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KMID : 0358920070340020273
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Journal of the Korean Academy of Pedodontics
2007 Volume.34 No. 2 p.273 ~ p.284
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CHEMICAL DEGRADATION AND WEAR OF LIGHT-CURED COMPOSITE RESINS
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Yang Kyu-Ho
Jung Hee-Kyung
Choi Nam-Ki
Kim Seon-Mi
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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 esthetic restorative materials in an alkaline solution(0.1N NaOH). The composite resins studied were Composan LCM flow(Promedica, Germany). Clearfil ST(Kuraray medical, Japan), Durafi VS1(Heraeus Kulzer, U.S.A), Point 4(Kerr, U.S.A). The results were as follows :
1. The mass loss of each brand was 1.02{sim}6.04% and highest value in Durafil VS(6.04{pm}0.29%).
2. The sequence of the degree of degradation layer depth was in descending order by Durafil VS, Clearfil ST, Point 4 and Composan LCM flow. There were significant differences between Point 4, Composan LCM flow and the others (p<0.001). 3. The sequence of the Si loss was in descending order by Clearfil ST, Durafil VS, Composan LCM flow and Point 4. There were significant differences among the materials (p<0.001).
4. On SEM, destruction of bonding between matrix and filler and on CLSM, the depth of degradation layer of specimen surface was observed.
5. The sequence of maximum wear depth was in descending order by Durafil VS, Composan LCM flow, Point 4 and Clearfil ST. There were no significant differences among the materials (p>0.001).
6. The correlation coefficient between Si loss and degradation layer depth (r=0.892, p<0.01) and Si loss and mass loss(r=0.736, p<0.01) were relatively high.
These results indicate that hydrolytic degradation, wear and another factor may consider as evaluation factors of composite resins.
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KEYWORD
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Composite resin, Hydrolytic degradation, Wear
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