公开(公告)号：US20170135785A1

公开(公告)日：2017-05-18

申请号：US15368756

申请日：2016-12-05

Applicant: DENTSPLY SIRONA Inc.

Inventor： Randall MAXWELL ,  Vincent SHOTTON ,  KEVIN WILKINSON ,  Yong GAO

IPC: A61C5/42

CPC classification number: A61C5/42 ,  H01J9/025 ,  Y10T29/49567

Abstract: A hollow endodontic instrument having: a file axis; a proximal end; a tip; and a shaft portion between the proximal end and the tip; wherein the shaft portion defines a hollow void at least partially bounded by a plurality of fingers and a plurality of longitudinal spacings, each finger extends from the proximal end and includes an outer surface and an inner surface extending between longitudinal opposing walls; and wherein a portion of at least one of the longitudinal opposing walls includes a cutting edge.

公开(公告)号：US20190284664A1

公开(公告)日：2019-09-19

申请号：US16429207

申请日：2019-06-03

Applicant: DENTSPLY SIRONA Inc.

Inventor： Dan AMMON ,  Vince K SHOTTON ,  Yong GAO ,  Randall MAXWELL

IPC: C22C18/02 ,  C22F1/10 ,  A61C5/42 ,  C22C19/03 ,  C22C30/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22F1/08 ,  C22C38/40 ,  C22C38/12 ,  C22F1/00 ,  C21D6/00 ,  C21D9/00 ,  C22C9/00 ,  C22C9/06

Abstract: A method for manufacturing a shape-set nonlinear non-superelastic file comprising the steps of: providing a superelastic file having a shaft and a file axis; providing a fixture including a file path being defined by one or more displacement members, the file path configured for receiving the shaft; inserting at least a portion of the shaft into the fixture along the file path, the portion of the shaft including a first portion of the shaft; contacting the first portion of the shaft with a first displacement member of the one or more displacement members such that the first portion of the shaft is displaced from the file axis thereby forming a first offset portion of the shaft; heating the portion of the shaft while inserted in the fixture to a temperature of at least about 350° C. to about 600° C. for a time period of about 3 minutes to about 30 minutes to shape-set the portion of the shaft while altering the austenite finish temperature thereby forming the shape-set nonlinear non-superelastic file; and wherein the altered austenite finish temperature of the shape-set nonlinear non-superelastic file is ranges from about 20° C. to about 40° C.