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Start Over Descriptor "Bioactive glass coatings" Journal journal of the mechanical behavior of biomedical materials
2 results on '"Bioactive glass coatings"'

1. 3D analysis of thermal and stress evolution during laser cladding of bioactive glass coatings.

Author

Krzyzanowski, Michal, Bajda, Szymon, Liu, Yijun, Triantaphyllou, Andrew, Mark Rainforth, W., and Glendenning, Malcolm

Subjects
OPTICAL fiber cladding, BIOACTIVE glasses, SURFACE coatings, FINITE element method, OPTICAL susceptibility
Abstract

Thermal and strain–stress transient fields during laser cladding of bioactive glass coatings on the Ti6Al4V alloy basement were numerically calculated and analysed. Conditions leading to micro-cracking susceptibility of the coating have been investigated using the finite element based modelling supported by experimental results of microscopic investigation of the sample coatings. Consecutive temperature and stress peaks are developed within the cladded material as a result of the laser beam moving along the complex trajectory, which can lead to micro-cracking. The preheated to 500 °C base plate allowed for decrease of the laser power and lowering of the cooling speed between the consecutive temperature peaks contributing in such way to achievement of lower cracking susceptibility. The cooling rate during cladding of the second and the third layer was lower than during cladding of the first one, in such way, contributing towards improvement of cracking resistance of the subsequent layers due to progressive accumulation of heat over the process. [ABSTRACT FROM AUTHOR]

Published
2016
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2. Superior biofunctionality of dental implant fixtures uniformly coated with durable bioglass films by magnetron sputtering

Author

George E. Stan, Monica Enculescu, Cristiana Tanase, A.C. Popa, D.U. Tulyaganov, and José M.F. Ferreira

Subjects
Ceramics, 45S5 BIOGLASS(R)-BASED SCAFFOLDS, Materials science, SURFACE, Biocompatibility, Radio Waves, Swine, medicine.medical_treatment, Biomedical Engineering, Biocompatible Materials, ADHESION, engineering.material, OSSEOINTEGRATION, Osseointegration, law.invention, Biomaterials, THIN-FILMS, Coating, law, Dental pulp stem cells, medicine, Animals, Humans, Dental implant, Mechanical Phenomena, Dental Implants, Stem Cells, HEAT-TREATMENT, Cell Differentiation, BIOACTIVE GLASS COATINGS, Sputter deposition, HYDROXYAPATITE, Magnetic Fields, Mechanics of Materials, Bioactive glass, engineering, Implant, BONE, SYSTEM, Biomedical engineering
Abstract

Bioactive glasses are currently considered the suitable candidates to stir the quest for a new generation of osseous implants with superior biological/functional performance. In congruence with this vision, this contribution aims to introduce a reliable technological recipe for coating fairly complex 3D-shaped implants (e.g. dental screws) with uniform and mechanical resistant bioactive glass films by the radio-frequency magnetron sputtering method. The mechanical reliability of the bioactive glass films applied to real Ti dental implant fixtures has been evaluated by a procedure comprised of \"cold\" implantation in pig mandibular bone from a dead animal, followed by immediate tension-free extraction tests. The effects of the complex mechanical strains occurring during implantation were analysed by scanning electron microscopy coupled with electron dispersive spectroscopy. Extensive biocompatibility assays (MTS, immunofluorescence, Western blot) revealed that the bioactive glass films stimulated strong cellular adhesion and proliferation of human dental pulp stem cells, without promoting their differentiation. The ability of the implant coatings to conserve a healthy stem cell pool is promising to further endorse the fabrication of new osseointegration implant designs with extended lifetime. (C) 2015 Elsevier Ltd. All rights reserved.

Published
2015

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