Amorphous and crystalline polyetheretherketone: Mechanical properties and tissue reactions during a 3-year follow-up
| Autor: | Ilmari Hiidenheimo, Heikki Kainulainen, Erkki Wuolijoki, Immo Rantala, Ilkka Kallela, Tuomo Nieminen |
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| Rok vydání: | 2007 |
| Předmět: |
Materials science
Yield (engineering) Polymers Biomedical Engineering Biocompatible Materials Polyethylene Glycols Biomaterials Prosthesis Implantation Crystallinity Benzophenones Differential scanning calorimetry Tensile Strength Ultimate tensile strength Materials Testing Peek Animals Anesthesia Composite material Tensile testing Inflammation Sheep Metals and Alloys Prostheses and Implants Ketones eye diseases Internal Fixators Amorphous solid Eosinophils Ceramics and Composites sense organs Elongation Follow-Up Studies |
| Zdroj: | Journal of biomedical materials research. Part A. 84(2) |
| ISSN: | 1549-3296 |
| Popis: | The study was aimed to test the mechanical strength, structural stability, and tissue reactions of optically amorphous and crystalline polyetheretherketone (PEEK) plates during a 3-year follow-up in vivo and in vitro. The injection-moulded PEEK plates were implanted to the dorsal subcutis of 12 sheep, which were sacrificed at 6-156 weeks. Thereafter, the plates were subjected to tensile tests, and levels of crystallinity were assessed by differential scanning calorimetry (DSC). Histological evaluation was carried out using the paraffin technique. In vitro properties were examined with the tensile test and DSC at 0-156 weeks. Tissue reactions were mild and fairly similar for the amorphous and crystalline plates at corresponding points in time. The mechanical characteristics of the plates remained stable over the entire follow-up. The tensile yield load and elongation at the yield load of the crystalline plates were roughly double ( approximately 500 vs. 270 N and 2.4 vs. 1.4 mm, respectively) in comparison to the amorphous plates. The elongation at break load of the crystalline plates was smaller than that of the amorphous ones (6 vs. 10). The level of crystallinity in both the optically amorphous ( approximately 15%) and crystalline (32-34%) plates remained invariable during the follow-up. The in vitro and in vivo data coincided remarkably well. In conclusion, both optically amorphous and crystalline PEEK plates are suitable for the fixation of fractures and osteotomies. |
| Databáze: | OpenAIRE |
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