Immediate implants covered with connective tissue membranes: human biopsies

Area of Science:

• Dental Implantology
• Biomaterials Science
• Oral Surgery

Background:

• Osseointegration is crucial for dental implant success, typically requiring minimal bone gaps.
• Previous studies limited immediate implant placement to narrow bone defects (<2 mm horizontal defect dimension).
• Modifications to implant surface, membrane type, and placement were explored to improve osseointegration in wider defects.

Purpose of the Study:

• To evaluate osseointegration of sandblasted, acid-etched (SLA) titanium implants placed immediately into extraction sockets with varying horizontal defect dimensions (HDD).
• To assess the impact of a new membrane technique on bone-to-implant contact in immediate implant placement.
• To determine if immediate implant placement is feasible in wider bone defects (>4 mm HDD).

Main Methods:

• Ten SLA titanium implants were placed in immediate extraction sites in 5 patients.
• Horizontal defect dimensions (HDD) ranged from 0.0 to >4.0 mm.
• Implants were covered with connective tissue membranes, and primary soft tissue closure was achieved. Histological examination was performed after 6 months.

Main Results:

• Osseointegration occurred successfully across all tested HDDs.
• Bone-to-implant contact percentages were similar between narrow (0.0-1.5 mm) and wide (>4.0 mm) HDDs.
• Initial vertical bone-to-implant contact was comparable across different HDD groups.

Conclusions:

• Successful osseointegration was achieved with immediate implant placement in human extraction sites with HDDs >4 mm using SLA implants and connective tissue membranes.
• The specific factors (implant surface, membrane type/placement) contributing to improved osseointegration in wider defects require further investigation.
• These findings suggest expanded indications for immediate dental implant placement, even in cases with significant bone loss.