The University of Alabama at Birmingham, Birmingham, Alabama, USA.
J Prosthet Dent. 2012 May;107(5):300-8. doi: 10.1016/S0022-3913(12)60079-1.
When feldspathic porcelain (FP) laminate veneers are used to mask tooth discoloration that extends into the dentin, significant tooth reduction is needed to provide space for the opaque layer and optimize the bonding of the restoration.
The purpose of this study was to investigate the color effect of trial insertion paste (TP), composite resin abutment (CRA), and veneer regions on the optical properties of feldspathic porcelain (FP), yttria-stabilized zirconia (Y-TZP), and IPS e.max CAD HT (IEC) veneers.
A melamine tooth was prepared for a laminate veneer on a model, and a definitive cast was made. The definitive die was scanned by using the TurboDent System (TDS), then 30 CRA were machined and 10 veneers were fabricated for each ceramic material (FP, Y-TZP, IEC). The optical properties of different veneer materials, CRA (A(1), A(2), A(3)) and TP (bleach XL, opaque white, transparent, and yellow) were evaluated in the cervical, body, and incisal regions with a spectrophotometer. Results were analyzed by using 1-way ANOVA (.05).
The color difference for all the veneers was affected by TP and CRA colors in different regions. The mean values for the Y-TZP veneer color coordinates (L*: 74 ±0.34, a*: 0.09 ±0.20, and b*: 17.43 ±0.44) were significantly different (P<.001) from those of IEC veneers (L*: 70.15 ±0.23, a*: -0.69 ±0.073, and b*:11.48 ±0.30) and FP veneers (L*: 70.00 ±0.86, a*: - 0.28 ±0.203, and b*: 13.86 ±1.08). There was no difference between IEC for L* and FP. Significant difference was detected (P<.001) in color coordinates among the 3 veneer materials for a* and b*.
The TP color affected the color difference for all veneer materials except the Y-TZP, while there was no effect on the CRA color. The magnitude of color coordinates changed as a function of TP color and veneer material.
当长石质瓷（FP）贴面用于遮盖延伸至牙本质的牙齿变色时，需要大量的牙体预备以提供不透明层的空间，并优化修复体的粘结。
本研究的目的是研究试戴糊剂（TP）、复合树脂基底（CRA）和贴面区域对长石质瓷（FP）、氧化钇稳定氧化锆（Y-TZP）和 IPS e.max CAD HT（IEC）贴面光学性能的影响。
在模型上制备层压贴面的三聚氰胺牙，并制作最终模型。使用 TurboDent 系统（TDS）扫描最终模型，然后加工 30 个 CRA，并为每种陶瓷材料（FP、Y-TZP、IEC）制作 10 个贴面。使用分光光度计评估不同贴面材料、CRA（A1、A2、A3）和 TP（漂白 XL、不透明白、透明和黄色）在颈部、体部和切端区域的光学性能。结果采用单因素方差分析（.05）进行分析。
所有贴面的颜色差异均受 TP 和 CRA 颜色在不同区域的影响。Y-TZP 贴面颜色坐标的平均值（L*：74±0.34、a*：0.09±0.20、b*：17.43±0.44）与 IEC 贴面（L*：70.15±0.23、a*：-0.69±0.073、b*：11.48±0.30）和 FP 贴面（L*：70.00±0.86、a*：-0.28±0.203、b*：13.86±1.08）的差异有统计学意义（P<.001）。IEC 和 FP 之间的 L值无差异。a和 b*值在 3 种贴面材料之间有统计学差异（P<.001）。
TP 颜色除 Y-TZP 外，对所有贴面材料的颜色差异均有影响，而 CRA 颜色无影响。颜色坐标的大小随 TP 颜色和贴面材料的变化而变化。
