중합가시광 파장대에 따른 심미성 수복재의 미세경도 변화 = Microhardness of esthetic restorative materials cured by 3 types of narrow-banded wavelength

다국어 초록 (Multilingual Abstract)

There are several factors affecting the effectiveness of polymerization of the esthetic restorative materials. Among those factors, the initiator, camphoroquinone has the unique characteristic, of which the light sensitivity is very dependent on the wavelengh of blue light. Camphoroquinone shows the most light absorption ability in the wavelengh range of 470nm. So most of clinically used light curing systems adopt this phenomenon as their polymerization mechanism. The most popular way of light curing system is standard 40-second curing. But the problem of standard curing technique shows the rapid increase of resin viscosity followed by the acceleration of polymerization and the limited resin flow, resulted in reduction of the physical property of restoration by retained stress.
The object of this study was to verify the effects of narrow-banded wavelengh on the microhardness of the esthetic restorative materials, a composite resin and a composer, using filters which have peak wave-lengh of 430nm,450nm,470nm, respectively.
The results were as follows :
1.All the experimental groups showed lower hardness value than the control group.
2.In DyractAP, the hardness value by wavelengh showed the same changing pattern on both upper and lower surfaces.
3.In DenFil, the hardness value by wavelengh showed different changing pattern on upper and lower surfaces.
4.The hardness ratio showed similar pattern to the hardness variation of lower surface, but there was no significant difference between measurement in 10 minutes and 3 days later, besides the increase of hardness value.

목차 (Table of Contents)

• Ⅰ.서론
• Ⅱ.실험재료 및 방법
• 1.실험재료
• 2.실험방법
• Ⅲ.실험결과
• Ⅳ.총괄 및 고안
• Ⅴ.결론