Shah K, Holloway J A, Denry I L
Removable Prosthodontics, Advanced Prosthodontics, Biomaterials, and Hospital Dentistry, UCLA School of Dentistry, Los Angeles, California 90095-1668, USA.
J Biomed Mater Res B Appl Biomater. 2008 Nov;87(2):329-37. doi: 10.1002/jbm.b.31107.
The purpose of this study was to investigate the effect of cerium and bismuth coloring salts solutions on the microstructure, color, flexural strength, and aging resistance of tetragonal zirconia for dental applications (3Y-TZP). Cylindrical blanks were sectioned into disks (2-mm thick, 25-mm in diameter) and colored by immersion in cerium acetate (CA), cerium chloride (CC), or bismuth chloride (BC) solutions at 1, 5, or 10 wt %. The density, elastic constants, and biaxial flexural strength were determined after sintering at 1350 degrees C. The crystalline phases were analyzed by X-ray diffraction before and after aging in autoclave for 10 h. The results showed that the mean density of the colored groups was comparable with that of the control group (6.072 +/- 0.008 g/cm(3)). XRD confirmed the presence of tetragonal zirconia with a slight increase in lattice parameters for the colored groups. A perceptible color difference was obtained for all groups (DeltaE* = 2.57 +/- 0.48 to 14.22 +/- 0.98), compared with the control. The mean grain size increased significantly for the groups colored with CC or CA at 10 wt %, compared with the control group (0.318 +/- 0.029 mm). The mean biaxial strength of CA1%, CA5%, and BC1% groups was not significantly different from that of the control group (1087.5 +/- 173.3 MPa). The flexural strength of all other groups decreased linearly with increasing concentration for both cerium salts (860.7 +/- 172 to 274.4 +/- 67.3 MPa). The resistance to low temperature degradation was not affected by the coloring process. Coloring with cerium or bismuth salts produced perceptible color differences even at the lowest concentrations. A decrease in flexural strength at the higher concentrations was attributed to an increase in open porosity.
本研究的目的是探究铈盐和铋盐着色溶液对牙科应用四方氧化锆（3Y-TZP）的微观结构、颜色、弯曲强度及抗老化性能的影响。将圆柱形坯料切成圆盘（厚2毫米，直径25毫米），并浸入1 wt%、5 wt%或10 wt%的醋酸铈（CA）、氯化铈（CC）或氯化铋（BC）溶液中进行着色。在1350℃烧结后测定密度、弹性常数和双轴弯曲强度。在高压釜中老化10小时前后，通过X射线衍射分析晶相。结果表明，着色组的平均密度与对照组相当（6.072±0.008 g/cm³）。X射线衍射证实了四方氧化锆的存在，且着色组的晶格参数略有增加。与对照组相比，所有组均获得了明显的色差（ΔE* = 2.57±0.48至14.22±0.98）。与对照组（0.318±0.029毫米）相比，10 wt%的CC或CA着色组的平均晶粒尺寸显著增大。CA1%、CA5%和BC1%组的平均双轴强度与对照组（1087.5±173.3 MPa）无显著差异。对于两种铈盐，所有其他组的弯曲强度均随浓度增加而线性下降（860.7±172至274.4±67.3 MPa）。着色过程未影响低温降解抗性。即使在最低浓度下，用铈盐或铋盐着色也会产生明显的色差。较高浓度下弯曲强度的降低归因于开孔率的增加。
