Effects of thickness and background on the masking ability of high -trasnlucent zirconias
10.14368/jdras.2021.37.4.199
- Author:
Young-Gon KIM
1
;
Ji-Hye JUNG
;
Hyun-Jun KONG
;
Yu-Lee KIM
Author Information
1. Department of Prosthodontics, College of Dentistry, Wonkwang University, Iksan, Republic of Korea
- Publication Type:Original Article
- From:Journal of Dental Rehabilitation and Applied Science
2021;37(4):199-208
- CountryRepublic of Korea
- Language:English
-
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.
