نتایج جستجو برای: glass and ceramic consequently
تعداد نتایج: 16851172 فیلتر نتایج به سال:
Ceramics are a very popular material in dental implant technology due to their tribological properties, their biocompatibility and their esthetic appearance. However, their natural surface structure lacks the ability of proper osseointegration, which constitutes a crucial process for the stability and, thus, the functionality of a bone implant. We investigated the application of a glass solder ...
the aim of this study was to compare the shear bond strength (sbs) of resin modified glass ionomer (rmgi) and composite resin for bonding metal and ceramic brackets.eighty-eight human premolars extracted for orthodontic purposes were divided into 4 groups (n=22). in groups 1 and 2, 22 metal and ceramic brackets were bonded using composite resin (transbond xt), respectively. twenty-two metal and...
Low Temperature Co-fired Ceramic (LTCC) technology has attracted much attention for high frequency applications due to the advantages in preparing 3D circuits within a ceramic block that enables burying of passive elements; resistor, inductor and capacitor (Jantunen et al., 2003). This technology also offers another advantages such as low fabrication cost due to parallel process, utilizing high...
Ceramic and glass materials exhibit desirable properties for various applications. A glass-ceramic composite material could be utilized as an alternative to pure ceramic materials, with a reduced energy requirement processing recycling. In this work, customized photosensitive pastes containing zirconia particles were created processed by stereolithography. Complex 2- dimensional 3-dimensional H...
Miserite, as a type of calcium potasium silicate mineral, was characterized by J.D. Scott at 1975 in the form of a chain silicate structure according to Formula. The primary cell parameters and the positioning of all atoms in the cell were characterized by scott and he also denoted that in this structure, some impurities such as,,… were substituted by as solid solution. Beal were synthesized ...
شیشه سرامیک 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 سرامیکها (شیشه سرامیک های حساس به نور) از سایر گروها متمایز شوند قابلیت رسوب دهی فاز بلوری در مناطق مورد نظر و از پیش تعیین شده می با...
in this research the focus of the researcher is on the influence of american myths that have long been held and offered by the american culture and ideologies. sam shepard is conceived to be one of the greatest playwrights of the contemporary american theater. in his works he depicts broken characters who are struggling to keep up with the national expectations but are ceaselessly borne back to...
recent studies in scientific education as well as foreign and second language instruction suggest that thinking has rarely been an integral part of education and training in classroom. some scholars decried the lack of emphasis on thinking in the institutes and schools. they noted that memorization and drills were rewarded,while inquiry, reflection, and consideration of alternatives were frowne...
In this work, the use of foam-like glass-ceramic scaffolds as trabecular coatings on ceramic prosthetic devices to enhance implant osteointegration is proposed. The feasibility of this innovative device was explored in a simplified, flat geometry: glass-ceramic scaffolds, prepared by polymeric sponge replication and mimicking the trabecular architecture of cancellous bone, were joined to alumin...
Nanofibrous glass/ceramic rigid shapes with uncommon structures, consisting of electrospun vitreous silica nanofibers coated 5–30 nm thick Al2O3 or MgAl2O4 ceramic layers, were fabricated in this study. Ceramic nanolayers restricted the viscous flow and provided strong structural bonding during partial sintering at 1200 °C. The interface interactions between nanofiber core nanolayer defined res...
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