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[Study on the infinity optical thickness of light-cured composite resins and attached shade guides]
Chun-ming Xia1, Chang-xi Shi, Ji-hua Chen
1Department of Prosthet, Stomatological Hospital, Fourth Military Medical University, Xi'an 710032, China. xia889325@163.net
Objective:
This study compared the opaque characteristics of light-cured composite resins and attached shade guides.
Methods:
Three kinds of light-cured composite resins and attached shads guides were used. A plastic mold (10mm in diameter and 4mm in height) was used to prepare disk specimens. Color was measured by CIE L*a*b* relative to CIE source against a white and a black background, using a colorimeter. Color change (DeltaE)was calculated as DeltaE=[(DeltaL*)(2)+(Deltaa*)(2)+(Deltab*)(2)](1/2). The heights of composite resins were recorded as DeltaE is approximately 1.5. The infinity optical thickness of composite resins when delta E*=1.5 was calculated by regression formulation.
Results:
There was significant difference in color difference and the infinity optical thickness among materials and shades. The infinity optical thickness gradual decreased in the same shade mark from 1 to 4, and from A to D the results was not simple.
Conclusion:
There was significant difference in the infinity optical thickness between the attached shade guides and the resins materials. Composite resins contain micro-filler were inferior in infinity optical thickness.
