The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Aldi??ris Alves Pesqueira - One of the best experts on this subject based on the ideXlab platform.
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Effect of different methods of hygiene on the color stability of extrinsically pigmented facial silicone
Brazilian Journal of Oral Sciences, 2018Co-Authors: Yasmin Morais Cabral, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Marcela Filié HaddadAbstract:Evaluate the color stability of facial silicone pigmented extrinsically under the influence of the hygiene process. Methods: 160 samples were prepared and divided into 8 groups (n = 20) according to the pigmentation technique used: Group 1: Colorless silicone; Group 2: Pigmented exclusively with oil ink; Group 3: Pigmented with oil ink + Opacifier; Group 4: Colorless, applying Prime; Group 5: Pigmented with oil ink covered with Prime; Group 6: Pigmented with oil ink + Opacifier and covered with Prime; Group 7: Pigmented with oil ink diluted in Prime; Group 8: Pigmented with oil ink + Opacifier diluted in Prime. Then the samples were distributed into two subgropus (n=10): 1: neutral soap and 2: 1% hypochlorite solution. The color readings occurred in the initial period and 60 days after the hygiene procedures. For this, it was used a spectrophotometer reflection and CIE-Lab program. The data was tabulated and submitted to analysis of variance (ANOVA) followed by Tukey test (p
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Effect of addition of pigments and Opacifier on the hardness, absorption, solubility and surface degradation of facial silicone after artificial ageing☆
Polymer Degradation and Stability, 2012Co-Authors: Daniela Micheline Dos Santos, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Stefan Fiuza De Carvalho Dekon, Aimée Maria GuiottiAbstract:The physical properties of silicone prostheses can be influenced by materials used for aesthetic detailing. The purpose of this study was to investigate the effect of two pigments and one Opacifier on hardness, absorption, and solubility of a facial silicone subjected to accelerated ageing. Silicone specimens were fabricated with or without pigments and Opacifier. 120 specimens were produced, with half being used for hardness testing and the other half for absorption and solubility tests. The specimens were divided into the following 6 groups (n = 20) according to whether they were made with nanofiller with pigments and Opacifier: colourless (I), colourless with Opacifier (IO), ceramic (C), Opacifier with ceramic (OC), oil (O), and oil with Opacifier (OO). The specimens were subjected to accelerated ageing for 1008 h. Hardness, absorption, and solubility were measured at baseline (B) and after 253 h (A1), 504 h (A2), and 1008 h (A3) of accelerated ageing. The data were analysed by 2-way repeated-measures analyses of variance (ANOVA) and Tukey's HSD test (α = 0.05). The lowest hardness values were obtained for the O and OO groups (ps
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effect of addition of pigments and Opacifier on the hardness absorption solubility and surface degradation of facial silicone after artificial ageing
Polymer Degradation and Stability, 2012Co-Authors: Daniela Micheline Dos Santos, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Stefan Fiuza De Carvalho Dekon, Aimée Maria GuiottiAbstract:The physical properties of silicone prostheses can be influenced by materials used for aesthetic detailing. The purpose of this study was to investigate the effect of two pigments and one Opacifier on hardness, absorption, and solubility of a facial silicone subjected to accelerated ageing. Silicone specimens were fabricated with or without pigments and Opacifier. 120 specimens were produced, with half being used for hardness testing and the other half for absorption and solubility tests. The specimens were divided into the following 6 groups (n = 20) according to whether they were made with nanofiller with pigments and Opacifier: colourless (I), colourless with Opacifier (IO), ceramic (C), Opacifier with ceramic (OC), oil (O), and oil with Opacifier (OO). The specimens were subjected to accelerated ageing for 1008 h. Hardness, absorption, and solubility were measured at baseline (B) and after 253 h (A1), 504 h (A2), and 1008 h (A3) of accelerated ageing. The data were analysed by 2-way repeated-measures analyses of variance (ANOVA) and Tukey's HSD test (α = 0.05). The lowest hardness values were obtained for the O and OO groups (ps < 0.05 vs. other groups). Absorption and solubility did not differ between the groups, regardless of ageing period. Hardness, absorption, and solubility values did differ between the ageing time points. The use of nanofillers and Opacifier did not affect the absorption and solubility properties of the silicone. However, the oil paint may have affected the polymerization of the silicone leading to initially lower hardness values.
