Synthesis and characteristics of sol-gel bioactive SiO2-P2O5-CaO-Ag2O glasses
74
Citation
50
Reference
10
Related Paper
Citation Trend
Keywords:
Simulated body fluid
Bioactive Glass
Thermogravimetric analysis
Simulated body fluid
Bioactive Glass
Cite
Citations (8)
Kokubo's simulated body fluid (SBF) has been extensively used for screening to distinguish bioactive materials. The present study examined the effects of organic acids and albumin in the SBF on apatite formation on glass and titanium substrates. Titanium substrates were subject to a H 2 O 2 treatment and subsequent heating to prepare bioactive titania layers. Apatite formation was then examined after soaking the substrates in both SBF and modified SBF containing organic components such as succinic acid, tartaric acid, citric acid and albumin. Calcium-chelate formation due to the organics reduced free calcium ion concentration. The induction time of apatite nucleation on the titania surface was delayed in SBF containing the organic acids. The reduction in the free calcium ion concentration suppressed the apatite nucleation.
Simulated body fluid
Bioactive Glass
Tartaric acid
Cite
Citations (0)
Most bone-bonding bioactive materials form bone-like apatite on their surfaces after being implanted into the living body, and bond to neighboring bone through this apatite layer. The apatite layer can be reproduced on the surfaces of materials in an organic-substance-free acellular simulated body fluid (SBF) with ion concentrations almost equal to those of human blood plasma. The bone-bonding ability of a material is often evaluated by examining the ability of apatite to form on the material in SBF. In this chapter, the validity of this method for evaluating the bone-bonding bioactivity of a material, the ion concentrations of SBF, the materials able to form apatite, the characteristics of apatite, the bone-bonding mechanisms of bioactive materials, and the mechanisms of apatite formation, are reviewed.
Simulated body fluid
Cite
Citations (67)
Revised simulated body fluid (R–SBF) has ion concentrations, including those of CI and HCO3, equal to those of human blood plasma. A glass with composition in weight percent of SiO2 50%, Na2O 26% and CaO 24% was soaked in both conventional simulated body fluid (C–SBF) and R–SBF. Glass surface was studied by XRD, SEM in order to compare the apatite formation behaviors in two conditions. Results show that in both cases apatite formed on the glasses surfaces but it takes a longer time to form apatite on the glass surface in R–SBF than that in C–SBF. Calcite was identified on the surface of glasses after they were soaked in R–SBF after 1 day, but was never identified on glass surface in C–SBF. It shows a different apatite formation process in R–SBF as compared with that in C–SBF as calcite introduces apatite formation in R–SBF.
Simulated body fluid
Cite
Citations (3)
Simulated body fluid
Bioactive Glass
Cite
Citations (1)
Abstract The inhibitive effects of serum proteins on apatite growth was compared between melt-derived 45S5 Bioglass ® and sol-gel derived bioactive glass of the 70S30C (70 mol% SiO 2 , 30 mol% CaO). By using techniques of XRD, TEM and Raman spectroscopy, the transformation of amorphous calcium phosphate to crystalline apatite, and the resulting size and aspect ratio of the crystals, in simulated body fluid (SBF), was seen to decrease in the presence of serum. XRD showed more rapid HA formation on Bioglass particles, compared to that forming on 70S30C particles, however TEM showed similar size and frequency of the needle-like crystals. Phosphate reduction in SBF was similar for Bioglass and 70S30C. Calcium carbonate formation was more likely on the phosphate-free sol-gel glass than on Bioglass.
Simulated body fluid
Bioactive Glass
Amorphous calcium phosphate
Phosphate glass
Cite
Citations (13)
Commercially pure titanium (c.p.Ti) is capable of inducing the formation of a carbonated apatite onto its surface in a simulated body fluid (SBF) comprised of calcium ions, phosphate ions, and other inorganic species present in the body fluid. In addition to the incorporation of carbonate ions, such formed apatite has other important characteristics of the bone mineral phase, such as a small crystal size and ionic substitution by Mg2+ and Cl−. Thus, we call this apatite a quasi-biological apatite. The formation of the quasi-biological apatite is proposed to be related to TiOH groups that develop on the titanium surface through interaction with the SBF. The results suggest that titanium implants may be activated such that they can form a strong bond with bone tissue through the in vivo formation of apatite. Since the solution can reach any open space, the process discussed in this study is very suitable for coating porous titanium implants with a quasi-biological apatite film. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res, 41, 341–348, 1998.
