College of Stomatology, Kunming Medical University, Kunming 650500, China.
Dept. of Prosthodontics, Affiliated Stomatological Hospital of Kunming Medical University, Kunming 650100, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2021 Jun 1;39(3):341-346. doi: 10.7518/hxkq.2021.03.015.
To analyze the chromatic properties and translucency of porcelain veneers made from different ceramic materials against the background of tetracycline-stained teeth.
Porcelain specimens (A1, A3, B2, B4) measuring 0.50 mm in thickness were prepared by heat-press casting and layering. The L*, a*, and b* values of the specimens against simulated tetracycline tooth and black-and-white backgrounds were measured by a spectrophotometer, and color differences ΔE1 between specimens on simulated tetracycline backgrounds and the backgrounds themselves and ΔE2 between specimens on simulated tetracycline backgrounds and the white background were calculated. The translucent parameter (TP) was also evaluated.
The ΔE1 of feldspathic specimens (IPS d.SIGN) with the opaque layer was significantly greater than that of glass ceramic specimens (IPS e.max Press LT), and the ΔE1 of group B4 was consistently greater than those of the other color groups (<0.05). The ΔE2 values of all feldspathic specimens with the opaque layer were less than 1.25, and the ΔE2 values of the glass ceramic specimens were greater than 2.23. However, no significant difference was observed among the different color groups (>0.05). The TP values of feldspathic specimens with the opaque layer were significantly lower than those of glass ceramic specimens(<0.05), but no significant difference was observed among different color groups (>0.05).
When changing the color of tetracycline-stained teeth, 0.50 mm-thick IPS d.SIGN feldspathic veneers with an opaque layer provide better chromatic properties than IPS e.max Press LT glass ceramic veneers. However, the translucency of feldspathic veneers is generally poorer than that of glass ceramic veneers.
分析不同陶瓷材料制作的瓷贴面在四环素染色牙背景下的颜色特性和半透明度。
采用热压铸法和分层法制备厚度为 0.50mm 的 A1、A3、B2、B4 瓷试件。用分光光度计测量试件在模拟四环素牙和黑白背景下的 L*、a*、b*值，并计算试件在模拟四环素背景下与背景本身的色差值ΔE1 和试件在模拟四环素背景下与白色背景的色差值ΔE2。还评估了半透明度参数（TP）。
具有不透明层的长石质试件（IPS d.SIGN）的ΔE1显著大于玻璃陶瓷试件（IPS e.max Press LT），B4 组的ΔE1始终大于其他颜色组（<0.05）。所有具有不透明层的长石质试件的ΔE2 值均小于 1.25，而玻璃陶瓷试件的ΔE2 值大于 2.23。但是，不同颜色组之间没有观察到显著差异（>0.05）。具有不透明层的长石质试件的 TP 值明显低于玻璃陶瓷试件（<0.05），但不同颜色组之间没有观察到显著差异（>0.05）。
在改变四环素染色牙的颜色时，0.50mm 厚的具有不透明层的 IPS d.SIGN 长石质贴面比 IPS e.max Press LT 玻璃陶瓷贴面提供更好的颜色特性。然而，长石质贴面的半透明度通常比玻璃陶瓷贴面差。
