NDLI: Bioactive glass induced in vitro apatite formation on composite GBR membranes

Content Provider	Springer Nature Link
Author	Tirri, Teemu Rich, Jaana Wolke, Joop Seppälä, Jukka Yli Urpo, Antti Närhi, Timo O.
Copyright Year	2008
Abstract	The aim of this study was to investigate in vitro bioactivity of different thermoplastic biodegradable barrier membranes. Three experimental GBR membranes were fabricated using Poly(ε-caprolactone-co-d,l-lactide) P(CL/DL-LA) and particulate bioactive glass S53P4 (BAG; granule size 90–315 μm): (A) composite membrane with 60-wt.% of BAG, (B) membrane coated with BAG; and (C) copolymer membrane without BAG. Membranes were immersed in simulated body fluid (SBF), and their surfaces were characterized with SEM, XRD and EDS after 6 and 12 h and after 1, 3, 5, 7, and 14 days. Calcium phosphate (Ca-P) surface formation was observed on both composite membranes (A and B) but not on the copolymer membrane without bioactive glass (C). The Ca-P precipitation appeared to be initiated on the bioactive glass followed by growth of the layer along the polymer surface. In 6–12 h ion dissolution of the bioactive glass led to formation of the silica rich layer on the surface of the exposed glass granules on composite membrane B whereas only small amounts of silica was observed on the polymer surface of the composite membrane A. At 24 h nucleation of Ca-P precipitation was observed, and by 3–5 days membrane surface was covered with a uniform Ca-P layer transforming from amorphous to low crystalline structure. At 7 days composition and structure of the apatite surface resembled the apatite in bone. Once nucleated, the surface topography seemed to have significant effect on the growth of the apatite layer.
Starting Page	2919
Ending Page	2923
Page Count	5
File Format	PDF
ISSN	09574530
Journal	Journal of Materials Science: Materials in Medicine
Volume Number	19
Issue Number	8
e-ISSN	15734838
Language	English
Publisher	Springer US
Publisher Date	2008-03-24
Publisher Place	Boston
Access Restriction	Subscribed
Subject Keyword	Surfaces and Interfaces, Thin Films Characterization and Evaluation of Materials Metallic Materials Ceramics, Glass, Composites, Natural Methods Polymer Sciences Biomaterials
Content Type	Text
Resource Type	Article
Subject	Biomaterials Biophysics Bioengineering Biomedical Engineering

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