Razzoog M E, Lang B R, Russell M M, May K B
Department of Prosthodontics, University of Michigan School of Dentistry, Ann Arbor.
J Prosthet Dent. 1994 Nov;72(5):453-6. doi: 10.1016/0022-3913(94)90113-9.
Simulation of naturally appearing enamel in fixed prosthodontics is best achieved with porcelain. This study investigated the color stability of two different dental porcelains, Ceramco and Procera, after they were exposed to 900 hours of accelerated aging. Twenty titanium plates provided the substrate to which the Procera porcelain samples in shades A3, A3.5, C3, and D3 were fired, five in each shade. An equal number of metal-ceramic alloy (Olympia) plates were cast to the same dimensions to form the 20 substrates to which Ceramco porcelain was fired. The four shades of porcelain were again added to each of the samples. Commission International de l'Eclairage L a b readings were recorded with a Minolta Chroma Meter II before and after exposure to 900 hours of accelerated aging simulation. After the aging process the color differences between the pretest and posttest condition were calculated. Although statistical comparisons demonstrated a difference in color change (p < or = 0.05) between Ceramco and Procera porcelain in three of the shades tested, critical remarks of color refer to both types having "slight" color change. In terms of color stability, neither porcelain had "noticeable" changes after 900 hours of accelerated aging.
在固定修复学中，模拟天然牙釉质最好使用瓷材料。本研究调查了两种不同牙科瓷材料（Ceramco和Procera）在经过900小时加速老化后的颜色稳定性。20块钛板作为基底，将色号为A3、A3.5、C3和D3的Procera瓷样本烧制在上面，每个色号5个样本。铸造数量相等的金属陶瓷合金（Olympia）板，使其尺寸相同，形成20个基底，在上面烧制Ceramco瓷。再次将四种色号的瓷添加到每个样本上。在进行900小时加速老化模拟前后，使用美能达色差仪II记录国际照明委员会（CIELab）读数。老化过程后，计算测试前和测试后条件之间的颜色差异。尽管统计比较表明，在测试的三种色号中，Ceramco和Procera瓷在颜色变化上存在差异（p≤0.05），但对颜色的关键评价是两种类型都有“轻微”的颜色变化。就颜色稳定性而言，经过900小时加速老化后，两种瓷都没有“明显”变化。
