Results 171 to 180 of about 611,594 (233)
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Evaluation of an experimental dental porcelain
Journal of the Mechanical Behavior of Biomedical Materials, 2010The aim of this study was to evaluate fracture toughness, hardness, ceramic/metal bond strength and microstructure of experimental dental porcelain and compare it with commercial type. Specimens of specific dimensions were prepared. Fracture toughness was assessed by a three-point bending test.
Ibrahim M, Hamouda +3 more
exaly +3 more sources
Metameric effect between dental porcelain and porcelain repairing resin composite
Dental Materials, 2007 Objectives. The objectives were to evaluate the metameric color and hue angle (degrees) changes between dental porcelain and porcelain repairing resin composites. Methods.
Sunghee Kim +2 more
exaly +2 more sources
Fluorescence of dental porcelain
The Journal of Prosthetic Dentistry, 1993This study of the fluorescence of natural enamel and of dental ceramics shows the fluorescence of ceramics not containing rare earths decreases when the color saturation increases; the fluorescence of samples of the same shade guide are not homogenous; some guides show a strong green fluorescence; and two shade guides of the same origin can present ...
G, Monsénégo +2 more
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Luminescence Spectra of Dental Porcelains
Journal of Dental Research, 1978The luminescence spectra were obtained for a series of porcelain teeth and powders currently used in this country. Comparison was made between the spectra of these materials and the spectra of plastic teeth and natural tooth structures. It was found that many of the porcelain teeth and powders have strikingly different luminescence characteristics than
W T, Wozniak, B K, Moore
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The endurance limit of dental porcelain*
Australian Dental Journal, 1974Abstract— Dental porcelain is subject to static fatigue and has an endurance limit to stress. There is great variation to subdestructive loading above that limit. Its reliability necessitates stress be kept below that limit but chemical treatment can raise the endurance limit.
D E, Southan, K D, Jorgensen
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Surface finishing of dental porcelain
The Journal of Prosthetic Dentistry, 1981Abstract A technique is presented to polish a porcelain surface whose natural glaze has been broken by grinding. The technique involves the use of a hard rubber wheel, fine wet pumice, and wet tin oxide. A comparison of the polished and naturally glazed porcelain surfaces of vacuum-fired porcelain appear similar both clinically and under an SEM.
W D, Sulik, E J, Plekavich
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Color mixing in dental porcelain
Dental Materials, 1993For esthetic reasons, pigments and opacifiers are added to porcelains used in restorative dentistry. The purpose of this study was to use Kubelka-Munk theory (Kubelka and Munk, 1931) to predict and analyse the colors of porcelains modified by the addition of two pigments and an opacifying agent. The base porcelain was composed of 88% potassium feldspar,
W T, Wozniak +5 more
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Visco-elastic deformation of dental porcelain and porcelain-metal compatibility
Dental Materials, 1991A computer simulation using a visco-elastic stress analysis was conducted to clarify the effect of the heating rate on deformation temperature of dental porcelain during firing. In this simulation, the following temperature-dependent factors were incorporated: elastic modulus, viscosity, and coefficient of thermal expansion.
K, Asaoka, J A, Tesk
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Wear of low-fusing dental porcelains
The Journal of Prosthetic Dentistry, 1999The resistance of wear of dental porcelains is of concern when selecting a material for metal-ceramic and all-ceramic restorations.An in vitro investigation was performed to rank a number of dental porcelains with respect to their wear-resistance properties. Material and methods.
P, Derand, P, Vereby
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Polishing of dental porcelain by polycrystalline diamond
Bio-Medical Materials and Engineering, 2010Polycrystalline diamond (PCD) exhibits excellent abrasive characteristics and is commonly used as loose grains for precision machining of hard ceramics and other materials that are difficult to grind and polish. In the present study, we investigated using bonded PCD for polishing dental porcelain, for which a lustrous surface is difficult to obtain by ...
Yoshiharu, Nakamura +3 more
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