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color stability of maxillofacial silicone with nanoparticle pigment and Opacifier submitted to disinfection and artificial aging
Journal of Biomedical Optics, 2011Co-Authors: Marcela Filié Haddad, Amália Moreno, Marcelo Coelho Goiato, Daniela Micheline Dos Santos, Nuno Filipe Dalmeida, Aldi??ris Alves PesqueiraAbstract:The purpose of this study was to evaluate the color stability of a maxillofacial elastomer with the addition of a nanoparticle pigment and/or an Opacifier submitted to chemical disinfection and artificial aging. Specimens were divided into four groups (n = 30): group I: silicone without pigment or Opacifier, group II: ceramic powder pigment, group III: Barium sulfate (BaSO4) Opacifier, and group IV: ceramic powder and BaSO4 Opacifier. Specimens of each group (n = 10) were disinfected with effervescent tablets, neutral soap, or 4% chlorhexidine gluconate. Disinfection was done three times a week during two months. Afterward, specimens were submitted to different periods of artificial aging. Color evaluation was initially done, after 60 days (disinfection period) and after 252, 504, and 1008 h of artificial aging with aid of a reflection spectrophotometer. Data were analyzed by three-way ANOVA and Tukey test (α = 0.05). The isolated factor disinfection did not statistically influence the values of color stability among groups. The association between pigment and BaSO4 Opacifier (GIV) was more stable in relationship to color change (△E). All values of △E obtained, independent of the disinfectant and the period of artificial aging, were considered acceptable in agreement with the norms presented in literature.
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influence of pigment and Opacifier on dimensional stability and detail reproduction of maxillofacial silicone elastomer
Journal of Craniofacial Surgery, 2011Co-Authors: Marcela Filié Haddad, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Daniela Micheline Dos Santos, Eduardo Piza PellizzerAbstract:Abstract We evaluated the influence of chemical disinfection and accelerated aging on the dimensional stability and detail reproduction of a silicone elastomer containing an Opacifier and/or a pigment. A total of 120 samples were fabricated from Silastic MDX 4-4210 silicone and divided into groups (n = 10) according to pigment and/or Opacifier (ceramic powder and/or barium sulfate) and disinfectant solution (neutral soap, Efferdent, or 4% chlorhexidine). The specimens were disinfected 3 times per week during 60 days and then subjected to accelerated aging for 1008 hours. Dimensional stability and detail reproduction tests were performed after specimens' fabrication (baseline) and chemical disinfection and periodically during accelerated aging (252, 504, and 1008 hours). The results were analyzed using 3-way repeated-measures analysis of variance and the Tukey Honestly Significant Difference test (a = 0.05). All groups exhibited dimensional changes over time. The disinfectant, pigment, and time (P < 0.0001) affected the dimensional stability of silicone. Statistically significant dimensional differences were not observed between the tested groups. Accelerated aging influenced the dimensional stability of the samples. All groups scored 2 in the detail reproduction tests, which represents the full reproduction of 3 test grooves with accurate angles. Incorporation of Opacifier and/or pigment alters the dimensional stability of silicones used in facial prosthetics but seems to have no influence on detail reproduction. Accelerated aging is responsible for most of the dimensional changes in Silastic MDX4 4210, but all dimensional changes measured in this study remained within the limits of stability necessary for this application.
Marcelo Coelho Goiato - One of the best experts on this subject based on the ideXlab platform.
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Effect of different methods of hygiene on the color stability of extrinsically pigmented facial silicone
Brazilian Journal of Oral Sciences, 2018Co-Authors: Yasmin Morais Cabral, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Marcela Filié HaddadAbstract:Evaluate the color stability of facial silicone pigmented extrinsically under the influence of the hygiene process. Methods: 160 samples were prepared and divided into 8 groups (n = 20) according to the pigmentation technique used: Group 1: Colorless silicone; Group 2: Pigmented exclusively with oil ink; Group 3: Pigmented with oil ink + Opacifier; Group 4: Colorless, applying Prime; Group 5: Pigmented with oil ink covered with Prime; Group 6: Pigmented with oil ink + Opacifier and covered with Prime; Group 7: Pigmented with oil ink diluted in Prime; Group 8: Pigmented with oil ink + Opacifier diluted in Prime. Then the samples were distributed into two subgropus (n=10): 1: neutral soap and 2: 1% hypochlorite solution. The color readings occurred in the initial period and 60 days after the hygiene procedures. For this, it was used a spectrophotometer reflection and CIE-Lab program. The data was tabulated and submitted to analysis of variance (ANOVA) followed by Tukey test (p
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Comparison of conventional and plant-extract disinfectant solutions on the hardness and color stability of a maxillofacial elastomer after artificial aging
