Influence of Different Pigmentations and Accelerated Aging on the Hardness and Tear Strength of the A-2186 and MDX4-4210 Silicones

Malavazi, Estefânia Marrega; Santos, Daniela Micheline dos; Neto, Clóvis Lamartine de Moraes Melo; Caxias, Fernanda Pereira de; Silva, Emily Vivianne Freitas da; Bannwart, Lisiane Cristina; Bitencourt, Sandro Basso; Moreno, André Luiz de Melo; Bertoz, André Pinheiro de Magalhães; Goiato, Marcelo Coelho

doi:10.1155/2020/8492091

Cited by 3 publications

(14 citation statements)

References 21 publications

(191 reference statements)

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“…The silicones and intrinsic pigments were weighed on a digital analytical balance (Adventurer, Ohaus Corporation, United States). 2 3 4 5 6 7 8 The bronze pigment corresponded to 0.2% of the weight of each silicone. 2 3 4 5 6 7 8 The black pigment also corresponded to 0.2% of the weight of each silicone.…”

Section: Methodsmentioning

confidence: 99%

“… 2 3 4 5 6 7 8 The bronze pigment corresponded to 0.2% of the weight of each silicone. 2 3 4 5 6 7 8 The black pigment also corresponded to 0.2% of the weight of each silicone. 2 3 4 5 6 7 8 For the pink pigment, the pigments that constituted it corresponded to 0.122% (yellow), 0.006% (black), 0.03% (red), and 0.6% TiO 2 (opacifier) of the weight of each silicone.…”

Section: Methodsmentioning

confidence: 99%

“…Facial prostheses may be used to rehabilitate patients with orofacial defects because they help to restore the patient’s self-esteem, quality of life, esthetics, and social life. 2 3 4 5 6 7 8 Silicone elastomer is the most used option to manufacture maxillofacial prostheses. 2 3 4 5 6 7 The advantage of this type of material is its ability to imitate human skin tissue both aesthetically and functionally.…”

Section: Introductionmentioning

confidence: 99%

“… 2 3 4 5 6 7 8 Silicone elastomer is the most used option to manufacture maxillofacial prostheses. 2 3 4 5 6 7 The advantage of this type of material is its ability to imitate human skin tissue both aesthetically and functionally. 1 4 The MDX4-4210 and A-2186 silicones are examples of two widely used silicones.…”

Section: Introductionmentioning

confidence: 99%

“…The degradation of the physical and mechanical properties of a silicone prosthesis is related to its exposure to ultraviolet rays, polluted air, and humidity, as well as its inadequate cleaning and daily handling. 2 5 6 9 The literature reports that the replacement of a silicone prosthesis occurs from 3 to 12 months after its manufacture due to its degradation. 2 3 6 …”

Section: Introductionmentioning

confidence: 99%

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Effect of Accelerated Aging on the Sorption and Solubility Percentages of Silicone Facial Prostheses

et al. 2021

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Objective This study aimed to evaluate the effect of accelerated aging on the sorption and solubility percentages of the MDX4-4210 and A-2186 silicones. Materials and Methods Two silicones (A-2186 and MDX4-4210) and three intrinsic pigments (bronze, black, and pink) were used in this study. Thus, six groups were created (n = 10): Group 1 = bronze MDX4-4210; Group 2 = black MDX4-4210; Group 3 = pink MDX4-4210; Group 4 = bronze A-2186; Group 5 = black A-2186; and Group 6 = pink A-2186. The dimensions of all samples were the same (45-mm diameter (ø) × 1-mm thickness). The samples were aged for a total of 1,008 hours. In this period of 1,008 hours of accelerated aging, the sorption and solubility percentages of each sample were calculated at three time points (252, 504, and 1,008 hours). Statistical Analysis Three-way analysis of variance (ANOVA) and the Tukey test were performed (α = 0.05). Result Accelerated aging can significantly increase the sorption and solubility percentages of the MDX4-4210 and A-2186 silicones.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Accelerated Aging on the Sorption and Solubility Percentages of Silicone Facial Prostheses

