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Abstract
T I n prosthetic practice, rotary diamond instruments possess advantages for the removal of hard dental tissues, particularly when used in ultrahigh-speed equipment.lq3 Diamond instruments are suitable for the removal of the enamel, because they resist abrasion and have a longer life-span than tungsten carbide burs. There are only a few basic shapes of diamond points for ultrahigh-speed equipment. These points are all made to small dimensions in view of the extremely high circumferential speed and high efficiency. A new technique of electron microscopy, called scanning electron microscopy (SEM) , has made possible detailed examination of the surfaces of the diamond rotary instruments. An image obtained by this method is three dimensional, of high clarity, and has extraordinary depth of focus. 5-7 By means of the SEM, an investigation of diamond points disclosed (1) distinct differences in the quality of the materials and the workmanship and (2) alterations which take place after use.
Published Version
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