The influence of ultrasound on the retention of cast posts cemented with different agents

Aim: The aim of this study was to evaluate the influence of ultrasound during the removal of posts cemented with either zinc phosphate cement, glass ionomer cement or resin cement. Methodology: Eighty-four single-rooted teeth were prepared and after cementation of cast posts, they were randomly divided into six groups of 14. Groups 1, 2 and 3 did not receive ultrasonic vibration, whilst groups 4, 5 and 6 received ultrasonic vibration for 10 min. The force necessary for post removal was determined using a universal testing machine. Results were statistically analysed using ANOVA and Tukey tests (5%). Results: The application of ultrasonic vibration reduced the retention provided by zinc phosphate and glass ionomer cements by 39% and 33%, respectively. Conclusions: A statistically significant reduction in the force necessary to remove posts cemented with zinc phosphate and glass ionomer cements occurred following application of ultrasound. The application of ultrasonic vibration did not influence the retention of cast posts cemented with resin cement.

Keywords

Cementation, Post removal, Retreatment, Ultrasound, biomedical and dental materials, dental alloy, glass ionomer, resin cement, tooth cement, zinc phosphate, analysis of variance, cementation, chemistry, clinical trial, controlled clinical trial, controlled study, dental care, dental debonding, human, instrumentation, mechanical stress, randomized controlled trial, statistics, surface property, time, tooth crown, tooth prosthesis, ultrasound, vibration, Analysis of Variance, Dental Alloys, Dental Casting Investment, Dental Cements, Dental Debonding, Dental Prosthesis Retention, Dental Stress Analysis, Glass Ionomer Cements, Humans, Post and Core Technique, Resin Cements, Statistics, Stress, Mechanical, Surface Properties, Time Factors, Ultrasonics, Vibration, Zinc Phosphate Cement