Restorative Dentistry and Endodontics

  • 제42권1호
  • /
  • Pages.9-18
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  • 2017
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  • 2234-7658(pISSN)
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  • 2234-7666(eISSN)
대한치과보존학회 (The Korean Academy of Conservative Dentistry)
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Discoloration of various CAD/CAM blocks after immersion in coffee

  • Lauvahutanon, Sasipin (Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University) ;
  • Shiozawa, Maho (Department of Removable Partial Prosthodontics, Division of Oral Health Sciences) ;
  • Takahashi, Hidekazu (Department of Oral Biomaterials Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)) ;
  • Iwasaki, Naohiko (Department of Oral Biomaterials Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)) ;
  • Oki, Meiko (Department of Basic Oral Health Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)) ;
  • Finger, Werner J. (Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry) ;
  • Arksornnukit, Mansuang (Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University)
  • 투고 : 2016.06.02
  • 심사 : 2016.09.30
  • 발행 : 2017.02.28
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초록

Objectives: This study evaluated color differences (${\Delta}Es$) and translucency parameter changes (${\Delta}TPs$) of various computer-aided design/computer-aided manufacturing (CAD/CAM) blocks after immersion in coffee. Materials and Methods: Eight CAD/CAM blocks and four restorative composite resins were evaluated. The CIE $L^{\ast}a^{\ast}b^{\ast}$ values of 2.0 mm thick disk-shaped specimens were measured using the spectrophotometer on white and black backgrounds (n = 6). The ${\Delta}Es$ and ${\Delta}TPs$ of one day, one week, and one month immersion in coffee or water were calculated. The values of each material were analyzed by two-way ANOVA and Tukey's multiple comparisons (${\alpha}=0.05$). The ${\Delta}Es$ after prophylaxis paste polishing of 1 month coffee immersion specimens, water sorption and solubility were also evaluated. Results: After one month in coffee, ${\Delta}Es$ of CAD/CAM composite resin blocks and restorative composites ranged from 1.6 to 3.7 and from 2.1 to 7.9, respectively, and ${\Delta}TPs$ decreased. The ANOVA of ${\Delta}Es$ and ${\Delta}TPs$ revealed significant differences in two main factors, immersion periods and media, and their interaction except for ${\Delta}Es$ of TEL (Telio CAD, Ivoclar Vivadent). The ${\Delta}Es$ significantly decreased after prophylaxis polishing except GRA (Gradia Block, GC). There was no significant correlation between ${\Delta}Es$ and water sorption or solubility in water. Conclusions: The ${\Delta}Es$ of CAD/CAM blocks after immersion in coffee varied among products and were comparable to those of restorative composite resins. The discoloration of CAD/CAM composite resin blocks could be effectively removed with prophylaxis paste polishing, while that of some restorative composites could not be removed.

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