Abstract
Statement of problem
Evaluating the effect of low-temperature degradation (LTD) on multilayered zirconia
blocks is important for the long-term life of zirconia restorations.
Purpose
The purpose of this in vitro study was to analyze the changes in color, translucency,
and hardness of a single layer of multilayered zirconia after an LTD treatment.
Material and methods
Ninety multilayered 10×10×1.0-mm zirconia specimens (3M Lava Esthetic) were designed
using Auto CAD 2006 (Autodesk) and divided into 6 groups (n=15) based on LTD (no treatment,
LTD treatment) and the inherent layer type (incisal, transition, and body). The hardness
of each specimen was measured using a microVickers hardness tester. The CIELab color
coordinates were measured using a spectrophotometer, and the data were used to calculate
the color difference and translucency (TP). Data were analyzed using 2-way ANOVA and
the Scheffé test (α=.05).
Results
LTD treatment did not alter the hardness of multilayered zirconia (P=.572). A significant difference was found in the hardness between the layers of multilayered
zirconia (P<.001). LTD treatment did not alter the b∗ or L∗ values (P=.773, P=.701) but did change the a∗ values (P<.001). On LTD treatment, the a∗ value was found to decrease. The L∗, a∗, and b∗ values
differed based on the respective layer within the material (P<.001). As layers progress from the incisal to the body, the L∗ value decreased and
the a∗ and b∗ values increased. In all groups, the color difference values were highest
in the following order: the incisal and transition layers < the transition and body
layers < the incisal and body layers. On LTD treatment, the color difference between
the layers decreased. The LTD treatment did not affect the TP value (P=.208), but the TP value for each layer showed a significant difference (P<.001).
Conclusions
LTD treatment did not affect the optical properties or hardness of the multilayered
zirconia. The hardness of the multilayered zirconia increased from the incisal to
the body layer. In multilayered zirconia, the brightness decreased from the incisal
to the body layer, and red and yellow color changes were observed. The TP of multilayered
zirconia increased from the incisal to the body layer.
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Article info
Publication history
Published online: February 18, 2023
Publication stage
In Press Corrected ProofIdentification
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© 2023 by the Editorial Council for the Journal of Prosthetic Dentistry.
