Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan.
Dent Mater J. 2012 Feb 3;31(1):106-12. doi: 10.4012/dmj.2011-048. Epub 2012 Jan 21.
The aim of this study was to determine the machinability of new silica-doped Y-TZP by CAD/CAM and the resistance to low temperature degradation of the milled sample by comparing with a commercial HIP type Y-TZP material. The copings could be milled from silica-doped Y-TZP blocks without chipping, and there was no significant difference between the two types of Y-TZP materials in either the marginal or the inner gap between the abutment and the coping. After aging, the monoclinic content in the commercial Y-TZP copings increased from 25% before testing to 65%, while that of silica-doped Y-TZP copings slightly increased from 23% to 30%. The silica-doped Y-TZP copings did not have any significant difference in fracture load in a comparison between the control group and the aging group, while the commercial Y-TZP copings had a significantly lower fracture load for the aging group than for the control group.
本研究旨在通过与商业 HIP 型 Y-TZP 材料进行比较，确定新型掺硅 Y-TZP 的可加工性以及研磨样品对低温降解的抵抗力。硅掺杂 Y-TZP 块可以铣削成牙冠，而两种 Y-TZP 材料在基牙和牙冠之间的边缘或内部间隙方面没有显著差异。老化后，商用 Y-TZP 牙冠的单斜相含量从测试前的 25%增加到 65%，而掺硅 Y-TZP 牙冠的含量则从 23%略有增加到 30%。在对照组和老化组之间的比较中，掺硅 Y-TZP 牙冠的断裂载荷没有显著差异，而商用 Y-TZP 牙冠的老化组的断裂载荷明显低于对照组。
