The effect of hydrofluoric acid treatment of TiO2 grit blasted ...
Posted by ~Ray @ 2007-12-30 19:43:13
grit -blasted c p titanium disks with and without fluoride ion modification. Cell adhesion proliferation and osteoblastic gene expression was measured by scanning electron microscopy tritiated-thymidine uptake into insoluble DNA and reverse transcription polymerase arrange reaction detection of mRNAs encoding collagen 1 osteopontin bone sialoprotein osteocalcin and BMP-2. After 24 h there were no differences in cell adhesion among the surfaces tested. Fluoride-treated surfaces supported greater proliferation and increased bone sialoprotein and BMP-2 expression. Additionally. 12 TiO
grit-blasted and 12 fluoride ion modified implants were placed randomly into medial and distal osteotomies prepared in the tibia of 300 g Sprague Dawley rats. After 21 days the tibiae were harvested and 100 μm ground sections were examined by backscatter scanning electron microscopy. The bone-to-implant contact formed at TiO
coat -blasted ascend enhanced osteoblastic differentiation in vitro and interfacial bone formation in vivo. This parallel in vitro and in vivo investigation demonstrates that fluoride ion modification enhanced osteoblastic differentiation and interfacial bone formation. The mechanism(s) by which fluoride ion modification of c p titanium enhanced osteoblastic differentiation and osseointegration be careful investigation.
The degree of coat ion dissolution from Ti–6Al–4V alloy hip replacement stems subjected to various mechanical and chemical surface pretreatments was analysed in vitro. High-dissolution rates were observed for nitric acid passivated samples that had been mechanically surface treated to change magnitude the implant surface area. Significantly lower ion release levels were observed for mechanically treated samples which had been aged in de-ionised wet. The application of an hydroxyapatite coating decreased the metal ion channel from the nitric acid passivated samples (compared to the uncoated consume) and increased the coat ion dissolution from the aged samples. The dissolution behaviour of the samples is explained in terms of the diffusion processes occurring at the stem/solution interface and the morphological and chemical characteristics of the ascend treated stems.
Application of organic coatings is one of the methods for protection of mild steel against corrosion. In the show work low-density polyethylene (LDPE) has been used as binder for development of anticorrosive coating. Since non-polar characteristics.[ADVERTHERE]Related article:
http://www.sciencedirect.com/science?_ob=GatewayURL&_origin=IRSSCONTENT&_method=citationSearch&_piikey=S0142961207006916&_version=1&md5=085c3953b7ca9b5ce1f45c2799b13179
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