Available online 23 November 2018
The
study was presented as an oral presentation during the 47th Meeting of
the International Association for Dental Research Continental European
Division held during 15-17 October 2015 in Antalya, Turkey.
Abstract
Statement of problem
A
good color match combined with a proper translucency match results in
excellent esthetics for a metal-free restoration, yet basic color and
translucency comparisons between available zirconia systems are not well
described.
Purpose
The purpose of this
in vitro study was to compare the color and translucency of commercially available zirconia materials.
Material and methods
Eight
specimen disks were formed in each of the single-layer (0.5-mm thick)
groups and double-layer (0.5-mm zirconia with 1.0-mm porcelain) groups
for each of 5 zirconia-based substructure systems. Colors on black,
gray, and white backings were used to obtain CIEDE2000 color differences
between the zirconia systems in the layering groups and to obtain
relative translucency parameter (RTP) values. Color differences were
compared with perceptibility and acceptability thresholds, and
comparisons in RTP were made using analyses of variance and the
Bonferroni corrected Student t tests (α=.05).
Results
The
Shrout-Fleiss random set reliability for the duplicate L*
determinations was 0.9992, 0.9756 for a*, and 0.9959 for b*. Although
some mean color differences were below or at the perceptibility
threshold, most differences were at or above the acceptability
threshold. For the single-layer configuration, 1 material system had
higher RTP values than every other material (P<.001), and another material had lower RTP values than every other material (P<.001).
Conclusions
The results of this study present significant differences in both color and translucency among 5
ceramic substrate
systems when studied in single layers. Perceivable and often
unacceptable differences in color were also found among these materials
when layered with porcelain.
It is concluded that the esthetics of restorations which use a ceramic
substrate is notably affected by the ceramic system used.
Comments