Department of Oral and Maxillofacial Prosthodontics and Oral Implantology, Institute of Health Biosciences, The University of Tokushima, Tokushima, Japan.
J Biomed Mater Res B Appl Biomater. 2013 Aug;101(6):1090-4. doi: 10.1002/jbm.b.32919. Epub 2013 Apr 4.
Tailor-made porous titanium implants show great promise in both orthopedic and dental applications. However, traditional powder metallurgical processes require a high-cost mold, making them economically unviable for producing unique devices. In this study, a mixture of titanium powder and an inlay wax binder was developed for moldless forming and sintering. The formability of the mixture, the dimensional changes after sintering, and the physical and mechanical properties of the sintered porous titanium were evaluated. A 90:10 wt % mixture of Ti powder and wax binder was created manually at 70°C. After debindering, the specimen was sintered in Ar at 1100°C without any mold for 1, 5, and 10 h. The shrinkage, porosity, absorption ratio, bending and compressive strength, and elastic modulus were measured. The bending strength (135-356 MPa), compression strength (178-1226 MPa), and elastic modulus (24-54 GPa) increased with sintering time; the shrinkage also increased, whereas the porosity (from 37.1 to 29.7%) and absorption ratio decreased. The high formability of the binder/metal powder mixture presents a clear advantage for fabricating tailor-made bone and hard tissue substitution units. Moreover, the sintered compacts showed high strength and an elastic modulus comparable to that of cortical bone.
定制多孔钛植入物在骨科和牙科应用中都有很大的应用前景。然而，传统的粉末冶金工艺需要高成本的模具，因此对于生产独特的设备来说在经济上是不可行的。在这项研究中，开发了一种钛粉末和镶嵌蜡结合剂的混合物，用于无模成型和烧结。评估了混合物的可成形性、烧结后的尺寸变化以及烧结多孔钛的物理和机械性能。在 70°C 下手动制备了 90:10wt%的 Ti 粉末和蜡结合剂混合物。脱蜡后，将试样在 Ar 中于 1100°C 下烧结 1、5 和 10 h，无需任何模具。测量了收缩率、孔隙率、吸收率、抗弯强度和压缩强度以及弹性模量。抗弯强度（135-356 MPa）、压缩强度（178-1226 MPa）和弹性模量（24-54 GPa）随烧结时间的增加而增加；收缩率也增加，而孔隙率（从 37.1%降至 29.7%）和吸收率降低。结合剂/金属粉末混合物的高成形性为制造定制的骨和硬组织替代单元提供了明显的优势。此外，烧结压坯表现出高强度和与皮质骨相当的弹性模量。
