采用有限元法分析了钛/瓷、钛/ZrO2/瓷连接冷却过程中界面残余应力形成的大小和分布特征.结果表明,钛/瓷试样在结合界面处存在较大的残余应力.在平行于界面的方向上,陶瓷表面受拉应力的作用,易导致表面裂纹的产生.钛/瓷界面的边缘处存在较大的应力集中,尤其是结合界面位于Z向棱边的顶角处,应力集中较为明显,易导致瓷崩和瓷裂.ZrO2中间层可抑制钛表面过度氧化,缓和钛/瓷界面应力集中,提高钛/瓷结合强度,降低陶瓷层裂纹倾向.
参考文献
| [1] | 雷亚超;魏治统;杜传诗 等.金属与陶瓷热膨胀差对金属烤瓷冠热稳定性的影响[J].中华口腔医学杂志,1991,26(06):329-332. |
| [2] | LENZ J;KESSEL S .Thermal stresses in metal-ceramic specimens for the ISO crack initiation test(three-point flexure bond test)[J].Dental Materials,1998,14(04):277-280. |
| [3] | CASCONE P J;NABATRAN D .Determination of thermal expansion compatibility limits for porcelain-metal systems[J].Journal of Dental Research,1982,61(09):330-333. |
| [4] | Toparli M;Sasaki S .Finite element analysis of the temperature and thermal stress in a postrestored tooth.[J].Journal of oral rehabilitation,2003(9):921-926. |
| [5] | 辛海涛,马轩祥,李玉龙,徐绯,郭伟国.金-瓷修复体粘弹性残余应力的有限元分析[J].华西口腔医学杂志,2004(06):463-465,473. |
| [6] | 李臻熙.Al2O3-Ti系梯度功能材料残余热应力有限元分析[J].材料工程,1998(03):11. |
| [7] | PROOS K A;SWAIN M V;IRONSIDE J et al.Finite element analysis studies of a metal-ceramic crown on a first premolar tooth[J].International Journal of Prosthodontics,2002,15(06):521-527. |
| [8] | Manoel G. Troia Jr.;Guilherme E.P. Henriques;Mauro A. A. Nobilo;Marcelo F. Mesquita .The effect of thermal cycling on the bond strength of low-fusing porcelain to commercially pure titanium and titanium-aluminium-vanadium alloy[J].Dental materials,2003(8):790-796. |
| [9] | Marklund S;Bergman B;Hedlund SO;Nilson H .An intraindividual clinical comparison of two metal-ceramic systems: a 5-year prospective study.[J].The International journal of prosthodontics,2003(1):70-73. |
| [10] | Al Hussaini I;Al Wazzan KA .Effect of surface treatment on bond strength of low-fusing porcelain to commercially pure titanium.[J].The Journal of Prosthetic Dentistry,2005(4):350-356. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%