摘要
研究评估了水基电泳沉积作为口腔纳米氧化锆全瓷修复体成型方式的可能性.试验通过配置固含量为85wt%的低粘度水基悬浮液,在齿科专用石膏上直接以电泳沉积的方式成型出纳米氧化锆陶瓷预成体,并研究了其结构和性能特点.结果显示:水基电泳沉积成型的方式可以成型出结构非常均一的纳米氧化锆预成体,其表面光滑,外形与石膏基底外形一致,在微观结构上与已商品化的齿科CerconCAD/CAM氧化锆预成瓷块相比,结构更加致密、均匀,且未见明显气泡、裂缝等缺陷;要达到>99.9%TD,水基电泳沉积成型的纳米氧化锆3Y-TZP所需的烧结温度为1320℃,低于常规的干压成型工艺,力学性能与Cercon氧化锆全瓷修复材料相近,能够满足临床需要.
The feasibility of using aqueous EPD （electrophoretic deposition） as a full ceramic crown forming tech- nique was evaluated. The aqueous suspensions, with high solid content of 85wt % ,were obtained as the EPD starting materials. High density green-bodies successfully directly formed on dental gypsum model material. It appears a good marginal quality to original model with a good surface and without visible cracks. The microstructure of green-body made by aqueous EPD was studied by using field emission scanning electron microscope. Pore Size of green-body was analyzed by mercury porosirneter. The structure of the sintered ceramic prepared by EPD on different temperature was compared with both dry pressing method and commercial Cercon dental zirconia system. The result suggests that homogeneous nano-zirconia 3Y-TZP green bocly could be directly near-shape manufactured on gypsum model by the aqueous EPD technique. The density of nano-zirconia 3Y-TZP green body prepared by EPD was more uniform than both prepared by dry pressing and Cercon dental zirconia system,most apertures got a diameter less than 45nm,and the aperture of 3Y-TZP green body prepared by EPD showed a obvious single peak distribution, which got a radius less than 18nm. After sintering,high density （100~ TD） nano zirconia 3Y-TZP with uniform microstrueture,free of bubbles and cracks,could be manufactured by aqueous EPD,the average grain size and sintering temperature were all lower than that of formed by means of traditional dry pressing method. Fracture toughness of nano-zirconia 3Y-TZP produced by aqueous EPD was higher than the normal biting force range,so it can satisfied the clinic requirements. Aqueous EPD on gypsum model can be an effective way to manufacture full ceramic dental crown.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第2期153-161,共9页
Journal of Nanjing University（Natural Science）
关键词
氧化锆
电泳沉积
齿科
全瓷修复体
zirconia, electrophoretic deposition, dental, full ceramic restoration
