US 11,806,202 B2
Mill blank for dental CAD/CAM with cutout portion for positioning
Yusei Kadobayashi, Kyoto (JP); and Masako Shigezawa, Kyoto (JP)
Assigned to SHOFU INC., Kyoto (JP)
Filed by SHOFU INC., Kyoto (JP)
Filed on Aug. 17, 2017, as Appl. No. 15/679,291.
Claims priority of application No. 2016-160255 (JP), filed on Aug. 17, 2016.
Prior Publication US 2018/0055612 A1, Mar. 1, 2018
Int. Cl. A61C 13/00 (2006.01); A61K 6/17 (2020.01); A61K 6/802 (2020.01)
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
OG exemplary drawing
 
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.