Results 191 to 200 of about 272,347 (235)

Lithium Disilicate Glass Ceramics

2011
In this chapter, the best way to crystallize and process lithium disilicate glass ceramics for dental applications is discussed. In addition, the best way to modify the chemical composition and optimize the microstructure to achieve lithium metasilicate or lithium disilicate is assessed.
Emad El-Meliegy, Richard van Noort
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Containerless processing of a lithium disilicate glass

Journal of Materials Science, 2007
Glasses of Li2O.2SiO2 (LS2), and LS2 doped with 0.001wt% platinum (LS2 + 0.001 wt% Pt) compositions were melted, cooled and reheated at controlled rates while levitated (containerless) inside an Electrostatic Levitator (ESL) furnace at the NASA Marshall Space Flight Center, Huntsville, AL. The experiments were conducted in vacuum (approximately 10(exp -
Ranasinghe, KS, Ray, CS, Day, DE, Rogers, JR, Hyers, RW, Rathz, T   +5 more
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The structure of metastable lithium disilicate, Li2Si2O5

Acta Crystallographica Section C Crystal Structure Communications, 1990
Cristallisation dans Pbcn avec a=5,683, b=4,784, c=14,648 A, z=4; affinement jusqu'a R=0,063. Cette structure, differente de celle du Li 2 Si 2 O 5 stable, est au contraire similaire a celle du Na 2 Si 2 O 5 -α. Elle consiste en feuillets infinis de silicate, composes de tetraedres de SiO 4 se partageant les sommets, les atomes de lithium etant ...
R. I. Smith, R. A. Howie, A. R. West, A. Aragón-Piña, M. E. Villafuerte-Castrejón   +4 more
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In vitro cytotoxic response to lithium disilicate dental ceramics

Dental Materials, 2008
The use of lithium disilicate dental ceramics is increasing in dentistry and previous reports have suggested that they may have greater biological risks than previously thought. We tested a hypothesis that composition and processing influence the biological properties of these ceramics.The cytotoxicity of two machined and three pressed lithium ...
Brackett, Martha Goël, Lockwood, Petra E., Messer, Regina L W., Lewis, Jill B., Bouillaguet, Serge, Wataha, John C.   +5 more
openaire   +3 more sources

Alteration of the intaglio surface of lithium disilicate glass-ceramic

The Journal of Prosthetic Dentistry, 2019
Clinical adjustment of a lithium disilicate glass-ceramic (LDGC) restoration may necessitate its return to the laboratory for additional firing. Evidence of how the intaglio surface should be re-etched after internal adjustment, or after refiring, is lacking.The purpose of this in vitro study was to investigate the effects of different sequences of ...
Catherine M. Gorman, Daithi de Faoite, David Flannery, Marta Ratajczak, Tomás Kelly, Kenneth T. Stanton   +5 more
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Morphogenesis in lithium disilicate glass

1993
This thesis was digitised by the British Library from microfilm. You can acquire a single copy of this thesis for research purposes by clicking on the padlock icon on the thesis file. Please be aware that the text in the supplied thesis pdf file may not be as clear as text in a thesis that was born digital or digitised directly from paper due to the ...
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Metastable phases in lithium disilicate glasses

Journal of Non-Crystalline Solids, 1997
Abstract This article deals with crystal nucleation in glass, with special emphasis on new findings about metastable phase formation in lithium disilicate glass (LS2) and its effects on crystallization of the stable LS2 crystal phase. The early crystallization stages of slightly sub-stoichiometric LS2 glasses were probed with SAXS and selected area ...
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Adherence of Streptococcus mutans on lithium disilicate porcelain specimens

The Journal of Prosthetic Dentistry, 2015
Streptococcus mutans can adhere at restored tooth margins to cause recurrent caries. Limited information about surface quality and bacterial adherence is available for lithium disilicate ceramic materials.The purpose of this in vitro study was to investigate how bacterial adherence is influenced by commercially available preparations of lithium ...
Diane T, Vo, Dwayne, Arola, Elaine, Romberg, Carl F, Driscoll, Mary Ann, Jabra-Rizk, Radi, Masri   +5 more
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An In Vitro Investigation Into the Wear Effects of Lithium Disilicate, Zirconia, and Zirconia Reinforced Lithium Disilicate Ceramic Materials on an Opposing Material

Journal of Esthetic and Restorative Dentistry
ABSTRACT Objective The aim of the present study was to evaluate the surface roughness and wear effect of three different ceramic materials. Materials and Methods Thirty ceramic discs (10/group ...
Majd Y. U'wais, Ahed Al‐Wahadni, Abedelmalek K. Tabnjh   +2 more
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WEAR OF LITHIUM DISILICATE OPPOSING ZIRCONIA, LITHIUM DISILICATE, AND PORCELAIN.

2023
Pranit Bora, Lawson, Nathaniel
openaire   +1 more source