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Wikipedia definition
1. Endodontic files and reamersEndodontic files and reamers are surgical instruments used by dentists when performing root canal treatment. These tools are particularly used to clean and shape the root canal, with the concept being to perform complete chemomechanical debridement of the root canal to the length of the apical foramen. Files are commonly made from metal; usually stainless steel or nickel-titanium alloy. Files may be made from metal blanks that are twisted or machined to produce various sizes and tapers.
Read “Endodontic files and reamers” on English Wikipedia
Read “ニッケルチタンファイル” on Japanese Wikipedia
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