US 11,986,364 B2
Machinable dental bulk block and method of manufacturing same
Hyung Bong Lim, Gyeonggi-do (KR); and Yong Su Kim, Gangwon-do (KR)
Assigned to HASS CO., LTD., Gangwondo (KR)
Filed by HASS CO., LTD., Gangwon-do (KR)
Filed on Nov. 12, 2020, as Appl. No. 17/096,381.
Claims priority of application No. 10-2020-0125743 (KR), filed on Sep. 28, 2020.
Prior Publication US 2022/0096213 A1, Mar. 31, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61C 13/00 (2006.01); A61C 13/08 (2006.01); A61C 13/083 (2006.01); B28B 11/04 (2006.01); B28B 11/08 (2006.01); B28B 11/12 (2006.01); C03C 4/00 (2006.01); C03C 10/00 (2006.01)
CPC A61C 13/0022 (2013.01) [A61C 13/082 (2013.01); A61C 13/083 (2013.01); B28B 11/044 (2013.01); B28B 11/0845 (2013.01); B28B 11/12 (2013.01); C03C 4/0021 (2013.01); C03C 10/0027 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A machinable dental bulk block that is a glass ceramic block including an amorphous glass matrix and crystalline phases introduced into the matrix,
wherein the crystalline phases comprise a major crystalline phase that corresponds to lithium disilicate and a minor crystalline phase that corresponds to lithium phosphate, and
the machinable dental bulk block is made of a functionally graded material in which the major crystalline phase has a gradient of particle sizes in a depth direction such that particle sizes of the major crystalline phase are decreased in the depth direction from a top surface to a bottom surface of the dental bulk block, the functionally graded material having no interface at a point at which a gradient value of the particle sizes of the major crystalline phase changes,
wherein light transmittance values of the dental bulk block are increased in the depth direction from the top surface to the bottom surface of the dental bulk block,
wherein the bulk block is made from a single glass composition,
wherein the glass composition comprises 65.0 to 73.0 wt % of SiO2, 12.0 to 14.0 wt % of Li2O, 2.5 to 3.5 wt % of Al2O3, 0.12 to 0.22 wt % of ZnO, 1.8 to 3.3 wt % of K2O, 0.3 to 2.0 wt % of Na2O, and 2.0 to 6.0 wt % of P2O5, and wherein a molar ratio of SiO2/(Li2O+K2O) is within a range of 2.4 to 2.9.