Method for producing a multi-layer blank with a through-hole

US12251277B2 · kind B2 · utility

Assignee

• Dentsply Sirona Inc. · US

Inventors

• Stefan Fecher · Goldbach, DE
• Lothar Volkl · Goldbach, DE
• Sven GIESE · Hanau, DE
• Tobias Rösch · Reichenberg, DE
• Andreas Gebhardt · Apolda, DE

Key dates

• Filing date: Feb 4, 2022
• Grant date: Mar 18, 2025
• Expiry date: Oct 27, 2043

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B28B11/243
• WIPO field: Medical technology
• WIPO sector: Instruments

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.