نتایج جستجو برای: chalcogenide glass ceramic

تعداد نتایج: 95306  

2010
Christopher J. Rowlands Stephen R. Elliott

A method for creating planar As2S3 waveguides with a minimum of processing steps is proposed, and the resulting waveguides have been characterized. When the processing parameters are optimized, the losses are low enough for practical use. The authors demonstrate this by creating serpentine waveguides with multiple bends and lengths in excess of 23cm. Keywords-component; chalcogenide glass; opti...

Intensified environmental regulations have posed numerous challenges in the disposal of industrial wastes. The steel industry is one of the biggest production industries, with a considerable amount of daily wastes. Production of glass-ceramic from the steel industry waters is one of the proper solutions for this problem. In this study, the application utilization of different wastes (such as bl...

2015
Min-Kyung Ji Ji-Hee Park Sang-Won Park Kwi-Dug Yun Gye-Jeong Oh Hyun-Pil Lim

PURPOSE This study was to evaluate the marginal fit of two CAD-CAM anatomic contour zirconia crown systems compared to lithium disilicate glass-ceramic crowns. MATERIALS AND METHODS Shoulder and deep chamfer margin were formed on each acrylic resin tooth model of a maxillary first premolar. Two CAD-CAM systems (Prettau®Zirconia and ZENOSTAR®ZR translucent) and lithium disilicate glass ceramic...

In the present study, the oxyfluoride glasses of SiO2-Al2O3-CaF2 system containing different amounts of Y3+ ions were prepared through the convenient melting method. The crystallization temperatures and size of the CaF2 nanocrystals were obtained from DTA curves and XRD patterns, respectively. As a consequence, the optimum amount...

2015
Min Yan Chung-Kai Wei Yuh-Yih Lin Suh-Woan Hu Shinn-Jyh Ding

Biomechanics play a critical role in influencing the clinical applications of all-ceramic dental restorations. The restorative biomaterials have to demonstrate mechanical durability in the oral environment because they are always exposed to a variety of oral environments. This study was designed to evaluate the effect of soaking time, notch and saliva pH values on the impact energy of three com...

2017
Myung-Jin Lim Kwang-Won Lee

OBJECTIVES The purpose of this study was to evaluate the effect of adhesive luting on the fracture resistance of zirconia compared to that of a composite resin and a lithium disilicate glass ceramic. MATERIALS AND METHODS The specimens (dimension: 2 mm × 2 mm × 25 mm) of the composite resin, lithium disilicate glass ceramic, and yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) were p...

2015
Carline R. G. van den Breemer Marco M. M. Gresnigt Marco S. Cune

AIM The aim of this comprehensive review is to systematically organize the current knowledge regarding the cementation of glass-ceramic materials and restorations, with an additional focus on the benefits of Immediate Dentin Sealing (IDS). MATERIALS AND METHODS An extensive literature search concerning the cementation of single-unit glass-ceramic posterior restorations was conducted in the da...

2015
Desmond M. Chow Joël C. Tchahame Andrey Denisov Jean-Charles Beugnot Thibaut Sylvestre Lizhu Li Raja Ahmad Martin Rochette Kenny Hey Tow Marcelo A. Soto Luc Thévenaz

The distributed Brillouin gain profile of an ultrathin optical microwire made of chalcogenide-glass is characterized using a phase-modulated correlation-domain measurement technique. Method resolves variations of uniformity below 5% along a 13 cm-long microwire. OCIS codes: (290.5900) Scattering, stimulated Brillouin, (060.2270) Fiber characterization

EFTEKHARI-YEKTA B., , MARGHUSSIAN V.K., ,

The effect of precipitation of ?.qss. and gahnite phases during heat treatment of glass frits in the ZnO-Al2O3-SiO2 system on the mechanical property of resulting glass-ceramic specimens were investigated. It was shown that gahnite glass-ceramics had higher bend strength and toughness values than ?.qss. ones. The results are attributed to the higher modulus of elasticity as well as higher therm...

Journal: :journal of dentistry, tehran university of medical sciences 0
s. zarrati assistant professor, dental research center, tehran university of medical sciences, tehran, iran f. mahboub assistant professor, dental and periodontal research center, tabriz university of medical sciences,

objective: this experimental in vitro study compared marginal adaptation of indirect composite, glass-ceramic inlays and direct composite. materials and methods: seventy-five recently extracted human molars were randomly divided into three groups (n=25) and mesio-occluso-distal cavities with the same dimensions were prepared in the teeth. indirect composite and glass-ceramic inlays were fabrica...

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