نتایج جستجو برای: hard porcelain
تعداد نتایج: 149771 فیلتر نتایج به سال:
Statement of Problem: In order to eliminate the esthetic problem of metal collar in porcelain fused to metal crowns various techniques, such as shoulder porcelain, have been suggested. Purpose: The aim of this study was to investigate the effects of repeated porcelain firing cycles on the marginal integrity of shoulder in porcelain fused to metal crowns, made of two kinds of alloys: noble and b...
statement of problem: recent clinical results for zirconia all-ceramic restorations have revealed that the fracture rate 6-15% of the zirconia framework is so low and the core of zirconia has high stability. however, chipping-off fractures of porcelain are the most common reason for failures of zirconia in the fixed partial dentures. objectives: the purpose of this study was to compare the shea...
statement of the problem: increasing the thickness of the veneering porcelain may affect the polymerization of resin cements. incomplete polymerization of resin cements can lead to compromised quality of restoration and decrease the longevity of indirect restorations. purpose: this study sought to assess the effect of ips empress porcelain thickness on the degree of conversion of light-cure and...
The viability of rare earth ions as fluorescent coloring additives for dental porcelain was investigated. The data presented allow the formulation of porcelain with specific color properties under illumination by ultraviolet light. Attention is drawn to the possibility of energy transfer occurring with the result that prediction of color may not be done by application of the additive color-mixi...
PURPOSE This study evaluated the color stability of four stains of a light-cured porcelain stain system between the light-cured and fired stages. MATERIALS AND METHODS Thirty-six ceramometal discs 20 mm in diameter and 2 mm in thickness were cast to provide the substrate on which Ceramco II porcelain was applied. The porcelain was polished to a uniform thickness of 2 mm, and the samples were ...
To evaluate the bonding reliability of a universal adhesive compared to commercial ceramic repair system for metal-ceramic cracks. In vitro part: sixty specimens with porcelain, metal and porcelain-metal substrate were fabricated. Half bonded by Singlebond Universal Filtek Z350 resin composite. The other processed Ceramic Repair N. Shear bond strength was tested. vivo forty patients fractured p...
This article presents a technique for the fabrication of provisional veneers when a single full-coverage anterior restoration is involved. A case that includes seven porcelain veneers and one all-ceramic crown is discussed.
OBJECTIVES This study sought to assess the effect of bracket base design on the shear bond strength (SBS) of the bracket to feldspathic porcelain. MATERIALS AND METHODS This in vitro, experimental study was conducted on 40 porcelain-fused-to-metal restorations and four different bracket base designs were bonded to these specimens. The porcelain surfaces were etched, silanized, and bonded to b...
Objectives Due to the increasing price of gold CAD/CAM titanium-ceramic restorations were developed to give alternative to the established metal-ceramic restorations with a high gold content. Despite the advantages of excellent biocompatibility, high corrosion resistance and appropriate strength titanium has made the casting process difficult caused by the high affinity of molten titanium to in...
Received Jul 10, 2017 Revised Oct 14, 2017 Accepted Oct 26, 2017 Overhead line insulators can be damaged for various reasons during their service life. Porcelain or glass insulators once damaged can affect the reliability of power system networks. This paper presents the study of voltage and electric characteristics along the surface of a broken porcelain insulator located in a string of 10 uni...
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