Li Jing, Zhang Xue-Hui, Cui Ben-Cang, Lin Yuan-Hua, Deng Xu-Liang, Li Ming, Nan Ce-Wen
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, PR China.
School & Hospital of Stomatology, Department of Geriatric Dentistry, Peking University, Beijing, 100081, PR China.
J Dent. 2017 Mar;58:60-66. doi: 10.1016/j.jdent.2017.01.008. Epub 2017 Jan 31.
The aim of this study was to evaluate the microstructure and mechanical behavior of polymer-infiltrated zirconia ceramics as a function of pre-sintering temperature (1000-1150°C).
Polymer-infiltrated zirconia ceramics were prepared by combining the porous zirconia networks and polymer through infiltration and polymerization. XRD was employed to determine phase structure. The microstructure and fracture mechanism were observed by SEM. Flexural strength and fracture toughness were measured by three-point bending method and single-edge-notched beam method, respectively. A nanoindentation system was employed to determine elastic modulus and hardness.
Different porosities and polymer contents can be obtained by tuning the pre-sintered temperature of zirconia ceramic precursors. Zirconia network porosity varies from 46.3% to 34.7% and the relevant polymer content ranges from 18.4wt.% to 12.3wt.% when the pre-sintered temperature is set from 1000°C to 1150°C. The flexural strength, fracture toughness, hardness, and elastic modulus values of the specimen pre-sintered at 1150°C are 240.9MPa, 3.69MPam, 3.1GPa, and 58.8GPa, respectively.
The pre-sintering temperature has a significant effect on the microstructure and mechanical properties of polymer-infiltrated zirconia ceramics and the optimal pre-sintering temperature is 1150°C.
Specimen pre-sintered at 1150°C shows tooth-like mechanical properties, suggesting a promising restorative material in dental clinic. Moreover, the synthesis process is simple and can be easily performed in a prosthesis laboratory.
本研究旨在评估聚合物渗透氧化锆陶瓷的微观结构和力学行为与预烧结温度（1000 - 1150°C）之间的关系。
通过渗透和聚合将多孔氧化锆网络与聚合物相结合来制备聚合物渗透氧化锆陶瓷。采用X射线衍射仪（XRD）确定相结构。通过扫描电子显微镜（SEM）观察微观结构和断裂机制。分别采用三点弯曲法和单边切口梁法测量弯曲强度和断裂韧性。使用纳米压痕系统测定弹性模量和硬度。
通过调整氧化锆陶瓷前驱体的预烧结温度，可以获得不同的孔隙率和聚合物含量。当预烧结温度从1000°C设定到1150°C时，氧化锆网络孔隙率从46.3%变化到34.7%，相关聚合物含量从18.4wt.%变化到12.3wt.%。在1150°C预烧结的试样的弯曲强度、断裂韧性、硬度和弹性模量值分别为240.9MPa、3.69MPam、3.1GPa和58.8GPa。
预烧结温度对聚合物渗透氧化锆陶瓷的微观结构和力学性能有显著影响，最佳预烧结温度为1150°C。
在1150°C预烧结的试样表现出类似牙齿的力学性能，表明其在牙科临床中是一种有前景的修复材料。此外，合成过程简单，可在义齿实验室轻松进行。
