5Richard E,McPhee.Extrinsic coloration of ceramometal restoration[J].Dent Clinic North Am,1985,29(4):645-647.
6Sproull RC.Color matching in dentistry.Part Ⅱ:practical application of the organizaton of color[J].Prosthet Dent,1973,29(4):556-558.
7Vryonis P.Aesthetics in ceramics:perceiving the problem.see:preston JD.Perspectives in dental ceramics[J].Chicago:Quintessence Pulb Co Inc,1988,23(2):285-287.
8Chen JH,Shi CX,Wang M,et al.Clinical evaluation of 546 tetracline-stained teeth treated with porcelain laminate veneers[J].J Den,2005,33(1):3-8.
