Densification additives for hydroxyapatite ceramics

Сафронова, Т. В.; Putlyaev, V. I.; Shekhirev, Mikhail; Tret’yakov, Yu. D.; Kuznetsov, A. V.; Belyakov, A. V.

doi:10.1016/j.jeurceramsoc.2008.12.012

Cited by 30 publications

(21 citation statements)

References 18 publications

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“…In the literature, different dilatometric curves were reported for HAP compacts. Several authors reported that HAP begins to be sintered at the temperatures between 700 and 800 °C, and several sintering temperatures between 1050 and 1250 °C were suggested by combining the dilatometric analysis with other characterization studies . Zhang et al reported that large shrinkage in the temperature range of 1000–1200 °C corresponds to a higher sintering rate, followed by a soaking period at 1250 °C where densification proceeded with a very slow sintering rate.…”

Section: Resultsmentioning

confidence: 99%

Effect of HAP decomposition on the corrosion behavior of Ti–HAP biocomposites

Toptan

Alves

Ferreira

et al. 2018

Materials & Corrosion

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Ti–HAP biocomposites are gained attention for combining the attractive properties of Ti and hydroxyapatite (HAP). However, the decomposition of HAP at elevated processing temperatures is a major concern since it can lead to structural flaws and may deteriorate the corrosion resistance of Ti. The present study aims to investigate the corrosion behavior of Ti–HAP composite processed by powder metallurgy by performing potentiodynamic polarization and electrochemical impedance spectroscopy in 0.9 wt% NaCl solution at body temperature. Results show that the presence of Ti lowers the HAP decomposition temperatures resulting in the formation of HAP‐depleted zones acting as electrochemically active sites, decreasing the corrosion resistance.

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Section: Resultsmentioning

confidence: 99%

Effect of HAP decomposition on the corrosion behavior of Ti–HAP biocomposites

Toptan

Alves

Ferreira

et al. 2018

Materials & Corrosion

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“…The degree of densification appeared to depend on the sintering temperature whereas the degree of ionic diffusion was governed by the period of sintering [288]. To enhance sinterability of CaPO 4 , a variety of sintering additives might be added [289][290][291][292]. Lithography was used to print a polymeric material, followed by packing with HA and sintering [471].…”

Section: Sintering and Firingmentioning

confidence: 99%

Calcium Orthophosphate (CaPO4) Scaffolds for Bone Tissue Engineering Applications

Dorozhkin¹

2018

JBBS

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The chemical and structural similarities of calcium orthophosphates (abbreviated as CaPO4)to the mineral composition of natural bones and teeth have made them a good candidate for bone tissue engineering applications. Nowadays, a variety of natural or synthetic CaPO4-based biomaterials is produced and has been extensively used for dental and orthopedic applications. Despite their inherent brittleness, CaPO4 materials possess several appealing characteristics as scaffold materials. Namely, their biocompatibility and variable stoichiometry, thus surface charge density, functionality and dissolution properties, make them suitable for both drug and growth factor delivery. Therefore, CaPO4, especially hydroxyapatite (HA) and tricalcium phosphates (TCPs), have attracted a significant interest in simultaneous use as bone grafts and drug delivery vehicles. Namely, CaPO4-based three-dimensional (3D) scaffolds and/or carriers have been designed to induce bone formation and vascularization. These scaffolds are usually porous and harbor various types of drugs, biologically active molecules and/or cells. Over the past few decades, their application as bone grafts in combination with stem cells has gained much importance. This review discusses the source, manufacturing methods and advantages of using CaPO4 scaffolds for bone tissue engineering applications. Perspective future applications comprise drug delivery and tissue engineering purposes.

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“…This has been demonstrated in several cases for composites with silica nano-particles. [24][25] An additional contributing mechanism may involve homogenization of the stress field as described in work by Zhang et al 26 Zhang and co-authors describe how the use of multiscale ceramic fillers (i.e., both nano and micro fillers) may work synergistically to improve mechanical properties. Moreover, our approach, like that of others, 27 involves novel means of incorporating nanostructures and nanoparticles into materials for bio-related applications.…”

Section: Scratch and Abrasion Properties Of Polyurethane-based Micro-mentioning

confidence: 99%

Scratch and Abrasion Properties of Polyurethane-Based Micro- and Nano-Hybrid Obturation Materials

Estévez¹,

Rodríguez²,

Vargas³

et al. 2013

j nanosci nanotechnol

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Polyurethane-based micro- and nano-hybrid composites were produced with controlled porosity to be used as obturation materials. In addition to hydroxyapatite (HAp) micro-particles in the composites, two different ceramics particle types were also added: alumina micro-particles and silica nano-particles. Particles of different sizes provide the materials with improved mechanical properties: the use of micro- and nano-particles produces a better packing because the nano-particles fill the interstitial space left by the micro-particles, rendering an improvement in the mechanical properties. The silica and alumina particles provide the materials with appropriate abrasion and scratching properties, while the HAp provides the required bio-acceptance. The polymeric matrix was a mono-component solvent-free polyurethane. The porosity was selected by controlling the chemical reaction.

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Densification additives for hydroxyapatite ceramics

Cited by 30 publications

References 18 publications

Effect of HAP decomposition on the corrosion behavior of Ti–HAP biocomposites

Effect of HAP decomposition on the corrosion behavior of Ti–HAP biocomposites

Calcium Orthophosphate (CaPO4) Scaffolds for Bone Tissue Engineering Applications

Scratch and Abrasion Properties of Polyurethane-Based Micro- and Nano-Hybrid Obturation Materials

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