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Dental Research Journal، جلد ۵، شماره ۲، صفحات ۰-۰
عنوان فارسی
چکیده فارسی مقاله
کلیدواژه‌های فارسی مقاله
عنوان انگلیسی Color Stability of Facial Silicone Prosthetic Elastomers after Artificial Weathering
چکیده انگلیسی مقاله Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:Arial; mso-bidi-theme-font:minor-bidi;} Background: External prostheses exhibit an unwanted color change over time. Color deterioration of prosthetic elastomers affects the life expectancy of facial prostheses in a service environment. The effect of different pigmentation and irradiation duration on color stability of four silicone elastomers after artificial weathering was investigated in this study. Methods: The materials used included four different pigmented industrially synthesized RTV (room temperature vulcanizing) silicones. The materials chosen in this study were representative silicone prosthetics that are widely used in the last decade in maxillofacial prostheses. Artificial weathering was performed in a weatherometer of total radiant energy 1.35 W/m 2 (UVA - UVB). The samples were exposed in eight different periods (8, 24, 48, 72, 96, 120, 144, 168 hours). L, a, b readings were obtained before and after weathering from a spectrophotometer to define color changes. Color changes were calculated from the following equation: ΔE = (ΔL 2 + Δa 2 + Δb 2 )½. The data were subjected to two-way analysis of variance at a significance level of α = 0.05. Also, simple mathematical models were developed for color changes. Results: The results showed that color changes depend on irradiation time and initial color of samples. Episil Europe 1 and Episil Africa 3 were identified as the most stable materials since their color changes were not eye detectable. Contrary to materials Episil Europe 2, 3 that showed significant color changes. Conclusion: Artificial weathering caused significant, eye detectable, but yet still clinically acceptable color changes in the examined prosthetic silicone elastomers due to deterioration that occurs through irradiation.
کلیدواژه‌های انگلیسی مقاله Color, degradation, elastomers, prostheses, silicones
نویسندگان مقاله | Panagiota N. Eleni
PhD Student, Department of Process Analysis and Plant Design, School of Chemical Engineering, National Technical University of Athens, Zografou Campus, 15780 Athens, Greece


| Ioanna Katsavou
Assistant Professor, Department of Process Analysis and Plant Design, School of Chemical Engineering, National Technical University of Athens, Zografou Campus, 15780 Athens, Greece


| Magdalini K. Krokida
Associate Professor, Department of Prosthodontics, Division of Removable Prosthodontics, School of Dentistry, University of Athens, 11527 Athens, Greece


| Gregory L. Polyzois


نشانی اینترنتی http://drj.mui.ac.ir/index.php/drj/article/view/54
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/171/article-171-1956211.pdf
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده Original Article(s)
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