Simulated body fluid
Cite
Citations (146)
Commercially pure titanium (c.p.Ti) is capable of inducing the formation of a carbonated apatite onto its surface in a simulated body fluid (SBF) comprised of calcium ions, phosphate ions, and other inorganic species present in the body fluid. In addition to the incorporation of carbonate ions, such formed apatite has other important characteristics of the bone mineral phase, such as a small crystal size and ionic substitution by Mg2+ and Cl−. Thus, we call this apatite a quasi-biological apatite. The formation of the quasi-biological apatite is proposed to be related to TiOH groups that develop on the titanium surface through interaction with the SBF. The results suggest that titanium implants may be activated such that they can form a strong bond with bone tissue through the in vivo formation of apatite. Since the solution can reach any open space, the process discussed in this study is very suitable for coating porous titanium implants with a quasi-biological apatite film. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res, 41, 341–348, 1998.
Simulated body fluid
Cite
Citations (10)
Formation of bonelike apatite on zirconia gel in a simulated body fluid (SBF) with ion concentrations almost equal to those in human blood plasma, in modified SBF solutions to have increased pH values, and modified SBF solutions to have increased concentrations of calcium and phosphate ions has been investigated. The zirconia gel forms apatite on its surface in SBF, indicating that Zr‐OH groups, abundant on the gel, act as effective apatite nucleation centers. Apatite formation is accelerated by increases in pH and in the concentration of calcium and phosphate ions, which is explained by an increase in the ionic activity product of the apatite in the SBF. These results suggest that zirconia ceramics may exhibit a bone‐bonding ability by forming an apatite layer on their surfaces in the living body when they are modified to have many Zr‐OH groups on their surfaces.
Simulated body fluid
Cite
Citations (151)
Bioactivity analysis in simulated body fluid (SBF) is an experiment or protocol conducted to evaluate the bioactive properties of a sample without involving cells. The bioactive property is claimed based on the formation of apatite layer after immersion in SBF. This analysis consumes expensive chemical reagents and requires complex procedure in preparing and refreshing the solution. Therefore, the aim of this study was to identify significant alteration of refreshing time in the 1.5× SBF to form an apatite layer on a polydopamine (PDA) grafted stainless steel (SS316L) disk. The SS316L disks were pre-treated and grafted with a PDA layer to equip the bioinert metal surface with a bioactive film. The PDA grafted disks were subjected to bioactivity analysis in SBF for 7 days at different refreshing time (24 h, 48 h, 72 h and not refreshed up to 7 d). The surfaces were then characterised by FTIR, SEM-EDX, and contact angle analyses to determine its chemical composition, morphology and wettability properties. The PDA grafted disks that been subjected to 48 h refreshing time in SBF produced homogenous apatite formation with less agglomeration, closest theoretical Ca/P ratio and high hydrophilicity, suggesting the formation of preferable apatite layer with a reduction in the number of refreshing time.Bioactivity analysis in simulated body fluid (SBF) is an experiment or protocol conducted to evaluate the bioactive properties of a sample without involving cells. The bioactive property is claimed based on the formation of apatite layer after immersion in SBF. This analysis consumes expensive chemical reagents and requires complex procedure in preparing and refreshing the solution. Therefore, the aim of this study was to identify significant alteration of refreshing time in the 1.5× SBF to form an apatite layer on a polydopamine (PDA) grafted stainless steel (SS316L) disk. The SS316L disks were pre-treated and grafted with a PDA layer to equip the bioinert metal surface with a bioactive film. The PDA grafted disks were subjected to bioactivity analysis in SBF for 7 days at different refreshing time (24 h, 48 h, 72 h and not refreshed up to 7 d). The surfaces were then characterised by FTIR, SEM-EDX, and contact angle analyses to determine its chemical composition, morphology and wettability properties. The PDA grafted disks that been subjected to 48 h refreshing time in SBF produced homogenous apatite formation with less agglomeration, closest theoretical Ca/P ratio and high hydrophilicity, suggesting the formation of preferable apatite layer with a reduction in the number of refreshing time.
Simulated body fluid
Bioactive Glass
Immersion
Cite
Citations (1)