Bioactive glass can potentially reinforce large bone defects

N.A.P. van Gestel, D.J.W. Hulsen, J.J.C. Arts, J.A.P. Geurts, K. Ito, B. van Rietbergen

Research output: Contribution to conferenceAbstract

Abstract

Introduction: Bioactive glass (BAG) has been studied widely and seems to be a very promising biomaterial in regeneration of large bone defects and osteomyelitis treatment, because of its bone bonding and antibacterial properties[1]-[5]. Potentially, it could also mechanically reinforce large defects, thus making it suitable for load-bearing applications. However, the mechanical properties of the reconstructive layer and its dependence on BAG:bone allograft mixture composition are unknown.
In this study, we measured the mechanical properties of different impacted BAG/bone graft mixtures. Then these properties were used in micro-Finite Element (FE) patient-specific models to investigate whether these mixtures could restore mechanical properties of large bone defects.
Materials and Methods: Five different S53P4 BAG/bone graft mixtures were impacted in a cylindrical holder, mechanically tested in confined compression and scanned with micro-CT. From these images, the mixture was identified by its three phases: bone, glass or interface region. Micro-Finite-Element (FE) models of the composites were made using a Young’s modulus of 2.5 GPa for bone and 35 GPa for BAG. The Young’s modulus for the interface region was determined by fitting experimental and micro-FE results for the same specimens.
High-Resolution peripheral quantitative CT scans of a 9 mm region of the distal tibia of seven subjects were used for studying the reinforcement potential. Micro-FE models of this region were made to determine its stiffness in the original state, with a simulated cortical defect, and after that a mixture of BAG/bone or BAG alone was simulated in the defect.
Results: The confined compression tests showed a strong dependence of the Young’s modulus of the BAG/bone composite on the amount of BAG, ranging from 116.7±18.2 to 654.2±35.2 MPa. The micro-FE results could fairly reproduce these measured moduli, when using a stiffness of 25 MPa for the interface layer (R2=0.678, see Figure 1).
Original languageEnglish
Number of pages1
DOIs
Publication statusPublished - 30 Mar 2016
Event10th World Biomaterials Congress (WBC 2016), May 17-22, 2016, Montréal, Canada - Palais des Congrès de Montréal , Montréal, Canada
Duration: 17 Jun 201622 Jun 2016
http://www.wbc2016.org/

Conference

Conference10th World Biomaterials Congress (WBC 2016), May 17-22, 2016, Montréal, Canada
Abbreviated titleWBC 2016
CountryCanada
CityMontréal
Period17/06/1622/06/16
Internet address

    Fingerprint

Cite this

van Gestel, N. A. P., Hulsen, D. J. W., Arts, J. J. C., Geurts, J. A. P., Ito, K., & van Rietbergen, B. (2016). Bioactive glass can potentially reinforce large bone defects. Abstract from 10th World Biomaterials Congress (WBC 2016), May 17-22, 2016, Montréal, Canada, Montréal, Canada. https://doi.org/10.3389/conf.FBIOE.2016.01.01375