Shape-memory NiTi foams produced by solid-state replication with NaF

Bansiddhi, Ampika; Dunand, David C.

doi:10.1016/j.intermet.2007.06.013

Cited by 121 publications

(82 citation statements)

References 40 publications

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“…The range of materials used as a space holder include saccharose crystals [63], NaF [64], NaCl [65,66] and polymer granules [67]. Magnesium has also been used as a space holder to produce porous dental and orthopedic implants [68].…”

Section: Fabrication Methods and Mechanical Evaluation Of Porous Titamentioning

confidence: 99%

“…The concept of creation of functionally graded structures in porous materials by changing the structure of the lattice has also been investigated [80]. [19,62] -sintering hollow spheres -thermal decomposition -sintering of powders, compressing and sintering of titanium beads or fibers Removable space holder and titanium metal powder particles: [63][64][65][66][67][68][69] -saccharose crystals -NaF -NaCl -polymer granules -Magnesium -ammonium hydrogen carbonate Additive manufacturing technology: [60,66,74] -selective laser sintering -selective laser melting -electron beam melting Bandyopadhyay and colleagues suggested laser engineered net shaping (LENS™) to construct porous structures from Ti-6Al-4V alloy across the range 23%-32% porosity with low modulus (7-60 GPa) which can be tailored to match human cortical bone [81]. Nomura et al in 2010 recommended the infiltration technique in a vacuum with sintering to create porous titanium/hydroxyapatite composites.…”

Section: Fabrication Methods and Mechanical Evaluation Of Porous Titamentioning

confidence: 99%

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Porous Titanium for Dental Implant Applications

Wally

Grunsven

Claeyssens

et al. 2015

Metals

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Abstract:Recently, an increasing amount of research has focused on the biological and mechanical behavior of highly porous structures of metallic biomaterials, as implant materials for dental implants. Particularly, pure titanium and its alloys are typically used due to their outstanding mechanical and biological properties. However, these materials have high stiffness (Young's modulus) in comparison to that of the host bone, which necessitates careful implant design to ensure appropriate distribution of stresses to the adjoining bone, to avoid stress-shielding or overloading, both of which lead to bone resorption. Additionally, many coating and roughening techniques are used to improve cell and bone-bonding to the implant surface. To date, several studies have revealed that porous geometry may be a promising alternative to bulk structures for dental implant applications. This review aims to summarize the evidence in the literature for the importance of porosity in the integration of dental implants with bone tissue and the different fabrication methods currently being investigated. In particular, additive manufacturing shows promise as a technique to control pore size and shape for optimum biological properties. OPEN ACCESSMetals 2015, 5 1903

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Section: Fabrication Methods and Mechanical Evaluation Of Porous Titamentioning

confidence: 99%

Section: Fabrication Methods and Mechanical Evaluation Of Porous Titamentioning

confidence: 99%

Porous Titanium for Dental Implant Applications

Wally

Grunsven

Claeyssens

et al. 2015

Metals

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show abstract

“…These are easiness in handling Ti raw material, which is highly oxygen-reactive, lower-than-melting temperatures employed in its processing and a fine control on volumetric porosity that resembles that of natural structures such as bone, preferred in bioengineering substrates and without straight edges [21]. Shape holder materials such as ammonium hydrogen carbonate, urea, sodium fluoride and chloride, saccharose and PMMA have been used in the manufacture of porous materials to control porosity and pore size [20,[22][23][24]. Therefore the strength-to-weight ratio can be optimised to match the mechanical properties of bone and these cavities engineered to promote cell proliferation, which results in anchoring of the bone graft in place to minimise loosening in the mid-and long-term.…”

Section: Introductionmentioning

confidence: 99%

The effect of pore size and porosity on mechanical properties and biological response of porous titanium scaffolds

Torres-Sánchez

Mushref

Norrito

et al. 2017

Materials Science and Engineering: C

158

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The effect of pore size and porosity on elastic modulus, strength, cell attachment and cell proliferation was studied for Ti porous scaffolds manufactured via powder metallurgy and sintering. Porous scaffolds were prepared in two ranges of porosities so that their mechanical properties could mimic those of cortical and trabecular bone respectively.Space-holder engineered pore size distributions were carefully determined to study the impact that small changes in pore size may have on mechanical and biological behaviour. The Young's moduli and compressive strengths were correlated with the relative porosity.Linear, power and exponential regressions were studied to confirm the predictability in the characterisation of the manufactured scaffolds and therefore establish them as a design tool for customisation of devices to suit patients' needs. The correlations were stronger for the linear and the power law regressions and poor for the exponential regressions. The optimal pore microarchitecture (i.e. pore size and porosity) for scaffolds to be used in bone grafting for cortical bone was set to <212m with volumetric porosity values of 27-37%, and for trabecular tissues to 300-500m with volumetric porosity values of 54-58%. The pore size range 212-300m with volumetric porosity values of 38-56% was reported as the least favourable to cell proliferation in the longitudinal study of 12 days of incubation.

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“…The space holder particles are mixed with metallic powder, then compacted and finally removed during or before sintering. A different space holder materials can be used, for example: sodium chloride, sodium fluoride, carbamide, ammonium hydrogen carbonate, titanium dihydride, magnesium and even tapioca [3][4][5][6][7][8][9]. All above mentioned space holder materials are useful in Ti or Ti-alloy foams preparation.…”

Section: Introductionmentioning

confidence: 99%

“…The space holders can be removed by temperature (evaporation) or by the solvent (dissolution). In many cases the process of dissolution is time consuming [6] and ineffective.…”

Section: Introductionmentioning

confidence: 99%

Titanium foam made with saccharose as a space holder

2013

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In this work we show a very promising method of titanium foam preparation with saccharose crystals (table sugar) as a space holder particles. The mixture of Ti and sugar particles was compacted to form a green compacts. In the next step the saccharose crystals were dissolved in the water, leaving open spaces surrounded by metallic scaffold. The sintering of the scaffold leads to foam with typical morphology and porosity. We found that 1:1 Ti/sugar ratio leads to porosities of about 72 % with pore diameter of about 0.8-1.0 mm, when we used 0.8-1.0 mm diameter sugar crystals. The foams morphology was investigated by SEM, porosity and internal structure was investigated using computed tomography and the structure was shown using XRD. The foam morphology pointed theirs potential applications in medical as well as catalyst devices.

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Shape-memory NiTi foams produced by solid-state replication with NaF

Cited by 121 publications

References 40 publications

Porous Titanium for Dental Implant Applications

Porous Titanium for Dental Implant Applications

The effect of pore size and porosity on mechanical properties and biological response of porous titanium scaffolds

Titanium foam made with saccharose as a space holder

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