Beatty M W, Mahanna G K, Dick K, Jia W
Department of Adult Restorative Dentisitry, University of Nebraska Medical Center, College of Dentistry, Lincoln, USA.
J Prosthet Dent. 1995 Nov;74(5):493-8. doi: 10.1016/s0022-3913(05)80351-8.
Five dry pigments and one maxillofacial elastomer were evaluated for color changes (delta E) resulting from prolonged exposure to two types of ultraviolet light. The elastomer, pigments, and pigmented elastomers were subjected to each ultraviolet light source for 400, 600, and 1800 hours, and delta E color shifts were determined. The unpigmented elastomer underwent minimally perceptible color change after 600 hours of exposure to both types of ultraviolet light. Two pigments underwent substantial color change after 400 hours, whereas the remaining three pigments remained color stable after 1800 hours. It was concluded that for the materials tested, early color changes in a prosthesis may be the result of degradation of certain ultraviolet light-susceptible pigments, whereas longer term color shifts may be caused by color changes within the elastomer.
对五种干性颜料和一种颌面弹性体进行了评估，以研究长时间暴露于两种紫外线后产生的颜色变化（ΔE）。将弹性体、颜料和含颜料的弹性体分别置于每种紫外线光源下照射400、600和1800小时，并测定ΔE颜色变化。未着色的弹性体在暴露于两种紫外线600小时后，颜色变化极小，几乎难以察觉。两种颜料在照射400小时后发生了显著的颜色变化，而其余三种颜料在照射1800小时后仍保持颜色稳定。得出的结论是，对于所测试的材料，假体早期的颜色变化可能是某些易受紫外线影响的颜料降解的结果，而长期的颜色变化可能是弹性体内颜色变化引起的。
