Abstract
To investigate the influence of light intensity exposed to a photo-cured composite resin on the behavior of photo-polymerization, the heat flow during polymerization of photo-cured composite resin was measured by a modified differential scanning calorimeter(DSC) which installed the light curing unit with a high light intensity. Moreover, the relationship of the behavior of photo-polymerization to knoop hardness after hardening of the composite resin was investigated. In the results, the heat flow during photo-polymerization from starting the light exposure to the composite resin could be precisely obtained by modified equipment. There was significant correlation between the peak time of heat flow during the photo-polymerization and the inverse of the light intensity, and the peak time was close to 9 seconds with increased light intensity. The logarithm of the light intensity was also significantly related to the heat flow during the photo-polymerization and knoop hardness. Therefore, it was considered that photo-polymerization was simulated by the measurement of light intensity exposed to the composite resin.
