Abstract
Statement of problem
Materials used for dental restorations should cause wear similar to that of natural
teeth. Studies on the wear of dental alloys against monolithic zirconia are lacking.
Purpose
The purpose of this in vitro study was to compare the wear of Co-Cr, gold, and Ni-Cr
alloys against monolithic zirconia of different surface roughness.
Material and methods
Cylindrical monolithic zirconia specimens were prepared by a sintering process. Sintered
zirconia was then polished to prepare 30 zirconia substrate specimens with a smooth
surface (Ra<0.1 μm) and 30 with a rough surface (3.5 μm<Ra<4.5 μm). As antagonist
specimens, 3 types of metal alloys (Co-Cr, gold, and Ni-Cr alloys) were used. Twenty
cast crowns were prepared from each metal alloy in the shape of a maxillary premolar.
For each alloy, 10 cast crowns were randomly selected to oppose the smooth-surface
zirconia specimens and 10 to oppose the rough-surface zirconia specimens. A total
of 6 wear test groups were formed. Wear tests were performed by using a mastication
simulator at 240 000 mastication cycles. Wear on the antagonist specimens was measured
by using a laser 3D scanner. After wear testing, antagonist and substrate specimens
were inspected by using a scanning electron microscope (SEM). For statistical analysis
of the data, the 2-way ANOVA and the Scheffé multiple comparison tests were used (α=.05).
Results
Of the 6 test groups, the gold alloy specimens opposed to rough-surface zirconia exhibited
the most wear, while the Co-Cr alloy specimens opposed to smooth-surface zirconia
exhibited the least wear (P<.05). Rough-surface monolithic zirconia caused significantly more wear of the metal
alloy specimens than did smooth-surface monolithic zirconia (P<.01).
Conclusions
Increased surface roughness of monolithic zirconia was associated with increased wear
of the opposing dental alloy. When monolithic zirconia surface roughness was increased,
wear of dental alloys increased most for gold alloys, followed by Ni-Cr, and then
Co-Cr alloys.
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Article info
Publication history
Published online: October 22, 2019
Identification
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© 2019 by the Editorial Council for The Journal of Prosthetic Dentistry.
