Immediate postextraction implants: a histologic and histometric analysis in monkeys

Area of Science:

• Oral and Maxillofacial Surgery
• Biomaterials Science
• Periodontology

Background:

• Immediate post-extraction implant placement offers a streamlined treatment approach.
• Titanium plasma-sprayed (TPS) implants are widely used in dental implantology.
• Autogenous bone grafting is a common method for bone augmentation.

Purpose of the Study:

• To assess the peri-implant tissue response to immediately placed TPS implants in extraction sockets.
• To evaluate the bone healing and osseointegration of these implants.
• To determine the bone-implant contact percentage and bone stability after loading.

Main Methods:

• Thirty-six TPS implants were placed immediately into extraction sockets in six cynomolgus monkeys.
• Autogenous bone chips were used as grafting material.
• Implants were loaded after 2 months, and retrieved after 6 months for histomorphometrical analysis.

Main Results:

• Histomorphometrical analysis revealed compact, mature bone surrounding all implants.
• A high bone-implant contact (BIC) percentage of 65-70% was observed.
• No evidence of bone loss was detected after the loading period.

Conclusions:

• Immediate implant placement into fresh extraction sites, combined with autogenous bone grafting, leads to predictable osseointegration.
• TPS implants exhibit favorable bone integration and stability in this clinical scenario.
• This approach may enhance treatment efficiency in dental implantology.