Assessment of Color Difference of Translucent Zirconia Substructure Veneered Using a Layering Technique with Two Different Veneering Thicknesses: An in-vitro study
ABSTRACT
Background and objectives. The introduction of zirconia to the dental field created a path for development of new
designs and applications, but still, a minimum framework thickness of 0.5 mm with the remaining thickness of the
restoration used for building the ceramic veneer was always recommended. This might have possibly affected the final
shade of the restoration due to the whitish color of Y-TZP. This in vitro study was designed to assess the color
difference of translucent zirconia substructure veneered using a traditional layering technique with two different
veneering thicknesses. Methods. A total of twenty translucent Ice zirconia disc samples with standardized
dimensions 12 mm in a diameter, 0.5mm in thickness were designed and constructed using zirkonzahn system. The
samples were classified into two groups: Group I: (n = 10) veneered by 0.5 mm thickness layering technique using
IPS emax Ceram dentin shade A2. Group II (n = 10) veneered by 1 mm thickness layering technique using IPS emax
Ceram dentin shade A2. Twenty composite resin discs 12mm in diameter and 5mm in thickness in A3 shade, were
fabricated to be bonded to ceramic specimens using Dual-curing translucent rely X Unicem automix Self-Adhesive
Resin luting cement. Spectrophotometer was used to measure color parameters L*, a*, b* for all samples. ΔE values
were measured to determine color differences between the specimens and the A2 VITA classical shade (target shade).
ΔE values were compared with an acceptability threshold (ΔE=3.7). Independent t-test was used to analyze data
(P
Noora Berhaim , Nourelhouda Misurati, Milad Eshah, Mohamed Zeglam(7-2022)
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