Effect of artificial sweat, pigmentation and adhesives for fixing facial prostheses on physical and optical properties of two facial silicones
DOI:
https://doi.org/10.2340/biid.v12.44660Keywords:
facial silicone, adhesives, pigmentationAbstract
The aim of this study was to evaluate the effect of sweat and adhesives on color stability, roughness (Ra) and Shore A hardness of two silicones for facial prostheses with different pigmentation. Samples of Silastic MDX4-4210 and A-2186 silicone were made for the proposed tests, distributed into 12 groups according to their pigmentation and adhesive used and were immersed in artificial sweat for 3 months, disinfected every 3 days with neutral soap. Measurements of color stability, roughness and hardness were performed according to ISO 21920 and CIEDE2000 using a spectrophotometer and ISO 868, respectively. There was a statistically significant color change in the two silicones used, with the groups that had the least change being those without adhesive applied to their surface (controls). There was also a reduction in roughness in all groups, with MDX4-4210 being the roughest silicone. In terms of Shore A hardness, all the groups became harder after the experimental period, with A-2186 achieving the highest results. Color change, Shore A hardness and roughness showed significant changes in the MDX4-4210 and A-2186 silicones for the proposed tests. Even so, all the results found were clinically acceptable, making both silicones excellent options for use in maxillofacial rehabilitation.
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Copyright (c) 2025 Gabriele Martins , Daniela Micheline dos Santos, Bárbara Luise Medeiros dos Santos , Fernanda Pereira de Caxias, Marcelo Coelho Goiato
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Biomaterial Investigations in Dentistry is a Diamond Open Access peer-reviewed journal, publishing research in oral biomaterials science. The publishing of articles is free for authors, thanks to the support of Acta Odontologica Scandinavica Society (AOSS), a not-for-profit society. 