Journal of Prosthetic Dentistry, 2016Co-Authors: Aimée Maria Guiotti, Aljomar José Vechiato-filho, Bruno Guandalini Cunha, Marcela Borghi Paulini, Amália Moreno, Daniela Micheline Dos Santos, Marcelo Coelho Goiato, Margarete Teresa Gottardo De AlmeidaAbstract:Statement of problem Silicone elastomers undergo physical and chemical degradation with disinfecting solutions. Phytotherapy may be a suitable solution for disinfection. However, its effect on the properties of the silicone material is unknown. Purpose The purpose of this in vitro study was to evaluate the effect of disinfection with conventional and plant-extract solutions and of artificial aging on the hardness and color stability of a facial silicone associated with pigments and an Opacifier. Material and methods Four hundred specimens of silicone (MDX4-4210) were fabricated (5×6 mm). Two pigment shades and 1 dry Opacifier were combined in the tested material, and 4 groups (n=10) were obtained: colorless (GI), colorless with Opacifier (GII), medium pigment with Opacifier (GIII), and black pigment with Opacifier (GIV). Specimens were subjected to disinfection (30 days) using saline solution, water, and neutral soap (digital friction, 30 seconds), chlorhexidine 4%, Hydrastis canadensis, and Cymbopogon nardus extracts (immersion, 10 minutes). Shore A hardness (ASTM D2240) and color analyses were performed before and after disinfection. Specimens were then exposed to 1008 hours of artificial aging (ASTM 53) and subjected to final hardness and color readings. The results were analyzed with ANOVA and the Tukey significant difference test (α=.05). Results The Opacifier increased the hardness (GII). For GII, the H. canadensis solution and the friction with water and soap promoted significantly reduced hardness; the friction also promoted a reduction in this property for GIV. The GIII was not affected after disinfection. A significant difference was found between the ΔE values of the specimens disinfected with H. canadensis, C. nardus, and chlorhexidine, and specimens subjected to saline solution and neutral soap. Conclusion The hardness of MDX4-4210 after the experimental procedure was considered clinically acceptable for facial prostheses. All groups showed clinically unacceptable color alterations regardless of the disinfecting solution.
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Effect of addition of pigments and Opacifier on the hardness, absorption, solubility and surface degradation of facial silicone after artificial ageing☆
Polymer Degradation and Stability, 2012Co-Authors: Daniela Micheline Dos Santos, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Stefan Fiuza De Carvalho Dekon, Aimée Maria GuiottiAbstract:The physical properties of silicone prostheses can be influenced by materials used for aesthetic detailing. The purpose of this study was to investigate the effect of two pigments and one Opacifier on hardness, absorption, and solubility of a facial silicone subjected to accelerated ageing. Silicone specimens were fabricated with or without pigments and Opacifier. 120 specimens were produced, with half being used for hardness testing and the other half for absorption and solubility tests. The specimens were divided into the following 6 groups (n = 20) according to whether they were made with nanofiller with pigments and Opacifier: colourless (I), colourless with Opacifier (IO), ceramic (C), Opacifier with ceramic (OC), oil (O), and oil with Opacifier (OO). The specimens were subjected to accelerated ageing for 1008 h. Hardness, absorption, and solubility were measured at baseline (B) and after 253 h (A1), 504 h (A2), and 1008 h (A3) of accelerated ageing. The data were analysed by 2-way repeated-measures analyses of variance (ANOVA) and Tukey's HSD test (α = 0.05). The lowest hardness values were obtained for the O and OO groups (ps
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effect of addition of pigments and Opacifier on the hardness absorption solubility and surface degradation of facial silicone after artificial ageing
Polymer Degradation and Stability, 2012Co-Authors: Daniela Micheline Dos Santos, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Stefan Fiuza De Carvalho Dekon, Aimée Maria GuiottiAbstract:The physical properties of silicone prostheses can be influenced by materials used for aesthetic detailing. The purpose of this study was to investigate the effect of two pigments and one Opacifier on hardness, absorption, and solubility of a facial silicone subjected to accelerated ageing. Silicone specimens were fabricated with or without pigments and Opacifier. 120 specimens were produced, with half being used for hardness testing and the other half for absorption and solubility tests. The specimens were divided into the following 6 groups (n = 20) according to whether they were made with nanofiller with pigments and Opacifier: colourless (I), colourless with Opacifier (IO), ceramic (C), Opacifier with ceramic (OC), oil (O), and oil with Opacifier (OO). The specimens were subjected to accelerated ageing for 1008 h. Hardness, absorption, and solubility were measured at baseline (B) and after 253 h (A1), 504 h (A2), and 1008 h (A3) of accelerated ageing. The data were analysed by 2-way repeated-measures analyses of variance (ANOVA) and Tukey's HSD test (α = 0.05). The lowest hardness values were obtained for the O and OO groups (ps < 0.05 vs. other groups). Absorption and solubility did not differ between the groups, regardless of ageing period. Hardness, absorption, and solubility values did differ between the ageing time points. The use of nanofillers and Opacifier did not affect the absorption and solubility properties of the silicone. However, the oil paint may have affected the polymerization of the silicone leading to initially lower hardness values.
