The discovery of osseointegration originated from accidental phenomena in scientific experiments. 1952，br &； Aring Naimark implanted an optical endoscope made of titanium into the tibia and fibula of rabbits and observed it under a living microscope. At the end of the experiment, the implanted endoscope was firmly combined with the surrounding bone tissue and could not be taken out. Br & amparing Nemak called this phenomenon osseointegration, and began to study and use it. Under the light microscope, the characteristic of osseointegration is that the normal reconstructed bone tissue is in direct contact with the implant, and there is no non-bone tissue in the middle, which can bear the function of continuous conduction and load distribution from the implant to the bone tissue. Before the phenomenon of osseointegration was discovered, implants played a role through the principle of mechanical retention, and the retention force was usually strengthened in the form of lobular implants or mandibular implants. After the establishment of osseointegration theory, it is the standard form of implant to simulate the columnar or root formation of natural root.