In vitro bioactivity evaluation, mechanical properties and microstructural characterization of Na₂O-CaO-B₂O₃-P₂O₅ glasses.
Na2O-CaO-B2O3-P2O5 glasses have been prepared by the melt-quenching method. B2O3 content was systematically increased from 5 to 30 mol%, at the expense of P2O5, in the chemical composition of these glasses. Density, Vickers microhardness and fracture toughness of the prepared glasses were measured. In vitro bioactivity of the glasses was assessed by soaking in the simulated body fluid (SBF) at 37±0.5°C for 3, 7, 14 and 30 days. The glasses were tested in the form of glass grains as well as bulk slabs. The structure and composition of the solid reaction products were analyzed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS). The kinetics of degradation of the glass particles were monitored by measuring the weight loss of the particles and the ionic concentration of Ca, P and B in the SBF solution using inductive coupled plasma-atomic emission spectroscopy (ICP-AES). The obtained results revealed the formation of a bioactive hydroxyapatite (HA) layer, composed of nano-crystallites, on the surface of glass grains after the in vitro assays. The results have been used to understand the formation of HA as a function of glass composition and soaking time in the SBF. It can be pointed out that increasing B2O3 content in glass composition enhances the bioactivity of glasses. The nanometric particle size of the formed HA and in vitro bioactivity of the studied glasses make them possible candidates for tissue engineering application.
Glass Research Department, National Research Centre (NRC), El-behoos Str., Dokki, 12622 Cairo, Egypt. Electronic address: sheriefabonaf@yahoo.com.
Sherief M
SM
Abo-Naf
Spectroscopy Department, National Research Centre (NRC), El-behoos Str., Dokki, 12622 Cairo, Egypt.
El-Sayed M
el-SM
Khalil
Physics Department, Faculty of Science, Ain-Shams University, Cairo, Egypt.
El-Sayed M
el-SM
El-Sayed
Physics Department, Faculty of Girls, Ain-Shams University, Cairo, Egypt.
Hamdia A
HA
Zayed
Spectroscopy Department, National Research Centre (NRC), El-behoos Str., Dokki, 12622 Cairo, Egypt.
Rasha A
RA
Youness
D001672:Biocompatible Materials / Q000737:chemistry* / Q000494:pharmacology*; D001826:Body Fluids / Q000737:chemistry; D001896:Boron Compounds / Q000737:chemistry* / Q000494:pharmacology*; D005898:Glass / Q000737:chemistry*; D006244:Hardness; D008422:Materials Testing; D055595:Mechanical Phenomena; D046529:Microscopy, Electron, Transmission; D008970:Molecular Weight; D013052:Spectrometry, X-Ray Emission; D013054:Spectrophotometry, Atomic; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
D001672:Biocompatible Materials; D001896:Boron Compounds; C118163:sodium oxide-calcium oxide-diphosphorus pentoxide glass; C042168:boron oxide
Bioactive glass; FTIR; ICP; In vitro bioactivity; TEM; XRD