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Initiator-particle synergy enables microrough, osteoconductive polymethyl methacrylate bone cement
Juri Saruta1, Yoshihiko Sugita2, Hiroaki Kitajima3
1Weintraub Center for Reconstructive Biotechnology, UCLA School of Dentistry, Los Angeles, CA, USA; Division of Education Planning, School of Dentistry, Kanagawa Dental University, Yokosuka, Japan.
Acta Biomaterialia
|March 13, 2026
Summary
This study introduces a new polymethyl methacrylate (PMMA) bone cement using tri-n-butyl borane (TBB) that enhances osseointegration. The innovative PMMA-TBB cement promotes bone growth and improves implant stability, moving beyond traditional passive fixation.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Polymer Chemistry
Background:
- Conventional polymethyl methacrylate (PMMA) bone cement, initiated by benzoyl peroxide (BPO), is merely biotolerant and lacks osseointegration capabilities.
- PMMA-BPO cement exhibits cytotoxicity due to free radical generation during polymerization.
Purpose of the Study:
- To develop a novel PMMA bone cement with enhanced biocompatibility and osseointegrative properties.
- To engineer controlled microroughness on PMMA bone cement surfaces for improved biological integration.
Main Methods:
- A synergistic approach combining tri-n-butyl borane (TBB) initiator with optimized polymer particle sizes (10-20 µm).
- Surface characterization to quantify microroughness and surface area changes.
- In vitro studies assessing osteoblast and endothelial cell responses.
- In vivo studies evaluating bone-cement integration and gene expression.
Main Results:
- PMMA-TBB cement with optimized particles created micro-protrusions, increasing surface area by 68% and promoting osteoblast attachment, proliferation, and differentiation.
- TBB polymerization reduced free radical generation by ~90%, mitigating cytotoxicity.
- In vivo studies demonstrated contact osteogenesis, upregulation of osteogenic genes, and a 4-6 fold increase in bone-cement interfacial strength.
- Enhanced endothelial cell adhesion and function were observed, suggesting improved angiogenic-osteogenic coupling.
Conclusions:
- The novel PMMA-TBB cement is the first microrough PMMA bone cement with true osteoconductive and osseointegrative properties.
- This initiator-particle design principle transforms PMMA bone cement from passive fixation to biologically active integration.
- PMMA-TBB offers a promising alternative for orthopedic applications, enhancing implant stability and patient outcomes.
