PROBLEM TO BE SOLVED: To provide a ceramic blank for multilayer-structure dental cutting processing close to the tone of a natural tooth.SOLUTION: The ceramic blank for dental cutting processing comprises a four-or-more-layer structure in which an E layer (LE, CE) with the lowest saturation and a C layer (LC, CC) with the highest saturation are arranged respectively in parallel and an M layer (LM, CM) are located in parallel in the middle of the two layers. In the ceramic blank, the lightness L* and the saturation C* of each layer satisfy the following relations: LM=(LE+LC)/2×0.97 to 1.03, CM=(CE+CC)/2×0.93 to 1.07, CC>CM>CE.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】天然歯の色調に近い多層構造の歯科切削加工用セラミックスブランクを提供すること。【解決手段】上下表層に彩度が最も低いE層(LE,CE)と彩度が最も高いC層(LC,CC)がそれぞれ平行に配置され、且つそれら2層の中間にM層(LM,CM)が平行に位置する4層以上の層構造からなる歯科切削加工用セラミックスブランクであって、それぞれの層における明度L*及び彩度C*が以下の関係を満足する歯科切削加工用セラミックスブランク。LM=(LE+LC)/2×0.97~1.03、CM=(CE+CC)/2×0.93~1.07、CC>CM>CE【選択図】なし
