A numerical simulation model, which was based on the setting and heating reactions of the binder ... more A numerical simulation model, which was based on the setting and heating reactions of the binder phase of phosphate-bonded investment compacts, was developed to compute the porosities of set and burnout compacts. Densities and concentrations of microsilica particles in dilute suspension were measured and input into the simulation model. Validity of the model was confirmed by experimental results, that is, colloidal silica suspensions were prepared using different silica concentrations and mixed with investment powders. Porosities of these set and burnout compacts were experimentally measured. Effects of these factors on the porosity of compacts were examined using the developed simulation model: liquid/powder (L/P) ratio, concentration of microsilica particles in colloidal silica suspension, and ratio of binder component (NH4H2PO4) in investment powder. It was concluded that numerical simulation is a viable tool for dental materials research
The mechanical properties, color and transparency of glass-ceramics are highly dependent on the c... more The mechanical properties, color and transparency of glass-ceramics are highly dependent on the ceramming temperature and/or amount of the crystal phase in the glass matrix. In this study, the influence of crystallization on the strength and color, translucency of castable ceramics containing crystalline apatite and magnesium titanate were measured. It was concluded that magnesium titanate precipitated during ceramming, appeared to be an important factor in decreasing total transmittance and in determination of the color of glass-ceramics.
The mechanical properties, color and transparency of glass-ceramics are highly dependent on the c... more The mechanical properties, color and transparency of glass-ceramics are highly dependent on the ceramming temperature and/or amount of the crystal phase in the glass matrix. In this study, the influence of crystallization on the strength and color, translucency of castable ceramics containing crystalline apatite and magnesium titanate were measured. It was concluded that magnesium titanate precipitated during ceramming, appeared to be an important factor in decreasing total transmittance and in determination of the color of glass-ceramics.
... gen, which were obtained from reported data for titanium between the samples charged with 1 a... more ... gen, which were obtained from reported data for titanium between the samples charged with 1 and 10 A/m2 for 120 ... Fig. 11Amount of hydrogen absorbed based on the result computed from currents, fretting corrosion, and the uptake of hydrogen by ...
ABSTRACT Although autografts are considered to be the current gold standard, there is still clini... more ABSTRACT Although autografts are considered to be the current gold standard, there is still clinical demand for synthetic bone graft substitutes. Calcium phosphate cements (CPCs) have many favourable properties that support their clinical use in the repair of bone defects. Although the translation of CPCs from the bench to the bedside has been quite successful, some issues remain. This review article provides an overview of the recent progress in the development of CPC-based materials and also emphasises the challenges facing clinical applications. The next generation of CPCs with unique properties is emerging for specific clinical applications.
Materials Science Engineering a Structural Materials Properties Microstructure and Processing, Mar 1, 2008
ABSTRACT The hydrogen thermal desorption behavior of Ni–Ti superelastic alloy subjected to tensil... more ABSTRACT The hydrogen thermal desorption behavior of Ni–Ti superelastic alloy subjected to tensile deformation after hydrogen charging has been investigated. Cathodic hydrogen charging is performed with a current density of 10 A/m2 in a 0.9% NaCl aqueous solution for 2 h at room temperature (25 °C). In this case, hydrogen desorption is observed from room temperature to 400 °C. For the specimen immediately after hydrogen charging, upon tensile loading covering the stress plateau region caused by stress-induced martensite transformation followed by unloading, hydrogen that desorbs at low temperatures (approximately 150 °C) is observed markedly. In contrast, for the specimen aged for 240 h at room temperature in air after hydrogen charging, most hydrogen that desorbs at low temperatures shifts to a higher-temperature region and diffuses toward the center of the specimen, although the charged hydrogen does not diffuse out. Variation in hydrogen desorption behavior is rarely observed, even upon tensile loading in the plastic deformation region of the martensite phase followed by unloading. The present results suggest that dynamic processes such as stress-induced martensite and reverse transformations affect hydrogen desorption behavior at low temperatures of hydrogen-charged Ni–Ti superelastic alloy.
