Preparation of mica-based glass-ceramics with needle-like fluorapatite

Xiang, Qijun; Liu, Yong; Sheng, Xia; Dan, Xiaohong

doi:10.1016/j.dental.2006.10.008

Cited by 45 publications

(21 citation statements)

References 23 publications

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“…2,3 The properties of these materials strongly depend on the morphology of the crystalline phases existing in the material. 3 For example, glass-ceramics containing orientated or needle-like apatite represent high strength and fracture toughness, 4,5 and mica crystals with conventional house of cards structure would improve the machinability of these materials. 3 Additionally, mica-apatite glass-ceramics containing calcium mica crystals, demonstrate better mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Processing and properties of a mica–apatite glass–ceramic reinforced with Y-PSZ particles

Montazerian

Alizadeh

Yekta

2008

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Processing and properties of a mica–apatite glass–ceramic reinforced with Y-PSZ particles

Montazerian

Alizadeh

Yekta

2008

Journal of the European Ceramic Society

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“…ZIR is a ceramic whose microstructure is primarily amorphous with little evidence of crystalline phase by fluorapatite crystals 26 . According to some authors, the higher content of needle-like fluorapatite crystals increases Vickers microhardness and fracture toughness 27 . Then, high fracture toughness of this ceramic is attributed to its fluorapatite crystals, that measure 100nm by 300nm and 300nm by 2 to 5 micrometer, as manufacturer provides.…”

Section: Discussionmentioning

confidence: 99%

Fracture toughness of three heat pressed ceramic systems

et al. 2018

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Aim: The aim of this study was to evaluate fracture toughness by indentation method of three dental ceramics processed by heat pressing. The ceramics evaluated were fluorapatite glass ceramic (ZIR), glass ceramic containing leucite (POM) and leucite-reinforced glass ceramic (EMP). Materials and methods: Ninety disks (13mm of diameter x 4mm of thickness) and nine rectangular specimens (25x4x2mm) were made to evaluate, respectively, microhardness/fracture toughness (n=30) and elastic modulus (n=3). Samples were obtained by pressing ceramic into refractory molds. After polishing, Vickers microhardness was evaluated under 4,904N load for 20s. Elastic modulus was measured by impulse excitation technique. Data from microhardness and elastic modulus were used to calculate fracture toughness, after measuring crack length under 19,6N load applied for 20s. Results were evaluated by ANOVA and Tukey´s test. Results: Microhardness (VHN) of POM (637.9±53.6) was statistically greater (p<0.05) than ZIR (593.0±14. The results suggest that fluorapatite glass ceramic (ZIR) and leucite-reinforced glass ceramic (EMP) processed by heat pressing presented greater fracture toughness, improving clinical prognosis of metal free restorations.

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“…[5] FHA has attracted much attention as a promising material to replace hydroxyapatite (HA) in biomedical bone scaffolding applications, especially when excellent integration in bone/tissue interface and long-term performance of the implant are needed. [8] In the last decade, some studies were extended to the synthesis of solid solution FHA to be used in the form of powder, [9] composite, [10,13] tissue engineering scaffold, [11] or surface coating [12] on various orthopaedic prostheses and dental implants. Fluorine plays a significant role in stimulating bone-derived cellular activity [13] and enhancing bone union in vivo.…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel Derived Nanocrystalline Fluoridated Hydroxyapatite Powders and Nanostructured Coatings for Tissue Engineering Applications

Zahrani

Fathi

Alfantazi

2010

Metall Mater Trans A

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Nanocrystalline fluoridated hydroxyapatite (FHA) powders and coatings with a chemical composition of Ca 10 (PO 4 ) 6 OH 2-x F x (where x values were selected equal to 0.0 ,0.5, 1.0, 1.5, and 2.0) were prepared through a modified simple sol-gel technique in comparison with conventional alkoxide-based sol-gel route. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), fourier transform infrared (FTIR) spectroscopy, pF-meter with a fluorine-sensitive electrode, and inductively coupled plasma-optical emission spectroscopy (ICP-OES) analysis techniques were employed in order to evaluate phase composition, particle size distribution, morphology, functional groups, fluorine content, and purity of prepared FHA nanopowders, respectively. SEM analysis was used to study the surface morphology and cross section of the FHA coatings, deposited on 316L stainless steel substrate. Results indicated that single-phase and homogeneous FHA nanopowders with carbonate peaks in the FTIR spectrum were synthesized through the modified sol-gel technique. TEM analysis revealed that fluorapatite (FA) powder was composed of nanosized particles,~25 nm in size, with polyhedron shape and straight corners. In the modified sol-gel technique, polymerization and gelation kinetic of the sol were significantly improved without any need to use additives or pH control. Uniform, dense, well-adhered, and compacted FHA coatings were formed on the 316L stainless steel substrate after 24 hours of aging.

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Preparation of mica-based glass-ceramics with needle-like fluorapatite

Cited by 45 publications

References 23 publications

Processing and properties of a mica–apatite glass–ceramic reinforced with Y-PSZ particles

Processing and properties of a mica–apatite glass–ceramic reinforced with Y-PSZ particles

Fracture toughness of three heat pressed ceramic systems

Sol-Gel Derived Nanocrystalline Fluoridated Hydroxyapatite Powders and Nanostructured Coatings for Tissue Engineering Applications

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