Table 4 Overview of special-section methods of root canal files
Special-section shape | Method | Performance | Code | Illustrations |
|---|---|---|---|---|
Parallelogram | Asymmetrical design | LCS, GCR | US20150216624 [93] |
|
Convex triangle | Adaptation to different patients | Circumferential HCE, axial FR | CN204446150 [94] |
|
Non-isometric section | Non-isometric section | GF | CN206044757 [95] |
|
Eccentric design | Asymmetrical design | Non-breakable, IS | CN206910405 [96] |
|
Convex quadrilateral | Can overcut | LCS | CN209884369 [97] |
|
Rectangular | Includes two cutting edges | GCR, IS | CN206995351 [98] |
|
Quadrilateral Convexity | With convex ribs | HA, GF | CN204446152 [99] CN204446154 [100] CN204446155 [101] |
|
Irregular shape | Inner joint round | FR, IS | US20170135786 [102] |
|
Irregular shape | Continuous interrupted concave spiral grooves | Variable and flexible length, LCS | US20100297578 [103] |
|
Gradual reduction | Different section shapes | HA, GF, LCS | CN209611357 [104] |
|
Concave polygon | Different rotation directions correspond to different functions | GV, HCE, IS | US20100040994 [105] |
|
Multi-conical | According to different taper functions | GCR, HCE | US20100255442 [106] |
|