A numerical simulation model, which was based on the setting and heating reactions of the binder ... more A numerical simulation model, which was based on the setting and heating reactions of the binder phase of phosphate-bonded investment compacts, was developed to compute the porosities of set and burnout compacts. Densities and concentrations of microsilica particles in dilute suspension were measured and input into the simulation model. Validity of the model was confirmed by experimental results, that is, colloidal silica suspensions were prepared using different silica concentrations and mixed with investment powders. Porosities of these set and burnout compacts were experimentally measured. Effects of these factors on the porosity of compacts were examined using the developed simulation model: liquid/powder (L/P) ratio, concentration of microsilica particles in colloidal silica suspension, and ratio of binder component (NH4H2PO4) in investment powder. It was concluded that numerical simulation is a viable tool for dental materials research
The mechanical properties, color and transparency of glass-ceramics are highly dependent on the c... more The mechanical properties, color and transparency of glass-ceramics are highly dependent on the ceramming temperature and/or amount of the crystal phase in the glass matrix. In this study, the influence of crystallization on the strength and color, translucency of castable ceramics containing crystalline apatite and magnesium titanate were measured. It was concluded that magnesium titanate precipitated during ceramming, appeared to be an important factor in decreasing total transmittance and in determination of the color of glass-ceramics.
The mechanical properties, color and transparency of glass-ceramics are highly dependent on the c... more The mechanical properties, color and transparency of glass-ceramics are highly dependent on the ceramming temperature and/or amount of the crystal phase in the glass matrix. In this study, the influence of crystallization on the strength and color, translucency of castable ceramics containing crystalline apatite and magnesium titanate were measured. It was concluded that magnesium titanate precipitated during ceramming, appeared to be an important factor in decreasing total transmittance and in determination of the color of glass-ceramics.
... gen, which were obtained from reported data for titanium between the samples charged with 1 a... more ... gen, which were obtained from reported data for titanium between the samples charged with 1 and 10 A/m2 for 120 ... Fig. 11Amount of hydrogen absorbed based on the result computed from currents, fretting corrosion, and the uptake of hydrogen by ...
ABSTRACT Although autografts are considered to be the current gold standard, there is still clini... more ABSTRACT Although autografts are considered to be the current gold standard, there is still clinical demand for synthetic bone graft substitutes. Calcium phosphate cements (CPCs) have many favourable properties that support their clinical use in the repair of bone defects. Although the translation of CPCs from the bench to the bedside has been quite successful, some issues remain. This review article provides an overview of the recent progress in the development of CPC-based materials and also emphasises the challenges facing clinical applications. The next generation of CPCs with unique properties is emerging for specific clinical applications.
Materials Science Engineering a Structural Materials Properties Microstructure and Processing, Mar 1, 2008
ABSTRACT The hydrogen thermal desorption behavior of Ni–Ti superelastic alloy subjected to tensil... more ABSTRACT The hydrogen thermal desorption behavior of Ni–Ti superelastic alloy subjected to tensile deformation after hydrogen charging has been investigated. Cathodic hydrogen charging is performed with a current density of 10 A/m2 in a 0.9% NaCl aqueous solution for 2 h at room temperature (25 °C). In this case, hydrogen desorption is observed from room temperature to 400 °C. For the specimen immediately after hydrogen charging, upon tensile loading covering the stress plateau region caused by stress-induced martensite transformation followed by unloading, hydrogen that desorbs at low temperatures (approximately 150 °C) is observed markedly. In contrast, for the specimen aged for 240 h at room temperature in air after hydrogen charging, most hydrogen that desorbs at low temperatures shifts to a higher-temperature region and diffuses toward the center of the specimen, although the charged hydrogen does not diffuse out. Variation in hydrogen desorption behavior is rarely observed, even upon tensile loading in the plastic deformation region of the martensite phase followed by unloading. The present results suggest that dynamic processes such as stress-induced martensite and reverse transformations affect hydrogen desorption behavior at low temperatures of hydrogen-charged Ni–Ti superelastic alloy.
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