BACKGROUND Post-retained crowns are indicated for endodontically treated teeth (ETT) with severely damaged coronal tissue. Metallic custom and prefabricated posts have been used over the years, however, due to unacceptable color, extreme rigidity and corrosion, fiber posts, which are flexible, aesthetically pleasing and have modulus of elasticity comparable with dentin were introduced. AIM To...

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....

A woman (38 years) with tetracycline-stained maxillary anterior teeth came to dental office to improve her appearance. The porcelain veneers and zircon-porcelain crowns were selected as the best treatment option to mask the stained teeth. Medial line, occlusal line, level of gingival margin and frontal plane alignment of maxillary anterior teeth was analysed. Direct composite laminates were pla...

OBJECTIVE This study evaluated the influence of low concentration acid treatment on the shear bond strength between lithium disilicate (LD) infrastructure and veneering porcelain. The surface morphology characteristic after this acid treatment was also examined. STUDY DESIGN LD reinforced ceramic cylinders (n=10) (IPS e.max Press, Ivoclar-Vivadent, Schaan, Liechtenstein) were treated (LD-trea...

PURPOSE To systematically evaluate the survival and success of screw- versus cement-retained implant crowns. MATERIALS AND METHODS The authors performed an electronic search of nine databases using identical MeSH phrases. Systematic evaluation and data extraction of the articles from 1966 through 2007 were completed by three reviewers and two clinical academicians. The major outcome variable ...

STATEMENT OF PROBLEM The bond strength of dental porcelain to titanium is inadequate as a clinical alternative to conventional alloys for metal ceramic restorations. PURPOSE The purpose of this in vitro study was to evaluate the effects of coating titanium surface with a micro-arc oxidation (MAO) technique and hydroxyapatite (HA) on the bond strength of porcelain to titanium surfaces. MATER...

The metals for porcelain fusing used in this study were gold alloys and nickel-chromium alloys. Chromatic characteristics were compared between samples of 0.1, 0.2 and 0.3 mm thickness. The dentin porcelain was fused on the opaque surface. Chromatic analyses were then carried out at each stage of 0.1 mm-incremental reductions of the dentin thickness starting from 0.5 mm. In conclusion, the meta...

In power transmission lines, it is necessary to isolate the inherent voltage parts from each other and zero potential. An insulator defined as having a high degree of electrical insulation between conductors brackets. Insulators also allow for mechanical conductivity conductor ground. The presence broken can alter stress distribution. this paper, effect cracking (chattering) on electric field i...