Magnetostrictive: all sides active, elliptical strokes piezo: lateral sides. Magnetorestrictive ultrasonic tips vibrate in an elliptical pattern and are active on all sides of the tip, whereas piezoelectric tips vibrate in a linear motion. Teeth were randomly assigned to the following two groups: Gracey curettes with 20 vertical strokes and a piezosurgery ultrasonic scaler in mode ROOT with a power of two. The linear motion of piezoelectric scaler tips makes these devices ideal for periodontal debridement and precise targeting of calculus deposits. What is the difference between movement of magnetostrictive and piezoelectric A. The investigators cite another study that found the use of magnetorestrictive ultrasonic scaling (the enduring Cavitron 660, Dentsply) had no effect of tooth restoration marginal integrity. These observations were of no surprise as sonic toothbrushes operate at 260 cycles per second whereas piezoelectric scalers vibrate at 25,000–50,000 cycles per second. The third group underwent SRP using a medium-power ultrasonic device (ultrasonic piezo scaler Uds-K, Woodpecker, China). The second group underwent SRP using a low-power ultrasonic device (ultrasonic piezo scaler Uds-K, Woodpecker, China). The higher the power setting, the greater the vibration and the more likely it is. The first group underwent SRP using Gracey curettes 1.2, 3.4, and 6.5 (HuFriedy Co., Chicago, IL, USA). Bevelling the margins of the cavity had no effect. Modern ultrasonic scalers are self-tuning and have a variable power control. In this in vitro study, the use of a piezoelectric ultrasonic device (Varios 750, NSK-Nakanishi Inc) at full power, but not the use of a sonic toothbrush (Sonicare, Philips Sonicare), was associated with microleakage at the cementum-composite interface but not the enamel-composite interface. However, there are concerns that the use of ultrasonic scalers may disrupt the marginal integrity of restorations. There would appear to be no evidence for, nor against, as to whether or not tooth scaling is associated with increased tooth sensitivity ( Am J Dent 2013 26: 21–27).
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