Bone regeneration over subperiosteal implants using 3D printed polycaprolactone scaffolds

Area of Science:

• Biomaterials Engineering
• Dental Implantology
• Regenerative Medicine

Background:

• Subperiosteal implants face challenges like peri-implantitis and bacterial colonization, often leading to failure.
• Poly (ε-capro-lactone) (PCL) scaffolds offer a potential solution by promoting bone integration around implants.

Purpose of the Study:

• To evaluate the efficacy of 3D-printed PCL scaffolds in enhancing bone deposition over subperiosteal implants in a large animal model.
• To compare the effectiveness of different PCL scaffold designs (Open, Closed, Nano) against a titanium-only control.

Main Methods:

• Subperiosteal titanium implants were placed in four groups: Titanium-only control, PCL Open, PCL Closed, and Nano PCL scaffolds.
• Bone deposition was assessed using computed tomography at 3 and 6 months, and histology at 6 months.
• Statistical analysis (Mixed Model Analysis) was performed to compare bone regeneration between groups.

Main Results:

• PCL scaffolds significantly enhanced bony deposition over subperiosteal implants compared to the titanium-only control.
• The PCL Closed scaffold demonstrated statistically significant improvements in regenerated bone volume and height (radiographically and histologically).
• The PCL Open scaffold also showed improved outcomes compared to the control group.

Conclusions:

• Functionalized PCL scaffolds overlying subperiosteal implants can promote bone deposition, converting them into endosteal implants.
• The PCL Closed scaffold design proved most effective in this large animal pilot study.
• These findings support the potential of PCL scaffolds for improving subperiosteal implant success in future clinical applications.