J Korean Acad Conserv Dent.  2009 Jan;34(1):30-37. 10.5395/JKACD.2009.34.1.030.

Effect of pre-heating on some physical properties of composite resin

Affiliations
  • 1Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu, Korea. skykim@knu.ac.kr

Abstract

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: 4degrees C, 17degrees C, 48degrees C, and 56degrees C. The 4degrees C and 17degrees C values represented the refrigerator storage temperature and room temperature respectively. For 48degrees C and 56degrees C, 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 4degrees C, 17degrees C, 48degrees C, and 56degrees C, the pre-heated composite resin up to 56degrees C 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.

Keyword

Composite resin; Pre-heating; Shear bond strength; Microhardness; Degree of conversion
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