The life of implants increases as knowledge and experience of implantology increases. Research has shown that in the lower jaw 96% of implants stil function whitout any problems after 10 years. The prognosis in the upper jaw was always slightly lower than 93%. The reason for the differnce is the somewhat more brittle structure of the bone in the upper jaw. These percentages are expected to be higher for the implants that are currently being fitted because the surfaces of the implants and the surgical techniques have improved considerably compared to 10 years ago.