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KMID : 0362320090340010030
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Journal of Korean Academy of Operative Dentistry
2009 Volume.34 No. 1 p.30 ~ p.37
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EFFECT OF PRE-HEATING ON SOME PHYSICAL PROPERTIES OF COMPOSITE RES
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Jin Myoung-Uk
Kim Sung-Kyo
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Abstract
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The purpose of this study was to evaluate the effect of pre-heating on some physical properties of composite resin. Eighty extracted, noncarious human molars were used in the present study. Four different temperatures of composite resin were used: , , , and . The and values represented the refrigerator storage temperature and room temperature respectively. For and , composite resin was heated to the temperatures. As physical properties of composite resin, shear bond strength, microhardness, and degree of conversion were measured. The data for each group were subjected to one-way ANOVAs followed by the Tukey’s HSD test at 95% confidence level. Both in enamel and dentin, among composite resin of , , and , the pre-heated composite resin up to revealed the highest shear bond strength, and pre-heated composite resin to the higher temperature revealed higher shear bond strength. Microhardness value was also higher with composite resin of higher temperature. Degree of conversion was also higher with composite resin of the higher temperature. In this study, it seems that pre-heating composite resin up to the higher temperature may show higher shear bond strength, higher microhardness value, and higher degree of conversion. Therefore, when using composite resin in the clinic, preheating the composite resin could be recommended to have enhanced physical properties of it.
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KEYWORD
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Composite resin, Pre-heating, Shear bond strength, Microhardness, Degree of conversion
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