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Biological fixation of endosseous implants
1Dipartimento di Scienze Anatomiche Umane e Fisiopatologia dell'Apparato Locomotore, Università di Bologna, Via Irnerio 48, 40126 Bologna, Italy. marcofranchi@inwind.it
Micron (Oxford, England : 1993)
|October 20, 2005
Summary
Bone chips and newly formed trabecular bone create a biological anchorage for titanium implants, ensuring stability. This network facilitates osseointegration and bone turnover around various implant surfaces within two weeks.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Histology
Background:
- Primary implant stability relies on mechanical fixation.
- Biological anchorage is crucial for long-term osseointegration during healing.
Purpose of the Study:
- To investigate the histological aspects of biological fixation around titanium screws.
- To evaluate the role of bone chips and early bone formation in implant anchorage.
Main Methods:
- Forty-eight titanium screws with varied surfaces (smooth, plasma sprayed, sand blasted) were implanted in sheep tibiae and femurs.
- Histological analysis using light microscopy and Scanning Electron Microscopy (SEM) was performed at 1 hour, 14 days, and 90 days post-implantation.
Main Results:
- At 1 hour, the implant-bone gap contained blood clot and bone chips.
- By 14 days, new trabecular bone enveloped bone chips, forming a biological fixation network.
- At 90 days, mature lamellar bone replaced earlier structures, with marrow spaces present.
Conclusions:
- Trabecular bone and bone chips form a crucial three-dimensional network for biological implant fixation within two weeks.
- Host bone chips may promote peri-implant osteogenesis.
- Peri-implant marrow spaces facilitate bone turnover around the implant.