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Bonegraft Using Octacalcium Phosphate Collagen Composite with Teriparatide and Polylactic Acid Cage
Atsumu Kouketsu1, Ryosuke Iwama1, Yushi Ezoe2
1Division of Oral and Maxillofacial Oncology and Surgical Sciences, Tohoku University Graduate School of Dentistry, Sendai, Japan.
Tissue Engineering. Part A
|November 28, 2025
Summary
A novel polylactic acid (PLA) cage design effectively enhanced bone regeneration using octacalcium phosphate (OCP) and collagen (Col) composites. The solid PLA cage promoted uniform bone formation, unlike perforated designs that allowed fibrous tissue infiltration.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Orthopedic Surgery
Background:
- Extensive jaw defects pose challenges for current bone grafting methods like vascularized grafts or titanium mesh.
- These conventional techniques are associated with limitations including graft resorption, infection, and the need for reoperation.
- Octacalcium phosphate (OCP) is a biocompatible and osteoconductive material with potential for bone regeneration.
Purpose of the Study:
- To evaluate a novel bone regeneration therapy using teriparatide (TPTD)-treated OCP/collagen (Col) composites encased in 3D-printed polylactic acid (PLA) cages.
- To assess the influence of PLA cage design (no holes, one large hole, several small holes) on bone formation in a rat calvarial defect model.
Main Methods:
- TPTD-treated OCP/Col composites were encased in three types of cylindrical PLA cages (no holes, one hole, multiple small holes).
- These constructs were implanted into rat calvarial defects.
- Bone regeneration was assessed using microcomputed tomography (micro-CT), histological analysis, and immunohistochemical staining for bone markers.
Main Results:
- Micro-CT showed higher radiopacity in the 'no hole' cage group, indicating greater bone formation.
- Histological analysis confirmed new bone formation in all groups, but the 'no hole' cage promoted more extensive and uniform bone growth.
- Perforated cages allowed fibrous tissue infiltration, hindering bone regeneration beneath the holes.
Conclusions:
- Encasing TPTD-treated OCP/Col composites in PLA cages is an effective strategy for promoting bone regeneration.
- The 'no hole' PLA cage design facilitates uniform and successful bone formation, outperforming perforated designs.
- This approach offers a promising alternative to conventional bone grafting for oral and maxillofacial reconstruction.
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