It is a kind of edentulous prosthetic method based on the lower structure implanted into bone tissue to support and keep the upper tooth prosthesis. It comprises two parts: the lower supporting implant and the upper dental prosthesis. It uses artificial materials (such as metal, ceramics etc.) . To make implants (similar to the root shape), which are implanted into the tissues (usually the upper and lower jaw) by surgical methods, and get the solid retention support of bone tissue, and connect the tooth restoration supporting the upper part by special devices and ways. Implant teeth can get the restoration effect which is very similar to the function, structure and aesthetic effect of natural teeth. It has become the first choice for more and more patients with missing teeth.