State Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, 14#, Sect. 3, Renming South Road, Chengdu 610041, China.
J Mater Sci Mater Med. 2011 Nov;22(11):2429-35. doi: 10.1007/s10856-011-4438-9. Epub 2011 Sep 16.
The aim of this study was to evaluate the effects of sintering temperature and particle size on the translucency of yttrium stabilized tetragonal zirconia polycrystals (Y-TZP) dental ceramic. Eighty disc-shaped and cylindrical specimens were fabricated from zirconia powers of particle size 40 and 90 nm. These specimens were sintered densely at the final sintering temperature 1350, 1400, 1450 and 1500°C, respectively. The visible light transmittance, sintered density and microstructure of the sintered block were examined. The results showed that the sintered densities and transmittances increased with the temperature from 1,350 to 1,500°C. Y-TZP could gain nearly full density and about 17-18% transmittance at the final sintering temperature of 1,450-1,500°C. The 40-nm powders had higher sintered density and transmittance than the 90-nm. The translucency of Y-TZP dental ceramic could be improved by controlling the final sintering temperature and primary particle size.
本研究旨在评估烧结温度和粒径对钇稳定四方氧化锆多晶（Y-TZP）牙科陶瓷透光性的影响。采用粒径为 40nm 和 90nm 的氧化锆粉末制备了 80 个圆盘状和圆柱形试样。这些试样分别在最终烧结温度为 1350、1400、1450 和 1500°C 下致密烧结。对烧结体的可见光透过率、烧结密度和微观结构进行了研究。结果表明，随着温度从 1350°C 升高到 1500°C，烧结密度和透光率都有所提高。Y-TZP 在最终烧结温度为 1450-1500°C 时可获得近完全密度和 17-18%的透光率。40nm 粉末的烧结密度和透光率均高于 90nm 粉末。通过控制最终烧结温度和初级粒径，可以提高 Y-TZP 牙科陶瓷的透光性。
