新型牙科氧化锆基复合材料的制备和力学性能的研究

Relies on the excellent biocompatibility, mechanical properties and aesthetic effects, zirconium are especially welcomed by the majority of dental patients.However, the lower toughness ,larger elastic modulus and high brittleness of zirconia limit its clinical application. This project focuses on solving these shortcomings of zirconia and improving its elastic modulus and toughness. In this paper,nano-alumina fibers are firstly prepared by meas of sol-gel method and electrospinning technology.Then alumina fibers-reinforced zirconia matrix composites were fabricated by microwave sintering process . The effects of process parameters on the densification and mechanical properties of the composites were studied. The fracture characteristics and biocompatibility of the new dental zirconia composites were also evaluated analyzed, which will lay the foundation for its clinical application.

凭借优异的生物相容性、力学性能和美学效果，氧化锆修复体受到广大牙科医患的青睐。然而氧化锆韧性低、弹性模量过大、脆性大等弱点限制了其临床推广应用。本项目着力解决氧化锆力学性能的缺陷，改善其弹性模量和韧性.首先采用溶胶-凝胶法和静电纺丝技术制备氧化铝纳米结构纤维，然后通过微波烧结工艺将氧化铝纤维引入钇稳定的氧化锆陶瓷中，制备新型氧化铝纤维增韧牙科氧化锆基复合材料。研究各工艺参数对复合材料的致密化及力学性能的影响,并分析了其断裂特征，评价新型氧化锆基复合材料的生物安全性能，为其临床应用奠定基础。

凭借优异的生物相容性、力学性能和美学效果，氧化锆修复体受到广大牙科医患的青睐。然而氧化锆韧性低、弹性模量过大、脆性大等弱点限制了其临床推广应用。本项目着力解决氧化锆力学性能的缺陷，改善其弹性模量和韧性。首先采用溶胶-凝胶法和静电纺丝技术制备氧化铝纳米结构纤维，然后通过微波烧结工艺将氧化铝纤维引入钇稳定的氧化锆陶瓷中，制备新型氧化铝纤维增韧牙科氧化锆基复合材料。研究各工艺参数对复合材料的致密化及力学性能的影响，并分析了其断裂特征，评价新型氧化锆基复合材料的生物安全性能，为其临床应用奠定基础。获得的氧化铝纤维增韧氧化锆陶瓷坯体的密度为5.36g/cm3,弯曲强度为669MPa，断裂韧性为8.3MPa·m1/2。参照六级毒性评级标准作毒性评定发现所获得的材料具有良好的生物相容性。