NEW ANALYSIS OF THE EDGE CHIPPING RESISTANCE OF BRITTLE MATERIALS

The relationship between the force required to create an edge chip and the distance from the edge may be non-linear. A quadratic equation relating the indentation load and size, with separate terms for the fracture and deformation processes, is often used in indentation hardness studies. A similar r...

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Bibliographic Details
Published inCeramic Engineering and Science Proceedings pp. 209 - 224
Main Authors Quinn, G D, Quinn, J B
Format Journal Article
LanguageEnglish
Published 01.01.2015
Subjects
Aluminum oxide
Ceramics
Chipping
Dental materials
Glass ceramics
Hardness
Indentation
Mathematical analysis
Nonlinearity
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ISBN1119031184
9781119031185
ISSN0196-6219

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Summary:The relationship between the force required to create an edge chip and the distance from the edge may be non-linear. A quadratic equation relating the indentation load and size, with separate terms for the fracture and deformation processes, is often used in indentation hardness studies. A similar relationship is proposed for edge chipping. Force-edge distance relationships were determined for a variety of dental restorative materials using a sharp conical indentor with a tip angle of 120 degrees. These included feldspathic porcelain, leucite glass-ceramic, lithium disilicate glass-ceramic, filled resin composite, nanocomposite, TZP, alumina, and alumina/alumina-zirconia layered composite materials. The force-distant relationship varied from linear to non-linear, dependent upon the material hardness, fracture toughness and elastic modulus. The hard materials tended to exhibit linear chipping behaviour. An edge chipping equation is proposed.
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ISBN:1119031184
9781119031185
ISSN:0196-6219