Rapid Prototyping And Titanium Casting In Implantology.
Wednesday, June 30, 2010 9:16Every year in the world there are multi-million recovery operations with replacement of bone tissue with metal implants and end prostheses. Such operations are typical for maxillofacial surgery and neurosurgery, traumatology, orthopedics, dentistry.
The main requirement for any implant – it is reliability – the ability to serve the function of the replacement of bone tissue during a long time. Reliability is primarily attributable to the possibility of osseointegration, i.e., firm ingrowth of the implant into the bone without inflammatory reactions that contribute to implant failure. The implant should be made of biocompatible material, be strong enough and have a large surface area in contact with bone. From the perspective of the patient the implant should not be too expensive, and therefore its design must be technological.
Among the metals, which are used for implantation, the percentage of titanium and its alloys, the best for implantology, in terms of biocompatibility and the unit strength is approximately 5%. This is low-tech titanium and, consequently, expensive implants, which are made mainly by mechanical processing. In addition, rather complex finishing in contact with bone surfaces. There are virtually no cast implants, although the casting of titanium alloys is widely used in the aerospace industry. The fact is that pure titanium has low casting properties, and its casting alloys contain components (nickel, vanadium, etc.) that impact on the surrounding tissue implant.
To expand the scope of application of titanium in medicine, it is required strong special alloys, new designs of implants and advanced technology for their production.
The results allowed to formulate the concept of creating implants directed regeneration of bone tissue (PPD) and to outline the main directions of development of technologies for their production.
PPD – a regular spatial lattice, in which bone grows, securely locking the implant and on the outer and the inner surface. The cells of pores – are polyhedras formed by rods of small diameter (

