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KMID : 0358920060330020233
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Journal of the Korean Academy of Pedodontics
2006 Volume.33 No. 2 p.233 ~ p.243
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EFFECT OF C-FACTOR AND LAYERING TECHNIQUE ON THE CONTRACTION FORCE OF COMPOSITE RESIN RESTORATION TO TOOTH SURFACE
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Lee Bong-Kyu
Lee Nan-Young
Lee Sang-Ho
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Abstract
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The aim of this study was to investigate the relationship between the C-factor and shinkage strain values of composite resin and examine the strain values in different incremental filling techniques. Experiment consisted two aims. First, we compared with strain value in two different C-factors(3.7 and 1.0). Second, we examined the strain values in three different filling techniques.
The results of the present study can be summarized as follow:
1. High C-factor groups showed higher contraction stress values than low C-factor groups at 900 sec after polymerization.
2. Hybrid resion showed higher contraction stress values than flowable resin in high C-factor cavities. But contraction stress was not revealed signivicant difference between hybrid resin and flowable resin in low C-factor cavities(P>0.05).
3. Bulk filling with hybrid resin(Group 1) showed high contraction stress and lining with flowable resin followed hybrid resin(Group 5) showed lower contraction stress.
4. Contraction stress were increased during 900 sec after polymerization in high C-factor groups but decreased gradually after 900 sec.
5. Low C-factor groups showed tight marginal seal between resin and cavity wall but high C-factor groups showed gaps formed between resin and cavity wall in part.
On the basis above results, layering techniques in high C-factor cavity showed abvantages in reducing contraction stress and gap formation between cavity wall and resin restoration.
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KEYWORD
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Composite resin, Light curing, C-factor, Polymerization shinkage, Contraction stress
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