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Evaluation of hardness and surface roughness of two maxillofacial silicones following disinfection Abstract: The purpose of this study was to evaluate the Shore A hard-ness and surface roughness of two silicones for maxillofacial prosthet-ic treatment, under the infl uence of chemical disinfection and storage. Twenty-eight specimens were obtained, half of which were made of Si-lastic MDX 4-4210 silicone and, the other half were made of Silastic 732 RTV silicone. The specimens were divided into four groups: Silastic 732 RTV and MDX 4-4210 with disinfection 3 times a week with Efferdent tablets and the same materials without disinfection. The hardness of the materials was analyzed with a Shore A Durometer. The surface rough-ness was established by a digital portable roughness tester, initially and 2 months after the confection of the specimens. A variance test was applied (2-way ANOVA), followed by Tukey test (the level of signifi cance was set at 1%). The storage time factor statistically infl uenced (p < 0.01) the materials ’ properties of hardness and roughness. MDX 4-4210 (28.59 Shore A, 0.789 Ra) presented higher values than Silastic 732 RTV (18.08 Shore A, 0.656 Ra) for both properties. Regarding the disinfection pe-riod, there was no signifi cant difference in any of the materials tested