Abstract
Statement of problem
Translucent zirconias have been developed with better esthetics than high-strength
zirconias by reducing opacity. However, studies on their translucency and strength
are sparse.
Purpose
The purpose of this in vitro study was to compare the relationship between translucency
and biaxial flexural strength of recently developed high-translucency zirconia, high-strength
zirconia, and lithium disilicate ceramics.
Material and methods
Disks (n=12) were fabricated for 5 ceramic materials: high-strength zirconia (BruxZir
16 shaded), translucent zirconia (BruxZir Anterior shaded, Katana UTML, Katana STML),
and lithium disilicate (IPS e.max, Press HT, and LT). A standard tessellation language
(STL) file was designed, and the specimen milled, finished, and glazed according to
manufacturer's instructions for each material. The translucency parameter was calculated
against black and white backgrounds and white and stump shade with ND4 background
by using a spectrophotometer. Biaxial flexural strength was calculated by using the
3-ball test. The load was applied at a crosshead speed of 0.5 mm/min with a 49-N load
cell until failure occurred. Translucency parameter and biaxial flexural strength
data were analyzed with 1-way analysis of variance (ANOVA). A Tukey honest significant
difference multiple comparison test was used to determine significant differences
(α=.05).
Results
The IPS e.max HT was more translucent against both backgrounds (32.85 for black/white
and 15.34 for white/stump), while BruxZir 16 was the least translucent (19.78 for
B/W and 8.83 for W/S). All groups tested differed in translucency (P<.001) except for BruxZir Anterior and Katana STML, which were not significantly different
(P=.052). For biaxial flexural strength, BruxZir 16 had the highest strength (995.44
MPa) and e.max HT, the lowest (186.75 MPa). No significant differences were found
between BruxZir anterior and Katana STML, Katana UTML and IPS e.max LT, or IPS e.max
LT and IPS e.max HT (P>.05). Translucency parameter values using both backgrounds were strongly correlated
(r=0.99). However, biaxial flexural strength values were inversely related to translucency
parameter values when using black/white and white/stump shade but with high correlation
(r=-0.777 and -0.756 respectively).
Conclusions
Lithium disilicate was the most translucent and yet the weakest material, whereas
high-strength zirconia was the most opaque ceramic and the strongest. Katana UTML
had the highest translucency but was weakest among translucent and high-strength zirconia
materials. Overall, translucency was negatively correlated with biaxial flexural strength.
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Article info
Publication history
Published online: July 22, 2021
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
