Evaluation of the effect of ultraviolet stabilizers on the change in color of pigmented silicone elastomer: An in vitro study

Kheur, Mohit; Sethi, Tania; Coward, Trevor; Kakade, Dilip; Rajkumar, M.

doi:10.4103/0972-4052.176535

Cited by 10 publications

(5 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A stainless steel mould was prepared for the fabrication of samples as described in a previous study by Kheur et al . [ 27 ] Pigmented silicone samples rectangular in shape, of dimensions 1.5 cm × 2 cm × 0.5 cm were fabricated.…”

Section: Methodsmentioning

confidence: 99%

“…The authors of this current study have previously analyzed the effect of UV stabilizers on the color change of pigmented silicone elastomer and observed that the addition of UV stabilizers leads to increased color stability for red and yellow pigments. [ 27 ] However, the authors noted that pigments play a vital role in degradation and color instability in elastomers and, therefore, there is a need for the development of newer pigments which would improve the color stability of the elastomers.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of newly developed pigments and ultraviolet absorbers on the color change of pigmented silicone elastomer

Kheur

Kakade

Trevor

et al. 2017

J Indian Prosthodont Soc

Self Cite

View full text Add to dashboard Cite

Aim and Objective:The aim and objective of the study is to evaluate effect of ultraviolet (UV) stabilizer (UV absorber Chimassorb 81) on color change of pigmented silicone elastomer when commercially available (red and yellow), and newly developed pigments (sicotrans red and sicopal brown) were used.Materials and Methods:Two commercially available pigments – red (P112 Brilliant Red) and yellow (P106 Yellow) and two newly developed pigments – sicotrans red and sicopal brown were studied. In total eight groups made up of nine samples each were fabricated using elastomer with the combinations of the above pigments and UV stabilizer (Chimassorb 81). Groups 1, 3, 5, and 7 contain elastomer in combination with sicotrans red, sicopal brown, yellow and red pigments, respectively. Similarly, groups 2, 4, 6, and 8 along with elastomer and pigments (sicotrans sed, sicopal brown, yellow and red, respectively) contain the UV stabilizer (Chimassorb 81). Samples were subjected to aging in an accelerated weathering chamber (Weather-Ometer). Color values CIE (Commission Internationale d’Eclairage) L*, a*, and b * were measured at baseline and after 1000 h of weathering. Change in color (Delta E) was calculated.Results:All groups showed a significant color change at 1000 h. Groups 1, 2, 3, and 4 showed a statistically significant less change in both colors (sico trans red and sicopal brown) compared to groups 5,6,7, and 8 (commercial pigments-Red and Yellow). Overall, the change in the color in groups with the UV stabilizer (Chimassorb) was less when compared to the groups where the stabilizer was not used.Conclusion:The newly developed pigment led to increased color stability as compared to commercially available pigments. Addition of UV stabilizer, Chimassorb led to a further reduction in color change of the pigmented elastomer.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of newly developed pigments and ultraviolet absorbers on the color change of pigmented silicone elastomer

Kheur

Kakade

Trevor

et al. 2017

J Indian Prosthodont Soc

Self Cite

View full text Add to dashboard Cite

show abstract

“…According to the ISO, standard tear strength of silicone material used in current study must be 18-53 N/ mm and tensile strength 2.0-7 N/mm 2 . 10 16 Therefore, ∆E values less than equal to 3 can be considered as acceptable for evaluating color stability.…”

Section: Color Stabilitymentioning

confidence: 99%

To Evaluate and Compare the Effect of Indoor and Outdoor Weathering on Mechanical Properties and Color Stability of High Temperature Vulcanized Maxillofacial Elastomer Material: An In Vitro Study