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color stability of maxillofacial silicone with nanoparticle pigment and Opacifier submitted to disinfection and artificial aging
Journal of Biomedical Optics, 2011Co-Authors: Marcela Filié Haddad, Amália Moreno, Marcelo Coelho Goiato, Daniela Micheline Dos Santos, Nuno Filipe Dalmeida, Aldi??ris Alves PesqueiraAbstract:The purpose of this study was to evaluate the color stability of a maxillofacial elastomer with the addition of a nanoparticle pigment and/or an Opacifier submitted to chemical disinfection and artificial aging. Specimens were divided into four groups (n = 30): group I: silicone without pigment or Opacifier, group II: ceramic powder pigment, group III: Barium sulfate (BaSO4) Opacifier, and group IV: ceramic powder and BaSO4 Opacifier. Specimens of each group (n = 10) were disinfected with effervescent tablets, neutral soap, or 4% chlorhexidine gluconate. Disinfection was done three times a week during two months. Afterward, specimens were submitted to different periods of artificial aging. Color evaluation was initially done, after 60 days (disinfection period) and after 252, 504, and 1008 h of artificial aging with aid of a reflection spectrophotometer. Data were analyzed by three-way ANOVA and Tukey test (α = 0.05). The isolated factor disinfection did not statistically influence the values of color stability among groups. The association between pigment and BaSO4 Opacifier (GIV) was more stable in relationship to color change (△E). All values of △E obtained, independent of the disinfectant and the period of artificial aging, were considered acceptable in agreement with the norms presented in literature.
Daniela Micheline Dos Santos - One of the best experts on this subject based on the ideXlab platform.
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Effect of addition of pigments and Opacifier on the hardness, absorption, solubility and surface degradation of facial silicone after artificial ageing☆
Polymer Degradation and Stability, 2012Co-Authors: Daniela Micheline Dos Santos, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Stefan Fiuza De Carvalho Dekon, Aimée Maria GuiottiAbstract:The physical properties of silicone prostheses can be influenced by materials used for aesthetic detailing. The purpose of this study was to investigate the effect of two pigments and one Opacifier on hardness, absorption, and solubility of a facial silicone subjected to accelerated ageing. Silicone specimens were fabricated with or without pigments and Opacifier. 120 specimens were produced, with half being used for hardness testing and the other half for absorption and solubility tests. The specimens were divided into the following 6 groups (n = 20) according to whether they were made with nanofiller with pigments and Opacifier: colourless (I), colourless with Opacifier (IO), ceramic (C), Opacifier with ceramic (OC), oil (O), and oil with Opacifier (OO). The specimens were subjected to accelerated ageing for 1008 h. Hardness, absorption, and solubility were measured at baseline (B) and after 253 h (A1), 504 h (A2), and 1008 h (A3) of accelerated ageing. The data were analysed by 2-way repeated-measures analyses of variance (ANOVA) and Tukey's HSD test (α = 0.05). The lowest hardness values were obtained for the O and OO groups (ps
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effect of addition of pigments and Opacifier on the hardness absorption solubility and surface degradation of facial silicone after artificial ageing
Polymer Degradation and Stability, 2012Co-Authors: Daniela Micheline Dos Santos, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Stefan Fiuza De Carvalho Dekon, Aimée Maria GuiottiAbstract:The physical properties of silicone prostheses can be influenced by materials used for aesthetic detailing. The purpose of this study was to investigate the effect of two pigments and one Opacifier on hardness, absorption, and solubility of a facial silicone subjected to accelerated ageing. Silicone specimens were fabricated with or without pigments and Opacifier. 120 specimens were produced, with half being used for hardness testing and the other half for absorption and solubility tests. The specimens were divided into the following 6 groups (n = 20) according to whether they were made with nanofiller with pigments and Opacifier: colourless (I), colourless with Opacifier (IO), ceramic (C), Opacifier with ceramic (OC), oil (O), and oil with Opacifier (OO). The specimens were subjected to accelerated ageing for 1008 h. Hardness, absorption, and solubility were measured at baseline (B) and after 253 h (A1), 504 h (A2), and 1008 h (A3) of accelerated ageing. The data were analysed by 2-way repeated-measures analyses of variance (ANOVA) and Tukey's HSD test (α = 0.05). The lowest hardness values were obtained for the O and OO groups (ps < 0.05 vs. other groups). Absorption and solubility did not differ between the groups, regardless of ageing period. Hardness, absorption, and solubility values did differ between the ageing time points. The use of nanofillers and Opacifier did not affect the absorption and solubility properties of the silicone. However, the oil paint may have affected the polymerization of the silicone leading to initially lower hardness values.
