Results 181 to 190 of about 8,010 (232)
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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 ...
Masaki Ohtsuka +3 more
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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.
Per Derand, Peter Vereby
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Isothermal phase transformations of a dental porcelain
Dental Materials, 2005The purpose of this investigation was to determine if the change in the leucite weight fraction during an isothermal heat treatment could be estimated by observing the deformation of PFM strips in a high-heating-rate, computer-controlled bending beam viscometer (BBV).Specimens of a commercial body porcelain were fired according to the manufacturer's ...
S. Warren Twiggs +4 more
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Fracture toughness of commercial dental porcelains
Dental Materials, 1986Abstract Ceramic materials suffer from a number of limitations which restrict their use in dental restorations. Chief among these shortcomings is their extreme brittleness which is manifested as a low ability to absorb elastic strain energy during structural failure.
R. Morena +2 more
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Thermal expansion of dental alloys and porcelains
Journal of Biomedical Materials Research, 1980AbstractThe effect of thermal coefficient of expansion (α) mismatch on porcelain‐metal bonding is frequently referred to in the dental literature. Thermally induced stresses may develop at metal‐porcelain system interfaces due to differences in the coefficients of thermal expansion of the porcelains, metals, and metal oxides.
D.T. Hashinger +4 more
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Polished versus autoglazed dental porcelain
The Journal of Prosthetic Dentistry, 1990This study compared the finishes on dental porcelain polished with four different polishing paste systems with oven reglazing and with a porcelain adjustment kit without a polishing paste. The polished/reglazed samples were rated according to quality of finish by independent observers and by scanning electron microscopy.
Joseph T. Richardson +2 more
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Viscosity of Dental Porcelain as a Function of Temperature
Journal of Dental Research, 1979A method for viscosity measurement is described and representative data are given for opaque, gingival, and incisal porcelains. The significance of viscosity in annealing and in stress development due to thermal expansion mismatch is discussed. Thermal history of the porcelain is shown to be important only over a relatively small temperature interval ...
R.L. Bertolotti, J.E. Shelby
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Masking Power of Dental Opaque Porcelains
Journal of Dental Research, 1984A technique was developed to qualify the masking power of undiluted opaque dental porcelain by dilution of opaque powder with a clear glaze powder and by extrapolation of quantitative data gathered by reflectance spectrophotometry. Quantification of reflectance data was made on dilute opaque porcelains using the scattering and absorption coefficients ...
Woolsey, G. D. +2 more
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The wear of dental porcelain in an artificial mouth
Dental Materials, 1986Abstract Simulated occlusal wear studies in an artificial mouth involving enamel occluding on porcelain demonstrated a high coefficient of wear for dental porcelain; in agreement with other workers, an abrasive wear process is postulated. Volume loss due to wear showed good linearity as a function of the number of masticatory cycles with slight ...
Maria R. Pintado +3 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.
John A. Tesk, Kenzo Asaoka
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