Lang R, Rosentritt M, Leibrock A, Behr M, Handel G
Department of Prosthetic Dentistry, University Clinics, Regensburg, Germany.
Br Dent J. 1998 Nov 14;185(9):468-71. doi: 10.1038/sj.bdj.4809839.
In an in vitro study to determine the colour stability of provisional restoration materials, the PMMA synthetics Trimm and Cronsin and the bis-acrylic composites Protemp Garant, Protemp Garant NF, Protemp II and Provipont DC were investigated.
The colour changes of the cylindrical untreated samples were measured in comparison with samples after 24 and 72 hours of artificial ageing in a Suntest CPS+ UV ageing device using the Minolta CM 3500d spectrophotometer according to the CIE-Lab* system.
Trimm (light), Cronsin (brown, yellow and universal), Provipont DC (yellow) and Protemp Garant NF (extra light) displayed the greatest discoloration with values > or = 4-21 delta E, where discoloration toward yellow could be discerned. The remaining materials showed lower luminance reflectance values of < or = 1-4 delta E, and therefore greater colour stability.
Because of their colour stability the materials Cronsin (grey), Protemp Garant (yellow), Protemp II (light), Protemp Garant NF (yellow, light and extra light) could also be used as long-term interim prosthetics.
在一项体外研究中，为确定临时修复材料的颜色稳定性，对聚甲基丙烯酸甲酯合成材料Trimm和Cronsin以及双丙烯酸类复合材料Protemp Garant、Protemp Garant NF、Protemp II和Provipont DC进行了研究。
使用美能达CM 3500d分光光度计，根据CIE-Lab*系统，在Suntest CPS+紫外线老化装置中对未经处理的圆柱形样品以及人工老化24小时和72小时后的样品进行颜色变化测量。
Trimm（浅色）、Cronsin（棕色、黄色和通用色）、Provipont DC（黄色）和Protemp Garant NF（超浅色）的变色最为明显，变色值≥4-21 ΔE，可以看出有向黄色变色的趋势。其余材料的亮度反射率值较低，≤1-4 ΔE，因此具有更高的颜色稳定性。
由于材料Cronsin（灰色）、Protemp Garant（黄色）、Protemp II（浅色）、Protemp Garant NF（黄色、浅色和超浅色）具有颜色稳定性，它们也可用于长期临时修复体。
