Journal of Dental Rehabilitation and Applied Science (구강회복응용과학지)

Korean Academy of Stomatognathic Function and Occlusion (대한턱관절교합학회)
권호 표지

Translucency and Color Stability of Various Core Ceramics for All-Ceramic Restoration

전부도재수복물을 위한 수종의 코어 세라믹의 반투명도 및 색 안정성

  • Oh, Sang-Chun (Dept. of Prosthodontics, College of Dentistry, Wonkwang University) ;
  • Lee, Hae-Hyoung (Dept. of Biomaterials, College of Dentistry, Dankook University) ;
  • Shin, Mee-Ran (Dept. of Prosthodontics, College of Dentistry, Wonkwang University) ;
  • Park, Kwang-Su (Dept. of Prosthodontics, College of Dentistry, Wonkwang University)
  • 오상천 (원광대학교 치과대학, 치과보철학교실) ;
  • 이해형 (단국대학교 치과대학 생체재료학교실) ;
  • 신미란 (원광대학교 치과대학, 치과보철학교실) ;
  • 박광수 (원광대학교 치과대학, 치과보철학교실)
  • Published : 2007.06.30
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Abstract

Purpose: This investigation was designed to determine the translucency and color stability of various core ceramics for all-ceramic restoration using the CIE $L^*a^*b^*$ system. Material and Methods: IPS e.max Press ceramic(Ivoclar-Vivadent, Liechtenstein), $LAVA^{TM}$ All Ceramic(3M-Espe, Germany), Cercon Smart Ceramic(Dentsply, Germany), and Z-match Ceramic(DentAim, Korea) were used for this study. For the specimens of zirconia oxide ceramics, the as-sintered cylindrical blanks($11.0{\times}25.0mm$) were machined into the shape of a disk(0.4, 0.8, 1.5 mm in thickness, 10 mm in diameters) with a diamond grind machine. The IPS e.max Press specimens ($0.8{\times}10mm$) were fabricated using the "lost wax" technique. CIE $L^*a^*b^*$ coordinates and light transmission were recorded for each specimen with a spectrophotometer(CM-2600d, Minolta, Japan). Color differences were calculated using the equation, ${\Delta}E^*ab=[({\Delta}L^*)2+({\Delta}a^*)2+({\Delta}b^*)2]1/2$. Results: The results were obtained as follows: 1. The most translucent group was IPS e.max Press ceramic that is a glass-ceramic, and $Lava^{TM}$ and Z-match ceramic were more translucent than Cercon Smart ceramic in zirconia ceramic group. 2. In the all groups, there was no significant translucent change after 6 times heat-treatments required to make a final restoration. 3. Colored zirconia was showed more yellowish and dark than uncolored zirconia. 4. After heat-pressing, IPS e.max Press ceramic was showed high ${\Delta}E^*ab$ value(4.1 of eM1, 6.8 of eM2) that means to be more whiter than before heat-pressing. However, there was no color change after additive heat treatments for final restoration. 5. In the colored zirconia groups, there was no significant color change after some heat-treatments required to make a final restoration.

Keywords

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