Titanium Alloys for Biomedical Applications

Abstract

The low Young’s modulus of β-type titanium alloys makes them advantageous for use in medical implant devices, as they are effective in both preventing bone resorption and promoting good bone remodeling. The development of low Young’s modulus β-type titanium alloys for biomedical applications is described herein, along with a discussion of suitable methods for even greater modulus reductions. Since there is often occasion to remove implant devices, titanium alloys suitable for removable implants are also described. It has recently been noted that although patients require low Young’s modulus titanium alloys, a high modulus is needed by surgeons. Consequently, β-type titanium alloys with a self-tunable Young’s modulus are also explored. An evaluation of the effectiveness of low Young’s modulus β-type titanium alloys in preventing stress shielding is provided, which is based on the results of animal testing. Means of enhancing the mechanical biocompatibilities of β-type titanium alloys for biomedical applications are also described along with the suitability of those β-type titanium alloys which exhibit super-elastic and shape-memory behavior. Finally, the unique behavior of some β-type titanium alloys for biomedical applications is discussed.