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color stability of maxillofacial silicone with nanoparticle pigment and Opacifier submitted to disinfection and artificial aging
Journal of Biomedical Optics, 2011Co-Authors: Marcela Filié Haddad, Amália Moreno, Marcelo Coelho Goiato, Daniela Micheline Dos Santos, Nuno Filipe Dalmeida, Aldi??ris Alves PesqueiraAbstract:The purpose of this study was to evaluate the color stability of a maxillofacial elastomer with the addition of a nanoparticle pigment and/or an Opacifier submitted to chemical disinfection and artificial aging. Specimens were divided into four groups (n = 30): group I: silicone without pigment or Opacifier, group II: ceramic powder pigment, group III: Barium sulfate (BaSO4) Opacifier, and group IV: ceramic powder and BaSO4 Opacifier. Specimens of each group (n = 10) were disinfected with effervescent tablets, neutral soap, or 4% chlorhexidine gluconate. Disinfection was done three times a week during two months. Afterward, specimens were submitted to different periods of artificial aging. Color evaluation was initially done, after 60 days (disinfection period) and after 252, 504, and 1008 h of artificial aging with aid of a reflection spectrophotometer. Data were analyzed by three-way ANOVA and Tukey test (α = 0.05). The isolated factor disinfection did not statistically influence the values of color stability among groups. The association between pigment and BaSO4 Opacifier (GIV) was more stable in relationship to color change (△E). All values of △E obtained, independent of the disinfectant and the period of artificial aging, were considered acceptable in agreement with the norms presented in literature.
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influence of pigment and Opacifier on dimensional stability and detail reproduction of maxillofacial silicone elastomer
Journal of Craniofacial Surgery, 2011Co-Authors: Marcela Filié Haddad, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Daniela Micheline Dos Santos, Eduardo Piza PellizzerAbstract:Abstract We evaluated the influence of chemical disinfection and accelerated aging on the dimensional stability and detail reproduction of a silicone elastomer containing an Opacifier and/or a pigment. A total of 120 samples were fabricated from Silastic MDX 4-4210 silicone and divided into groups (n = 10) according to pigment and/or Opacifier (ceramic powder and/or barium sulfate) and disinfectant solution (neutral soap, Efferdent, or 4% chlorhexidine). The specimens were disinfected 3 times per week during 60 days and then subjected to accelerated aging for 1008 hours. Dimensional stability and detail reproduction tests were performed after specimens' fabrication (baseline) and chemical disinfection and periodically during accelerated aging (252, 504, and 1008 hours). The results were analyzed using 3-way repeated-measures analysis of variance and the Tukey Honestly Significant Difference test (a = 0.05). All groups exhibited dimensional changes over time. The disinfectant, pigment, and time (P < 0.0001) affected the dimensional stability of silicone. Statistically significant dimensional differences were not observed between the tested groups. Accelerated aging influenced the dimensional stability of the samples. All groups scored 2 in the detail reproduction tests, which represents the full reproduction of 3 test grooves with accurate angles. Incorporation of Opacifier and/or pigment alters the dimensional stability of silicones used in facial prosthetics but seems to have no influence on detail reproduction. Accelerated aging is responsible for most of the dimensional changes in Silastic MDX4 4210, but all dimensional changes measured in this study remained within the limits of stability necessary for this application.
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Influence of Opacifiers on dimensional stability and detail reproduction of maxillofacial silicone elastomer
Biomedical engineering online, 2010Co-Authors: Marcelo Coelho Goiato, Aldi??ris Alves Pesqueira, Daniela Micheline Dos Santos, Marcela Filié Haddad, Mário Alexandre Coelho Sinhoreti, Amália MorenoAbstract:Background We evaluated the influence of chemical disinfection and accelerated aging on the dimensional stability and detail reproduction of a silicone elastomer containing one of two Opacifiers.
