Effect of Chemical Disinfection and Accelerated Aging on Color Stability of Maxillofacial Silicone with Opacifiers

Goiato, Marcelo Coelho; Haddad, Marcela Filié; Pesqueira, Aldiéris Alves; Moreno, Amália; Santos, Daniela Micheline dos; Bannwart, Lisiane Cristina

doi:10.1111/j.1532-849x.2011.00755.x

Cited by 42 publications

(65 citation statements)

References 25 publications

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“…36,37 In general, the samples incorporating NPs showed significantly greater color stability compared with the control group ( Table 2). 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.…”

supporting

confidence: 83%

“…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.…”

supporting

confidence: 83%

“…Accelerated aging may have caused degradation of the organic resin matrix, involving hydrolysis and decomposition of the polymeric chain. 32,40,55 The importance of maintaining and improving the properties of acrylic resin for ocular prosthesis use are well known. NPs are increasingly being used to improve the performance of polymeric materials.…”

Section: Discussionmentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

“…On the basis of these physical principles, protection may result from the absorption and dissipation of ultraviolet light by NPs, which act as a physical barrier by reflecting the light that reaches the prosthesis 22 and preventing discoloration. 40,41,43 Different types and proportions of NPs were used in this study, with different levels of color stability, not all of which protected against color degradation of the resin (Table 2). These differences may be due to variations in the amount of organic impurities mixed with NPs after different handling processes by the manufacturers.…”

mentioning

confidence: 99%

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

Andreotti

Goiato

Moreno

et al. 2014

IJN

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The aim of this study was to assess the effect of adding nanoparticles to N1 acrylic resin intended for artificial sclera, in terms of the color stability, microhardness, and flexural strength of the resin. Three hundred samples of N1 acrylic resin were used: 100 samples for color stability and microhardness tests (each test was performed on the opposite side of each sample), and 200 samples for flexural strength testing (100 samples before and after 1,008 hours of accelerated aging). Samples for each test were separated into ten groups (n=10), ie, without nanoparticles (control group) or with nanoparticles of zinc oxide, titanium dioxide (TiO 2 ), and barium sulfate at weight concentrations of 1%, 2%, and 2.5% (nanoparticle groups). Data were subjected to statistical analysis with nested analysis of variance and Tukey’s test ( P <0.05 significance level). Among the nanoparticle groups, the TiO 2 groups showed better color stability at all concentrations. Microhardness values increased after artificial aging, except for the control and zinc oxide groups. After aging, the 1%–2% TiO 2 groups had significantly higher microhardness values compared with the other nanoparticle groups. Before aging, there was a significant difference in flexural strength between the control and nanoparticle groups. After aging, the control and TiO 2 groups, regardless of concentration, showed the lowest flexural strength values. Incorporation of nanoparticles directly influenced the acrylic resin properties, with TiO 2 being the most influential nanoparticle in terms of the evaluated properties.

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