Dhuha A. Shakir, Faiza M. Abdul-Ameer
Abstract: Background After 4-14 months of clinical use silicone elastomers may subjected for degradation, despite of they have a desirable properties like, easy coloration, easy manipulation, , and biocompatibility. The purpose of this study was to evaluate the effect of addition TiO2 nanofiller on thecolor stability of VST50F (RTV) and Cosmesil M511 (HTV) maxillofacial silicone elastomer. Materials and methods 60 samples were fabricated by addition of 0.25wt % TiO2 nanofiller with 0.25 wt. % of intrinsic pigment (cream) for VST50F and 0.2 wt % of nano TiO2 with 0.25 wt. % of intrinsic pigment (cream) for M511 maxillofacial silicone elastomer. According to pilot study, 0.25wt % and 0.2wt % of nano TiO2 with 0.25 wt. % intrinsic pigment reinforcement revealed superior properties (tear strength, and hardness shore A). The main study samples were divided into three (3) groups for both silicone material, which wrer divided into (A control pure silicone without nano TiO2, B silicone incorporated with nano TiO2 and C, silicone incorporated with nano TiO2 and intinsic pigment ) each group contains (10) samples, then each group was tested by vita easy shade test and spectrophotometer test.The samples were tested before and after artificial ageing and the data were analyzed with a descriptive statistical analysis, three -way ANOVA. Results The addition of 0.25wt % of TiO2 nanofiller into VST50F maxillofacial elastomer and 0.2wt % of TiO2 nanofiller into comensil M511and the addition of intrinsic pigment with nano TiO2 resulted in a highly increase in mean values of the color change, after subjected to artifacial ageing for both silicone elastomer materials. Conclusion Reinforcement of nano TiO2 with specific concentrations for each VST50F and Cosmesil M511 maxillofacial silicone materials were increase the service life of the prosthesis, but did not protect the silicone matrix from artificial aging degradationof both VST50F and Cosmesil M511 maxillofacial silicone materials.
Keywords: Maxillofacial silicone elastomer, VST50F silicone elastomer, Cosmesil M511silicone elastomer, nano TiO2, , intrinsic pigments, artifical ageing