2Rubino M, Garcia JA, Jimenez del Barco L, et al. Colour measurement of human teeth and evaluation of a colour guide[J].Color Res Appl, 1994, 19(1) : 19-22.
3Barrett AA, Grimando N J, Anusavice KJ, et al. Influence of tab and disk design on shade matching of dental porcelain[J]. J Prosthet Dent, 2002, 88 (6) : 591-597.
4Barghi N, Lorenzana RE. Optimum thickness of opaque and body porcelain[J]. J Prosthet Dent, 1982, 48(4):429-431.
5Douglas RD, Brewer JD. Acceptability of shade differences in metal ceramic crowns[J]. J Prosthet Dent, 1998, 79(3):254-260.
6Johnston WM, Ma T, Kienle BH. Translucency parameter of colorants for maxiUofacial prostheses[J]. Int J Prosthodont, 1995,8 (1) : 79-86.
