Abstract
Statement of problem
Facial prosthetic elastomers with wide ranges in hardness are available, yet material
weatherability is unknown.
Purpose
The purpose of this study was to assess color, Durometer hardness, and tensile property
changes after 3000 hours of outdoor weathering.
Material and methods
Unpigmented elastomers with Durometer hardness 5, 30, 50, 70, and A-2186 were polymerized
into dumbbells (ASTM D412) and disks, 34 mm in diameter by 6 mm thick. Materials were
subjected to outdoor or time passage environments for 3000 hours. CIELab color (n=5),
Durometer hardness (n=5), and tensile mechanical properties (n=10) were measured at
0 and 3000 hours, and group differences were assessed by material and weathering condition
(ANOVA/Tukey, α=.05).
Results
Except for A-2186, the mean Durometer changes for all materials were 1 unit or less,
with no significant differences observed between time passage and weathered groups
(P≥.05). Three-thousand-hour tensile mechanical property results demonstrated nonsignificant
differences between time passage and weathered materials but significantly changed
properties from immediately tested materials (P<.001). Outdoor weathering induced perceptible but acceptable color changes (1.7≤ΔE*≤2.6)
for elastomers with Durometer hardness 5 and 30 and A-2186.
Conclusions
With a few exceptions, outdoor weathering produced relatively small changes in color,
Durometer hardness, or tensile properties compared with time passage.
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Article info
Publication history
Published online: November 25, 2014
Footnotes
This study was supported by the University of Nebraska College of Dentistry Summer Student Research Fellowship Project FY 12-07.
Identification
Copyright
© 2015 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
