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Mesoporous silica nanoparticle-functionalized poly(methyl methacrylate)-based bone cement for effective antibiotics
Shou-Cang Shen1, Wai Kiong Ng, Zhilong Shi
1Institute of Chemical and Engineering Sciences, A*STAR (Agency for Science, Technology and Research), 1 Pesek Road, Jurong Island, Singapore, 627833, Singapore. shen_shoucang@ices.a-star.edu.sg
Journal of Materials Science. Materials in Medicine
|July 26, 2011
Summary
Mesoporous silica nanoparticles (MSN) enhance poly(methyl methacrylate)-based bone cements for sustained antibiotic release, significantly reducing post-operative infection risk. This formulation shows improved drug delivery and maintains bone cement strength.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Orthopedic Surgery
Background:
- Poly(methyl methacrylate) (PMMA)-based bone cements are widely used in orthopedic procedures.
- Current bone cements have limited antibiotic release (5% for 1 day), increasing post-operative joint infection risks.
- There is a need for improved bone cement formulations with enhanced and sustained antibiotic delivery.
Purpose of the Study:
- To functionalize PMMA-based bone cements with mesoporous silica nanoparticles (MSN).
- To evaluate the antibiotic release profile and antibacterial efficacy of MSN-formulated bone cements.
- To assess the impact of MSN on the mechanical properties and cytotoxicity of bone cement.
Main Methods:
- Formulation of PMMA bone cement with 8 wt% MSN.
- In vitro evaluation of antibiotic release kinetics over 80 days.
- Assessment of mechanical properties (bending modulus, compression strength).
- In vitro antibacterial assays and cytotoxicity tests.
Main Results:
- MSN-formulated bone cement demonstrated a 14-fold increase in antibiotic release efficiency compared to commercial cements.
- Sustained antibiotic release was achieved for up to 80 days.
- MSN incorporation did not negatively affect the critical weight-bearing mechanical properties of the bone cement.
- In vitro assays confirmed sustained antibacterial effects and low cytotoxicity.
Conclusions:
- MSN-formulated bone cement offers a promising strategy for enhanced and prolonged antibiotic delivery.
- The developed material effectively combats bacterial infections while maintaining structural integrity.
- This innovation holds significant potential for reducing post-operative complications in joint replacement surgeries.
