¢ 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.
Martin H. the ultrasonic synergistic system. Int Dent J 1984;34:198 –203.
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.
