The Effect of the Two‐Step Sintering Process on Consolidation of Fluoridated Hydroxyapatite and its Mechanical Properties and Bioactivity

Abstract

The aim of this work was to evaluate the effect of the two‐step sintering process on consolidation of fluoridated hydroxyapatite (FHA). In addition, the effect of fluorine content on sinterability, mechanical properties, and bioactivity of FHA bulks was studied. Nanostructured FHA bulks were obtained under the conditions of 1000 and 900°C for the initial and secondary temperatures, respectively, without any structural decomposition. In addition, by increasing the fluorine content, the sinterability of FHA bulks was decreased and the hardness of FHA bulks was improved. Moreover, FHA bulks showed acceptable bioactivity.

Effect of Electrodeposition Parameters on the Microstructure and Corrosion Behavior of ‎DCPD Coatings on Biodegradable Mg–Ca–Zn Alloy

“…This result is in good agreement with a published work by Djosic et al . As the deposition kinetic improved as a result of high current density, the fast deposition of particles prevented the formation of a uniform coating layer and ‎therefore large pores formed in the deposited film with high surface roughness.‎ The bonding strength of the coating at 0.15, 0.25, and 0.4 mA/cm 2 was around 16.4, 15.7, and 15.3 MPa, respectively, which is in accordance with required norms (15 MPa) in orthopedic implant industry . However, bonding strength of coated specimens at 0.8 and 1.2 mA/cm 2 was around 14.6 and 12.2 MPa, respectively.…”

“…Among these, hydroxyapatite (HA, Ca 10 (PO 4 ) 6 (OH) 2 ) is the most fascinating form of Ca‐P due to the its excellent biocompatibility, bioaffinity, and osseoconductivity . HA also has similar chemical and biological properties to human ‎hard tissues as well as HA coating improved corrosion resistance of Mg alloys in biological environment by providing barrier film on the alloy surface . However, the synthesis of HA via precipitation method leads to the formation of agglomerate crystals whose size is often difficult to control .…”

Comparative study of hydroxyapatite, fluor-hydroxyapatite and Si-substituted hydroxyapatite nanoparticles on osteogenic, osteoclastic and antibacterial ability

“…47 To better understand the application of HA, FHA and SiHA nanoparticles, we compared the osteoclastic activity, antibacterial abilities and the in vitro and in vivo osteogenesis of the three materials. We fabricated HA, FHA and SiHA using the sol-gel method, 48 and analysed by SEM, TEM, XRD and XPS assay. The SEM results showed that all three nanoparticles had rod-like particles with approximate lengths of 200 nm, 700 nm and 450 nm for HA, FHA and SiHA, respectively.…”

Calcium Orthophosphate-Based Bioceramics

“…The method consists of suppressing grain boundary migration responsible for grain growth, while keeping grain boundary diffusion that promotes densification. The TSS approach was successfully applied to calcium orthophosphate bioceramics [ 107 , 290 , 291 , 292 , 293 ]. For example, HA compacts prepared from nanodimensional powders were two-step sintered.…”