Aimée Maria Guiotti - One of the best experts on this subject based on the ideXlab platform.
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Comparison of conventional and plant-extract disinfectant solutions on the hardness and color stability of a maxillofacial elastomer after artificial aging
Journal of Prosthetic Dentistry, 2016Co-Authors: Aimée Maria Guiotti, Aljomar José Vechiato-filho, Bruno Guandalini Cunha, Marcela Borghi Paulini, Amália Moreno, Daniela Micheline Dos Santos, Marcelo Coelho Goiato, Margarete Teresa Gottardo De AlmeidaAbstract:Statement of problem Silicone elastomers undergo physical and chemical degradation with disinfecting solutions. Phytotherapy may be a suitable solution for disinfection. However, its effect on the properties of the silicone material is unknown. Purpose The purpose of this in vitro study was to evaluate the effect of disinfection with conventional and plant-extract solutions and of artificial aging on the hardness and color stability of a facial silicone associated with pigments and an Opacifier. Material and methods Four hundred specimens of silicone (MDX4-4210) were fabricated (5×6 mm). Two pigment shades and 1 dry Opacifier were combined in the tested material, and 4 groups (n=10) were obtained: colorless (GI), colorless with Opacifier (GII), medium pigment with Opacifier (GIII), and black pigment with Opacifier (GIV). Specimens were subjected to disinfection (30 days) using saline solution, water, and neutral soap (digital friction, 30 seconds), chlorhexidine 4%, Hydrastis canadensis, and Cymbopogon nardus extracts (immersion, 10 minutes). Shore A hardness (ASTM D2240) and color analyses were performed before and after disinfection. Specimens were then exposed to 1008 hours of artificial aging (ASTM 53) and subjected to final hardness and color readings. The results were analyzed with ANOVA and the Tukey significant difference test (α=.05). Results The Opacifier increased the hardness (GII). For GII, the H. canadensis solution and the friction with water and soap promoted significantly reduced hardness; the friction also promoted a reduction in this property for GIV. The GIII was not affected after disinfection. A significant difference was found between the ΔE values of the specimens disinfected with H. canadensis, C. nardus, and chlorhexidine, and specimens subjected to saline solution and neutral soap. Conclusion The hardness of MDX4-4210 after the experimental procedure was considered clinically acceptable for facial prostheses. All groups showed clinically unacceptable color alterations regardless of the disinfecting solution.
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Effect of addition of pigments and Opacifier on the hardness, absorption, solubility and surface degradation of facial silicone after artificial ageing☆
Polymer Degradation and Stability, 2012Co-Authors: Daniela Micheline Dos Santos, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Stefan Fiuza De Carvalho Dekon, Aimée Maria GuiottiAbstract:The physical properties of silicone prostheses can be influenced by materials used for aesthetic detailing. The purpose of this study was to investigate the effect of two pigments and one Opacifier on hardness, absorption, and solubility of a facial silicone subjected to accelerated ageing. Silicone specimens were fabricated with or without pigments and Opacifier. 120 specimens were produced, with half being used for hardness testing and the other half for absorption and solubility tests. The specimens were divided into the following 6 groups (n = 20) according to whether they were made with nanofiller with pigments and Opacifier: colourless (I), colourless with Opacifier (IO), ceramic (C), Opacifier with ceramic (OC), oil (O), and oil with Opacifier (OO). The specimens were subjected to accelerated ageing for 1008 h. Hardness, absorption, and solubility were measured at baseline (B) and after 253 h (A1), 504 h (A2), and 1008 h (A3) of accelerated ageing. The data were analysed by 2-way repeated-measures analyses of variance (ANOVA) and Tukey's HSD test (α = 0.05). The lowest hardness values were obtained for the O and OO groups (ps
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effect of addition of pigments and Opacifier on the hardness absorption solubility and surface degradation of facial silicone after artificial ageing
Polymer Degradation and Stability, 2012Co-Authors: Daniela Micheline Dos Santos, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Stefan Fiuza De Carvalho Dekon, Aimée Maria GuiottiAbstract:The physical properties of silicone prostheses can be influenced by materials used for aesthetic detailing. The purpose of this study was to investigate the effect of two pigments and one Opacifier on hardness, absorption, and solubility of a facial silicone subjected to accelerated ageing. Silicone specimens were fabricated with or without pigments and Opacifier. 120 specimens were produced, with half being used for hardness testing and the other half for absorption and solubility tests. The specimens were divided into the following 6 groups (n = 20) according to whether they were made with nanofiller with pigments and Opacifier: colourless (I), colourless with Opacifier (IO), ceramic (C), Opacifier with ceramic (OC), oil (O), and oil with Opacifier (OO). The specimens were subjected to accelerated ageing for 1008 h. Hardness, absorption, and solubility were measured at baseline (B) and after 253 h (A1), 504 h (A2), and 1008 h (A3) of accelerated ageing. The data were analysed by 2-way repeated-measures analyses of variance (ANOVA) and Tukey's HSD test (α = 0.05). The lowest hardness values were obtained for the O and OO groups (ps < 0.05 vs. other groups). Absorption and solubility did not differ between the groups, regardless of ageing period. Hardness, absorption, and solubility values did differ between the ageing time points. The use of nanofillers and Opacifier did not affect the absorption and solubility properties of the silicone. However, the oil paint may have affected the polymerization of the silicone leading to initially lower hardness values.
