公开(公告)号：US11370702B2

公开(公告)日：2022-06-28

申请号：US15160432

申请日：2016-05-20

Applicant: DENTSPLY SIRONA Inc.

Inventor： Stefan Fecher ,  Lothar Völkl

IPC: C03B32/00 ,  C03C21/00 ,  C03C4/00 ,  C03C3/097 ,  A61K6/804 ,  A61K6/818 ,  A61K6/822 ,  A61K6/824 ,  A61K6/833 ,  A61K6/853 ,  C03B25/00 ,  C03C10/00

Abstract: The invention relates to a method to derive a medical form body of lithium silicate glass ceramic. To increase its strength it is proposed that in the form body comprising lithium silicate glass or containing lithium silicate glass the lithium ions are replaced by alkali ions of greater diameter to generate a surface compressive stress. To this end the form body is covered with a melt containing an alkali metal for which an aliquoted quantity of salt containing the alkali metal is used.

公开(公告)号：US11166794B2

公开(公告)日：2021-11-09

申请号：US16408626

申请日：2019-05-10

Applicant: DENTSPLY SIRONA Inc.

Inventor： Martin Kutzner ,  Stefan Fecher ,  Lothar Völkl

IPC: A61C13/00 ,  A61C13/083 ,  B23Q3/02

Abstract: The invention relates to a support body for a blank, whereby the support body possesses a receiving opening for the blank that is surrounded by an inner circumferential surface, which terminates in an upper and a lower edge, and whereby a blank fixed in position within the support body is bonded to the latter by means of an adhesive agent. In order to be able to easily introduce the adhesive agent into a gap between the blank and the support body it is intended that the inner circumferential surface possesses at least one depression and/or elevation extending to accommodate the adhesive agent.

公开(公告)号：US11040909B2

公开(公告)日：2021-06-22

申请号：US15160529

申请日：2016-05-20

Applicant: DENTSPLY SIRONA Inc.

Inventor： Lothar Völkl ,  Stefan Fecher

IPC: C03B25/00 ,  C03C17/22 ,  C03C21/00 ,  C03C4/00 ,  C03C3/097 ,  A61K6/20 ,  A61K6/804 ,  A61K6/818 ,  A61K6/822 ,  A61K6/833 ,  A61K6/853 ,  C03C10/00

Abstract: The invention relates to a method to increase the strength of a form body of lithium silicate glass ceramic, which after it has a desired end geometry and after the application of a material which influences its surface to form a coating, is subject to a heat treatment. To create a surface compressive stress through the replacement of lithium ions by alkali ions of greater diameter at least that region not covered by the application layer is covered by a melt or paste consisting of or containing a salt of an alkali metal with ions of greater diameter and the form body is in contact with the melt or paste for a period of time t at a temperature T and the melt or paste is subsequently removed from the form body.

公开(公告)号：US12251277B2

公开(公告)日：2025-03-18

申请号：US17592677

申请日：2022-02-04

Applicant: DENTSPLY SIRONA INC.

Inventor： Stefan Fecher ,  Lothar Völkl ,  Sven Giese ,  Tobias Rösch ,  Andreas Gebhardt

IPC: A61C13/00 ,  A61C13/20 ,  B28B3/02 ,  B28B3/08 ,  B30B11/02 ,  B30B15/02 ,  A61C13/09 ,  A61C13/225 ,  B22F3/03 ,  B28B11/24

Abstract: A method for forming a multi-layer blank of a ceramic material including the steps of: providing a mold that includes at least one side wall surrounding a lower press plunger to form a cavity therebetween, wherein the lower press plunger has a movable pin; filling into the mold a first ceramic material; extending the movable pin from an upper surface of the lower press plunger and into the cavity; pressing a first upper press plunger against the first ceramic material so that a first open cavity is formed while at least a portion of the first upper press plunger is in contact with the movable pin to maintain the through-hole through the first layer; filling into the mold a second ceramic material of a different composition; extending the movable pin from an upper surface of the first layer and into the first open cavity; and pressing a second upper press plunger against the second layer so that a second open cavity is formed in communication with the through-hole that extends through the first and second layers to form the blank.

公开(公告)号：US20190274798A1

公开(公告)日：2019-09-12

申请号：US16408626

申请日：2019-05-10

Applicant: DENTSPLY SIRONA Inc.

Inventor： Martin Kutzner ,  Stefan Fecher ,  Lothar Völkl

IPC: A61C13/00 ,  A61C13/083 ,  B23Q3/02

Abstract: The invention relates to a support body for a blank, whereby the support body possesses a receiving opening for the blank that is surrounded by an inner circumferential surface, which terminates in an upper and a lower edge, and whereby a blank fixed in position within the support body is bonded to the latter by means of an adhesive agent. In order to be able to easily introduce the adhesive agent into a gap between the blank and the support body it is intended that the inner circumferential surface possesses at least one depression and/or elevation extending to accommodate the adhesive agent.