Department of Prosthodontics, Dental School, University of Athens, Athens, Greece.
Gerodontology. 2012 Jun;29(2):e239-45. doi: 10.1111/j.1741-2358.2011.00458.x. Epub 2011 Mar 10.
The purpose of this study was to assess the colour stability of seven visible light-cured (VLC) hard and soft denture liners by an in vitro accelerated ageing test and compare them with two autopolymerised hard and soft liners.
Ten specimens of each material were fabricated. The initial colour was measured with a tri-stimulus colorimeter. One set of five specimens was placed in distilled water at 37°C in the dark for 15 days, while the remaining were subjected to UV/visible light-accelerated ageing initially for 24 h and then for 144 h. Colour change (ΔΕ) was calculated. Data were statistically analysed by anova, Tukey and t-tests at α = 0.05.
All the liners showed clinically acceptable colour change (ΔΕ ≤ 6.8) in distilled water. The colour changes after ageing for Triad DuaLine, Lightdon U, Ufi Gel H and Light Liner Hard were clinically unacceptable (ΔΕ ≥ 6.8), whereas LightLiner Soft, Astron LC Soft, Triad Resiline and Flexacryl Soft presented slighter and clinically acceptable colour change (ΔΕ ≤ 6.8).
Accelerated ageing affected significantly the colour stability of all denture liners tested except Astron LC Soft. Soft VLC denture liners were more colour-stable than hard VLC liners.
本研究通过体外加速老化试验评估七种可见光固化（VLC）硬、软义齿衬垫的颜色稳定性，并将其与两种自聚物硬、软衬垫进行比较。
每种材料制作 10 个样本。用三刺激色度计测量初始颜色。一组 5 个样本置于 37°C 蒸馏水中避光 15 天，其余样本先进行 UV/可见光加速老化 24 h，然后再进行 144 h。计算颜色变化（ΔΕ）。数据采用方差分析、Tukey 和 t 检验进行统计学分析，α=0.05。
所有衬垫在蒸馏水中均显示出临床可接受的颜色变化（ΔΕ≤6.8）。老化后 Triad DuaLine、Lightdon U、Ufi Gel H 和 Light Liner Hard 的颜色变化不可接受（ΔΕ≥6.8），而 LightLiner Soft、Astron LC Soft、Triad Resiline 和 Flexacryl Soft 则呈现出较小且临床可接受的颜色变化（ΔΕ≤6.8）。
加速老化显著影响所有测试义齿衬垫的颜色稳定性，除 Astron LC Soft 外。软 VLC 义齿衬垫比硬 VLC 衬垫更稳定。
