Ahmad M, Roy R A, Kamarudin A G, Safar M
Department of Conservative Dentistry, University of Malaya, Kuala Lumpur, Malaysia.
Int Endod J. 1993 Mar;26(2):120-4. doi: 10.1111/j.1365-2591.1993.tb00553.x.
The pattern of oscillation of a Piezon-Master 400 ultrasonic file driven by a piezoelectric transducer was studied in air and on water. In addition, the displacement amplitudes of the files were measured. The findings were compared with those observed with the Cavi-Endo unit reported in another study (Ahmad 1969). It was observed that the file vibrated such that a standing wave was formed on the file and it exhibited points of maximum deflection (antinode) and points of minimum deflection (node) with the largest deflection occurring at the apical end. This pattern of oscillation was similar to that exhibited by the Cavi-Endo file which employed a magnetostrictive transducer. However, the displacement amplitudes were very much higher than those exhibited by the Cavi-Endo. It is considered that the 120 degrees angle of the file holder inherent in the Piezon-Master 400 unit and the more effective power transmission with the piezoelectric transducer may have contributed to the large amplitudes.
研究了由压电换能器驱动的Piezon-Master 400超声锉在空气中和水面上的振荡模式。此外，还测量了锉的位移幅度。将这些结果与另一项研究（艾哈迈德，1969年）中报道的使用Cavi-Endo装置观察到的结果进行了比较。观察到锉振动时，在锉上形成了驻波，并且呈现出最大偏转点（波腹）和最小偏转点（波节），最大偏转发生在根尖端。这种振荡模式与采用磁致伸缩换能器的Cavi-Endo锉所呈现的模式相似。然而，位移幅度比Cavi-Endo锉所呈现的幅度要高得多。据认为，Piezon-Master 400装置中锉夹的120度角以及压电换能器更有效的功率传输可能促成了大幅度的产生。
