Color stability of pigmented maxillofacial silicone elastomer: Effects of nano-oxides as opacifiers

Effect of Nano Silicon Dioxide Addition on Some Properties of Heat Vulcanized Maxillofacial Silicone Elastomer

“…The average of the five readings was calculated and considered the hardness number of the specimen. Disc sample with diameter of 20mm and thickness of 2mm was prepared for color change tests [15]. Light transmission test was done using a spectrophotometer (UV-160A; Shimadzu, Japan).…”

Evaluation of the effect of ultraviolet stabilizers on the change in color of a silicone elastomer following aging by three different methods:An in vitro study

“…[7][8][9][10]24 The strategies for stabilization of elastomers have included the use of UV stabilizers, thermochromic pigments and opacifiers. 7,[13][14][15][16][17] Such attempts at stabilization of elastomers have yielded mixed results. Kantola 14 found that thermochromic pigments were very sensitive to UV radiation and not suitable for prosthetic application whereas Kiat-amnuay 13 studied various concentrations of opacifiers and found that they prevent colour degradation overtime.…”

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

“…Samples were divided into ten groups (n=10), according to the NP type and concentration that was combined with the N1 acrylic resin, ie, without NPs (control group) and 1%, 2%, or 2.5% ZnO, TiO 2 , or BaSO 4 (for nine NP groups). 22 Samples in the color and microhardness tests were fabricated by a metallic matrix from silicone rubber disks (Zetalabor ® , Zhermack International, Rovigo, Italy) 3.0 cm in diameter and 0.3 cm in thickness. 24,25 To create the molds, the disks were embedded into two-part flasks (Classico Dental Products, São Paulo, Brazil) with type IV dental stone (Durone, Dentsply, Petrópolis, Rio de Janeiro, Brazil).…”

“…The addition of TiO 2 20 and ZnO to polymers can improve the mechanical and optical properties of polymers due to the small size, large specific area, and quantum effect of the NPs, as well as the strong interfacial interaction between the organic polymer and inorganic NPs. 21,22 The NPs hardly scatter any visible light, being optically transparent, specially due to their nanometer scale and low content, 22 in addition to exhibiting a high refractive index. 20 BaSO 4 is used in medical applications to examine the esophagus, stomach, and intestine by X-ray or computed tomography, as well as to confer higher radiopacity to rootend filling materials.…”

“…The studied NP concentrations are consistent with those in other studies in the literature, especially Han et al who evaluated the effects of 0.5%-3% nano-oxides on the properties of a commercially available pigmented maxillofacial silicone elastomer. 22 …”