Abstract
Statement of problem
Whether the incorporation of ultraviolet-protective 2-ethylhexyl salicylate (UV-ES)
affects the mechanical properties of different maxillofacial silicone elastomers,
limiting the service life of facial prostheses, is unclear.
Purpose
The purpose of this in vitro study was to examine the mechanical properties of different
maxillofacial silicone elastomers incorporating different ratios of UV-ES.
Material and methods
Three different ratios of UV-ES were incorporated into 3 different types of maxillofacial
silicones (M511, TechSil-25, and A-2000), and the mechanical properties of the silicones
were investigated. Silicone pigments were added to each silicone type to mimic skin
color. Dumbbell-shaped specimens were fabricated for tensile strength, percentage
elongation, and hardness measurements, and trouser-shaped specimens for tear strength
measurement. A total of 240 specimens were prepared. UV-ES in 3 different ratios (1%,
2%, and 5%) and a control group of each silicone type were generated (n=10). The effects
of maxillofacial silicone type and ultraviolet protective ratios on hardness, tensile
strength, percentage elongation, and tear strength were examined by factorial ANOVA
(α=.05).
Results
The Shore-A hardness in the control and UV-ES added groups was not significantly different
in M511 material (P>.05), and a statistically significant decrease was observed in all ratios in TechSil
S-25 and A-2000 silicones (P<.05). After adding 1%, 2%, and 5% UV protective into the silicones, the tensile strength
and elongation of TechSil S-25 silicone material decreased significantly (P<.05), while these mechanical properties of M511 and A-2000 were not affected by UV-ES
addition (P>.05). Tensile and tear strength values of the silicone elastomers were highest for
TechSil S-25.
Conclusions
The mechanical properties of M511 and A-2000 silicone elastomers were not adversely
affected by the addition of 1%, 2%, or 5% UV-ES.
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Article info
Publication history
Published online: January 11, 2023
Publication stage
In Press Corrected ProofFootnotes
Funding: Supported by The Scientific Research Project Coordination Unit of Gazi University, Turkiye grant no. 03/2020-16.
Identification
Copyright
© 2022 by the Editorial Council for the Journal of Prosthetic Dentistry.
