The Journal of Advanced Prosthodontics

  • 제6권6호
  • /
  • Pages.427-433
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  • 2014
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  • 2005-7806(pISSN)
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  • 2005-7814(eISSN)
대한치과보철학회 (The Korean Academy of Prosthodonitics)
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The effect of repeated firings on the color change of dental ceramics using different glazing methods

  • Yilmaz, Kerem (Dental Clinic) ;
  • Gonuldas, Fehmi (Department of Prosthodontics, Faculty of Dentistry, Ankara University) ;
  • Ozturk, Caner (Department of Prosthodontics, Faculty of Dentistry, Ankara University)
  • 투고 : 2013.11.30
  • 심사 : 2014.08.25
  • 발행 : 2014.12.31
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초록

PURPOSE. Surface color is one of the main criteria to obtain an ideal esthetic. Many factors such as the type of the material, surface specifications, number of firings, firing temperature and thickness of the porcelain are all important to provide an unchanged surface color in dental ceramics. The aim of this study was to evaluate the color changes in dental ceramics according to the material type and glazing methods, during the multiple firings. MATERIALS AND METHODS. Three different types of dental ceramics (IPS Classical metal ceramic, Empress Esthetic and Empress 2 ceramics) were used in the study. Porcelains were evaluated under five main groups according to glaze and natural glaze methods. Color changes (${\Delta}E$) and changes in color parameters (${\Delta}L$, ${\Delta}a$, ${\Delta}b$) were determined using colorimeter during the control, the first, third, fifth, and seventh firings. The statistical analysis of the results was performed using ANOVA and Tukey test. RESULTS. The color changes which occurred upon material-method-firing interaction were statistically significant (P<.05). ${\Delta}E$, ${\Delta}L$, ${\Delta}a$ and ${\Delta}b$ values also demonstrated a negative trend. The MC-G group was less affected in terms of color changes compared to other groups. In all-ceramic specimens, the surface color was significantly affected by multiple firings. CONCLUSION. Firing detrimentally affected the structure of the porcelain surface and hence caused fading of the color and prominence of yellow and red characters. Compressible all-ceramics were remarkably affected by repeated firings due to their crystalline structure.

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