Effect of Extraoral Aging Conditions on Mechanical Properties of Facial Silicone Elastomer Reinforced With Titanium-Oxide Nanoparticles (In Vitro Study)

Abstract

INTRODUCTION: Investigators have been searching for ideal maxillofacial prosthetic materials in order to gain patient acceptance and can be fabricated easily in the dental setting. OBJECTIVES: To evaluate the influence of adding different concentrations of titanium oxide nanoparticles (TiO2 NPs) on the mechanical properties of facial silicone elastomer (SE) after different extra-oral aging methods. MATERIALS AND METHODS: TiO2 nanoparticles were mixed with MED-4210 maxillofacial silicone elastomer at 1.5 %, 2% and 2.5 % weight percentage (w/w). Unmodified silicone was served as control group. Each of the above groups were evaluated to mechanical properties before aging conditions. Control & 2.5% nano-TiO2 silicone elastomers groups were subjected to six equal aging conditions groups as follow. Dry storage in dark for 6 months, storage in simulated sebum solution for 6 months, storage in simulated acidic perspiration for 6 months, accelerated artificial daylight weathering for 360 hours, storage in antimicrobial silicone-cleaning solution for 30 hours and mixed aging of sebum under UV light for 360 hours. After aging exposures, they were evaluated to the mechanical properties. Data were analyzed using the Kolmogorov-Smirnov test, F-test (ANOVA) and Post-hoc pair-wise test. RESULTS: TiO2 nanoparticles addition improved the mechanical properties in terms of tensile strength and percentage elongation, tear strength and shore A hardness of MED-4210 maxillofacial silicon elastomer before and after extra-oral aging conditions (P < 0.05). Pair-wise comparison between control group and 2.5% nano-TiO2 silicone elastomers composite exhibited significant differences according to the mechanical properties after aging. CONCLUSIONS: Reinforcement of MED-4210 maxillofacial silicon elastomer with TiO2 nanoparticles introduces a favorable material with physical and anti-ageing properties in our in vitro study.

Effect of Disinfection on the Physical Properties of Maxillofacial Silicone Material : A Systematic Review

“…The routine method used currently to prevent biofilm formation on silicone facial prostheses is to instruct patients to clean their prostheses meticulously. Silicone materials are more difficult to clean than resins as these materials are permeable so are more susceptible to microbial colonization [32]. Neutral soap, gentle brushing using a soft nylon bristles A variety of cleansing agents like CHX and isopropyl alcohol have been recommended.…”