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KMID : 0988720090250010013
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Journal of the Korean Academy of Stomatognathic Function and occlusion
2009 Volume.25 No. 1 p.13 ~ p.22
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A Spectrophotometric Study on Color Differences between Various Light-Cured Composite Resins and Shade Guides
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Lim Kyung-Min
Song Kwang-Yeob
Lee Min-Ho
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Abstract
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The composite resin, due to its esthetic quality, is considered the material of choice for restoration of anterior teeth. To get a satisfactory result in the composite resin restorations, it is necessary to choose right shade. At present, most of the commercial composite resins are based on the Vita Lumin shade guides or shade guides that are provided by their company, but color differences among them might be expected even using the same shade in various materials. This study is to measure color differences between various light-cured composite resins and shade guides and to provide the clinicians with information which may aid in improved color match of esthetic restoration. Four kinds of light-cured composite resins (Gradia Direct (GD), Z250 (Z250), Clearfil AP-X (AP-X), Esthet?X (E?X)) and shade guides with A2 and A3 shade were used. Three specimens of each material and one specimen of each shade guide were made. Each composite resin was filled into the Teflon mold (1.35 mm depth, 8 mm diameter), followed by compression, polymerization and polishing with wet sandpaper. Shade guides were grinded with polishing stones and rubber points to a thickness of approximately 1.35 mm. Color characteristics were performed with a spectrophotometer(color i5, GretagMacbeth, USA). A computer-controlled spectrophotometer was used to determine CIELAB coordinates (L*, a*, b*) of each specimen and shade guide. The CIELAB measurements made it possible to evaluate the amount of the color difference values (?E*ab) between composite resins and shade guides. CIE standard D65 was used as the light source. The results were as follows : 1. Among the L*, a*, b* values of most of 4 kinds of composite resin specimens which are produced by same shade, there were significant differences(p<0.05). 2. Among all 4 kinds of composite resin specimens which are produced by same shade, there were color differences that is perceptible to human eye(?E*>3.3). 3. Between most of composite resin specimens investigated and their corresponding shade guides, there were color differences that is perceptible to human eye(?E*>3.3). 4. In the clinical environment, it is recommended that custom shade guides be made from resin material itself for better color matching. Shade guides supplied by manufacturers or Vita Lumin shade guide may not provide clinicians a accurate standard in matching color of composite resins, and there are perceptible color differences in most of products. Therefore, it is recommended that custom shade guides be made from resin material itself and used for better color matching.
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KEYWORD
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Composite resin, Shade guides, Spectrophotometer, Color difference, Custom shade guide
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