title: Influence of pigments and pigmenting methods on color stability of different silicone maxillofacial elastomers after 1-year dark storage.
abstract: OBJECTIVE
  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.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey.
authors.forename: Merve
authors.initials: M
authors.lastname: Bankoğlu
authors.forename: Ihsan
authors.initials: I
authors.lastname: Oral
authors.forename: Esma Başak
authors.initials: EB
authors.lastname: Gül
authors.forename: Handan
authors.initials: H
authors.lastname: Yilmaz
mesh_terms: D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D003624:Darkness; D006801:Humans; D006813:Humidity; D008422:Materials Testing; D008447:Maxillofacial Prosthesis; D017797:Prosthesis Coloring / Q000379:methods*; D011474:Prosthesis Design; D012826:Silicone Elastomers / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods; D013696:Temperature; D013997:Time Factors
chemical_list: D004396:Coloring Agents; D012826:Silicone Elastomers; C044914:cosmesil; C545983:multisil