Sulaiman Taiseer A, Abdulmajeed Aous A, Donovan Terrence E, Vallittu Pekka K, Närhi Timo O, Lassila Lippo V
Department of Prosthetic Dentistry and Biomaterials Science, Institute of Dentistry.
Dent Mater J. 2015;34(5):605-10. doi: 10.4012/dmj.2015-054.
The effect of staining and vacuum sintering on optical properties and the bi-axial flexural strength of partially and fully stabilized monolithic zirconia (PSZ, FSZ) were evaluated. Disc-shaped specimens divided into three subgroups (n=15): non-stained, stained and non-stained with vacuum sintering. After staining and sintering, optical properties were evaluated using a reflection spectrophotometer and bi-axial flexural strength was tested using the piston-on-three balls technique. Statistical analysis was performed using multivariate analysis of variance (MANOVA) followed by post-hoc Tukey's tests (p<0.05). Staining decreased translucency parameter (TP) values of FSZ (p<0.05). Sintering under vacuum enhanced TP values for PSZ (p<0.05). Staining enhanced surface gloss for both types of zirconia (p<0.05). Staining increased bi-axial flexural strength of FSZ (p<0.05), while it decreased the strength of PSZ (p<0.05). Sintering under vacuum provided minimal benefits with either type of zirconia.
评估了染色和真空烧结对部分稳定及完全稳定的整体式氧化锆（PSZ、FSZ）光学性能和双轴弯曲强度的影响。将圆盘形试样分为三个亚组（n = 15）：未染色、染色以及真空烧结后未染色。染色和烧结后，使用反射分光光度计评估光学性能，并使用三球上活塞技术测试双轴弯曲强度。采用多变量方差分析（MANOVA），随后进行事后Tukey检验（p<0.05）进行统计分析。染色降低了FSZ的半透明参数（TP）值（p<0.05）。真空烧结提高了PSZ的TP值（p<0.05）。染色提高了两种类型氧化锆的表面光泽度（p<0.05）。染色增加了FSZ的双轴弯曲强度（p<0.05），而降低了PSZ的强度（p<0.05）。真空烧结对两种类型的氧化锆益处极小。
