibrating object.
¢ When a vibrating file is immersed in a fluid, the file is observed to generate a streaming fluid comprising two components:
¢ Primary field consisting of rapidly moving eddies in which the fluid element oscillates about a mean position, and a superimposed secondary field consisting a patterns of relatively slow, time independent flow. Characteristically the fluid is transported from the apical end to the coronal end.
¢ In a endosonic file the greatest shear stresses will be generated around points of maximum displacement, such as the tip of the file and the antinodes along its length
¢ it is probable that will also be important in moving the associated irrigant around the canal so that maximum benefit is achieved from the chemical irrigant.
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Martin H. the ultrasonic synergistic system of endodontics. Endod Dent Traumatol 1985;1:201– 6.
Ahmad M. Ultrasonic debridement of root canals: acoustic cavitation and its relevance. J Endod 1988;14:486 –93.
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