Effect of different pigmentations, hygieneprotocols, and time on maxillofacial silicone properties

Le résumé fourni par la source

Objective: To evaluate the effects of pigmentation, hygiene protocols, and time on the physical, mechanical, and chemical properties, as well as the thermal behavior of MDX4-4210 and Silpuran 2420 silicones. Methods: Samples without pigmentation (WP;n=45), with intrinsic pigmentation (IP;n=45), and with intrinsic and extrinsic pigmentation (IEP;n=45) were tested. Samples were washed daily with neutral soap and immersed in water (control - C), washed daily with neutral soap and immersed in 2% hydrogen peroxide (HP2%), or washed daily with neutral soap and immersed in 0.15% triclosan (T0.15%) once a week for six months (T1). Subsequently, they were exposed to ultraviolet radiation and humidity, simulating 12 months (T2). Color, Shore A hardness, surface roughness, chemical properties, and thermal behavior were evaluated at T0, T1, and T2. Data were analyzed using a general linear model employing the Wald test and repeated measures for color and hardness changes, and ANOVA with Tukey’s post hoc test for surface roughness (α=0.05). Results: In MDX4-4210, WP and IEP had the greatest color change at T2 with T0.15% (p=0.020). IEP showed higher roughness at T1 and T2 but lower hardness variation (p<0.001). Hygiene protocols influenced roughness and hardness (p<0.05). In Silpuran, IEP had the highest color variation at T2, with reduced roughness and hardness, regardless of hygiene (p<0.001). Conclusion: IEP impacted color stability over time in both silicones when exposed to HP2% and T0.15%. Hardness changes did not compromise material quality. IEP groups showed lower roughness variation. Chemical and thermal behavior were unaffected by pigmentation or hygiene.

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