Journal ArticleDOI
Hydroxyapatite/Hydroxyapatite‐Whisker Composites without Sintering Additives: Mechanical Properties and Microstructural Evolution
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TLDR
In this paper, the authors used pressureless sintering, hot pressing, and hot isostatic pressing (HIP) to obtain a fracture toughness of 1.4-2.0 MPam1/2.Abstract:
Hydroxyapatite/0%-30% hydroxyapatite-whisker (HAp/0%-30%HAp(w)) composites have been fabricated by pressureless sintering, hot pressing, and hot isostatic pressing (HIP). Composites that were HIPed at 1000°-1100°C (2 h, 190 MPa) exhibited the best properties: relative densities of 97.0-99.5%, fracture toughness of 1.4-2.0 MPa·m1/2 (as compared with 1.0 MPam1/2 for the nonreinforced HAp matrix). Compressive pre-stressing and crack deflection contributed mostly to the increase of fracture toughness. Depending on processing conditions, grain growth in the HAp matrix and/or Rayleigh instability of the HAp whiskers were probably responsible for microstructural changes in the composites. The HAp/HAp(w) composites exhibited improved toughness, attaining the lower fracture-toughness limit of bone without a decrease of bioactivity and biocompatibility.read more
Citations
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The influence of pH and temperature on the morphology of hydroxyapatite synthesized by hydrothermal method
TL;DR: In this paper, the authors synthesize hydroxyapatite (HA) whiskers and crystals by hydrothermal treatment of Ca(OH) 2 and CaHPO 4 ·2H 2 O.
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Calcium Orthophosphate-Based Biocomposites and Hybrid Biomaterials
TL;DR: The state-of-the-art of calcium orthophosphate-based biocomposites and hybrid biomaterials suitable for biomedical applications is presented and the critical issues and scientific challenges that require further research and development are examined.
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Calcium Orthophosphate-Based Bioceramics
TL;DR: Current biomedical applications of calcium orthophosphate bioceramics include bone augmentations, artificial bone grafts, maxillofacial reconstruction, spinal fusion, periodontal disease repairs and bone fillers after tumor surgery.
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Hydrothermal synthesis of hydroxyapatite nanopowders using cationic surfactant as a template
TL;DR: In this article, the cationic surfactant CTAB as a template is used to regulate the nucleation and crystal growth of hydroxyapatite (HAp) nanoparticles.
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Calcium Orthophosphates as Bioceramics: State of the Art
TL;DR: A review of bioceramics prepared from calcium orthophosphates can be found in this paper, which belongs to the categories of bioactive and bioresorbable compounds.
References
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Bioceramics: From Concept to Clinic
TL;DR: The mechanisms of tissue bonding to bioactive ceramics are beginning to be understood, which can result in the molecular design of bioceramics for interfacial bonding with hard and soft tissues.
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Evaluation ofKIc of brittle solids by the indentation method with low crack-to-indent ratios
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Biodegradation behavior of various calcium-phosphate materials in bone tissue
TL;DR: Sintered tricalciumphosphate (beta-whitlockite) materials were more or less biodegradable, in contrast to sintered hydroxyapatite materials, which showed no detectable resorption over a period of 9 months of implantation.