US 12,115,031 B2
Dental mill blank and dental prosthesis
Atsushi Matsumoto, Aichi (JP); Hiroyuki Sakamoto, Aichi (JP); Shinichiro Kato, Aichi (JP); and Yoshihisa Ito, Aichi (JP)
Assigned to KURARAY NORITAKE DENTAL INC., Kurashiki (JP)
Appl. No. 17/418,004
Filed by KURARAY NORITAKE DENTAL INC., Kurashiki (JP)
PCT Filed Dec. 25, 2019, PCT No. PCT/JP2019/050893
§ 371(c)(1), (2) Date Jun. 24, 2021,
PCT Pub. No. WO2020/138197, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-243474 (JP), filed on Dec. 26, 2018; and application No. 2019-120129 (JP), filed on Jun. 27, 2019.
Prior Publication US 2022/0087794 A1, Mar. 24, 2022
Int. Cl. A61C 13/00 (2006.01); A61C 13/083 (2006.01); A61C 13/09 (2006.01); A61C 5/70 (2017.01)
CPC A61C 13/0022 (2013.01) [A61C 13/083 (2013.01); A61C 13/09 (2013.01); A61C 5/70 (2017.02)] 14 Claims
OG exemplary drawing
 
1. A dental mill blank that comprises a mill blank portion having a layered structure of two or more layers, and in which the layered structure comprises an enamel layer and a core layer,
the core layer comprising a first portion that is substantially a frustum,
the frustum having a side face forming a part of an interface between the enamel layer and the core layer,
wherein the core layer further comprises a second portion joined to the first portion at a relatively wider base B of the frustum, and
wherein the core layer is shaped to include a step formed by the first portion and the second portion.