Abstract
The physical and chemical stability of the intrinsic pigments for facial prosthesis was investigated in order to improve the color stability when using it.In the present study, TH/Red I and TH/Blue of SILSKIN® as intrinsic pigments and DOW CORNING® MDX-4-4210 as base elastomer were selected. The effects of the curing temperature and time (75°C: 80-260 minutes, 125°C: 40-130 minutes) in processing and the ultraviolet light irradiation (0-1, 008 hours) after processing on these pigments were evaluated by measuring the weight of the pigments in the materials.The findings were as follows:1. With regard to the curing temperature, the weight of both pigments did not change at 75°C but decreased at 125°C. The greatest degree of the decrease was observed at over 100 minutes of curing time. The degree of the decrease of TH/Blue was greater than that of TH/Red I.2. With regard to ultraviolet light irradiation after processing, the weight of the pigments decreased with the increase of the irradiation period. The degree of the decrease of TH/Red I was greater than that of TH/Blue.3. The effect of ultraviolet light irradiation after processing varied with TH/Blue according to the curing temperature but this was not observed with TH/Red I.
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