Fabrication and Characterization of Bioactive Glass Coatings on Co-Cr Implant Alloys

Abstract

ASilicate glass coatings on Vitallium Ò , a Co-Cr alloy were prepared using a simple enameling technique. The composition of the glasses in the SiO 2 -Na 2 O-K 2 O-MgO-CaO-P 2 O 5 system has been tailored to match the thermal expansion of the alloys. The optimum glass composition and firing conditions (temperature and time) needed to fabricate homogeneous coatings with good adhesion to the alloy were determined. The final coating thickness ranged between 40 and 60 mm. Coatings fired under the optimum conditions do not delaminate during indentation tests of adhesion. Excellent adhesion to the alloy has been achieved through the formation of 150 nm thick interfacial layers (CrOx). The silicate glass can be successfully coated to Co-Cr alloy and formed hydroxyapatite on the glass surface when immersed in a simulated body fluid (SBF) for 30 days.

Electrochemical Deposition of 58SiO2‐33CaO‐9P2O5 Nanobioactive Glass Particles on Ti‐6Al‐4V Alloy for Biomedical Applications

“…Initially, there is dissolution of the silicon matrix coating after immersion in SBF. Such dissolutions are reported earlier through pulse laser‐deposited bioactive glass coatings . The mechanism of apatite formation in bioactive glass is described by Hench in four stages, as discussed previously.…”

“…Such dissolutions are reported earlier through pulse laser-deposited bioactive glass coatings. [43][44][45][46][47] The mechanism of apatite formation in bioactive glass is described by Hench 8 in four stages, as discussed previously. The increase in apatite formation is evident from the epifluorescence micrographs which show an increase in green fluorescence with exposure time.…”

Controlled release of drugs in electrosprayed nanoparticles for bone tissue engineering

“…The biodegradable Gel-P-BCP composite material had well defined interconnected pores which facilitates osteoconductivity and promotes cell adhesion, proliferation and viability for bone tissue formation[54].Bioactive glass (BG) scaffolds are interesting candidates currently employed in bone tissue restoration owing to their osteoconductivity, osteoinductivity and bone bonding ability. BGs are generally used as bioactive coating material on orthopedic implants, dental applications, bone filling materials and small bone implants[55][56][57]. In a recent study, selenium (Se) nanoparticles showed a significant role in the modulation of cell proliferation, antioxidant protection and enhanced immune surveillance.…”

Hierarchically Designed Bioactive Glassy Nanocoatings for the Growth of Faster and Uniformly Dense Apatite

“…It is noteworthy here that typically cracks, poor densification and lack of adhesion can be observed in the bioactive glass coating due to the thermal stress or irregular interparticle spacing problems . The morphology of sol–gel derived bioactive glasses affects their bioactivity, expressed as osteoconductivity, and tissue attachment properties .…”

“…This apatite layer being chemically similar with the mineral phase of the natural bone promotes bonding between the bioactive glass and the soft as well as hard tissues of the host . Accordingly, bioactive glass coatings on inert implants (e.g., inert glass reinforced bone implants) facilitate bonding between the implant and the surrounding tissue . Coatings can also help to maintain mechanical durability of the implant for longer period .…”