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- Title
Does the thickness of universal-shade composites affect the ability to reflect the color of background dentin?
- Authors
Ako YAMASHITA; Shun KOBAYASHI; Kiyoka FURUSAWA; Antonin TICHY; Rena OGURO; Keiichi HOSAKA; Yasushi SHIMADA; Masatoshi NAKAJIMA
- Abstract
The recently introduced resin composites with a universal shade are claimed to match any tooth color. In this study, it was examined how composite thickness affects the color adjustment of conventional and universal-shade composites to background dentin. Thirty sound human central incisors of various shade were used, and color differences between their intact labial surfaces, exposed dentin surfaces and composite restorations (thickness 1-3 mm) were evaluated. In addition, the translucency, light transmission characteristics, and spectral reflectance of the composites were measured. The results showed that universal-shade composites outperformed conventional composites of A2 shade in the adjustment of hue and chroma (p<0.05) but not in lightness (p>0.05). The color adjustment potential of all composites significantly decreased as their thickness increased (p<0.05). The effect of thickness on Omnichroma and Omnichroma Flow was less marked, presumably because of their higher translucency (p<0.05) and structural coloration which induces light reflectance in the yellow-to-red range.
- Subjects
DENTIN; LIGHT transmission; SPECTRAL reflectance; STRUCTURAL colors; COLOR
- Publication
Dental Materials Journal, 2023, Vol 42, Issue 2, p255
- ISSN
0287-4547
- Publication type
Article
- DOI
10.4012/dmj.2022-197