EFFECT OF EXTRAORAL AGING CONDITIONS ON MECHANICAL PROPERTIES OF FACIAL SILICONE ELASTOMER REINFORCED WITH TITANIUM-OXIDE NANOPARTICLES (IN VITRO STUDY)

Document Type : Original Article

Authors

1 Bachelor of Dentistry, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.

2 Professor of Removable Prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.

3 Assistant Professor of Dental Biomaterials, Faculty of Dentistry, Alexandria University, Alexandria, Egypt

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.

Keywords

Main Subjects

References

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Alexandria Dental Journal
Volume 45, Issue 3
December 2020
Pages 29-36

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