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KMID : 0358920040310040685
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Journal of the Korean Academy of Pedodontics
2004 Volume.31 No. 4 p.685 ~ p.695
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ABRASION AND CHEMICAL DEGRADATION OF LIGHT-CURED COMPOSITE RESIN FOR UPDATED RESIN DEVELOPMENT
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Yang Kyu-Ho
Choi Nam-Ki
Yuk Gun-Yeung
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Abstract
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The aim of this study was to evaluate the resistance to degradation and to compare the wear resistance characteristics of four composite resins in an alkaline solution. The resistance to degradation was evaluated on the basis of mass loss(%), degradation depth(㎛). Si loss(ppm) and wear depth.
The brands studied were Heliomolar flow, Filtek supreme. Point4, Tetric flow.
The results were as follows:
1. The sequence of the mass loss was in descending order by Heliomolar flow, Filtek supreme, Point4, Tetric flow. There was significant differences among the materials except Heliomolar flow and Filtek supreme.
2. The sequence of the degree of degradation layer depth was in descending order by Filtek supreme, Heliomolar flow, Tetric flow, Point4. There were significant differences among the materials except Heliomolar flow and Tetric flow.
3. The sequence of Si loss was in descending order by Filtek supreme, Heliomolar flow, Point4, Tetric flow. There were significant differences among the materials except Point 4 and Tetric flow.
4. The sequence of maximum wear depth was in descending order by Heliomolar flow, Point4, Filtek supreme, Tetric flow and there was increasing wear depth on soaking in 0.1N NaOH solution.
5. When observed with SEM, destruction of bonding between matrix and filler was observed and when observed with CLSM, the depth of degradation layer of specimen surface was observed.
There results indicate that wear and hydrolytic degradation could be considered to be evaluation factors of composite resins.
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KEYWORD
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Composite resin, Wear, Subsurface degradation, Filler
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