Abstract
Statement of problem
Anterior shade matching is an essential factor influencing the esthetics of a ceramic
restoration. Dentists face a challenge when the color of an implant abutment creates
an unsatisfactory match with the ceramic restoration or neighboring teeth.
Purpose
The purpose of this in vitro study was to evaluate the influence of abutment material
and ceramic thickness on the final color of different ceramic systems.
Material and methods
Four experimental and control ceramic specimens in shade A3 were cut from IPS e.max
CAD, IPS Empress CAD, and VITA Suprinity PC blocks. These specimens had thicknesses
of 1.0 mm, 1.5 mm, 2.0 mm, and 2.5 mm, respectively, for the experimental groups,
and 4 mm for the controls. Background abutment specimens were fabricated to yield
3 different shades: white zirconia, yellow zirconia, and titanium at a 3-mm thickness.
All 3 ceramic specimens in each thickness were placed in succession on different abutment
backgrounds with glycerin optical fluid in between, and the color was measured. A
digital spectrophotometer was used to record the specimen color value in the Commission
Internationale De L'éclairage (CIELab) color coordinates system and to calculate the
color difference (ΔE) between the control and experimental groups. The Kruskal-Wallis
test was used to analyze the effect of ceramic thickness on different abutments, and
the pair-wise test was used to evaluate within the group (α=.05).
Results
The color differences between the test groups and the control decreased with increasing
ceramic thickness for every background material. In every case, significant differences
were found between 1.0- and 2.5-mm ceramic thicknesses. Only certain 2.5-mm e.max
CAD, VITA Suprinity PC, and Empress CAD specimens on yellow-shade zirconia or VITA
Suprinity PC on titanium were identified as clinically acceptable (ΔE<3).
Conclusions
Increasing ceramic restoration thickness over the abutment background decreased the
color mismatch. Increasing the thickness of ceramic on a yellow-shaded zirconia abutment
rather than on titanium or white zirconia yielded a more esthetic color for the whole
restoration.
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Article info
Publication history
Published online: September 16, 2017
Identification
Copyright
© 2017 by the Editorial Council for The Journal of Prosthetic Dentistry.
