The effect of ultrasonic scaling on the surface of Class V amalgam restorations--a scanning electron microscopy study.

Class V cavities were prepared on twelve extracted teeth and then filled with amalgam which was condensed in six cases by hand and six by mechanical means. SEM records were obtained before and after ultrasonic scaling of the restored area. They showed that such scaling had a deleterious effect on the surface of the amalgam and its marginal integrity. However the mechanically condensed specimens were less affected.