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Porous calcium polyphosphate scaffolds for bone substitute applications in vivo studies
M D Grynpas1, R M Pilliar, R A Kandel
1Institute for Biomaterials and Biomedical Engineering, University of Toronto, Ontario, Canada. grynpas@mshri.on.ca
Biomaterials
|May 9, 2002
Summary
Calcium polyphosphate (CPP) macroporous rods support bone ingrowth in rabbits. CPP rod degradation rate can be controlled by particle size, making it a promising bone graft material.
Area of Science:
- Biomaterials Science
- Orthopedic Research
- Tissue Engineering
Background:
- Calcium polyphosphate (CPP) is a potential biomaterial for bone regeneration.
- Macroporous scaffolds are crucial for facilitating bone ingrowth.
- Controlling scaffold degradation is key for successful bone repair.
Purpose of the Study:
- To evaluate the bone ingrowth potential of porous CPP rods in vivo.
- To assess the degradation characteristics of CPP rods based on particle size.
- To determine the suitability of CPP as a bone graft substitute.
Main Methods:
- Porous CPP rods of varying particle sizes (45-250 microm) were fabricated via gravity sintering.
- Rods were implanted into the distal femur of New Zealand white rabbits.
- Histological analysis was performed at multiple time points (2 days to 1 year).
Main Results:
- CPP macroporous rods demonstrated excellent bone ingrowth without adverse reactions.
- Bone formation between 12 weeks and 1 year was comparable to natural bone volume.
- CPP degradation rate was inversely proportional to initial particle size, with faster degradation for smaller particles.
Conclusions:
- Porous CPP rods effectively support bone ingrowth and regeneration.
- The degradation rate of CPP can be modulated by controlling the starting particle size.
- CPP is a promising biomaterial for orthopedic applications requiring bone regeneration.