Evaluation of the shear bond strength of alloybond amalgam adhesive with and without using of different retentive means

Abstract EN

Background: Many problems result with the use of pins and with development of the dentin adhesives reason for minimizing of dentin pin usage have emerged.

The aim of the study was to evaluate the shear bond strength of alloybond amalgam adhesive with and without using of different retentive means.

Materials and Methods: Fifty sound 1st premolar teeth of similar size and shape were used in this study.

The occlusal surfaces were ground to have flat superficial dentin.

The specimens were divided into five groups which received different retention methods (two pins, alloybond-SDI Australia, two grooves (1mm depth and 1mm in diameter).The specimens were stored at 37°C for 24 hrs after thermocycling before testing by using Instron testing machine, with cross head speed 0.5 mm/min until the amalgam fracture from the tooth.

The mode of failure which is adhesive, cohesive or mixed was examined.

Results: There was a high significant differences (p<0.01) among all the groups.

Highest shear bond strength values were seen in group of 2 pins and alloybond and the lowest bond strength were related with the use of 2 grooves while the other groups were between them.

Conclusion: The use of pins with the alloybond produced superior shear bond strength and there was no significant difference between the use of pins, and the use of 2 grooves with alloybond.

Keywords: Shear bond strength, amalgam, bonding agent.

(J Bagh Coll Dentistry 2007; 19(1)16-19)