Effect of AlTiO Content and Sintering Temperature on the Microstructure and Residual Stress of AlO-AlTiO Ceramic Composites.

A series of AlO-AlTiO ceramic composites with different AlTiO contents (10 and 40 vol.%) fabricated at different sintering temperatures (1450 and 1550 °C) was studied in the present work. The microstructure, crystallite structure, and through-thickness residual stress of these composites were investigated by scanning electron microscopy, X-ray diffraction, time-of-flight neutron diffraction, and Rietveld analysis.

Mechanical properties of zirconia ceramics biomimetically coated with calcium deficient hydroxyapatite.

Mechanical properties and stability of porous tetragonal yttria-stabilised zirconia (Y-TZ) ceramics, biomimetically coated with calcium deficient hydroxyapatite (CaDHA) to obtain a bioactive material, were investigated. The 5.7 mol% yttria-stabilised tetragonal zirconia was obtained by sol-gel process and sintered at different temperatures to obtain a homogeneous and porous structure whose strength would match that of human bone.

Diopside-tricalcium phosphate bioactive ceramics for osteogenic differentiation of human adipose stem cells.

Ti scaffolds combined with autologous human adipose-derived mesenchymal stem cells (hASCs) have been successfully applied for regenerative cranio-maxillofacial bone therapies. Future challenges reside in regeneration of larger bone defects and displacement of the permanent Ti structure, thus, advanced resorbable scaffolds are needed. Composites of β-Ca (PO ) with 80 and 60 wt % of CaMg(SiO ) with improved mechanical properties compared to tricalcium phosphate (TCP) materials are presented.

Effect of graphene on setting and mechanical behaviour of tricalcium phosphate bioactive cements.

The potential reinforcing effect of graphene on calcium phosphate cements (CPCs) for injectable bone substitutes and scaffolds is presented. The influence of graphene (0-3.84 vol%) on the microstructural development during setting and the resultant mechanical properties of CPCs constituted by α + β-tricalcium phosphate is analysed.

In vitro study of the proliferation and growth of human fetal osteoblasts on Mg and Si co-substituted tricalcium phosphate ceramics.

The objective of this work was to study the feasibility of the solid state sintering, a conventional ceramic processing method, to obtain Mg and Si co-substituted tricalcium phosphate bioceramics and composites containing diopside. A series of new Ca (PO ) based ceramics has been prepared from attrition milled mixtures of synthetic Ca (PO ) and CaMg(SiO ) powders, isostatically pressed and sintered at 1250-1300°C. Materials containing 0, 1, and 5 wt % of CaMg(SiO ) were constituted by β + α - Ca (PO ) solid solutions while the material containing 60 wt % of CaMg(SiO ) was a constituted by β- Ca (PO ) and CaMg(SiO ) .

Bone neoformation of a novel porous resorbable Si-Ca-P-based ceramic with osteoconductive properties: physical and mechanical characterization, histological and histomorphometric study.

Objective: The aims of the present work were to study a new porous Nurse's A ceramic (Si-Ca-P-based material) bone substitute and examine its mechanical properties in vitro and the biocompatibility, osteoconductivity and resorption process in vivo.

Materials And Method: Porous ceramic scaffolds were prepared by solid-state reaction and implanted in critical-sized defect created in 15 NZ rabbits. Strength values were determined by the diametrical compression of disk test.

Effect of Mg and Si co-substitution on microstructure and strength of tricalcium phosphate ceramics.

Magnesium and silicon co-doped tricalcium phosphate (TCP) ceramics with compositions corresponding to 0, 5 and 10wt% CaMg(SiO3)2 in the system Ca3(PO4)2-CaMg(SiO3)2 were obtained by conventional sintering of compacted mixtures of Ca3(PO4)2, MgO, SiO2 and CaCO3 powders at temperatures between 1100 and 1450°C. Microstructural analyses were performed by X-ray diffraction and field emission scanning electron microscopy with energy dispersive spectroscopy. Major phases in the obtained ceramics were β- or α+β-tricalcium phosphate containing Mg and Si in solid solution.

Work of fracture of a composite resin: fracture-toughening mechanisms.

The aim of this work was to investigate those mechanical parameters able to describe the fracture behavior of dental composite resins. A commercially available fine-particle micro-hybrid resin composite was used. Classical parameters as Young's modulus, strength distribution, and critical stress intensity factor were considered.