	US 12,239,500 B2
	Pre-sintered multi-layered dental mill blank, process for preparing the same, and uses thereof, and a sintering process
Frank Rothbrust, Rons (AT); Sasa Lukic, Lindau (DE); Christian Ritzberger, Grabs (CH); and Corina Serban, Goldach (CH)
Assigned to Ivoclar Vivadent AG, Schaan (LI)
Filed by Ivoclar Vivadent AG, Schaan (LI)
Filed on Feb. 13, 2024, as Appl. No. 18/440,645.
Claims priority of provisional application 63/485,147, filed on Feb. 15, 2023.
Prior Publication US 2024/0277456 A1, Aug. 22, 2024
Int. Cl. A61C 13/00 (2006.01); A61C 13/08 (2006.01); A61C 13/083 (2006.01); B32B 18/00 (2006.01); C04B 35/486 (2006.01)

CPC A61C 13/0022 (2013.01) [A61C 13/0004 (2013.01); A61C 13/082 (2013.01); A61C 13/083 (2013.01); B32B 18/00 (2013.01); C04B 35/486 (2013.01); A61C 2201/002 (2013.01); B32B 2307/4026 (2013.01); C04B 2237/348 (2013.01); C04B 2237/58 (2013.01); C04B 2237/704 (2013.01)]

20 Claims

1. A pre-sintered multi-layered dental mill blank comprising the following layers:

a top layer L4,

an intermediate layer L3,

an intermediate layer L2, and

a bottom layer L1,

and the layers L4 to L1 comprising the components as defined in Table I herein below, wherein the indicated weight amounts are based on a total weight of the respective layer:

TABLE I

	Combined			Coloring
	amount			metal
	of ZrO₂and	Al₂O₃	Y₂O₃	oxides	ZnO
Layer	HfO₂[wt. %]	[wt. %]	[wt. %]	[wt. %]	[wt. %]

L4	>87	<0.01	9-12	0.02-1.5	0.02-0.80
L3	>88	0.02-0.20	8-10	0.02-1.5	0.02-0.80
L2	>90	0.05-0.50	6-8	0.02-1.5	0.02-0.80
L1	>90	0.05-0.50	5-7	0.02-1.5	0.02-0.80