Analysis of color and hardness of a medical silicone with extrinsic pigmentation after accelerated aging

Made available in DSpace on 2022-04-28T19:29:27Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-10-01 Objective The aim of this study is to evaluate the color alteration and shore A hardness of a medical silicone with extrinsic pigmentation, before and after accelerated aging. Materials and Methods Twenty samples (Silastic Q7-4735) were made with an intrinsic pigmentation. This intrinsic pigmentation was composed of a pink pigment (H-109-P, Factor II) and an opacifier (ZnO). All samples had standardized dimensions (45-mm diameter and 2-mm thickness). Half of the 20 samples manufactured subsequently received an extrinsic pigment (Tan FE-215, Factor II). Therefore, two groups were created (n = 10): Group 1, group with intrinsic pigmentation and without extrinsic pigmentation (control) and Group 2, group with intrinsic and extrinsic pigmentation. Samples were submitted to color and Shore A hardness tests, before and after 1,008 hours of aging. Statistical Analysis Color alteration data were submitted to Student's t -test (a = 0.05). Shore A hardness data were submitted to two-way analysis of variance and Tukey test (a = 0.05). Results The incorporation of the extrinsic pigment on the silicone did not affect its color (?E) when the two groups were compared (p = 0.232). Regarding the hardness test, the interaction between group and period did not interfere with the hardness results(p =0.599). However, the period factor showed that there was a reduction in the hardness of the silicone after aging (p < 0.05). Conclusion In this study, all the hardness and color results of the silicone used were clinically acceptable, regardless of the presence of extrinsic pigmentation. Department of Dental Materials and Prosthodontics São Paulo State University School of Dentistry Department of Pediatric and Social Dentistry São Paulo State University School of Dentistry Department of Dental Materials and Prosthodontics São Paulo State University School of Dentistry Department of Pediatric and Social Dentistry São Paulo State University School of Dentistry