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Evaluation of the effect of UV stabilizers on the change in colour of a silicone elastomer following ageing by three different methods -An In-Vitro Study

Research output: Contribution to journalArticle

Mohit Kheur, Dilip Kakade, Tania Sethi, Trevor Coward, M Rajikumar

Original languageEnglish
Pages (from-to)18-23
Number of pages6
JournalJournal of Dental Research and Scientific Development
Issue number1
Publication statusPublished - Jan 2016


King's Authors


Aim and Objective: To compare and evaluate the effect of ultraviolet (UV) stabilizers (UV absorbers [UVA] and hindered amine light stabilizers [HALS]) on the color change of a commonly used silicone elastomer subjected to aging by three different methods.

Materials and Methodology: Four groups of 30 samples each were studied; Group A - Control, Group B - Silicone + UVA (Chimassorb 81), Group C - Silicone + HALS (Uvinul 5050), and Group D - Silicone + Combination (UVA + HALS) (Chimassorb 81 + Uvinul 5050). Each group was further divided into groups of 10 samples each based on the method of aging - accelerated weathering chamber (Weather - Ometer), artificial perspiration, and a cleansing agent. Commission Internationale d’Eclairage Lab color values L*, a*, and b* were measured for all samples before and after weathering and change in color (Delta - E) was calculated. One - way ANOVA was applied to compare the mean values of the four groups and the post hoc Tukey test was carried out to compare between two groups.

Results: All groups showed a significant color change. For Group A, the color change (average Delta E) for accelerated weathering, artificial perspiration, and cleansing agent was 1.479, 0.617, and 0.62, respectively. Similarly, for Group B, it was 1.109, 0.509, and 0.507; for Group C, it was 1.866, 0.652, and 0.997; and for Group D, it was 1.303, 0.829, and 1.033, respectively. UVA (Chimassorb 81) showed the least change consistently in all three types of aging.

Conclusion: Addition of UV stabilizer Chimassorb 81 showed a reduction in color change of the silicone elastomer. Following studies on the effect of these additives on the physical properties of elastomers has shown that they can have a potential use in maxillofacial prosthetic rehabilitation

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