Optimum particle size distribution for reduced sintering shrinkage of a dental porcelain

Rasmussen, Stephen T.; Ngaji-Okumu, Walter; Boenke, Kenneth M.; O’Brien, William J.

doi:10.1016/s0109-5641(97)80007-3

Cited by 30 publications

(24 citation statements)

References 11 publications

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“…However, the grain size above a critical value (<0.8 µm) is not able to retain the tetragonal structure at room temperature, leading to a decrease in the mechanical properties [19,20]. In other words, unrestrained shrinkage of ceramics may lead to marginal accuracy and decreased strength of ceramic restorations [21,22]. Moreover, the shrinkage characteristic in formation of necks between particles and its subsequent unification during the sintering process can be modeled dependent on variation in sintering temperature and time [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO₂ commercial ceramics

Mendes

Costa

Araújo

et al. 2017

Materials Science-Poland

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In this work, the effect of sintering parameters on electronic structure and physical properties of yttria-partially stabilized ZrO 2 (YPSZ) commercial ceramics has been studied using the central composite design (CCD) method. The CCD method allows using empirical modelling with better fitting, by considering the interaction between both factors. Different temperature ranges and sintering times for processing of YPSZ ceramics have been used in order to evaluate the grain growth, hardness and volumetric shrinkage by the CCD method. X-ray diffraction patterns and Rietveld refinement data indicate that non-sintered YPSZ ceramics exhibits two phases related to tetragonal and monoclinic structures, while the sintered YPSZ ceramics exhibits a single phase related to a tetragonal structure. Moreover, the monoclinic structure presents zirconium (Zr) atoms coordinated to seven oxygen (O) atoms, while in the tetragonal structure Zr atoms are coordinated to eight O atoms. Field emission scanning electron microscopy images were employed to monitor the sintering and growth process. In addition, the response surfaces obtained from calculations presented the effect of thermal and kinetic variables on the physical properties such as average grain size, volumetric shrinkage and hardness of YPSZ ceramics.

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Section: Introductionmentioning

confidence: 99%

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO₂ commercial ceramics

Mendes

Costa

Araújo

et al. 2017

Materials Science-Poland

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“…Sintering involves nonequilibrium dynamics 21,23,[25][26][27][28][29][30][31][32][33][34][35] of kinetic processes of transport of matter: atoms, ions or molecules, to be termed "atoms" for brevity. These processes include onsurface restructuring, and detachment/reattachment.…”

Section: Introductionmentioning

confidence: 99%

Nonequilibrium kinetic modeling of sintering of a layer of dispersed nanocrystals

2014

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We report a kinetic Monte Carlo modeling study of nanocrystal layer sintering. Features that are of interest for the dynamics of the layer as a whole, especially the morphology of the evolving structure, are considered. It is found that the kinetics of sintering is not entirely a local process, with the layer morphology affected by the kinetics in a larger than few-particle neighborhood. Consideration of a single layer of particles makes the numerics manageable and allows visualization of the results, as well as numerical simulations of several realizations for statistical averaging of properties of interest. We identify optimal regimes for sintering, considering several particle size distributions and temperature control protocols.

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“…[1] This is a result of the excellent aesthetic properties of these fillings, as well as health concerns regarding mercury release from amalgam fillings. [2] Therefore, the relation of filler properties to composite characteristics, such as radiopacity, [3] tensile strength, [4] hardness, [5] shrinkage, [6] wear, [2] and transparency [1] have been intensely studied in the last few years.…”

Section: Introductionmentioning

confidence: 99%

“…[1] When using smaller filler particles, the attainable filler content is lower than when using larger ones, and this increases the composite polymerization shrinkage. [6] The composite wear, however, is significantly lower for nanometer-than for micrometer-sized particles. [2] High initial transparency of the dental filler is desired as the opacity of the dental filling is adjusted to the patient's tooth color by opaque additives.…”

Section: Introductionmentioning

confidence: 99%

Transparent Nanocomposites of Radiopaque, Flame-Made Ta₂O₅/SiO₂Particles in an Acrylic Matrix

et al. 2005

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Mixed Ta2O5‐containing SiO2 particles, 6–14 nm in diameter, with closely controlled refractive index, transparency, and crystallinity are prepared via flame spray pyrolysis (FSP) at production rates of 6.7–100 g h–1. The effect of precursor solution composition on product filler (particle) size, crystallinity, Ta dispersity, and transparency is studied using nitrogen adsorption, X‐ray diffraction, optical microscopy, high‐resolution transmission electron microscopy (HRTEM), and diffuse‐reflectance infrared Fourier‐transform spectroscopy (DRIFTS). Emphasis is placed on the transparency of the composite that is made with Ta2O5/SiO2 filler and dimethylacrylate. Increasing Ta2O5 crystallinity and decreasing Ta dispersity on SiO2 decreases both filler and composite transparencies. Powders with identical specific surface area (SSA), refractive index (RI), and Ta2O5 content (24 wt.‐%) show a wide range of composite transparencies, 33–78 %, depending on filler crystallinity and Ta dispersity. Amorphous fillers with a high Ta dispersity and an RI matching that of the polymer matrix lead to the highest composite transparency, 86 %. The composite containing 16.5 wt.‐% filler that itself contains 35 wt.‐% Ta2O5 has the optimal radiopacity for dental fillings.

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Optimum particle size distribution for reduced sintering shrinkage of a dental porcelain

Cited by 30 publications

References 11 publications

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO₂ commercial ceramics

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO₂ commercial ceramics

Nonequilibrium kinetic modeling of sintering of a layer of dispersed nanocrystals

Transparent Nanocomposites of Radiopaque, Flame-Made Ta₂O₅/SiO₂Particles in an Acrylic Matrix

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Optimum particle size distribution for reduced sintering shrinkage of a dental porcelain

Cited by 30 publications

References 11 publications

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO2 commercial ceramics

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO2 commercial ceramics

Nonequilibrium kinetic modeling of sintering of a layer of dispersed nanocrystals

Transparent Nanocomposites of Radiopaque, Flame-Made Ta2O5/SiO2Particles in an Acrylic Matrix

Contact Info

Product

Resources

About

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO₂ commercial ceramics

Effect of sintering parameters using the central composite design method, electronic structure and physical properties of yttria-partially stabilized ZrO₂ commercial ceramics

Transparent Nanocomposites of Radiopaque, Flame-Made Ta₂O₅/SiO₂Particles in an Acrylic Matrix