Effect of processing variables on texture development in a mica-based glass-ceramic.

Effect of processing variables on texture development in a mica-based glass-ceramic. Research Abstract Details 

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Effect of processing variables on texture development in a mica-based glass-ceramic. Abstract Text:

I L Denry,G Baranta,J A Holloway,P K Gupta,I L Denry,G Baranta,J A Holloway,P K Gupta,

The purpose of this study was primarily to determine the feasibility of heat-pressing a mica-based glass-ceramic with the use of commercially available dental equipment, and secondly to evaluate the effect of various processing variables on the degree of crystal alignment in the pressed glass-ceramic. The hypotheses were that the mica-based glass-ceramic could be successfully heat-pressed and that some degree of crystal orientation would be obtained, depending on the processing variables. The glass composition was melted at 1400 degrees C for 2 h and cast into 12 x 60-mm rods. Ingots (10 x 12 mm) were cut from the glass rods, heat treated, and heat-pressed under various conditions. The microstructure of the pressed specimens was investigated by SEM and compared to that of heat-treated controls. The length of Vickers-induced cracks was measured on heat-pressed specimens and heat-treated controls. The results showed that mica-based glass-ceramics could be successfully pressed with the use of commercially available dental equipment. The resulting degree of crystal alignment (texture) along the direction of pressing varied between 35 +/- 6 and 79 +/- 6. There was a linear relationship between the degree of texture and the apparent aspect ratio of the mica platelets. A significant decrease in the length of the Vickers-induced cracks in the direction perpendicular to pressing was observed, associated with an increase in length in the direction of pressing.

Effect of processing variables on texture development in a mica-based glass-ceramic. Publishing Authors By Initials

IL Denry,G Baranta,JA Holloway,PK Gupta,IL Denry,G Baranta,JA Holloway,PK Gupta,

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Effect of processing variables on texture development in a mica-based glass-ceramic. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of biomedical materials research. Part B,

VOLUME: 64B

Page Numbers: 70-7

Journal Abbreviation: J. Biomed. Mater. Res. Part B

ISSN: 1552-4973

DAY: 15

MONTH: Feb

YEAR: 2003

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LANGUAGE: eng

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AFFILIATION: College of Dentistry, Section of Restorative Dentistry, Prosthodontics, and Endodontics, The Ohio State University, 305 West 12th Avenue, Box 191, P.O. Box 182357, Columbus, Ohio 43218.

Country: United States

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MEDLINETA: J Biomed Mater Res B Appl Biom

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