Osseointegration
Also known as: Implant integration, bone integration, osteointegration, direct bone anchorage
The biological process by which bone fuses permanently with a titanium implant.
Osseointegration is the direct structural and functional connection between living bone and the surface of a titanium implant. It is the biological foundation of modern implant dentistry and the reason implants can last a lifetime.
Discovery
Osseointegration was discovered accidentally in 1952 by Swedish orthopaedic surgeon Professor Per-Ingvar Brånemark. Researching bone healing, he found that titanium chambers he had implanted in rabbit femur bone had fused permanently and could not be removed. He spent the following decade studying the phenomenon and performed the first human dental implant in 1965.
The process
After an implant is placed, a series of biological events unfolds:
- Blood clot forms around the implant surface
- Inflammatory cells arrive and begin cleaning the site
- Osteoblasts (bone-forming cells) migrate to the surface
- Woven bone (initial, less organised bone) is deposited directly on the implant surface
- Woven bone is gradually replaced by mature lamellar bone over months to years
Timeline
Primary osseointegration — sufficient for loading — typically occurs over 8–16 weeks. Bone continues to mature and strengthen for up to a year. In denser bone, osseointegration may be confirmed as early as 6–8 weeks.
What can disrupt it?
- Smoking — reduces blood flow and oxygen supply to the healing bone
- Uncontrolled diabetes — impairs immune response and healing
- Excessive movement or loading during the healing phase
- Infection at the implant site
- Overheating of bone during drilling
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