Amália Moreno - One of the best experts on this subject based on the ideXlab platform.
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Effect of different methods of hygiene on the color stability of extrinsically pigmented facial silicone
Brazilian Journal of Oral Sciences, 2018Co-Authors: Yasmin Morais Cabral, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Marcela Filié HaddadAbstract:Evaluate the color stability of facial silicone pigmented extrinsically under the influence of the hygiene process. Methods: 160 samples were prepared and divided into 8 groups (n = 20) according to the pigmentation technique used: Group 1: Colorless silicone; Group 2: Pigmented exclusively with oil ink; Group 3: Pigmented with oil ink + Opacifier; Group 4: Colorless, applying Prime; Group 5: Pigmented with oil ink covered with Prime; Group 6: Pigmented with oil ink + Opacifier and covered with Prime; Group 7: Pigmented with oil ink diluted in Prime; Group 8: Pigmented with oil ink + Opacifier diluted in Prime. Then the samples were distributed into two subgropus (n=10): 1: neutral soap and 2: 1% hypochlorite solution. The color readings occurred in the initial period and 60 days after the hygiene procedures. For this, it was used a spectrophotometer reflection and CIE-Lab program. The data was tabulated and submitted to analysis of variance (ANOVA) followed by Tukey test (p
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Comparison of conventional and plant-extract disinfectant solutions on the hardness and color stability of a maxillofacial elastomer after artificial aging
Journal of Prosthetic Dentistry, 2016Co-Authors: Aimée Maria Guiotti, Aljomar José Vechiato-filho, Bruno Guandalini Cunha, Marcela Borghi Paulini, Amália Moreno, Daniela Micheline Dos Santos, Marcelo Coelho Goiato, Margarete Teresa Gottardo De AlmeidaAbstract:Statement of problem Silicone elastomers undergo physical and chemical degradation with disinfecting solutions. Phytotherapy may be a suitable solution for disinfection. However, its effect on the properties of the silicone material is unknown. Purpose The purpose of this in vitro study was to evaluate the effect of disinfection with conventional and plant-extract solutions and of artificial aging on the hardness and color stability of a facial silicone associated with pigments and an Opacifier. Material and methods Four hundred specimens of silicone (MDX4-4210) were fabricated (5×6 mm). Two pigment shades and 1 dry Opacifier were combined in the tested material, and 4 groups (n=10) were obtained: colorless (GI), colorless with Opacifier (GII), medium pigment with Opacifier (GIII), and black pigment with Opacifier (GIV). Specimens were subjected to disinfection (30 days) using saline solution, water, and neutral soap (digital friction, 30 seconds), chlorhexidine 4%, Hydrastis canadensis, and Cymbopogon nardus extracts (immersion, 10 minutes). Shore A hardness (ASTM D2240) and color analyses were performed before and after disinfection. Specimens were then exposed to 1008 hours of artificial aging (ASTM 53) and subjected to final hardness and color readings. The results were analyzed with ANOVA and the Tukey significant difference test (α=.05). Results The Opacifier increased the hardness (GII). For GII, the H. canadensis solution and the friction with water and soap promoted significantly reduced hardness; the friction also promoted a reduction in this property for GIV. The GIII was not affected after disinfection. A significant difference was found between the ΔE values of the specimens disinfected with H. canadensis, C. nardus, and chlorhexidine, and specimens subjected to saline solution and neutral soap. Conclusion The hardness of MDX4-4210 after the experimental procedure was considered clinically acceptable for facial prostheses. All groups showed clinically unacceptable color alterations regardless of the disinfecting solution.
