Journal
IMPLANT DENTISTRY
Volume 25, Issue 3, Pages 380-386Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/ID.0000000000000415
Keywords
bone-to-implant contact; histomorphometry; osseointegration; removed implants
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Funding
- Ministry of Education, University and Research (M.I.U.R.), Rome, Italy
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Objective: This study aimed at a histologic and histomorphometric analysis of the periimplant tissues and bone-titanium interface reactions in successfully osseointegrated, clinically stable, and immobile human titanium dental implants retrieved after a long loading period. Materials and Methods: In the last 30 months (2013-2015), 21 implants, retrieved from individuals for different causes after a loading period ranging from 4 to 20 years, were sent to the Implant Retrieval Center, University of Chieti-Pescara, Italy. In 4 cases, almost all the bone had been lost during the retrieval, whereas in the remaining 17 cases, mineralized bone was still present. Results: Around the majority of the implants, mature compact bone with few marrow spaces was found. The trabecular bone, constituted by a few thin bone trabeculae, was in a periimplant location around only a few implants. A high percentage of bone-implant contact (BIC) (comprised between 32 +/- 4.1% and 83 +/- 2.9%) was present. In almost all implants, the space within the threads was almost completely filled by compact lamellar bone or by a thin layer of bone. Close and tight contact between bone and implant surface was observed in all specimens with no gaps or connective tissue at the interface. Conclusions: All implants appeared to be well integrated in the surrounding mineralized bone, and all of them showed adequate boneto- implant contact percentages.
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