Holding power of bioabsorbable self-reinforced poly-L/DL-lactide 70/30 tacks and miniscrews in human cadaver bone
| Autor: | Minna Kellomäki, Pertti Törmälä, Johanna Tiainen, Nureddin Ashammakhi, Milomir Ninkovic, Timo Waris, Sanna Leinonen |
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| Rok vydání: | 2003 |
| Předmět: |
Adult
Dental Stress Analysis Polymers Surface Properties medicine.medical_treatment Polyesters Bone Screws Dentistry Biocompatible Materials Bone Nails Self reinforced Statistics Nonparametric Cadaver Absorbable Implants Medicine Internal fixation Humans Lactic Acid Metatarsal Bones Human cadaver Orthodontics business.industry General Medicine Equipment Design Middle Aged Time of death Otorhinolaryngology Bone surgery Surgery Implant Stress Mechanical business Cadaveric spasm |
| Zdroj: | Tampere University |
| ISSN: | 1049-2275 |
| Popis: | Several bioabsorbable internal fixation systems are currently in use in the field of bone surgery. To test the mechanical properties of recently developed amorphous self-reinforced poly-L/DL-lactide [SR-P(L/DL)LA] 70/30 tacks in comparison with commercially available SR-P(L/DL)LA 70/30 (BioSorbFX; Bionx Implants Ltd) miniscrews, SR-P(L/DL)LA miniscrews (length = 6.0 mm, core diameter = 1.5 mm, thread diameter = 2.0 mm) and tacks (length = 5.4 mm, core diameter = 1.5 mm, thread diameter = 2.0 mm) were applied to human cadaveric metatarsal (MT) bones (6 pairs of fourth MT bones and 6 pairs of fifth MT bones from donors who were from 29 to 56 years of age at the time of death). Pullout force was measured using a mechanical testing machine. Forty-eight pullout tests were carried out for each implant type. The Student t test, Mann-Whitney U test, and Spearman coefficient were used for statistical evaluation. The pullout force of tacks was 135.0 ± 26.1 N, and that of the miniscrews was 119.3 ± 26.1 N (P = 0.04, statistically significant difference). Accordingly novel SR-P(L/DL)LA 70/30 tacks have a statistically better pullout strength than the SR-P(L/DL)LA 70/30 miniscrews when tested in cadaver MT bones. |
| Databáze: | OpenAIRE |
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