Abstract
Statement of problem
Silicone elastomers have been widely used for rehabilitation of facial defects for
more than 50 years. However, color change is the most common problem limiting the
service life of facial prostheses. Whether the addition of ultraviolet protectives
may enhance color stability of these materials is unclear.
Purpose
The purpose of this in vitro study was to investigate the effect of ultraviolet protectives
on the color stability of maxillofacial silicones after artificial aging.
Material and methods
Six color groups (unpigmented, white, yellow, red, blue, and mixed) of addition-type
maxillofacial silicone were prepared. Four ultraviolet protectives benzophenone-3,
ethylhexyl methoxycinnamate, titanium dioxide, and ethylhexyl salicylate at 0.5% and
1% concentrations by weight were incorporated into the silicone before polymerization.
The specimens were artificially aged in an accelerated weathering chamber for 300
and 600 hours and in a thermocycling device. The color change values (E) of the maxillofacial
silicones were evaluated. Data were statistically analyzed by using 4-way ANOVA. The
differences were compared by the Tukey honestly significant difference test (α=.05).
Results
Benzophenone-3 and ethylhexyl methoxycinnamate protectives did not reduce the ΔE values,
and the 1% titanium dioxide groups exhibited lower ΔE values than the 0.5% titanium
dioxide groups. Ethylhexyl salicylate protective generally reduced the ΔE values significantly
in all color and aging groups when compared with the control groups (P<.05). In all control and ultraviolet protective groups, the highest ΔE values were
seen with the red color in 300 and 600 hours of aging. Generally, no significant difference
(P>.05) was seen in the ΔE values, which were clinically acceptable among the thermocycled
color groups. After 600 hours of accelerated aging, the ΔE values were found to be
higher than the values of 300-hour aging.
Conclusions
Ethylhexyl salicylate protective incorporated into maxillofacial silicones may improve
color stability.
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Article info
Publication history
Published online: July 28, 2021
Publication stage
In Press Corrected ProofFootnotes
Support provided by The Scientific and Technological Research Council of Turkey (TÜBİTAK), grant no.215M738.
Presented at the 24th Turkish Dental Association (TDA) International Dental Congress as a poster presentation, Ankara, Turkey, September 2018.
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
