公开(公告)号：US20180147034A1

公开(公告)日：2018-05-31

申请号：US15627690

申请日：2017-06-20

申请人： SHOFU INC.

发明人： Yasuhiro TORITA ,  Yusei KADOBAYASHI

IPC分类号： A61C13/00 ,  A61C5/77

摘要： A dental mill blank having a multi-layer structure has been required to improve the reproducibility of a color tone of the natural tooth in a dental crown restoration cut by CAD/CAM technique. Especially, a reproduction of the color tone of a cavity or a groove is required in a dental crown form of the molar tooth.The present disclosure provides a dental mill blank having three or more layers wherein a color of a 30% position layer which includes a 30% position which is a position spaced from a surface of the dental mill blank of a W layer-side by 30% satisfies a specified relational expression, and a contrast ratio of the 30% position layer is within a range of the contrast ratio of the D layer×(0.70 to 1.00).