Abstract
Statement of problem
Delamination of veneering ceramic is one of the most common challenges relating to
veneered zirconia restorations. Additive manufacturing (AM) is a fast-expanding technology
that has gained widespread acceptance in dentistry and is increasingly being used
to produce dental restorations. However, information about bonding of porcelain to
AM zirconia is lacking.
Purpose
The purpose of this in vitro study was to investigate the shear bond strength (SBS)
of porcelain to milled and additively manufactured zirconia, and the effect of surface
treatment on bond strength.
Material and methods
A Ø12×5-mm disk was designed virtually to fabricate all specimens, which were divided
into 2 groups according to the manufacturing technique: additively manufactured or
milled zirconia. The effect of airborne-particle abrasion and a zirconia liner before
porcelain application was investigated in both groups. Veneering porcelain was fired
into an alumina ring mold on the zirconia surface. SBS was measured by using a universal
testing machine at a crosshead speed of 1 mm/min before and after aging (n=10). SBS
data were analyzed with 3-way ANOVA (α=.05)
Results
A significant difference was found between milled and AM zirconia. The SBS of porcelain
to milled zirconia was significantly higher (1.38 MPa) than to AM zirconia (0.68 MPa)
(P<.001). The surface treatment of zirconia had no significant effect on porcelain SBS
in either group (P=.254), whereas thermocycling significantly reduced the SBS of porcelain to zirconia
in both milled and AM groups (P=.001).
Conclusions
Porcelain bonding to milled zirconia was better than to AM zirconia. Pretreating the
zirconia substrate before porcelain application did not improve the porcelain bond.
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Article info
Publication history
Published online: March 15, 2023
Publication stage
In Press Corrected ProofFootnotes
Funding: This research did not receive any specific grant from funding agencies in the public, commercial, or non-profit sectors.
Identification
Copyright
© 2023 by the Editorial Council for The Journal of Prosthetic Dentistry.
