Department of Stomatology, School of Dentistry, University of Granada, Campus Universitario de Cartuja, Colegio Máximo s/n, 18071, Granada, Spain.
J Dent. 2012 Dec;40 Suppl 2:e34-40. doi: 10.1016/j.jdent.2012.08.018. Epub 2012 Sep 4.
Evaluate color and translucency of both non-colored and colored zirconia ceramics and compare them with corresponding properties of human dentine.
0.5mm thick samples of human (MSHD) and bovine (MSBD) dentine were obtained from 5 extracted human anterior maxillary teeth and 5 bovine incisors, respectively. The zirconia systems evaluated (0.5mm samples) were: (1) IPS e.max(®) ZirCAD sintered samples: (a) regular (ZC1); (b) colored - coloring liquid CL2 (ZC2); (2) LAVA™ Zirconia sintered samples: (a) regular (LV1); (b) colored - coloring liquid FS3 (LV2). Translucency parameter (TP) and ΔE(ab)(*) and ΔE(00) color differences (with respect to the MSHD) were calculated. Spectral reflectance curves were compared using the VAF coefficient.
Reflectance spectral behaviour of MSBD and MSHD were similar (VAF=99.3%). All zirconia samples showed higher spectral reflectance values than the MSHD. Lightness values obtained for all zirconia ceramics (especially LV) were higher than MSHD and MSBD. The range of color differences, with respect to MSHD, was 6.9-20.5 for ΔE(ab)(*) and 4.9-15.6 for ΔE(00). Colored samples showed lower color differences with respect to MSHD. The highest TP values were found for IPS e.max(®) ZirCAD system and the lowest for LAVA™ Zirconia system. In terms of translucency, MSHD, MSBD and zirconia ceramics showed no statistically significant differences.
In terms of translucency, the studied zirconia systems could satisfactorily replace the human dentine within a dental restoration but, in order to produce a clinically acceptable match, it is necessary to carefully adjust the color of these systems.
评估非着色和着色氧化锆陶瓷的颜色和半透明度，并将其与相应的人牙本质特性进行比较。
从 5 颗上颌前牙和 5 颗牛切牙中分别获得 0.5mm 厚的人牙本质（MSHD）和牛牙本质（MSBD）样本。评估的氧化锆系统（0.5mm 样本）为：（1）IPS e.max（®）ZirCAD 烧结样本：（a）常规（ZC1）；（b）着色-着色液 CL2（ZC2）；（2）LAVA™氧化锆烧结样本：（a）常规（LV1）；（b）着色-着色液 FS3（LV2）。计算半透明度参数（TP）和 ΔE（ab）（*）和 ΔE（00）颜色差异（相对于 MSHD）。使用 VAF 系数比较光谱反射率曲线。
MSBD 和 MSHD 的反射光谱行为相似（VAF=99.3%）。所有氧化锆样本的光谱反射率值均高于 MSHD。所有氧化锆陶瓷（尤其是 LV）的明度值均高于 MSHD 和 MSBD。相对于 MSHD，所有氧化锆陶瓷的颜色差异范围为 6.9-20.5 为 ΔE（ab）（*）和 4.9-15.6 为 ΔE（00）。着色样本相对于 MSHD 显示出较低的颜色差异。IPS e.max（®）ZirCAD 系统的 TP 值最高，LAVA™氧化锆系统的 TP 值最低。在半透明度方面，MSHD、MSBD 和氧化锆陶瓷之间没有统计学上的显著差异。
就半透明度而言，研究中的氧化锆系统可以在牙修复体中令人满意地替代人牙本质，但为了达到临床可接受的匹配，需要仔细调整这些系统的颜色。
