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KMID : 0358920050320030509
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Journal of the Korean Academy of Pedodontics
2005 Volume.32 No. 3 p.509 ~ p.516
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A STUDY ON THE RELATIVE SHEAR BOND STRENGTH OF COMPOSITE RESIN TO COMPOMERS
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Jeong Song-Ran
Choi Nam-Ki
Yang Kyu-Ho
Kim Seon-Mi
Song Ho-June
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Abstract
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For the purpose of comparing the bond strengths of compomers to composite resin, composite 2250, and two polyacid modified composite resin, Dyract AP and F2000, were selected and investigated using universal testing machine for measuring the shear bond strengths. Additionally, the failure modes were examined by observing the fractured surfaces of each specimen. The following results were obtained.
1. The shear bond strength of Dyract AP to Z250 were higher than those of F2000, but there was no statistically significant difference between group 1 and group 3(p＞0.05), and groups using fresh compomers showed higher bond strength than those using aged compomers(p＜0.05).
2. After measuring the shear bond strength of each group, it was highest in group 5 and was lowest in group 9(p＜0.05).
3. Although there was no statistically significant difference, groups treated with thermocycling showed lower bond strengths than those of non-thermocycling groups.
4. Overall compomer/composite resin failures were adhesive. Cohesive failures occurred mainly in groups using bonding agent.
Based on these results, the application of a bonding agent on fresh polyacid-modified resin composite increases the bond strength between polyacid-modified resin composite and composite resin. Additionally, the surface of aged polyacid-modified resin composite has to be roughened mechanically and a bonding agent has to be used in combination with composite resin.
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KEYWORD
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Compomer, Shear bond strength, Thermocyling, Failure
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