J Korean Acad Prosthodont.  1997 Sep;35(3):504-516.

STUDY OF THE EFFECT OF ULTRASONIC INSTRUMENTATION ON BOND STRENGTH OF SEVERAL DENTAL CEMENTS

• Kim WS
• Lim JH
• Cho IH

Abstract

Ultrasonic instruments transfer electrical energy to mechanical energy resulting in vibration used for various dental treatments. If we could know the effect of ultrasonic instruments on the dental cements within the cast crown, we could take care when conducting periodontal surgery and when using the ultrasonic instruments to remove cast crown, it would be much more convenient. The purpose of this study was to compare the bond strength of several dental cements according to ultrasonic instrumentation time In this study 4 types of cements were used to cement the specimens. They were treated with ultrasonic instrumentation for 0-5 minutes and the change in bond strength were statistically compared The results were as follows : 1. The tensile bond strength of zinc phosphate cement decreased according to the increase in time of ultrasonic instrument and showed significant differance between 0 minutes and the others and between 1 minute and 2,3,4,5 minutes (P<0.05) 2. The tensile bond strength of polycarboxylate cement decreased according to the increase in time of ultrasonic instrument and showed significant differance between 5 minutes and the others and between 4 minute and 0 minutes (P<0.05) 3. The tensile bond strength of zinc phosphate cement decreased according to the increase in time of ultrasonic instrument and showed significant differance between 5 minutes and the others (P<0.05) 4. The tensile bond strength of resin cement showed no statistically differences according to the ultrasonic instrumentation time In conclusion, it this considered that zinc phosphate cement is most affected by ultrasonic instrumentations and resin cement is the least affected. When using ultrasonic instruments the result above should be used as an index.

MeSH Terms

Crowns
Dental Cements*
Polycarboxylate Cement
Resin Cements
Ultrasonics*
Vibration
Zinc Phosphate Cement
Dental Cements
Polycarboxylate Cement
Resin Cements
Zinc Phosphate Cement