The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

SPECTROPHOTOMETRIC ANALYSIS OF THE INFLUENCE OF METAL SUBSTRATE ON THE COLOR OF CERAMIC

금속하부구조물이 도재의 색조에 미치는 영향에 대한 분광측색분석

  • Lee Su-Ok (Department of Prosthodontics, Division of Dentistry, Graduate School, Kyung Hee University) ;
  • Woo Yi-Hyung (Department of Prosthodontics, Division of Dentistry, Graduate School, Kyung Hee University) ;
  • Choi Dae-Gyun (Department of Prosthodontics, Division of Dentistry, Graduate School, Kyung Hee University) ;
  • Kwon Keung-Rok (Department of Prosthodontics, Division of Dentistry, Graduate School, Kyung Hee University)
  • 이수옥 (경희대학교 치과대학 보철학교실) ;
  • 우이형 (경희대학교 치과대학 보철학교실) ;
  • 최대균 (경희대학교 치과대학 보철학교실) ;
  • 권긍록 (경희대학교 치과대학 보철학교실)
  • Published : 2003.04.01
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Abstract

Statement of problem Metal-ceramic restorations have been used extensively by dental clinicians for nearly 40 years. Strength an functional ability of metal-ceramic restorations are proved to be satisfying, However esthetics and biocompatibility of metal alloy which is used in metal-ceramic restoration is not ideal. Using pure gold as an alternative, have advantage of esthetics, biocompatibility over conventional metal alloy. But there had been little article which studied on the color effect of pure gold on fual porcelain color. Purpose The purpose of this study was to spectrophotometrically evaluate the difference between color of metal alloy(Au-Pt, Ni-Cr) and pure gold, during color masking procedure with opaque porcelain and to analyze the differences, Material and Methods Three types of metal - base metal(Ni-Cr), high gold alloy(Au-Pt), pure gold(GES) - specimen were fabricated 1cm in diameter. Four steps were established - after finishing, after pre-coditioning, after application of first opaque porcelain(0.08mm in thickness), after application of second opaque porcelain(0.15mm in thickness)- and tested color with spectrophotometer every each steps and analyzed with $CIEL^*a^*b^*$ color order system. One-Way ANOVA test was used to and out if there were significant differences between groups tested and Shaffe multiple comparison was used to identify where the differences were. Results 1. After finishing and pre-conditioning, pure gold(GES) group showed most high values in $L^*,a^*,b^*$. 2. After application of first opaque porcelain(0.08mm in thickness), after application of second opaque porcelain(0.15mm in thickness), pure gold(GES) group showed the least difference in $L^*,a^*,b^*$ values and the lowest ${\Delta}E$ value(${\Delta}E$=0.63). 3. After application of first opaque porcelain and after application of second opaque porcelain differences that were significant (P<0.05) between groups were found only in $a^*$ values. 4. Base metal alloy group showed the lowest $a^*$ value in test after application of first opaque porcelain and the highest value in test after application of first opaque porcelain Conclusion Pure gold group and high gold group showed higher $a^*$ values than base metal group when tested after 0.08mm thickness of opaque porcelain was applied and pure gold group showed much similar $L^*,a^*,b^*$ values between 0.08mm thickness and 0.15mm thickness of opaque porcelain. This meant that pure gold was more easily masked by opaque porcelain than the other two groups.

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References

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