et al. 2021

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Influence of Different Pigment Incorporation Methods on the Sorption and Solubility of Medical Silicones

et al. 2020

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Objective The aim of this study is to verify the influence of three pigment incorporation methods (conventional, mechanical, and industrial) on the sorption and solubility of the MDX4-4210 and A-2186 silicones. Materials and Methods The groups formed were based on the silicones used (A-2186 and MDX4-4210), intrinsic pigments (pink, bronze, and black), and pigment incorporation methods (conventional, mechanical, and industrial). The dimensions of all samples were 45-mm diameter (ø) × 1-mm thickness. Readings were taken initially and after 1,008 hours of aging. Statistical Analysis Three-way analysis of variance and the Tukey’s test were performed (α = 0.05). Results For sorption and solubility, there was no difference between the incorporation methods for the A-2186 silicone, regardless of the pigment used (p > 0.05). For pink MDX4-4210, the industrial and mechanical methods showed higher values of sorption compared with the conventional method (p < 0.05). For bronze MDX4-4210, the industrial method showed a higher sorption value compared with the conventional and mechanical methods (p < 0.05). For black MDX4-4210, there was no difference between incorporation methods based on sorption (p > 0.05). For pink MDX4-4210, the mechanical method showed a higher solubility value compared with the industrial and conventional methods (p < 0.05). For black MDX4-4210 and bronze MDX4-4210, there was no statistically significant difference between incorporation methods based on solubility (p > 0.05). Conclusion Based on sorption and solubility, for the A-2186 silicone, the conventional, mechanical, and industrial methods of pigment incorporation were equivalent. For the MDX4-4210 silicone, its results of sorption and solubility were varied, and further studies are recommended.

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Effect of Extrinsic Pigmentation on Dimensional Stability, Hardness, Detail Reproduction, and Color of a Silicone

et al. 2022

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Objective The aim of the study is to evaluate the effect of extrinsic pigmentation on the dimensional stability, hardness, detail reproduction, and color of a silicone after thermocycling. Materials and Methods Sixty samples of MDX4–4210 silicone (Dow Corning Corporation Medical Products) with intrinsic pink pigment (H-109-P, Factor II) and intrinsic opacifier (TiO) were fabricated. Two groups were created: Group 1—only intrinsic pigmentation (H-109P, Factor II + TiO) (Control); and Group 2—intrinsic (H-109P, Factor II + TiO) and extrinsic (Tan FE - 215, Factor II) pigmentation. The following tests were performed for each group: dimensional stability, Shore A hardness, detail reproduction, and color. Readings for the tests were taken before and after thermocycling (2,000 cycles). For dimensional stability and hardness, two-way analysis of variance (ANOVA) was used. One-way ANOVA was used for the color test. In case of significant statistical difference, the Tukey test was applied (p <0.05). All samples achieved the same detail reproduction score, therefore, no statistical evaluation was performed. Results For the dimensional stability test, comparing the initial time with the final time, there was a significant contraction in both groups after thermocycling. For the hardness test, comparing the time points, only group 1 showed a significant reduction in hardness after thermocycling. Groups 1 and 2 scored 2 for the detail reproduction test, before and after thermocycling. Comparing group 1 with group 2, there was no significant difference for color change. Conclusion Based on the tests performed, extrinsic pigmentation did not show a negative effect on silicone, and therefore it can be indicated. The results of the dimensional, hardness, detail reproduction and color evaluations of the MDX4–4210 silicone were clinically acceptable in all cases in the groups with and without extrinsic pigmentation.

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Influence of Different Pigmentations and Accelerated Aging on the Hardness and Tear Strength of the A-2186 and MDX4-4210 Silicones

Cited by 3 publications

References 21 publications

Effect of Accelerated Aging on the Sorption and Solubility Percentages of Silicone Facial Prostheses

Effect of Accelerated Aging on the Sorption and Solubility Percentages of Silicone Facial Prostheses

Influence of Different Pigment Incorporation Methods on the Sorption and Solubility of Medical Silicones

Effect of Extrinsic Pigmentation on Dimensional Stability, Hardness, Detail Reproduction, and Color of a Silicone

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