Department of Dental Materials and Prosthodontics, Ribeirao Preto Dental School, São Paulo University, Ribeirao Preto, SP, Brazil.
Gerodontology. 2012 Jun;29(2):e312-7. doi: 10.1111/j.1741-2358.2011.00473.x. Epub 2011 Apr 1.
To evaluate the colour stability of paints used for ocular prosthesis iris painting submitted for accelerated artificial ageing (AAA).
Forty specimens of acrylic resin for sclera (16 × 2 mm) were made and separated into eight groups (n = 10) according to the type of paint (gouache, GP; oil, OP; acrylic AP; and composite resin for characterisation, CR) and the colours used (blue/brown). After drying (72 h), a new layer of colourless acrylic resin was applied and the initial colour readout was performed (Spectrophotometer PCB 6807). New colour readouts were performed after AAA, and ΔE was calculated.
Statistical analysis (two-way anova-Bonferroni, p < 0.05) demonstrated that the brown colour showed lower ΔE means in comparison with the blue colour, with statistically significant difference for AP only. Blue colour showed no statistically significant difference with regard to the type of paint used. Brown AP showed lower ΔE than the other groups, with significant difference for OP and GP. GP showed greater alteration in ΔE for the brown colour, being statistically similar only to OP.
Only the AP group for brown pigment shows clinically acceptable values for colour stability after AAA.
评估用于眼部义眼虹膜绘画的颜料在加速人工老化（AAA）后的颜色稳定性。
制作了 40 个巩膜丙烯酸树脂样本（16×2mm），并根据颜料类型（蛋彩画颜料、GP；油画颜料、OP；丙烯颜料、AP；和特征复合树脂、CR）和使用的颜色（蓝色/棕色）将其分为 8 组（n=10）。干燥（72h）后，涂上新的无色丙烯酸树脂，并进行初始颜色读数（分光光度计 PCB 6807）。AAA 后进行新的颜色读数，并计算ΔE。
统计分析（双向方差分析- Bonferroni，p<0.05）表明，棕色比蓝色的ΔE 均值更低，仅在 AP 中具有统计学差异。蓝色与使用的颜料类型无统计学差异。棕色 AP 的ΔE 低于其他组，与 OP 和 GP 有显著差异。GP 对棕色的 ΔE 变化更大，仅与 OP 统计学上相似。
只有棕色颜料的 AP 组在 AAA 后显示出对颜色稳定性具有临床可接受值。
