Lumley P J, Walmsley A D, Marquis P M
Unit of Conservative Dentistry, School of Dentistry, University of Birmingham, UK.
J Dent. 1994 Dec;22(6):376-9. doi: 10.1016/0300-5712(94)90093-0.
This study investigated the effect of air inlet ring opening on the oscillatory pattern of the MM 1500 sonic handpiece and files. The oscillatory pattern of the driver head and files in air and under load was determined microscopically. The results showed that a critical opening of the air inlet ring was necessary to elicit oscillation of the driver head and sonic file. The driver oscillated in an elliptical manner, the displacement of which varied with air inlet ring opening. When operated in air the file exhibited an elliptical movement which was influenced by different design, length and thickness. This action was constrained under load and replaced by a longitudinal action of the same dimension for all files which appeared to have an efficient cutting action. This work shows that air inlet ring opening increases oscillation of the driver head once a critical opening has been reached and that clinical loading does not constrain the cutting action of the file.
本研究调查了进气环开口对MM 1500声波手机及锉的振荡模式的影响。通过显微镜确定了驱动头和锉在空气中及负载下的振荡模式。结果表明，进气环的临界开口对于引发驱动头和声波锉的振荡是必要的。驱动头以椭圆形方式振荡，其位移随进气环开口而变化。在空气中操作时，锉呈现椭圆形运动，该运动受不同设计、长度和厚度的影响。这种动作在负载下受到限制，并被所有锉相同尺寸的纵向动作所取代，这些锉似乎具有有效的切割作用。这项工作表明，一旦达到临界开口，进气环开口会增加驱动头的振荡，并且临床负载不会限制锉的切割作用。
