feldspar

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feldspar

[feld′spär]
Etymology: Ger, feld, field, spath, spar
a crystalline mineral of aluminum silicate with potassium, sodium, barium, and calcium. It melts over a range of 593.5° C to 1093° C (1100° F to 2000° F) and is an important component of dental porcelain.
References in periodicals archive ?
Fracture load of composite resin and feldspathic all-ceramic CAD/CAM crowns.
In southeastern Minnesota, the Van Oser Member is interfingered with the Waukon Member (also of the Jordan Formation) and is overlain by the Sunset Point Member of the Jordan (Ostrom, 1987) that is a fine-grained feldspathic and dolomitic shallow-marine deposit (Thomas, 1992) now referred to the Coon Valley Member of the overlying Oneota Dolomite (Clayton and Attig, 1990; Runkel, 1994).
Feldspathic ceramics, used as veneering porcelain in PFM restorations and lithium disilicate onlays are both glass-ceramic materi- als3 allowing etching process.
The two samples with more than 15% of matrix were classified as feldspathic wacke (FIGURE 6) whereas the other samples were classified as arenites (FIGURE 6a).
In their 2003 literature review, Blatz et al (2) reported that the high content of lithium disilicate crystalline phase may produce higher adhesion values than those of leucite or feldspathic ceramics, regardless of the surface treatment these materials are subjected to.
The predominant lithologies consist of mineralogically immature sandstones with heterogeneous granulation ranging from feldspathic sandstones to arkoses; these units range from thin layers to banks that are tens of meters thick (VIDAL-TORRADO; LEPSCH, 1999).
This rock unit is characterised by grey foliated Biotite acid/Biotite Hornblende quartz feldspathic gneiss of tonalitic to granodioritic composition [12];Mafic to ultramafic component which outcrops as discontinuous boudinaged lenses or concordant sheet of amplibolites with minor amount of biotite-rich ultramafite; and Felsic component, a varied group comprised of pegmatite, aplite quartz-oligoclase veins, fine-grained granite gneiss, and porphyritic granite.
Contributors who work in dentistry, preventive and restorative medicine, and prosthodontics around the world detail fluorescence, the platinum foil technique, adhesive resin cements for bonding, matching a zirconia crown and leucite-reinforced feldspathic veneer, zirconia abutments, the ultraconservative preparation and restoration of the anterior dentition, implant-supported prostheses, the internal live staining technique in anterior ceramic crown restorations, the use of experimental birefringence photography, the importance of gingival tissue in anterior esthetic rehabilitations, and other topics.
The hardness of feldspathic porcelain ranges from (460 to 591) [kg/[mm.
is priced Daily Post can get plus pounds 4 calling quoting His book is the first by any author on what he describes as the "forgotten ceramics concern" which, in its day, was not only responsible for developing a new ceramic body - a semitransparent stoneware properly termed feldspathic stoneware - but was also an important player in the Potteries ceramic industry.