Fig. 11
Special-section root canal files. Reproduced with permission. Source: USPTO, www.uspto.gov: CNIPA, www.cnipa.gov.cn. a The cross-sectional shape of the root canal files in the reference [102]. b Schematic diagram of the cross-section of the root canal files [103] in different positions. c Proximal cross-sections and distal cross-sections in the reference [104]. d Cross-sectional view of the files in the reference [105]. e Cross-sectional view of the files in the reference [106]