Abstract
Some dentists who have employed the ultrasonic method of preparing cavities and patients who have experienced its use express favorable comment. Pulps of vital permanent teeth appear to be unaffected, but operations on children's teeth should not be attempted until future research indicates no ill effects. The original cost of the unit, its size, and the fact that it is strictly an adjunct to the present armamentarium of the dentist will probably be a deterrent to its acceptance. Cleaning and attaching the tips, tuning the machine, and applying the correct load while operating are discouraging aspects to the beginner. The ultrasonic method of cutting carious or sound enamel, carious or sound dentine, and certain types of restorative materials does not approach the effectiveness that can be demonstrated with the ultra high-speed rotational instruments.
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