Interactions of pigments and opacifiers on color stability of MDX4-4210/type A maxillofacial elastomers subjected to artificial aging

Influence of nanoparticles on color stability, microhardness, and flexural strength of acrylic resins specific for ocular prosthesis

“…Several studies have found satisfactory results by incorporating nanoparticles (NPs) into polymeric materials (mainly silicone elastomers used for facial prostheses), in terms of protecting such materials from degradation. [10][11][12][13][14][15][16] Research has…”

“…This finding is consistent with the results of other studies, 10,11,[38][39][40] which showed that addition of ZnO, TiO 2 , or BaSO 4 to polymeric materials can increase the longevity of maxillofacial prostheses by promoting maintenance of color. 10,12,[38][39][40] NPs are widely used, especially in sunscreen lotions, as inorganic absorbers of ultraviolet light. 22,38,41,42 Inorganic NPs differ from some organic ultraviolet absorbers, in that they do not migrate in the polymeric matrix.…”

“…Various studies have shown that TiO 2 exhibits the best color protection results among studied NPs. 10,12,40 As a NP decreases in size, it offers increasing protection against ultraviolet light.…”

Color stability of maxillofacial silicone with nanoparticle pigment and opacifier submitted to disinfection and artificial aging

“…5,[9][10][11][12][13] Silicone prostheses are considered color effective for about six months up to one year, and afterward must be redone. 4,9,10,12 The instability of observed color is attributed to the constant exposition to ultraviolet (UV) light, air pollution, pigment additions, 3,4,[13][14][15][16][17][18][19] and the use of cleansing products. 9,11,20,21 Literature has shown that intrinsic addition of opacifiers to facial silicones promoted longer color maintenance.…”

“…9,11,20,21 Literature has shown that intrinsic addition of opacifiers to facial silicones promoted longer color maintenance. [17][18][19] Among the opacifiers commercially available, Barium sulfate (BaSO 4 ) is mentioned. It consists in a white powder, insoluble in water and organic fluids, used in the industry to achieve the white color in paints, glass, and photographic papers.…”