Abstract
Statement of problem
The addition of ultraviolet (UV) protectives may affect the materials’ mechanical
properties, which can limit the service life of facial prostheses.
Purpose
The purpose of this in vitro study was to investigate the effect of UV protectives
on the mechanical properties 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 UV protectives, benzophenone-3 (UV-BP),
ethylhexyl methoxycinnamate (UV-EM), titanium dioxide (UV-TD), and ethylhexyl salicylate
(UV-ES), at 0.5% and 1% concentrations by weight were incorporated into the silicone
before polymerization. The specimens were subjected to accelerated aging in a weathering
chamber for 300 and 600 hours and to thermocycling. The tensile strength and percentage
elongation, tear strength, and hardness of maxillofacial silicones were evaluated.
Data were analyzed by using 4-way ANOVA. The differences were compared by the Tukey
honestly significant difference test (α=.05).
Results
Tensile strength decreased after 300 and 600 hours of UV aging in 0.5% and 1% UV-BP
protective–added groups and increased in thermocycled groups (P<.05). Aging conditions generally showed no effect on the tensile strength of UV-EM,
UV-TD, and UV-ES added groups (P>.05). Aging generated a decrease in percentage elongation values compared with nonaged
specimens of groups (P<.05). The addition of UV protectives generally did not significantly affect the tear
strength of specimens compared with control in the aged groups (P>.05). The hardness of UV protective–added groups increased when compared with that
of nonaged groups after 300 and 600 hours of UV aging (P<.05). Also, thermally aged groups showed increased hardness than nonaged groups (P<.05).
Conclusions
The protective UV-BP addition caused decreased tensile strength, percentage elongation,
and tear strength in both concentrations. The UV-EM and UV-ES provided increases in
tensile strength and percentage elongation of the silicone in the 0.5% concentration.
The addition of UV-BP, UV-EM, and UV-ES did not make significant differences; however,
UV-TD significantly decreased the hardness values of the silicone.
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Article info
Publication history
Published online: August 02, 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, Ankara, Turkey, as a poster presentation on September 2018.
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
