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

Nóbrega, Adhara Smith; Neto, Clóvis Lamartinede Moraes Melo; Santos, Daniela Micheline dos; Bertoz, André Pinheirode Magalhães; MeloMoreno, André Luiz de; Goiato, Marcelo Coelho

doi:10.1055/s-0041-1731932

Cited by 3 publications

(13 citation statements)

References 15 publications

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“…The National Bureau of Standards (NBS) introduced a sophisticated assessment of color appearance differences by NBSranging units. 18,20,27 in the range of 6.0 to 12.0 represent marked changes. The values of ΔE diff beyond 12.0 indicate very much changed to other colors.…”

Section: Discussionmentioning

confidence: 99%

“…The National Bureau of Standards (NBS) introduced a sophisticated assessment of color appearance differences by NBS-ranging units. 18 20 27 . The values of ∆ E diff between 0 and 1.5 represent extremely slight changes but imperceivable.…”

Section: Discussionmentioning

confidence: 99%

“…[20][21][22] The accelerated thermocycle aging technique has been introduced to predict the clinically perceptible color change of material for long-term clinical experience. [20][21][22]27 The accelerated thermocycle aging provokes stress to the material and rushes up the deterioration effect on color change. 28 Previous studies suggested that some PMMA resins lean to undergo less discoloration over time than bis-acryl resins.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, some studies have detected similarities in the color alteration of various provisional materials. 20 27 29 Vis-a-vis , a study described that provisional resin composite was not as color stable as provisional resin acrylic upon the simulated aging situation. 27 This suggests that the prediction of color stability of restorative material is still controversial regarding which provisional material performs superior color stability.…”

Section: Introductionmentioning

confidence: 99%

“…20 27 29 Vis-a-vis , a study described that provisional resin composite was not as color stable as provisional resin acrylic upon the simulated aging situation. 27 This suggests that the prediction of color stability of restorative material is still controversial regarding which provisional material performs superior color stability. Moreover, the investigation into the impact of aging on the color appearance of the CAD-CAM-formed and traditional-formed temporary restoration is absent.…”

Section: Introductionmentioning

confidence: 99%

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Color Appearance of Various Provisional Restorative Materials for Rehabilitation Upon Aging

Juntavee

Srisontisuk

2023

Eur J Dent

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Objectives Color stability of provisional restoration is crucial for full mouth reconstruction, which is probably influenced by aging. Therefore, this study evaluated the effect of aging on the color appearance of different provisional materials. Materials and Methods Rectangular specimens (10 × 10 × 2 mm) were fabricated from computer-aided design-computer-aided manufacturing (CAD-CAM) (Vita CAD-Temp [VC], TelioCAD [TC], artBloc [RC]), autopolymerized (ProtempIV [PA], Luxatemp [LA], UnifastTrad [UA]), and heat-polymerized polymer (Major C&B [MH]). Each was divided into aging (AG, 5,000 thermocycles of 5°/55°C) and non-aging group (n = 21/group). Color parameters were determined using a spectrophotometer through the CIELAB system. The L*, a*, and b* data were calculated for color appearance (∆E), translucency parameter (TP), contrast ratio (CR), and opalescence parameter (OP) for each. Statistical Analysis An analysis of variance and multiple comparisons were determined for a significant difference in color appearance alteration of materials upon aging (α = 0.05). Results Statistically significant differences of L*, a*, b*, ∆E, TP, CR, and OP due to the effect of types of material (p < 0.05), aging effect (p < 0.05), and their interactions (p < 0.05) were indicated. Aging affects the color appearance, lightness, chromaticity, translucency, contrast, and opalescence of various types of provisional materials. Color appearance alteration of provisional materials was significantly indicated upon aging (p < 0.05) but within the perceivable limit of clinical acceptance (∆E diff < 3.0), except for PA and MH. Color stability of CAD-CAM-based poly-methyl methacrylate (PMMA) and autopolymerized PMMA upon aging were better than bis-acryl resin and heat-polymerized PMMA. The TP, CR, and OP alterations of tested materials upon aging were within the perceivable limit. Conclusion Color appearance of provisional restorative materials was influenced by aging. The CAD-CAM-based PMMA and autopolymerized PMMA materials showed better color stability than bis-acryl provisional resin and heat-polymerized PMMA upon aging. Therefore, they were suggested as provisional materials for oral rehabilitation.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Color Appearance of Various Provisional Restorative Materials for Rehabilitation Upon Aging

Juntavee

Srisontisuk

2023

Eur J Dent

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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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Evaluation of the Mechanical and Physical Properties of Maxillofacial Silicone Type A-2186 Impregnated with a Hybrid Chitosan–TiO2 Nanocomposite Subjected to Different Accelerated Aging Conditions

Al-Kadi,

Adbulkareem,

Azhdar

2023

Biomimetics

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The effects of incorporating a pioneer chitosan–TiO2 nanocomposite on the mechanical and physical properties of room-temperature vulcanization (RTV) maxillofacial A-2186 silicone under accelerated aging protocols were rigorously examined. This investigation utilized 450 samples distributed across five distinct silicone classifications and assessed their attributes, such as tensile strength, elongation, tear strength, hardness, and surface roughness, before and after various accelerated aging processes. Statistical methodologies, including a one-way ANOVA, Tukey’s HSD, and Dunnett’s T3, were employed based on the homogeneity of variance, and several key results were obtained. Silicones infused with 1 wt.% chitosan–TiO2 showed enhanced tensile strength across various aging procedures. Moreover, the 1 wt.% TiO2/Chitosan noncombination (TC) and 2 wt.% TiO2 compositions exhibited pronounced improvements in the elongation percentage. A consistent rise was evident across all silicone categories regarding tear strength, with the 1 wt.% chitosan–TiO2 variant being prominent under certain conditions. Variations in hardness were observed, with the 1 wt.% TC and 3 wt.% chitosan samples showing distinctive responses to certain conditions. Although most samples displayed a decreased surface roughness upon aging, the 1 wt.% chitosan–TiO2 variant frequently countered this trend. This investigation provides insights into the potential of the chitosan–TiO2 nanocomposite to influence silicone properties under aging conditions.

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

Cited by 3 publications

References 15 publications

Color Appearance of Various Provisional Restorative Materials for Rehabilitation Upon Aging

Color Appearance of Various Provisional Restorative Materials for Rehabilitation Upon Aging

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

Evaluation of the Mechanical and Physical Properties of Maxillofacial Silicone Type A-2186 Impregnated with a Hybrid Chitosan–TiO2 Nanocomposite Subjected to Different Accelerated Aging Conditions

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