Abstract
Statement of problem
Resistance to long-term color change is a desirable property for facial prosthetic
elastomers. Evidence for the color stability of maxillofacial silicones under aging
and hot and humid Indian weathering conditions is lacking.
Purpose
The purpose of this in vitro study was to evaluate the effect of adding opacifiers
on the color stability of maxillofacial silicone under human aging and Indian weather
conditions.
Material and methods
A total of 93 specimen disks were obtained from the A-2186, platinum-based, room-temperature
vulcanized, maxillofacial silicone elastomer by using a Ø30×6-mm stainless-steel die.
The specimens were divided into 3 main groups (n=30), C (control), T (titanium dioxide),
and B (barium sulfate), and 1 additional specimen (n=1) from each group was stored
in a closed box and further subgrouped as outdoor weathering (COut, TOut, BOut), acidic
perspiration (CAcid, TAcid, BAcid), sebum (CSebum, TSebum, BSebum) (n=10), and visual
comparison (CVis, TVis, BVis) (n=1). Baseline L∗, a∗, b∗ values were recorded by using
a spectrophotometer and visual perception. The specimens were subjected to human and
extraoral aging conditions, and the values were recorded again after 6 months. Data
were analyzed statistically by using analysis of variance (ANOVA) and post hoc analysis
with the Tukey post hoc test.
Results
In group C, the mean color change for COut was 3.69 ±0.49; CAcid, 3.58 ±0.68; and
CSebum, 7.53 ±0.22 (P<.001). In group T, the mean color change for TOut was 2.60 ±0.24; TAcid, 2.35 ±0.13;
and TSebum, 4.91 ±0.44 (P<.001). In group B, BOut was 1.59 ±0.28, BAcid was 1.46 ±0.28, and BSebum was 4.03
±0.71 (P<.001). The specimens containing barium sulfate showed the maximum color stability.
The least color stability was observed in all specimens exposed to sebum solution
and was significantly different (P<.001) from the outdoor weather and acidic perspiration specimens. Visually perceivable
color changes were observed in specimens exposed to the sebum solution.
Conclusions
The addition of titanium dioxide and barium sulfate as opacifiers resulted in clinically
acceptable color change when exposed to outdoor weathering and acidic perspiration
but not in sebum solution.
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Article info
Publication history
Published online: October 11, 2021
Footnotes
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
