目的:比较总结两种可加工长石瓷的性能及组织,为牙科可加工长石瓷的制备提供新的选择.方法:采用放电等离子烧结技术(简称SPS)在温度1120℃,压力30MPa,升温速度100℃/min制备出可加工陶瓷块,与德国VITA公司的VITA MARKⅡ进行比较;运用直接压痕法测量两种材料的断裂韧性、硬度、弹性模量,分析两种陶瓷的晶相成分及显微组织.结果:SPS烧结得到的长石瓷断裂韧性能达1.44～1.53MPa1/2,高于VITA MARK Ⅱ(1.2MPa1/2);硬度为622～644kgf/mm2,弹性模量为60～66kgf/mm2,与VITA MARKⅡ(645kgf/mm2,63 kgf/mm2)相当;经XRD及金相分析表明,两种可加工陶瓷的晶相成分不同,大小也不同.结论:SPS技术制备的牙科可加工长石陶瓷材料,硬度适于医用,断裂韧性优于VITAMARK Ⅱ产品,能够达到医用要求.
参考文献
| [1] | Kelly J R;Nishimura I;Campbell S D .[J].Journal of Prosthetic Dentistry,1996,75(01):18-32. |
| [2] | Malament KA;Socransky SS .Survival of Dicor glass-ceramic dental restorations over 14 years. Part II: effect of thickness of Dicor material and design of tooth preparation.[J].The Journal of Prosthetic Dentistry,1999(6):662-667. |
| [3] | 骆小平,赵云凤.牙科全瓷冠修复的研究进展[J].中华口腔医学杂志,2000(02):158-160. |
| [4] | Marshall D B;Noma T;Evans A G .[J].Journal of the American Ceramic Society,1982,65:C175-C176. |
| [5] | 龚江宏.陶瓷材料断裂力学[M].北京:清华大学出版社,2001 |
| [6] | Sindel J.;Grellner F.;Dierken C.;Greil P.;Petschelt A. .Evaluation of subsurface damage in CAD/CAM machined dental ceramics[J].Journal of Materials Science. Materials in Medicine,1998(5):291-295. |
| [7] | Albakry M;Guazzato M;Swain MV .Fracture toughness and hardness evaluation of three pressable all-ceramic dental materials.[J].Journal of dentistry,2003(3):181-188. |
| [8] | Grellner F.;Greil P.;Sindel J.;Petschelt A.;Hoscheler S. .RESIDUAL STRESS MEASUREMENTS OF COMPUTER AIDED DESIGN/COMPUTER AIDED MANUFACTURING (CAD CAM) MACHINED DENTAL CERAMICS[J].Journal of Materials Science,1997(23):6235-6242. |
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