J Dent Rehabil Appl Sci.  2021 Dec;37(4):199-208. 10.14368/jdras.2021.37.4.199.

Effects of thickness and background on the masking ability of high -trasnlucent zirconias

• Kim YG
• Jung JH
• Kong HJ
• Kim YL

• KMID: 2525994
• DOI: http://doi.org/10.14368/jdras.2021.37.4.199

Abstract

Purpose
The purpose of this study was to compare and evaluate the masking ability of three types of high translucent zirconia according to the various thicknesses and backgrounds.
Materials and Methods
Using three types of high-translucency zirconia (Ceramill zolid fx white, Ceramill zolid ht+ white, Ceramill zolid ht+ preshade A2), 10 cylindrical specimens were fabricated in 10mm diameter and each with four thicknesses (0.6 mm, 1.0 mm, 1.5 mm, 2.0 mm), respectively by CAD/CAM method. The background was 10 mm in diameter and 10 mm in thickness. A1, A2, A3 flowable resin backgrounds, blue-colored core resin background, and Ni-Cr alloy background were prepared, and black, white backgrounds provided by the spectrophotometer manufacturer (x-rite, Koblach, Austria) were used. zirconia specimens and the background specimen were stacked to measure L, a*, b* with Spectrophotometer (Color i5, x-rite, Koblach, Austria) and the ∆E value with the other background is calculated. The Calculated mean ∆E values were compared based on perceptibility threshold 1.0 and acceptability threshold 3.7. Nonparametric tests such as Kruskal-Wallis test were performed to verify statistical significance (α = 0.05).
Results
There was a significant difference in the mean ∆E value according to the zirconia type, background and thickness change (P = 0.000).
Conclusion
According to the results of this study, the pre-colored high-translucent zirconia can obtain the desired zirconia shade when it is restored on teeth, composite resins, and abutments except for the blue resin core.

Keyword

zirconia; masking ability; translucency; thickness; background; spectrophotometry

Figure

• 

  Fig. 1 Zirconia specimens used in this study. (A) Ceramill zolid ht+ preshade A2, (B) Ceramill zolid ht+ white, (C) Ceramill zolid fx white, (D) 0.6 mm thickness, (E) 1.0 mm thickness, (F) 1.5 mm thickness, (G) 2.0 mm thickness.

• 

  Fig. 2 Backgrounds used in this study. (A) A1 flowable resin, (B) A2 flowable resin, (C) A3 flowable resin, (D) Luxacore Z smartmix dual (Blue), (E) Ni-Cr alloy (Metal), (F) black, (G) white.

• 

  Fig. 3 Measurement CIELa*b*. (A) Spectrophotometer Color i5 (x-rite, Michigan, USA) used in this study, (B) Diagram for measuring CIELa*b* by using spectrophotometer. a: 6 mm diameter aperture, b: D65, c: light reflection.

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  Fig. 4 ΔE for Ceramill zolid ht+ preshade A2 with other backgrounds based on A2 background at four different thicknesses. Different superscript letters in the same column represent statistically significant diffenrences in the column (P < 0.05).

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  Fig. 5 ΔE value for Ceramill zolid ht+ white with other backgrounds based on white background at four different thicknesses. Different superscript letters in the same column represent statistically significant diffenrences in the column (P < 0.05).

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  Fig. 6 ΔE value for Ceramill zolid fx white with other backgrounds based on white background at four different thicknesses. Different superscript letters in the same column represent statistically significant diffenrences in the column (P < 0.05).

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