background: although studies have shown that porcelain veneers are very effi cient for treating discolored teeth, they did not address in particular the minimum thickness of a multilayer ips e.max press (ivoclarvivadent, schaan, liechtenstein) restoration required to mask discolored tooth. the aim of this study was to determine the minimum thickness of a multilayer porcelain restoration require...

statement of problem: the effect of porcelain surface on the antagonist acrylic teeth has not been widely studied. objectives: this study aimed to investigate the effect of polished porcelain, glazed porcelain, and natural teeth (as the control group) on the acrylic resin teeth. materials and methods: in this experimental-laboratory study, a total of 60 specimens of glazed and polished porcelai...

The aim of this study was to compare the effects of different porcelain polishing techniques on the color change and surface roughness of feldspathic porcelains and lithium disilicate glass-ceramic system. 80 porcelain specimens were divided into two subgroups, each subgroup was divided into 4 groups of 10 specimens. Surfaces were polished with different ceramic polishers. VITA Easyshade spectr...

statement of the problem: porcelain may fracture or chip if exposed to any traumas and can be repaired by using a resin composite. purpose: this study was aimed to evaluate the influences of er:yag laser on shear bond strength (sbs) of resin composite to feldspathic porcelain. materials and method: seventy-two porcelain blocks were divided into six groups (n=12): g1: no treatment (control group...

T o simulate the bluish-white fluorescence of natural teeth under ultraviolet light,‘-’ dental manufacturers use fluorophors of proprietary composition. Uranium oxides were often used in the past in combination with cerium to impart a realistic fluorescence to dental porcelain.* Uranium is no longer used as a result of increased awareness of possible radiation effects on oral tissues.‘.” Fluore...

Semiterrestrial and terrestrial crabs have evolved multiple strategies for aerial respiration. An uncommon strategy for aerial respiration is seen in porcelain crabs, genus Petrolisthes, where decalcified areas on the meral segments of the walking legs are used as respiratory structures. Here, the evolutionary history and adaptive significance of these structures in porcelain crabs is examined....

BACKGROUND Although studies have shown that porcelain veneers are very efficient for treating discolored teeth, they did not address in particular the minimum thickness of a multilayer IPS e.max Press (IvoclarVivadent, Schaan, Liechtenstein) restoration required to mask discolored tooth. The aim of this study was to determine the minimum thickness of a multilayer porcelain restoration required ...

The purpose of the present study was to evaluate the effect of cooling rates after firing procedures of veneering porcelain on shear bond strength between veneering porcelain and a zirconium dioxide (zirconia; ZrO₂) ceramic material. A total of 48 ZrO₂ disks were divided equally into three groups. Two veneering porcelains that are recommended for ZrO₂ material - Cerabien ZR (CZR), IPS e.max Cer...

porcelain seems to have much better special quality, abrasion wear resistance, corrosive resistance and so forth, which are considered the most important as dental restorative materials. But on the other side, porcelain materials have several defects at the same time, because they cannot be processed so easily as metallic or synthetic resin materials, and in addition, they have no elasticity in...

The literature related to stress distribution in porcelain-fused-to-gold restorations and the supporting structures has been reviewed by Craig, El-Ebrashi. and Peyton.1 They used two-dimensional composite photoelastic models to study the stress distribution in labial-lingual and mesial-distal sections of a central incisor that contained a porcelainfused-to-gold or a porcelain crown restoration....