نتایج جستجو برای: glass ceramic
تعداد نتایج: 93472 فیلتر نتایج به سال:
A YSiAlON glass has been studied by mechanical spectroscopy, through the glass transition. The a-relaxation peak observed in the YSiAlON glass can be interpreted well by a formalism of hierarchically correlated molecular mobility through the glass transition. In particular this formalism accounts for the observation of unusually high apparent activation energy. The viscoelastic properties of th...
Abstract Background and Aim: The opacity of dental ceramics has important role in final appearance of all ceramic restorations. opacity of super high translucent zirconia is not clearly determined.The aim of this study was evaluating the opacity of two super high translucent zirconia (zolid fx and DD cubeX2 ) and lithium disilicate reinforced glass ceramic(IPS e.max CAD LT). Materials and Metho...
BACKGROUND Natural products have numerous medicinal applications and play important roles in the biology of the organisms that accumulate them. Few methods are currently available for identifying proteins that bind to small molecules, therefore the discovery of cellular targets for natural products with pharmacological activity continues to pose a significant challenge in drug validation. Simil...
The joining of porous Si3N4 to dense Si3N4 ceramics has been successfully performed using mixed RE2O3 (RE = Y or Yb), Al2O3, SiO2, and α-Si3N4 powders. The results suggested that the α-Si3N4 powders partly transformed into β-SiAlON and partly dissolved into oxide glass to form oxynitride glass. Thus, composites of glass/β-SiAlON-ceramic formed in the seam of joints. Due to the capillary action ...
Introduction: The aim of the present study was to evaluate the effect of glass ceramic insert in the sandwich technique to reduce microleakage in class II composite resin restorations. Methods: Sixty sound human upper second premolars were selected and randomly divided into six groups (n=10). Class II boxonly cavities were prepared in distal aspects of each tooth with gingival margin located ap...
شیشه سرامیک های محصولاتی هستند که ابتدا به صورت قطعات شیشه ای شکل داده شده و سپس با عملیات حرارتی مناسب که معمولا در دو مرحله جوانه زنی و رشد انجام می شود به قطعاتی کم و بیش بلورین (معمولا بین 50 تا 100 درصد بلورین) تبدیل می شوند. عاملی که باعث شده است این گروه از شیشه سرامیک ها (شیشه سرامیک های حساس به نور) از سایر گروها متمایز شوند قابلیت رسوب دهی فاز بلوری در مناطق مورد نظر و از پیش تعیین شد...
The potential of the tailings from Morille scheelite-bearing calc-silicate deposit as a commercial raw material for inert glass–ceramic was determined. Nucleation and crystal growth temperatures glass were studied. maximum nucleation rate parent are 612 °C 660 is at 776 1047 °C. At nepheline, wollastonite akermanite formed. In glasses treated higher temperature nepheline becomes unstable wollas...
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