Departamento de Biomateriais e Biologia Oral, Faculdade de Odontologia, Universidade de São Paulo, São Paulo, SP, Brazil.
Centro de Ciência e Tecnologia de Materiais, Instituto de Pesquisas Energéticas e Nucleares, São Paulo, SP, Brazil.
Dent Mater. 2018 Feb;34(2):238-245. doi: 10.1016/j.dental.2017.11.003. Epub 2017 Nov 26.
To investigate the effect of titania addition (0, 10 and 30mol%) on the microstructure, relative density, Young's modulus (E), Poisson's ratio (υ), mechanical properties (flexural strength, σ, and Weibull modulus, m) of a Y-TZP/TiO composite. The effect of the presence of a biomimetic coating on the microstructure and mechanical properties was also evaluated.
Y-TZP (3mol% of yttria) and Y-TZP/TiO composite (10 or 30mol% of titania) were synthesized by co-precipitation. The powders were pressed and sintered at 1400°C/2h. The surfaces, with and without biomimetic coating, were characterized by X-ray diffraction analysis and scanning electron microscopy. The relative density was measured by the Archimedes' principle. E and υ were measured by ultrasonic pulse-echo method. For the mechanical properties the specimens (n=30 for each group) were tested in a universal testing machine.
Titania addition increased the grain size of the composite and caused a significant decrease in the flexural strength (in MPa, control 815.4; T10 455.7 and T30 336.0), E (in GPa, control 213.4; T10 155.8 and T30 134.0) and relative density (control 99.0%; T10 94.4% and T30 96.3%) of the Y-TZP/TiO composite. The presence of 30% titania caused substantial increase in m and υ. Biomimetic coating did not affect the mechanical properties of the composite.
The Y-TZP/TiO composite coated with a layer of CaP has great potential to be used as implant material. Although addition of titania affected the properties of the composite, the application of a biomimetic coating did not jeopardize its reliability.
研究添加氧化钛（0、10 和 30mol%）对氧化钇稳定四方相氧化锆/二氧化钛（Y-TZP/TiO）复合材料的微观结构、相对密度、杨氏模量（E）、泊松比（υ）、力学性能（弯曲强度、σ 和威布尔模数、m）的影响。还评估了仿生涂层对微观结构和力学性能的影响。
采用共沉淀法合成 Y-TZP（3mol%氧化钇）和 Y-TZP/TiO 复合材料（10 或 30mol%氧化钛）。粉末在 1400°C/2h 下压制和烧结。通过 X 射线衍射分析和扫描电子显微镜对具有和不具有仿生涂层的表面进行了表征。通过阿基米德原理测量相对密度。通过超声波脉冲回波法测量 E 和 υ。对于力学性能，使用万能试验机对（每组 30 个）试样进行测试。
添加氧化钛会增加复合材料的晶粒尺寸，并显著降低复合材料的弯曲强度（以 MPa 计，对照组为 815.4；T10 为 455.7，T30 为 336.0）、E（以 GPa 计，对照组为 213.4；T10 为 155.8，T30 为 134.0）和相对密度（对照组为 99.0%；T10 为 94.4%，T30 为 96.3%）。添加 30%氧化钛会使 m 和 υ 显著增加。仿生涂层不会影响复合材料的力学性能。
涂有一层 CaP 的 Y-TZP/TiO 复合材料具有作为植入物材料的巨大潜力。尽管添加氧化钛会影响复合材料的性能，但应用仿生涂层并不会降低其可靠性。
