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Abstract
Today, millions of prostheses and implants are needed to maintain the quality of life of the aging population. If we exclude the need for repair of the body and ”spare parts”, intentionally or unintentionally created by the individual himself or herself, enough problems are brought with the increase life span of humans. Big load-bearing joints of the skeleton system, for example, were probably not designed by nature to last the extra 30-40 years of active life humans due to the tremendous development of society during the previous century. Therefore, material scientists have, for decades, faced the challenge of developing advanced biomaterials to repair the defects of the human body or to replace damaged parts. The characteristic of a biomaterial depends on its intended use in the body. Biomaterials used to fill tissue defects are often designed to be resorbed by time and to be replaced by host tissue. A load-bearing implant, however, must be comprised of quite different properties. It must retain its form and rigidity for years without reaction negatively in the highly corrosive environment provided by the human body. Special metals or metal alloys, bioceramics, polymers and composites optimized for strength and corrosion resistance (Pilliar, R. M. 1991, Bobyn, J. D et al 1994, Hench, L. L 1996, Hench, L. L 1998) have been successfully used in orthopedics and deontology as permanent replacements or as removable devices in stabilizations of bone fractures.