Abstract
Statement of problem
Adhesive cementation is the most common bonding strategy for zirconia restorations.
Although cementation with a bioactive luting agent has been proposed as an alternative,
how the bond strength compares is unclear.
Purpose
The purpose of this in vitro study was to evaluate shear bond strength after cementing
a monolithic zirconia ceramic to human dentin with a bioceramic cement, compare it
with a traditional cement, and evaluate its bioactive properties.
Material and methods
A total of 120 dentin specimens and 120 yttria-stabilized tetragonal zirconia polycrystal
(Y-TZP) (BruxZir) cylindrical specimens were used. Zirconia and dentin specimens were
randomly divided into 8 study groups (n=15) based on 2 luting cement types (a bioceramic
cement or glass ionomer cement as control), 2 airborne-particle abrasion protocols
(50 μm or 110 μm), and 2 water storage durations (24 hours or 30 days). After the
shear bond strength test using a universal machine at a crosshead speed of 1 mm/min,
fracture patterns were evaluated under a stereomicroscope and a scanning electron
microscope. Strength values were statistically analyzed with a 3-factor ANOVA model
(α=.05). Bioactivity was evaluated in simulated body fluid (SBF).
Results
The control glass ionomer cement achieved significantly greater shear bond strength
compared with the tested bioceramic cement. Mean bond strength values ranged from
2.52 MPa to 5.23 MPa for the bioceramic cement tested and from 4.20 MPa to 6.61 MPa
for the control cement. The duration of water storage played a significant role in
the bond strength, with groups stored for 30 days reaching higher bond strength values,
whereas the particle size of airborne-particle abrasion did not have a significant
effect. Failure types were primarily mixed. No apatite formation was recorded on the
surface of the specimens even after 30 days of immersion in SBF.
Conclusions
The evaluated cement did not develop apatite in SBF, and its bond strength values
were below the control glass ionomer cement.
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Article info
Publication history
Published online: July 17, 2019
Identification
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© 2019 by the Editorial Council for The Journal of Prosthetic Dentistry.
