Results 171 to 180 of about 27,951 (232)
Some of the next articles are maybe not open access.
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
openaire +2 more sources
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 ...
W T, Wozniak, B K, Moore
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
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.
R L, Raimondo +2 more
openaire +2 more sources
British Ceramic Transactions, 2001
AbstractThree formulations of fluorophlogopite and orthoclase (4 : 1, 1 : 1, and 1 : 4 molar mixes, based on the stoichiometric composition) were prepared utilising local potash feldspar, as the main constituent for dental porcelain containing leucite and fluorophlogopite. Powders of the fritted batches were heat treated for 2 h at between 950 and 1050°
D.M. Ibrahim, E.A. El-Meliegy
openaire +1 more source
AbstractThree formulations of fluorophlogopite and orthoclase (4 : 1, 1 : 1, and 1 : 4 molar mixes, based on the stoichiometric composition) were prepared utilising local potash feldspar, as the main constituent for dental porcelain containing leucite and fluorophlogopite. Powders of the fritted batches were heat treated for 2 h at between 950 and 1050°
D.M. Ibrahim, E.A. El-Meliegy
openaire +1 more source
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
openaire +2 more sources
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, P E, Lockwood, C W, Fairhurst
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources