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Comparison of shear strength of osteotomies fixed with absorbable self-reinforced poly-L-lactide and metallic screws

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Abstract

Nine experimental osteotomies on the neck of a sheep's left mandibular condyle were fixed with self-reinforced poly-L-lactide (SR-PLLA) screws. Metallic screws were used in a group of nine sheep for the same fixation of the osteotomy. The right condyle of each sheep acted as a control. Radiographic analysis was carried out at 3 weeks and at sacrifice (6, 12 or 24 weeks) when the shear force needed to break the osteotomy site was measured. No significant differences were detected at 3, 6 or 24 weeks, but at 12 weeks the SR-PLLA-fixed condyles seemed to tolerate shear force somewhat better.

The results are very promising and have led us to continue with development of smaller screws and a self-reinforced poly-L-lactide plate.

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Authors and Affiliations

  1. Department of Oral and Maxillofacial Surgery, University of Helsinki, Mannerheimintie 172, 00300, Helsinki, Finland

    R. Suuronen

  2. Department of Surgery, College of Veterinary Medicine, Helsinki, Finland

    L. Wessman & M. Mero

  3. Institute of Plastics Technology, Tampere University of Technology, Finland

    P. Törmälä

  4. Department of Orthopaedics and Traumatology, Helsinki University Central Hospital, Finland

    J. Vasenius, E. Partio, K. Vihtonen & S. Vainionpää

Authors
  1. R. Suuronen
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  2. L. Wessman
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  3. M. Mero
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  4. P. Törmälä
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  5. J. Vasenius
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  6. E. Partio
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  7. K. Vihtonen
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  8. S. Vainionpää
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Suuronen, R., Wessman, L., Mero, M. et al. Comparison of shear strength of osteotomies fixed with absorbable self-reinforced poly-L-lactide and metallic screws. J Mater Sci: Mater Med 3, 288–292 (1992). https://doi.org/10.1007/BF00705295

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  • DOI: https://doi.org/10.1007/BF00705295

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