CPC A61C 13/0022 (2013.01) [A61C 13/0004 (2013.01); A61K 6/17 (2020.01); A61K 6/802 (2020.01); Y10T 428/12229 (2015.01)] | 12 Claims |
1. A mill blank for dental CAD/CAM for preparing a dental restoration by being installed in a CAD/CAM device, wherein,
the mill blank for dental CAD/CAM has a columnar shape,
the mill blank for dental CAD/CAM has at least two recesses which includes a first recess opening to an upper surface of the mill blank for dental CAD/CAM and a second recess opening to a bottom surface of the mill blank for dental CAD/CAM, and a circumference portion separating the first recess and the second recess, wherein the circumference portion contains only one notched portion for installing the mill blank for dental CAD/CAM in the same direction,
the first recess and the second recess respectively include a first surface which is parallel to the upper surface and the bottom surface and a second surface which is a circumferential surface concentric with the circumferential surface of the mill blank for dental CAD/CAM and is vertical to the first surface,
the notched portion is composed of a plane surface and a circular arc surface which are parallel to the center axis of the columnar shape of the mill blank for dental CAD/CAM and contacts with the second surface,
a portion of the notched portion contacting with the second surface of the recess is the circular arc surface.
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