The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

THE INFLUENCE OF PORCELAIN LAYER THICKNESS AND COLOR ON THE FINAL SHADE OF CERAMIC RESTORATIONS

도재층의 두께와 색이 도재수복물의 최종 색조에 미치는 영향

  • Seong Dong-Hwan (Department of Prosthodontics, School of Dentistry, Chonbuk National University) ;
  • Lee Im-Gi (Department of Prosthodontics, School of Dentistry, Chonbuk National University) ;
  • Sohng Jin-Won (Department of Prosthodontics, School of Dentistry, Chonbuk National University) ;
  • Bok Won-Mi (Department of Prosthodontics, School of Dentistry, Chonbuk National University) ;
  • Ahn Seung-Geun (Department of Prosthodontics, School of Dentistry, Chonbuk National University) ;
  • Park Charn-Woon (Department of Prosthodontics, School of Dentistry, Chonbuk National University)
  • 성동환 (전북대학교 치과대학 치과보철학교실) ;
  • 이임기 (전북대학교 치과대학 치과보철학교실) ;
  • 송진원 (전북대학교 치과대학 치과보철학교실) ;
  • 복원미 (전북대학교 치과대학 치과보철학교실) ;
  • 안승근 (전북대학교 치과대학 치과보철학교실) ;
  • 박찬운 (전북대학교 치과대학 치과보철학교실)
  • Published : 2005.10.01
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Abstract

Statement of problem: Ceramic restorations should be made of porcelain layers of different opacity, shade, and thickness in order to provide a natural appearance. Lithium disilicate glass-ceramic system has superior color reproducibility, because it uses the ceramic ingot which is similar to teeth shade and uses the staining technique and layering technique. However, staining technique has a fault of discoloration. Also, porcelain is divided core and dentin layer, it is not enough to study about the influence of porcelain layer thickness and shade on the shade of ceramic restorations. Purpose: The purpose of this study was to evaluate the influence of porcelain layer thickness and color on the final shade of ceramic restorations. Materials and method: The CIE $L^*a^*b^*$(CIELAB) values of 72 assembled specimens, each consisting of 3 discs (enamel porcelain 0.2 mm/dentin porcelain -1.2, 0.9, 0.7, 0.5 or 0.3 mm/ceramic core -0.3, 0.5, 0.7, 0.9 or 1.2 mm, diameter is 1.0 mm) were evaluated with a spectrophotometer (Model Chromaview 300, Spectron Tech Co, Korea) for the shade A1, A2, A3 and A4. Distilled water (refractive index: 1.7) was used to attain optical contact between the layers. White, white gray, and white brown backgrounds were used to assess the influence of the background on the final shade. And the mean color difference value$({\Delta}E)$ was calculated. Results and conclusion: The results obtained from this study were as follows. 1. There was a significant correlation between the thickness ratio of the ceramic core/dentin porcelain system and $L^*,\;a^*\;and\;b^*$ values when the total thickness of specimen combination was smaller than 1.4 mm(P<0.05). 2. The specimen which the ceramic core thickness was more than 0.7 mm had the best masking effect against background colors. 3. The mean color difference value$({\Delta}E)$ is smaller than 2 $({\Delta}E<2)$ when the ceramic core thickness was larger than 0.7 mm and the total thickness of specimen was more than 1.4 mm.

Keywords

References

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