Synthesis of Co-Cr-Mo Fluorapatite Nano-Composite Coatings by Pulsed Laser Deposition for Dental Applications

Abstract

Aim: The study was to fabricate FA nanopowder/Co-Cr-Mo dental alloy nanocomposite using pulsed laser deposition (PLD), and to evaluate bioactivity properties on simulated body fluid. Methods: In this work, the FA nanopowder was prepared by mixing calcium hydroxide (Ca(OH) 2 ), phosphorouspent oxide (P 2 O 5 ) and calcium fluoride (CaF 2 ) in a planetary high energy ball mill using zirconium vial. Fluorapatite (FA) nanopowder was processed in the form of pellet for pulsed laser deposition process. The Co-Cr-Mo alloy was coated with FA nanopowder which was approximately 35 -65 nm at various laser energy, pressure and time. The X-ray diffraction (XRD) was used to analyze phase, crystallinity and size distribution of Co-Cr-Mo/FA nanocomposite. The surface analysis was by scanning electron microscopy (SEM), Atomic Force microscopy (AFM) and Energy dispersive spectroscopy (EDS). Results: From the results obtained, It was shown that FA nanopowder deposited on Co-CrMo alloy was stable during 14 days of incubation on simulated body fluid. It was also observed that the FA nanopowder coated on the surface of the alloy was still intact after the deposition process, which indicated the bioactivity and biocompatibility of the material. Conclusions: The fabrication of FA nanocomposite based dental alloys (Co-Cr-Mo) using PLD was done successfully. This was confirmed by various characterization techniques, which included XRD, AFM, SEM and EDS.

Formation of a Calcium Phosphate Layer with Immobilized Cobalt Chromite Nanoparticles on Cobalt−Chromium Alloy by a Laser-Assisted Biomimetic Process

“…Therefore, CaP was precipitated heterogeneously at the laser-irradiated substrate surface without the sedimentation of homogeneously precipitated CaP particles. The use of a liquid CaP source (CP solution) makes the LAB process different from other laser-assisted CaP coating techniques, such as pulsed laser deposition [9] and laser-assisted powder fusion [10], both of which use solid CaP sources. A comparison with a non-irradiated surface of the LAB-processed (30 min) substrate revealed that the CaP coating was confined to the laser-irradiated surface; the non-irradiated surface was not affected, even in the same substrate (Figure 2c), which indicates the essential role of laser irradiation to induce CaP precipitation on the Co−Cr alloy substrate.…”

“…However, Co−Cr alloys are categorized as bioinert materials; their osteoconductivity is insufficient compared to osteoconductive CaP compounds [4]. To remedy this shortcoming, various CaP coating techniques, such as plasma spraying [5], hot isostatic pressing [6], pressing/heating process [7], electrophoresis [8], pulsed laser deposition [9], laser-assisted powder fusion [10] and biomimetic process (supersaturated solution process) [11], have been applied to Co−Cr alloys.…”