Publication: Interfacial toughness of bilayer dental ceramics based on a short-bar, chevron-notch test.
Issued Date
2010-02
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Language
eng
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Mahidol University
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Academy of Dental Materials
Mahidol University
Mahidol University
Bibliographic Citation
Anunmana C, Anusavice KJ, Mecholsky JJ Jr. Interfacial toughness of bilayer dental ceramics based on a short-bar, chevron-notch test. Dent Mater. 2010 Feb;26(2):111-7.
Suggested Citation
Chuchai Anunmana, ชูชัย อนันต์มานะ, Anusavice, Kenneth J., Mecholsky, Jr., John J. Interfacial toughness of bilayer dental ceramics based on a short-bar, chevron-notch test.. Anunmana C, Anusavice KJ, Mecholsky JJ Jr. Interfacial toughness of bilayer dental ceramics based on a short-bar, chevron-notch test. Dent Mater. 2010 Feb;26(2):111-7.. doi:10.1016/j.dental.2009.09.003 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/1011
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Title
Interfacial toughness of bilayer dental ceramics based on a short-bar, chevron-notch test.
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Abstract
Objective—The objective of this study was to test the null hypothesis that the interfacial toughness
of each of two types of bonded core-veneer bilayer ceramics is not significantly different from the
apparent fracture toughness of the control monolithic glass veneer.
Methods—T-shaped short bars of a lithia-disilicate glass-ceramic core (LC) and yttria-stabilized
polycrystalline zirconia core ceramic (ZC) were prepared according to the manufacturer's
recommendations. V-shaped notches were prepared by using 25-μm-thick palladium foil, leaving
the chevron notch area exposed, and the bars were veneered with a thermally compatible glass veneer
(LC/GV and ZC/GV). Additionally, we also bonded the glass veneer to itself as a control group (GV/
GV). Specimens were kept in distilled water for 30 days before testing in tension. Eight glass veneer
bars were prepared for the analysis of fracture toughness test using the indentation-strength technique.
Results—The mean interfacial toughness of the LC/GV group was 0.69 [0.11] MPa·m1/2, and did
not significantly differ from that of the GV/GV control group, 0.74 (0.17) MPa·m1/2 (p > 0.05).
However, the difference between the mean interfacial toughness of the ZC/GV group, 0.13 (0.07)
MPa·m1/2, and the LC/GV and the GV/GV groups was statistically significant (p<0.05).
Significance—For bilayer all-ceramic restorations with high-strength core materials, the veneering
ceramics are the weakest link in the design of the structure. Since all-ceramic restorations often fail
from chipping of veneer layers or crack initiation at the interface, the protective effects of thermal
mismatch stresses oral prosthesis design should be investigated.