Abstract: Objective To study the color stability of prosthesis silicone elastomer covered by different concentrations of silica alumina coated nanoTiO2 membrane cap,and to improve the effectiveness of facial prostheses silicone rubber color stability with this method so as to provide a theoretical basis.Methods MDX44210 silicone elastomer as substrate,nanoTiO2 coated with Si and Al as masking agent,and cadmium red oil paint as coloring agent,L* a* b* values of specimen were observed when stamped with 1mm thickness,different concentrations (0,0.05%,0.10%,0.15%) of silica alumina nanoTiO2 coated silicone rubber membrane before and after aging.Results As the concentration of silica alumina coated nanoTiO2 decreased,ΔE,ΔL*,Δa*,Δb* values of 0.10% group were the lowest,but the those of 0.15% group increased,and there was a significant difference between groups (P<0.05).Conclusions Coating nanoTiO2 membrane cap with different concentrations of silica alumina has a certain role in delaying fade prosthesis silicone elastomer,which provides a new idea for improving color silicone elastomer prosthesis stability.

Key words: silicone elastomer, prosthesis, opacifiers, nanoTiO2