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J Korean Acad Pediatr Dent. 2009;36(1): 20-29.
A STUDY ON THE EFFECT OF POLYMERIZATION SHRINKAGE OF SEVERAL COMPOSITE RESIN USING STRAIN GAUGE
In-Cheon Lee, Jong-Soo Kim, Seung-Hoon Yoo
Dankook University, School of Dentistry, Department of Pediatric Dentistry
Corresponding Author: Jong-Soo Kim ,Tel: 041-550-193, Email: jskim@dku.edu
Received: May 19, 2008;  Accepted: December 23, 2008.
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ABSTRACT
This study was performed to evaluate the effect of the shrinkage stress induced by polymerization process of several light curing filling materials according to filling methods. High power light curing unit which has a plasma arc lamp was used and filling materials used were Filtek Z-250® composite resin, Dyract® AP compomer and Tetric® Flow flowable composite resin. Cavities were prepared on the permanent molars with width 3 ㎜, height 3 ㎜ and depth 1.5 ㎜ and the filling materials were filled with 1 step, 2 step layering technique and 3 step oblique filling methods. The results can be summarized as follows; 1. Strain values showed rapid increase from the start of light curing followed by gradual decrease afterwards with time. 2. Although the shrinkage stress value of Z-250® were shown to be relatively higher than Dyract® AP and Tetric® Flow, no statistically significant could be found between tested materials(p>0.05). 3. There were no statistically significant difference between 3 filling methods when using Dyract® AP and Z-250®(p>0.05). 4. There were no statistically significant difference between shrinkage stress values obtained from samples prepared by different filling methods and materials(p>0.05).
Keywords: Strain gauge | Shrinkage | Compomer | Composite resin | Filling method
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