Abstract
Statement of problem
High-translucency monolithic multilayer precolored zirconia provides acceptable esthetics
and eliminates chipping of the veneering porcelain. However, the color is not always
consistent with the standard Vita shade guide, and the color saturation may vary with
the thickness of the zirconia.
Purpose
The purpose of this in vitro study was to characterize the effect of thickness on
the color accuracy of high-translucency monolithic multilayer precolored zirconia.
Material and methods
Plate-shaped (20×20 mm) Vita A2 shade high-translucency monolithic multilayer precolored
zirconia specimens of 3 types (SHT Multilayer, AT Multilayer, and 3D Multilayer) in
4 thicknesses (0.5, 1.0, 1.5, and 2.0 mm) were fabricated (N=120, n=10). A spectrophotometer
was used to measure the color attributes (CIELab) against gray or A2 substrates to
evaluate the color accuracy based on differences in color (ΔE) (versus the Vita shade
guide) and chroma. Statistical analysis was performed by using the Pearson correlation,
2-way ANOVA, and post hoc Scheffé test (α=.05).
Results
Against gray substrates, thickness was significantly positively correlated with all
color attributes. Against A2 substrates, L∗ values increased with an increase in thickness;
however, a∗, b∗, and chroma values remained stable. Zirconia with a thickness of 1.0
mm exhibited the lowest ΔE, regardless of the type, except for AT Multilayer against
A2 substrates, where the lowest ΔE was achieved at 0.5 mm. At thicknesses ≥1.0 mm,
the ΔE between the 2 substrates was imperceivable.
Conclusions
Thickness affected the color accuracy of different high-translucency monolithic multilayer
precolored zirconia types. It appears that the optimal thickness in terms of color
accuracy is 1.0 mm. These results could be used as a reference for the selection and
preparation of abutments in clinical applications.
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Article info
Publication history
Published online: August 23, 2021
Footnotes
C.-M. K. and T.-Y. P. contributed equally to this work.
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
