Fig. 12

Anti-fall root canal files. Reproduced with permission. Source: USPTO, www.uspto.gov: CNIPA, www.cnipa.gov.cn. a–b The files with a rope threading hole [107, 108]. c Root canal files with a stable handle [110]. d–e Magnetic bracelets prevent falling off [109]. f A bending structure prevents falling off [111]. g With a special cylindrical structure [112]