Patient-friendly definition from the DentistsDirectory.org dental glossary.
Osseointegration is the biological process by which living bone cells grow directly onto and around the surface of a dental implant, integrating it with the surrounding jaw as firmly as a natural tooth root. The term was coined by Swedish orthopaedic surgeon Per-Ingvar Brånemark, who discovered the phenomenon in the 1950s when he found he could not remove a titanium device from rabbit bone — the bone had grown onto it. This discovery became the biological basis of modern implant dentistry.
Titanium is used for dental implants primarily because of its exceptional osseointegration properties. The body treats titanium as biologically neutral — it does not trigger an immune rejection response — and bone cells (osteoblasts) actively adhere to and grow onto the micro-textured surface of a titanium implant. Modern implant surfaces are treated to be rough at the microscopic level, dramatically increasing the surface area available for bone contact and accelerating the osseointegration process.
Osseointegration typically takes three to six months from the time of implant placement. Lower jaw implants generally integrate faster (and with higher reliability) than upper jaw implants because the lower jaw has denser bone. During this period, patients must avoid excessive loading of the implant. Factors that can impair osseointegration include smoking (significantly increases failure risk), uncontrolled diabetes, certain medications affecting bone metabolism, and poor bone quality. Once osseointegration is confirmed — typically through clinical stability testing and X-rays — the abutment and final crown are placed.