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Abstract
Five dry pigments and one maxillofacial elastomer were evaluated for color changes
(delta E) resulting from prolonged exposure to two types of ultraviolet light. The
elastomer, pigments, and pigmented elastomers were subjected to each ultraviolet light
source for 400, 600, and 1800 hours, and delta E color shifts were determined. The
unpigmented elastomer underwent minimally perceptible color change after 600 hours
of exposure to both types of ultraviolet light. Two pigments underwent substantial
color change after 400 hours, whereas the remaining three pigments remained color
stable after 1800 hours. It was concluded that for the materials tested, early color
changes in a prosthesis may be the result of degradation of certain ultraviolet light-susceptible
pigments, whereas longer term color shifts may be caused by color changes within the
elastomer.