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KMID : 0988420010130030268
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Journal of Dental Science (C.N.U.)
2001 Volume.13 No. 3 p.268 ~ p.278
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Chemical Degradation of three Compomers in NaOH
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Abstract
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Ideal restorative materials should have not only physical and chemical properties covering the chewing function and esthetics but also biological adaptability and durability to oral environmental changes. However when the restoration was exposed to oral environment for a long time, surface degradation of restoration, discoloration and destruction of restoration itself could be occurred.
One of the major deficiencies of compomers using in pediatric dentistry in recent years is insufficient resistance to wear. Of the multitude of factors that have been associated with wear, subsurface degradation within the restoration is considered to be one.
The aim of this study was to evaluate the resistance to degradation of three commercial compomers in an alkaline solution. Dyract(Dentsply), Elan(Kerr) and F-2000(3M) polyacid-modified resin composites(compomers) were used in this study. Preweighed discs of each material were exposed to 0.1N NaOH solution at 60℃ for 2 weeks.
The resistance to degradation was evaluated on the basis of mass loss(%), degradation depth(㎛) and Si, Al, Ba loss(ppm).
The results were as follows:
1. The mass loss of each brand was 1.42%∼2.14% and there was no statistically significant difference of mass loss among Dyract, F2000 and Elan.
2. The degradation layer depth of each brand was 182.92㎛∼227.7㎛ and there was no statistically significant difference of degradation layer depth among Dyarct, F2000 and Elan.
3. There were statistically significant difference of Si-loss and Al-loss among three compomers (p＜0.05). Si loss was the highest value in Dyract and Al loss was the highest value in F2000.
4. There was statistically significant correlation between mass loss and degradation layer depth(r=0.60, p＜0.05).
5. In SEM finding, there was destruction of compomer matrix-filter interface in post-exposure specimen to NaOH solution. As the matrix decreased, the filler particles distinguished and the periphery of the filler particles were appeared whitish color due to degradation.
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