Journal of the Korean Academy of Pediatric Dentistry 2009;36(2):189-198.
Published online May 31, 2009.
POLYMERIZATION SHRINKAGE OF COMPOSITE RESIN USING DOUBLE CURING UNIT SYSTEM
단국대학교 치과대학 소아치과학교실 
Correspondence:  , 
Received: 12 September 2008   • Accepted: 17 February 2009
Abstract
As a part of an effort to minimize the polymerization shrinkage which is considered to be a major cause of failed bonds to tooth, newly designed 'Double LED system' was tested in the present study. Analyses were performed on the pattern of micro-leakage and the changes of strain which have occurred during the polymerization process. The results can be summarized as follows: 1. In the strain change, dramatic increase was observed with initiation of polymerization which was followed by subsequent gradual decrease with elapse of time in both the single LED system and double LED system. 2. The single LED system were shown to develop and maintain the maximum stress more than double LED system(p<0.05). 3. Less micro-leakage was found in the double LED system than in the single LED system(p<0.05). From the above-mentioned results, the double LED system can be a very useful tool in a sense of reducing polymerization shrinkage when compared to the single LED system. However, practical problems such as size of curing unit and its application method with its light intensity should be solved before its clinical application.
Key Words: Composite resin, Light curing, Polymerization shrinkage, Strain gauge


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