In the past thirty years, the use of light-cured composite resins for direct filling as an aessthetic restorative material has grown rapidly. But it has been proven this material has very poor color stability. The purposes of this study was to
evaluate
the color change, water sorption and solubility of two microfilled and three hybrid composite resins after storage for one week in distilled water at 37℃and color change after thermocycled between 5℃and 65℃
The results were as follows;
1. Among samples which immersed in 37℃distilled water for 1 week, Clearfil-Photoposterior showed the laget change. The others were almost same.
2. In the group of 5 to 65℃thermocycling 5,000 times and 10,000 times, Silux-plus showed the largest color change and Z-100 had the smallest. Clearfil-Photoposterior and Herculite XR showed significant difference in discoloration between 5,000
and
10,000 times cycled group.
3. Bisfil -M and Silux-plus showed more water sorption than Herculite XR, Z-100 and Clearfil-photoposterior. The reason for this is likely due to these materials are microfilled. Among the all tested materials, Silux-plus showed highest and
Clearfill-Photoposterior showed the lowest water sorption. This may be attributed to filler content of the materials.
4. Silux-Plus which was mocrofilled showed the highest wate4r solubility. Bisfil-M, Z-1--, and Clesrfil-Photoposterior showed the lowest values.
It was concluded that the filler content and type of ;the light cured composite materials had no effect on the discoloration of the tested materials. It also was proven that water sorption and solubility had no correlation.
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