Tissue healing in implants immediately placed into postextraction sockets: a pilot study in a mini-pig model.

Area of Science:

• Dental Implantology
• Oral Surgery
• Biomaterials Science

Background:

• Immediate implant placement in extraction sockets is a common surgical protocol.
• Understanding osseointegration and bone healing is crucial for implant success.
• The development of an epithelial seal is important for long-term implant stability.

Purpose of the Study:

• To evaluate osseointegration rates at different implant levels after immediate placement.
• To assess the maturation of newly formed bone around implants over 60 days.
• To investigate the development of the epithelial seal in this model.

Main Methods:

• A pilot in vivo study using 8 male adult mini-pigs.
• Extraction of premolars followed by immediate placement of Frialit-2 implants.
• Histologic and histomorphometric analysis of bone specimens at 7, 15, 30, and 60 days.

Main Results:

• Bone-to-implant contact (BIC) increased significantly over 60 days, particularly at the apical and middle levels.
• Bone maturation showed an increase in trabecular thickness and a decrease in number over time.
• The epithelial seal developed effectively, with minimal apical migration.

Conclusions:

• Osseointegration occurs successfully in mini-pig models even without initial bone contact when implants are placed immediately into fresh extraction sockets.
• Immediate implant placement is a viable option for achieving osseointegration and bone regeneration.
• The study supports the predictability of immediate implant placement protocols.