THE INFLUENCE OF ULTRASOUND IN REMOVING INTRARADICULAR POSTS

Thirty single-rooted teeth were prepared to receive cast posts. After cementation of the post the teeth were divided into three groups. Grou p I did not receive any treatment, whereas the posts in groups II and III were treated with an ultrasonic device, for 2 min and 5 min, respe ctively. The force required for post removal was determined using a un iversal test machine. No statistical differences (P > 0.05) were found between the groups where ultrasound had been used. Significantly redu ced forces were necessary to remove the posts from group II and III, c ompared with group I which did not receive ultrasonic treatment (P < 0 .05).