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- W2364153967 abstract "Objective To analyse the color change of shade guides with gingiva-indicator, and to predict efficacy of color matching for esthetics and restorations on condition of using gingiva-indicator.Methods Two sets of shade guide(Vintage Halo) including 58 samples were measured under black background with colorimeter,and repeated when the samples were set on Gingiva-indicatorgum L,gum M,gum D respectively.The data were recorded with CIE L*a*b* system,L*,C*ab,H0ab and ΔE(CIEL*a*b*) were calculated.L*=L*,C*ab=(a *2 +b *2 ) 1/2 ,H0ab=tag -1 (b*/a*)*180/3.1416,ΔE(CIEL*a*b*)=[(ΔL*)2+(Δa*)2+(Δb*)2] 1/2 .Results The value of L* and C*ab had little change when the samples were set on gingiva-indicator. The value of H0ab was decreased significantly. Its range was from 0.52 to 4.49 for Gum L group, 0.90 to 4.80 for Gum M group, 0.66 to 4.41 for Gum D group.The average of color-difference was 1.804 for Gum L group, 1.676 for Gum M group, 1.652 for Gum D group.Conclusion The color of shade guides had changed when the samples were set on gingiva-indicator. The change could have affected the color matching for esthetics and restorations." @default.
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- W2364153967 date "2007-01-01" @default.
- W2364153967 modified "2023-09-26" @default.
- W2364153967 title "Color change of shade guides with gingiva-indicator" @default.
- W2364153967 hasPublicationYear "2007" @default.
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