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Effect of refrigeration on shear bond strength of three dentin bonding systems
M S Hagge1, J S Lindemuth, J C Broome
1Department of Operative Dentistry, University of the Pacific School of Dentistry, San Francisco, USA.
Purpose:
To determine whether use of dentin bonding agents directly from refrigerated storage would have adverse effects on their shear bond strength to dentin.
Materials And Methods:
Resin-based composite cylinders were bonded to dentin on the ground occlusal surfaces of 60 extracted human molars using three different dentin bonding systems at 3.0 degrees C and 23.5 degrees C. The cylinders were then debonded using an Instron testing machine in compression mode at 0.5 mm/sec. The results were interpreted with t-test and Student-Newman-Keuls post hoc analysis.
Results:
Scotchbond Multi-Purpose demonstrated significantly lower shear bond strengths at 23.5 degrees C (P < 0.05) than all other groups at both 3.0 degrees C and 23.5 degrees C. All-Bond 2 and Prime & Bond had higher shear bond strengths at refrigerated temperature, but the differences were insignificant in magnitude.
