TY - JOUR
T1 - Color changes in dry-pigmented maxillofacial elastomer resulting from ultraviolet light exposure
AU - Beatty, Mark W.
AU - Mahanna, Gordon K.
AU - Dick, Kurt
AU - Jia, Wenyi
N1 - Funding Information:
Extraoral maxillofacial prosthetic devices are essential for restoring missing facial structures that are lost as a result of debilitating conditions, such as head and neck cancer. Materials used for this purpose are elastomers, which are custom-tinted to match the surrounding facial appearance. The fabrication process is labor intensive, and a single prosthesis can be costly to the patient. Unfortunately, these materials demonstrate poor long-term durability, and a prosthesis may become tern or lose its color within a short period of time. This overall deterioration has been attributed to certain environmental factors such as (1) exposure to the ultraviolet component of natural sunlight, (2) wetting and drying of the elastomer, and (3) surface abrasion resulting from the application and removal of cosmetics.l6 Much of the research conducted to date has involved the use of weathering chambers, 79 which are useful in assessing the overall deterioration of materials. However, to engineer a combination of material components that will produce a color-stable prosthesis, it is paramount that the effects of individual environmental variables be better understood. Therefore, the purpose of this Supported by UNMC seed grant 94~72 and College of Dentistry Student Summer Research Fellowship Program. aAssistant Professor and Director, Section of Dental Materials, Department of Adult Restorative Dentistry, College of Den-tistry. bAssistant Professor and Director, Division of Maxillofacial Pros-thodontics and Dental Oncology, Department of Otolaryngolo-gy/Head and Neck Surgery, College of Medicine. cSecond Year Dental Student, College of Dentistry. dBiomaterials Graduate Student, College of Dentistry. Copyright 9 1995 by The Editorial Council of THE JOURNAL OF PROSTHETIC DENTISTRY. 0022-3913/95/$5.00 + 0. 10/1/66353
PY - 1995/11
Y1 - 1995/11
N2 - Five dry pigments and one maxillofacial elastomer were, evaluated for color changes (ΔE) resulting from prolonged exposure to two types of ultraviolet light. The elastomer, pigments, and pigmented elastomers were subjected to each ultraviolet light source for 400, 600, and 1800 hours, and ΔE color shifts were determined. The unpigmented elastomer underwent minimally perceptible color change after 600 hours of exposure to both types of ultraviolet light. Two pigments underwent substantial color change after 400 hours, whereas the remaining three pigments remained color stable after 1800 hours. It was concluded that for the materials tested, early color changes in a prosthesis may be the result of degradation of certain ultraviolet light-susceptible pigments, whereas longer term color shifts may be caused by color changes within the elastomer.
AB - Five dry pigments and one maxillofacial elastomer were, evaluated for color changes (ΔE) resulting from prolonged exposure to two types of ultraviolet light. The elastomer, pigments, and pigmented elastomers were subjected to each ultraviolet light source for 400, 600, and 1800 hours, and ΔE color shifts were determined. The unpigmented elastomer underwent minimally perceptible color change after 600 hours of exposure to both types of ultraviolet light. Two pigments underwent substantial color change after 400 hours, whereas the remaining three pigments remained color stable after 1800 hours. It was concluded that for the materials tested, early color changes in a prosthesis may be the result of degradation of certain ultraviolet light-susceptible pigments, whereas longer term color shifts may be caused by color changes within the elastomer.
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U2 - 10.1016/S0022-3913(05)80351-8
DO - 10.1016/S0022-3913(05)80351-8
M3 - Article
C2 - 8809255
AN - SCOPUS:0029396286
SN - 0022-3913
VL - 74
SP - 493
EP - 498
JO - The Journal of prosthetic dentistry
JF - The Journal of prosthetic dentistry
IS - 5
ER -