Pathak,

Pawah,

Garg

et al. 2023

Dental Journal of Advance Studies

View full text Add to dashboard Cite

Background: Research in the dental material field is progressing to find the perfect material for maxillofacial prosthetics. This material must meet certain criteria such as functionality, biocompatibility, esthetics, and durability. Silicone is currently the most commonly used material, but it still has weaknesses that need to be addressed. This article explores how environmental factors, such as sunlight, rain, wind and cleaning, can affect auricular prostheses. The article also examines the areas where current materials fall short and need improvement to provide individuals with the best maxillofacial prostheses possible. Aim: The purpose of this in vitro study was to evaluate and compare the effect of indoor and outdoor weathering on mechanical properties and color stability of high temperature vulcanized silicone (HTV) maxillofacial elastomer material. Objective: To evaluate and compare tear strength, tensile strength, hardness and color stability of HTV silicone before and after 6 months of indoor condition and outdoor weathering. Materials and methods: In order to achieve the objective, mechanical properties of maxillofacial silicone material Technovent Z004 Platinum Silicone Rubber was investigated before and after natural outdoor weathering in comparison to indoor weathering. A total of 40 maxillofacial silicone samples were prepared in two different shapes and sizes using a standardized stainless steel die. The samples were divided into two groups, indoor and outdoor weathering of 20 samples each. Before weathering the samples were tested at baseline for hardness and color stability. About 20 samples were placed in a dry dark closed box and the other half samples were placed outdoor on a rooftop for 6 months. After 6 months, final testing for all the parameters was done using Universal Testing Machine, Shore A durometer and spectrophotometer. The mean values of all the readings of all the samples were statistically analyzed. Result:The results obtained from this in vitro study conclusively showed that over time the tear strength, tensile strength, hardness and color stability (∆E) degraded more in outdoor samples (tear strength = 16.93 N/mm, tensile strength = 2.77 N/mm 2 , Hardness = 39.50, ∆E = 1.81) as compared to indoor samples (tear strength = 20.22 N/mm, tensile strength = 3.61 N/mm 2 , Hardness = 37.25, ∆E = 0.72). This showed that apart from aging, exposure to sunlight degrades the silicone even more and it needs to repeat a new prosthesis after every 6 months. Conclusion: Silicone elastomers are thus materials that have ideal physical properties suitable for making prosthesis to replace lost facial structures. Though, esthetic quality still requires future studies, particularly long-term prospective clinical trials to determine the amount of distortion tolerable biologically and mechanically.

show abstract

“…These studies have focused on the effect of the incorporation of nano-oxides, ultraviolet light absorbers and opacifiers on the colour stability and mechanical properties of silicone elastomers [20–27]. Chu and Fisher [28] reported that adding 1.5% UV absorbers by weight provided adequate UV protection, which is supported by other studies [21, 24, 29]. However, colour stability remains a major problem for maxillofacial patients.…”

Section: Introductionmentioning

confidence: 98%

Effect of vulcanization temperature and dental stone colour on colour degradation of maxillofacial silicone elastomers

Çifter¹,

Karataş²,

Baca³

et al. 2017

BMC Oral Health

View full text Add to dashboard Cite

BackgroundColour degradation is a major problem in maxillofacial silicone elastomers. Recent studies have focused on colour stability and the mechanical properties of the silicone elastomers. A colour match is also essential for the acceptance of the prosthesis by the patient. The aim of this study is to assess the colour degradation of the silicone elastomer after being moulded in different colours of dental stones at two different vulcanization temperatures.MethodsFive different colours of dental stones were used to fabricate a total of 120 silicone blocks using a Cosmesil M511 maxillofacial silicone elastomer. Vulcanization was completed at two different temperatures (25 and 100° Celsius). Colour measurements were obtained with a Conica Minolta spectrophotometer. The CIEDE2000 formula was used to calculate the colour differences (∆E00). Two-way ANOVA, one-way ANOVA with Bonferroni corrected post-hoc p values and independent samples t-test were used for the statistical analyses.ResultsHigh temperature vulcanization causes lightening of the maxillofacial silicone elastomers without regard to the dental stone colour (p = 0.001). Specimens moulded in green stone lightened least at room temperature (p = 0.999). Compared to the control group, at high temperature, all specimens moulded in coloured dental stones darkened significantly (p < 0.001 for white, blue and yellow; p = 0.006 for green; p = 0.045 for reddish-brown). In the high temperature group, the shift to a green chroma was significant in the white, yellow and green dental stones groups (p = 0.001, p = 0.002, p < 0.001, respectively). The mean b* of the high temperature control group was higher than that of the room temperature control group (p < 0.001). The only ∆E00 score lower than the perceptibility threshold for dental materials (∆E00 = 1.30) was between the room temperature control group and the room temperature green dental stone group (∆E00 = 0.96).ConclusionsGreen and blue dental stones cause less colour degradation in silicone elastomers. Reddish-brown dental stones cause the most colour degradation in silicone elastomers. At 100 °C, the colour of the silicone elastomer lightens and yellows even if the elastomer is vulcanized in a stainless steel mould. White, yellow and reddish-brown dental stones make the silicone elastomer appear more yellow even if the elastomer is vulcanized at room temperature.

show abstract

Evaluation of the effect of ultraviolet stabilizers on the change in color of pigmented silicone elastomer: An in vitro study

Cited by 10 publications

References 26 publications

Effect of newly developed pigments and ultraviolet absorbers on the color change of pigmented silicone elastomer

Effect of newly developed pigments and ultraviolet absorbers on the color change of pigmented silicone elastomer

To Evaluate and Compare the Effect of Indoor and Outdoor Weathering on Mechanical Properties and Color Stability of High Temperature Vulcanized Maxillofacial Elastomer Material: An In Vitro Study

Effect of vulcanization temperature and dental stone colour on colour degradation of maxillofacial silicone elastomers

Contact Info

Product

Resources

About