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KMID : 0358920010280010045
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Journal of the Korean Academy of Pedodontics
2001 Volume.28 No. 1 p.45 ~ p.53
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A STUDY OF THE EFFECT OF LOW INTENSITY INITIAL LIGHT CURING ON THE BOND STRENGTH OF RESIN RESTORATION
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Han Mi-Ran
Kim Soon-Won
Kim Jong-Soo
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Abstract
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Recently some studies have shown that low light intensity followed by final cure at high light intensity may result in a smaller marginal gap and may be no negative effect on material properties. The purpose of this study was to evaluate the influence of the initial cure with low intensity on the shear bond strength of dentin and the microhardness of composite resin. Twenty intact bovine teeth were prepared for shear bond strength test and each tooth sectioned to three specimens. The specimens were randomly divided into three groups according to the light intensity and curing time as follows; Group I. 40sec Group II. 20sec and 20sec Gropu III. 20sec and 20sec. Samples of each group were restored with light-cured composite resin after dentin bonding and then the shear bond strength of each specimen were measured using universal testing machine. Ten resin specimens per group were prepared. After 24 hours, the Vickers microhardness value was measured at the top and bottom surfaces. The result are as follows; 1. Mean value of low initial intensity groups(II, III) were higher than the control group(I) in shear bond strength, but no significant difference could be found. 2. No significant difference could be found between three groups in microhardness.
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KEYWORD
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Low initial intensity, Shear bond strength
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