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Effect of addition of pigments and Opacifier on the hardness, absorption, solubility and surface degradation of facial silicone after artificial ageing☆
Polymer Degradation and Stability, 2012Co-Authors: Daniela Micheline Dos Santos, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Stefan Fiuza De Carvalho Dekon, Aimée Maria GuiottiAbstract:The physical properties of silicone prostheses can be influenced by materials used for aesthetic detailing. The purpose of this study was to investigate the effect of two pigments and one Opacifier on hardness, absorption, and solubility of a facial silicone subjected to accelerated ageing. Silicone specimens were fabricated with or without pigments and Opacifier. 120 specimens were produced, with half being used for hardness testing and the other half for absorption and solubility tests. The specimens were divided into the following 6 groups (n = 20) according to whether they were made with nanofiller with pigments and Opacifier: colourless (I), colourless with Opacifier (IO), ceramic (C), Opacifier with ceramic (OC), oil (O), and oil with Opacifier (OO). The specimens were subjected to accelerated ageing for 1008 h. Hardness, absorption, and solubility were measured at baseline (B) and after 253 h (A1), 504 h (A2), and 1008 h (A3) of accelerated ageing. The data were analysed by 2-way repeated-measures analyses of variance (ANOVA) and Tukey's HSD test (α = 0.05). The lowest hardness values were obtained for the O and OO groups (ps
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effect of addition of pigments and Opacifier on the hardness absorption solubility and surface degradation of facial silicone after artificial ageing
Polymer Degradation and Stability, 2012Co-Authors: Daniela Micheline Dos Santos, Aldi??ris Alves Pesqueira, Amália Moreno, Marcelo Coelho Goiato, Stefan Fiuza De Carvalho Dekon, Aimée Maria GuiottiAbstract:The physical properties of silicone prostheses can be influenced by materials used for aesthetic detailing. The purpose of this study was to investigate the effect of two pigments and one Opacifier on hardness, absorption, and solubility of a facial silicone subjected to accelerated ageing. Silicone specimens were fabricated with or without pigments and Opacifier. 120 specimens were produced, with half being used for hardness testing and the other half for absorption and solubility tests. The specimens were divided into the following 6 groups (n = 20) according to whether they were made with nanofiller with pigments and Opacifier: colourless (I), colourless with Opacifier (IO), ceramic (C), Opacifier with ceramic (OC), oil (O), and oil with Opacifier (OO). The specimens were subjected to accelerated ageing for 1008 h. Hardness, absorption, and solubility were measured at baseline (B) and after 253 h (A1), 504 h (A2), and 1008 h (A3) of accelerated ageing. The data were analysed by 2-way repeated-measures analyses of variance (ANOVA) and Tukey's HSD test (α = 0.05). The lowest hardness values were obtained for the O and OO groups (ps < 0.05 vs. other groups). Absorption and solubility did not differ between the groups, regardless of ageing period. Hardness, absorption, and solubility values did differ between the ageing time points. The use of nanofillers and Opacifier did not affect the absorption and solubility properties of the silicone. However, the oil paint may have affected the polymerization of the silicone leading to initially lower hardness values.
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color stability of maxillofacial silicone with nanoparticle pigment and Opacifier submitted to disinfection and artificial aging
Journal of Biomedical Optics, 2011Co-Authors: Marcela Filié Haddad, Amália Moreno, Marcelo Coelho Goiato, Daniela Micheline Dos Santos, Nuno Filipe Dalmeida, Aldi??ris Alves PesqueiraAbstract:The purpose of this study was to evaluate the color stability of a maxillofacial elastomer with the addition of a nanoparticle pigment and/or an Opacifier submitted to chemical disinfection and artificial aging. Specimens were divided into four groups (n = 30): group I: silicone without pigment or Opacifier, group II: ceramic powder pigment, group III: Barium sulfate (BaSO4) Opacifier, and group IV: ceramic powder and BaSO4 Opacifier. Specimens of each group (n = 10) were disinfected with effervescent tablets, neutral soap, or 4% chlorhexidine gluconate. Disinfection was done three times a week during two months. Afterward, specimens were submitted to different periods of artificial aging. Color evaluation was initially done, after 60 days (disinfection period) and after 252, 504, and 1008 h of artificial aging with aid of a reflection spectrophotometer. Data were analyzed by three-way ANOVA and Tukey test (α = 0.05). The isolated factor disinfection did not statistically influence the values of color stability among groups. The association between pigment and BaSO4 Opacifier (GIV) was more stable in relationship to color change (△E). All values of △E obtained, independent of the disinfectant and the period of artificial aging, were considered acceptable in agreement with the norms presented in literature.
