| Autor: |
Kheur, Mohit, Sethi, Tania, Coward, Trevor, Kakade, Dilip, Rajkumar, M. |
| Předmět: |
|
| Zdroj: |
Journal of Indian Prosthodontic Society; Jul-Sep2016, Vol. 16 Issue 3, p276-281, 6p, 3 Charts, 2 Graphs |
| Abstrakt: |
Aim and Objective: To compare and evaluate the effect of ultraviolet (UV) stabilizers (Chimassorb 81 and Uvinul 5050) on the color change of pigmented elastomer. Materials and Methods: Two pigments -'Red (P112 Brilliant Red) and Yellow (P106 Yellow) and two UV stabilizers Chimassorb 81 and Uvinul 5050 were studied. A total of six groups of 10 samples each were fabricated using a combination of the above colors and stabilizers: Group A1 -'Red control, Group A2 -'Red + Chimassorb 81, Group A3 -'Red + Uvinul 5050. Group B1 -'Yellow control, Group B2 -'Yellow + Chimassorb 81, Group B3 -'Yellow + Uvinul 5050. All samples were subjected to ageing in an accelerated weathering chamber (Weather-Ometer). Color values L, a, and b were measured at 500 and 1000 h for all samples before and after weathering and change in color (Delta E) was calculated. Results: All groups showed a significant color change. At 500 h, Chimassorb 81 showed a statistically significant lesser change in both colors (red -'3.66 and yellow -'2.8) compared to their control groups (red -'5.19 and yellow -'4.9). At 1000 h, both UV stabilizers showed lesser color change (A2 -'5.49, B2 -'4.28, A3 -'7.47 and B3 -'4.09) as compared to their respective control groups (A1 -'9.57 and B1 -'5.91). Overall, the change in the color with Group A was more than Group B. Conclusion: Addition of UV stabilizers helped the reduction of color change. Chimassorb 81 showed a greater reduction in color change in both colors consistently at 500 and 1000 h. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
