Environmental Conditions Affecting Color Stability in Facial Elastomers (original) (raw)

Abstract

Objective: Colorants in facial prostheses fade after repeated weathering exposures. This study's purpose was to assess color stability of experimental glasses and commercial pigments following exposures to isolated components of weathering. Methods: Red (RG) and yellow (YG) glass powders (Kugler) were sieved to produce particle diameters <38 um. To achieve color saturation, powders were mixed 10% by weight into silica-filled, vinyl-terminated PDMS. Commercially pigmented mixtures containing functional intrinsic red (IR), extrinsic red (ER), intrinsic yellow (IY), extrinsic yellow (EY) were prepared (Factor II), plus an unpigmented mixture (U). Materials were polymerized into dumbbells (ASTM D412,n=10) and were weathered for 3000 h in UVB (0.72 J/cm2/h), heat (65C), humidity (80%r.h.), outdoors or control (darkness, 25C, 30%r.h.). Changes in L*a*b*E* color were measured and compared according to pigment and test condition (ANOVA/Tukey). Results: Greater color parameter changes...

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