Strength retention of self-reinforced poly-L-lactide screws and plates: anin vivo andin vitro study
| Autor: | Seppo Vainionpää, Timo Pohjonen, Riitta Suuronen, Ritva Taurio, Pertti Törmälä, K. Rönkkö, L. Wessman |
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| Rok vydání: | 1992 |
| Předmět: |
Materials science
Biomedical Engineering Biophysics Bioengineering 030206 dentistry 02 engineering and technology 021001 nanoscience & nanotechnology Self reinforced Biomaterials 03 medical and health sciences 0302 clinical medicine Poly-L-lactide Ultimate tensile strength Mechanical strength In vitro study Composite material 0210 nano-technology |
| Zdroj: | Journal of Materials Science: Materials in Medicine. 3:426-431 |
| ISSN: | 1573-4838 0957-4530 |
| Popis: | Self-reinforced poly-L-lactide (SR-PLLA) screws and multilayer plates were studied for their initial mechanical shear and/or tensile strength and strength retentionin vivo andin vitro up to 48 weeks. The plates were studiedin vitro up to 68 weeks. The loss of strength was fasterin vivo thanin vitro. The screws retained more than half of their initial shear strength up to 12 weeksin vivo and over 24 weeksin vitro. By 48 weeks they had lost nearly all of their mechanical strength in both groups. The plates retained over 54% of their initial tensile and 71% of shear strength up to 24 weeksin vivo. The shear strength did not particularly diminish up to 52 weeks of follow-upin vitro whereas the tensile strength was slightly decreased after 36 weeks. After this follow-up time the loss of strength was more rapid and by 68 weeks the shear strength had decreased to 17% and the tensile strength to 0%. |
| Databáze: | OpenAIRE |
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