The broach.
Glenner
R A
RA
D003737:Dental Cavity Preparation / Q000295:instrumentation; D003762:Dental Instruments / Q000266:history*; D005602:France; D049672:History, 19th Century; D049673:History, 20th Century; D012390:Root Canal Therapy / Q000295:instrumentation; D014481:United States