Abstract
Shear bond strength of Composite / Amalgam restorations: Effect of using adhesive cement
Dr. M. Khoroushi *- Dr. M. Yeganehjo **
*Assistant Professor of Operative Dentistry & Dental Materials Dept., Faculty of Dentistry, Isfahan University of Medical Sciences.
** Dentist.
Abstract
Background and Aim: The aim of this study was to evaluate the shear bond strength (SBS) of composite/amalgam restorations when adhesive resin cement was used.
Materials and Methods: 60 Acrylic cylinders were prepared using special Teflon molds. A square-shaped cavity was made at the center of each cylinder. The samples were divided into four groups (n=15). After amalgam condensation and burnishing in the first group, a two parts Teflon die with a cylindrical hole at the center was placed on the amalgam surface. These holes were filled with composite-resin. Single bond and Rely X-ARC were applied on amalgam surfaces respectively, prior to curing the composite-resins in the second group. In groups 3 and 4, the prepared amalgam samples were kept in 37â—¦C for 24 hours. Then they were identically roughened using burs. In group 3, composite was bonded immediately and in group 4, first single bond, and then Rely-X ARC were applied before curing the composite. The SBS was determined by DARTEC testing machine.
Results: The mean SBS for the study groups were 9±2.77, 8.74±6.42, 6.13±2.35 and 8.25±1.43 respectively. The maximum value was related to group 1 and the minimum value belonged to group 3. However, there were no significant differences between the study groups.
Conclusion: Application of Rely X-ARC in amalgam/composite interface did not cause any significant difference.
Key words: Amalgam - Composite-resin - Bond strength - Adhesive resin cement
Correspondence Author: Operative & Dental Materials Dept., Faculty of Dentistry, Isfahan University of Medical Sciences. e.mail:Khoroushi@dnt.mui.ac.ir