Rodolfo Rodriguez,Albert Ruiz-Vela,Farrokh Farzin-Nia,William W. Wood
申请号：
US12617507
公开号：
US09717569B2
申请日:
2009.11.12
申请国别(地区):
US
年份:
2017
代理人:
摘要：
An orthodontic bracket for coupling an archwire with a tooth. The orthodontic bracket including a ceramic injection molded (CIM) bracket body including an archwire slot that is configured to receive the archwire therein. The CIM bracket body including a polycrystalline ceramic. A coating of alumina or silicon dioxide is in continuous and direct contact with at least the surfaces of the archwire slot. The orthodontic bracket is characterized by unexpectedly high torque strength. The ceramic injection molded (CIM) bracket body may include a polycrystalline ceramic having a grain size distribution characterized by an average grain size in the range of larger than 3.4 μm to about 6 μm such that the orthodontic bracket is also characterized by unexpectedly high fracture toughness. A method of making the orthodontic bracket includes injection molding a bracket using a ceramic powder, sintering the molded bracket, and coating the ceramic injection molded bracket.
