Journal article
The role of interfacial mechanics in the prediction of global mechanical behavior of a bioactive composite: an in vitro study
The Journal of oral implantology, v 32(2), pp 63-71
2006
PMID: 16704107
Abstract
A bioactive bone-tissue substitute, hydroxyapatite (HA)-polymethylmethacrylate (PMMA) with the addition of a copolymer coupling agent, was examined in vitro to determine the influence of the coupling agent on the local mechanical properties of the system before and after simulated biologic conditions. Nano-indentation of the cross-sectional interface between the HA and PMMA of the composite was studied. The fracture mechanism and position of each indent mark were analyzed at up to 5000x magnification under field-emission, environmental-scanning electron microscopy. The local interfacial results were compared with global quasistatic compression test results. It was found that nano-indentation of the interface could predict changes in global mechanical behavior of the composite. Both interfacial and global Young's moduli were reduced after immersion in the simulated biologic media. Although the coupling agent improved the interfacial and global mechanical properties before and after 24 hours in in vitro immersion, it did not affect the surface bioactivity of the system, as shown in the measurement of calcium and phosphate concentration uptake. Thus, nano-indentation is a sensitive technique for examining interfacial mechanics and mechanical consequences of biologic reactivity of composite materials.
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Details
- Title
- The role of interfacial mechanics in the prediction of global mechanical behavior of a bioactive composite: an in vitro study
- Creators
- Emily Ho - Materials Science and Engineering Department at Drexel University, Philadelphia, Pa, USAMichele Marcolongo
- Publication Details
- The Journal of oral implantology, v 32(2), pp 63-71
- Publisher
- United States
- Resource Type
- Journal article
- Language
- English
- Scopus ID
- 2-s2.0-33744816830
- Other Identifier
- 991014877690404721