Chien-Ping Ju
National Cheng-Kung University, Taiwan
Title: A low modulus Ti-7.5Mo alloy for dental and orthopedic applications
Biography
Biography: Chien-Ping Ju
Abstract
A biocompatible, low elastic modulus Ti-7.5Mo alloy with an alpha-double-prime (α”) orthorhombic crystal structure for medical applications has been developed at National Cheng-Kung University (NCKU). The mechanical properties of this alloy can be adjusted via different processes for different applications. Its ultimate tensile strength/modulus ratio through one specific process can be more than 200% of Ti-6Al-4V ELI, 300% of grade-4 cp-Ti, and 500% of grade-2 cp-Ti, while its elongation can be adjusted to 10-40%, depending on the application. The low modulus feature is expected to reduce the stress-shielding effect often observed in rigid metallic and ceramic implantation studies. This Ti-7.5Mo alloy is expected suitable for making a dental crown & bridge, RPD, dental implant, orthopedic fixation, miniplate, etc. A head-to-head comparison between α” Ti-7.5Mo and the popularly-used grade-2 cp-Ti in dental casting-related performance shows that cast Ti-7.5Mo alloy performs consistently superior to the cp-Ti. In addition to its much better castability (by 25-100%, depending on wax paten design) and machinability, the unique combination of higher strength and lower elastic modulus of Ti-7.5Mo alloy offers a far higher elastic recovery angle which has advantages over cp-Ti for certain applications such as RPD clasps. The interesting cold working-induced α’’-α’ phase transition phenomenon is also discussed in this presentation. The research was funded by the Ministry of Science and Technology (MOST) Grant No. 107-2221-E-006-016.