SITE LINK

광중합복합레진의 두께에 따른 투명도 차이가 수복물의 색상에 미치는 영향
TRANSLUCENCY OF LIGHT CURED COMPOSITE RESINS DEPENDS ON THICKNESS & ITS INFLUENCE ON COLOR OF RESTORATIONS

대한치과보존학회지 1999년 24권 4호 p.585 ~ 603

황인남, 이광원,

소속 상세정보

황인남 ( ) - 전북대학교 치과대학 치과보존학교실
이광원 ( ) - 전북대학교 치과대학 치과보존학교실

KMID : 0362319990240040585

Abstract

Esthetic availabilities used as an esthetic restorative materials can be determined by the optical coincidence among materials, enamel and dentin. Enamel is highly translucent. Thati s why esthetic materials need to correspond the close translucency of enamel. But the translucent materials are affected by the background color. So it should be predicted that the color of restorative materials depend on the any thickness and the spectral reflectance of the background on which they are placed.
The object of this investigation, under above hypothesis, was to determine and analyze how they affect the final color according to the thickness, translucency and background color(white, black and dentin) for three commercial light cured composite resins (Charisma, Spectrum TPH and Z100). And correlation was analyzed to find out the possibility of the prediction when using the certain background color and thickness of materials.
Followings are the result
1. The I shade of CHA showed the lowest contrast ratio(Co._(7)), while the B3 shade of Z100 showed the highest contrast ratio(p<0.05).
2. The value of L* and b* on the white and dentin background is increased with decreasing thickness. And there are significant relationships between increasing thickness and each value(R>0.85). But there is a little change of L* and b* value on the black background regardless of the thickness (p>0.05).
3. For the a* value, there was little difference in values as a function of thickness and changed irregularly regardless of thickness in all background.
4. The pattern of increasing value of L* and b* with decreasing thickness was similar to the group of white and dentin background. In both dentin one showed lesser change of value.
5. The values of L*a*b* measured on the different background with same thickness showed the recognizable color difference (Δ E*>2) when the thickness was below 2.6mm.
6. Contrast ratio was increased with increasing thickness with significant relationship (R>0.9).
7. Spectral reflectance of composite resins that calculated from Kubelka-Munk equation was showed little difference compared with observed value with decreasing thickness.