A valuable characteristic of the "IPS Empress" used for producing all ceramic dental restorations is that it is a prefired ceramic ingot. The ingot is heated, softened and press-injected into the cavity, and ceramic restorations are fabricated by the lost wax casting method. The leucite crystal present in the ingot are scattered and distributed into the glassy phase in a more homogeneous manner...

The clinical goal when using ceramic biomaterials, as is the case with any biomaterial, is to replace lost tissue or organ structure and/or function. The rationale for using ceramics in medicine and dentistry was initially based on the relative biological inertness of ceramic materials compared with metals. However, in the past two decades, this emphasis has shifted more toward the use of bioac...

BaO -SiO2-Al2O3 glass ceramics containing K2O and B2O3 were prepared using conventional melting of powered batches, quenching in water and crystallization of sintered glass. XRD patterns introducehexacelsian and celsian as two major crystallized phases in sintered glass-ceramics. Presence of K2O enhances crystallization of hexacelsianin comparison withB2O3.Observations showed sintering temperat...

Europium doped transparent lead fluorophosphate glass ceramics successfully were prepared with heat treatment of precourse glasses at temperature above glass transition (Tg). X-ray diffraction (XRD) experiment evidenced the formation of PbF2 nanocrystals in glassy matrix. The emission spectra investigation indicate that considerable amount of Eu3+ ions were trapped in crystalline phase, and the...

Position Name Term Email Phone Number President Dalma Novak 2014-2015 [email protected] [1] (410) 590-3333 Past President Hideo Kuwahara 2014-2015 [email protected] [2] 81 44 754 2068 President Elect Kent Choquette N/A [email protected] [3] (217) 265-0563 Secretary Treasurer Peter Smowton 2nd year [email protected] [4] 44 2920 875997 VP Membership Paul Juodawlkis 2nd year j...

background: an increase in surface roughness of ceramics may decrease strength and affect the clinical success of ceramic restorations. however, little is known about the effect of acidic agents on ceramic restorations. the aim of this study was to evaluate the surface roughness of dental ceramics after being immersed in acidic agents.     methods: eighty-three ceramic disk specimens (12.0 mm i...

INTRODUCTION Alumina ceramics have long been of technological importance. However, their brittleness limits their potential for use in structural applications. Traditional approaches proposed to improve the strength and reliability of ceramics include: decrease flaw size, improve fracture toughness and flaw insensitivity, and decrease applied stresses. Polymers on the other hand, although weak,...

In the context of the modern world, the term ceramics suggests a very versatile group of materials capable of being designed to have particular physical and chemical properties and to fulfil a wide range of functions, functions that traditionally have often been fulfilled by other types of material.1 While suitably designed ceramics may hold the key to overcoming many of humankind’s future tech...

Calcium phosphate based glasses with different concentrations of TiO2 (0 to 2.5 mol%) were prepared and their corresponding glass-ceramics were obtained by controlled heat treatments. The amorphous nature of glasses and the presence of crystalline phases in glass-ceramics were studied through XRD studies. Density, molar volume, ultrasonic velocities, attenuation, elastic constants and microhard...

Of the principal classes of engineering materials, ceramics are in many ways the most interesting and challenging. Many properties, or combination, of properties, not achievable with other classes of materials give ceramics enormous technical potential. The main obstacles that prevent the wider use of ceramics include insufficient reliability, reproducibility, and high cost. The physical basis ...