Purpose: The purpose of this study was to measure spectrophotometrically the color changes of pigmented maxillofacial silicone elastomers with different pigments and pigmenting methods after storing 1 year in the dark environment.
Methods: Three maxillofacial silicones, Cosmesil M511 (CosM511), Cosmesil M522 (CosM522), and Multisil-Epithetic (Mult-Epit), were selected for this study. A total of 240 specimens were fabricated; 80 of each of the 3 elastomers (n = 5) (18 mm in diameter and 2 mm in thickness) were prepared in 6 colorant categories (5 colorant and 1 with no colorant). Specimens were stored in a black box representing a condition of total darkness and placed in a dark environment at ambient room temperature (22°C ± 10°C) and humidity (50% ±10%) for 1 year. A color spectrophotometer was used to measure the ΔE* values of the test specimens to determine the color changes.
Results: The lowest color changes were observed in CosM511 in white color (ΔE* = 1.31) and in Mult-Epit in white color (ΔE* = 1.82) in extrinsic coloration group. The highest color changes were observed in yellow color in CosM511 (ΔE*= 21.61) and CosM522 (ΔE*= 23.78) in silicone pigmented intrinsic coloration method. In coloration methods, intrinsic silicone pigmented groups in all colors except brown in Mult-Epit had the highest ΔE* values.
Conclusions: Significant color changes were observed in both pigmented and unpigmented specimens, which were stored in dark environment and not exposed to sunlight.
From the *Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara; and †Department of Prosthodontics, Faculty of Dentistry, Inonu University, Malatya, Turkey.
Received July 18, 2012.
Accepted for publication October 14, 2012.
Address correspondence and reprint requests to Handan Yilmaz, DDS, PhD, Department of Prosthodontics, Faculty of Dentistry, Gazi University, Emek 8.cad. 82.sok, Ankara, Turkey; E-mail: email@example.com
The authors report no conflicts of interest.