Fracture strength of ceramic monolithic crown systems of different thickness

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Fracture strength of ceramic monolithic crown systems of different thickness

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Publication Article, peer reviewed scientific
Title Fracture strength of ceramic monolithic crown systems of different thickness
Author(s) Nordahl, Niklas ; von Steyern, Per Vult ; Larsson, Christel
Date 2015
English abstract
The objective of this study was to evaluate fracture strength of high-translucent (HTZ) and low-translucent (LTZ) zirconia and glass-ceramic (LDS) crowns. HTZ and LTZ crowns were made with thicknesses of; 0.3 mm, 0.5 mm, 0.7 mm, 1.0 mm, and 1.5 mm; and LDS crowns of 1.0 mm and 1.5 mm thicknesses. Each group consisted of 10 crowns. All crowns underwent artificial aging before loading until fracture. Mean fracture strengths varied from 450 N to 3,248 N in the LTZ group, 438 N to 3,487 N in the HTZ group, and 1,030 N to 1,431 N in the LDS group. The load at fracture of HTZ and LTZ crowns was equal. The load at fracture of yttria-stabilized tetragonal zirconia polycrystals crowns was significantly greater than LDS crowns (P = 0.000). Two types of fractures were recorded; complete and partial crack-like fracture. The crack type fracture occurred most frequently in all groups except in the thicker LTZ groups (1.0 mm and 1.5 mm). According to this study, there is no difference in strength between crowns made of high-translucent or low-translucent zirconia. At equal thickness, the strength of zirconia crowns was significantly greater than that of lithium-disilicate glass-ceramic.
DOI http://dx.doi.org/10.2334/josnusd.57.255 (link to publisher's fulltext)
Publisher Nihon University School of Dentistry
Host/Issue Journal of oral science;3
Volume 57
ISSN 1343-4934
Pages 255-261
Language eng (iso)
Subject(s) zirconia
lithium-disilicate
crowns
translucent
Y-TZP
Technology
Research Subject Categories::ODONTOLOGY
Handle http://hdl.handle.net/2043/20053 (link to this page)

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