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Journal of Prosthetic Dentistry

Outdoor weathering of facial prosthetic elastomers differing in Durometer hardness

Published:November 25, 2014DOI:https://doi.org/10.1016/j.prosdent.2014.09.009

      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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