effect of disinfection on tensile strength and rupture elongation of maxillofacial silicone reinforced with nano-filler particles

Objectives: compare the tensile strength and rupture elongation of room temperature vulcanizing silicone (rtv), heat temperature vulcanizing silicone (htv) and 3% sio2 reinforced rtv and htv following disinfection with various agents.materials and methods: according to astm d412, 384 samples were fabricated using htv, rtv, rtv and htv reinforced with 3% sio2 nanoparticles. the control group received no disinfection treatment, while the other samples were disinfected for 10 minutes using neutral soap, 4% chlorhexidine, and ozone water, three times a day for 60 days. additionally, accelerated aging was carried out for 252,504,1008 hours. tensile strength and rupture elongation were assessed using a universal testing machine at 500 mm/min speed, and the mean values were analyzed using two-way anova and tukey hsd test (p<0.05).results: the mean value of tensile strength of rtv (2.96 ± 0.41), 3%sio2 rtv (3.26 ±0.33), htv (3.30 ±0.36),3% sio2 htv (4.07 ±0.85) mpa which was statistically significant for control, neutral soap and 4% chlorhexidine at 252,504 ,1008 hours of aging. (p <0.05). the percentage of elongation of rtv (545 ±29.2),3%sio2 rtv (617 ±30.5), htv (735 ±48.7),3% sio2 htv (801 ±55.7) which was statically significant for control, neutral soap, 4% chlorhexidine and ozone water for 252, 504 ,1008 hours of aging. (p <0.05).conclusion: the htv silicone showed more tensile strength and rupture elongation compared to htv, rtv and rtv silicones reinforced with 3% sio2 nanoparticles. ozone water disinfection had least effect on tensile strength and rupture elongation of maxillo-facial silicone compared to other disinfectant.