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Histologic investigations on 33 retrieved Nobelpharma implants
T Albrektsson1, A R Eriksson, B Friberg
1Department of Handicap Research, University of Gothenburg, Sweden.
Clinical Materials
|December 9, 1992
Summary
Nobelpharma implants showed high bone-to-implant contact even after removal for various reasons. This indicates good osseointegration despite clinical issues like bone loss or fracture.
Area of Science:
- Biomaterials Science
- Dental Implantology
- Orthopedic Surgery
Background:
- Dental implants are widely used for tooth replacement.
- Long-term implant success depends on osseointegration and surrounding tissue health.
- Implant retrieval studies provide valuable insights into in vivo performance.
Purpose of the Study:
- To evaluate the bone-to-implant contact (BIC) in retrieved Nobelpharma implants.
- To analyze the reasons for retrieval of clinically stable implants.
- To correlate BIC with implant function duration and retrieval causes.
Main Methods:
- Thirty Nobelpharma implants were retrieved from 17 patients after 1-16 years of function.
- Reasons for retrieval included bone resorption, soft tissue disorders, psychological factors, fracture, and post-mortem cases.
- Computerized morphometric analysis was used to assess BIC at the light microscopic level.
Main Results:
- An average of 84.9% direct bone-to-implant contact was measured at the cortical passage.
- An average of 81.8% surface bone area was found within individual implant threads.
- High BIC was observed despite reasons for retrieval such as bone resorption and implant fracture.
Conclusions:
- Nobelpharma implants demonstrate substantial osseointegration, evidenced by high BIC, even after prolonged clinical function.
- Implant removal was often associated with factors beyond initial osseointegration, such as bone loss and mechanical failure.
- The findings suggest that while osseointegration is robust, other clinical and biological factors influence long-term implant success.