Self-reinforced polylactide/polyglycolide 80/20 screws take more than 1½ years to resorb in rabbit cranial bone
✍ Scribed by Johanna Tiainen; Ylermi Soini; Pertti Törmälä; Timo Waris; Nureddin Ashammakhi
- Book ID
- 102297913
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 413 KB
- Volume
- 70B
- Category
- Article
- ISSN
- 1552-4973
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✦ Synopsis
Abstract
The aim of this study was to assess tissue reactions to bioabsorbable self‐reinforced polylactide/polyglycolide (SR‐PLGA) 80/20 miniscrews in rabbit cranial bone. One PLGA screw was implanted on one side and one titanium screw on the other side of the sagittal suture (n = 21). Three animals were sacrificed after 2, 4, 8, 16, 24, 54, and 72 weeks. In histological examination the numbers of macrophages, giant cells, active osteoblasts, and fibrous tissue layers were assessed and degradation of the bioabsorbable screws was evaluated. After 2 weeks, macrophages were seen near the heads of both screws. After 4 and 8 weeks, the bioabsorbable screws were surrounded by fibrous tissue. Osteoblastic activity and groups of several giant cells were seen. After 24 weeks, a significant change in the morphology of the PLGA screws had occurred. Osteoblastic activity and the amount of giant cells had decreased. After 1 year, some PLGA biomaterial was still present. PLGA screws had been replaced by adipose tissue, fibrous tissue, and “foamy macrophages” that had PLGA particles inside them. After 1½ years, the amount of biomaterial remaining had decreased remarkably. The particles of biomaterial were inside foamy macrophages. SR‐PLGA 80/20 screws are biocompatible and have no clinically manifested complications when used in the cranial bone of rabbits. No contraindications as regards their clinical use in craniofacial surgery was found when these screws were studied in the cranial bones of rabbits. © 2004 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 70B: 49–55, 2004