A heat-treated NiTi rotary file engineered with a unique spring structure on the shaft — minimizing file fracture and maximizing safety throughout root canal treatment.
Conventional NiTi files fracture most often at the shaft. The Spring Endo File introduces a machined spring section that absorbs and distributes load — fundamentally changing how the file behaves under stress.
The spring structure minimizes the possibility of fracture inside the root canal. Load is distributed to the spring, and if overloaded the spring area fractures first — making the file far easier to retrieve.
Spring structure plus heat treatment improves cutting power through micro-vibration. 100% rotational torque is delivered even when the spring is bent 50–60°. Increased durability means more uses per file.
The flexible spring makes treatment comfortable for both patient and dentist — easier for patients who cannot open wide, and no need to excessively remove tooth structure when the canal is off the central axis.
Independent mechanical testing on a 25mm / #25 Spring Endo File quantifies the advantage of spring machining on the file shaft.
85% greater flexibility than non-spring products — exceptionally resistant to fracture, allowing appropriate bending under lateral forces such as a brushing motion.
Superior fatigue fracture resistance in repeated testing within a curved root canal — a clear improvement in the ability to withstand fracture compared to non-spring products.
* Sangmi Ahn, Jung-Hong Ha, Sang Won Kwak, and Hyeon-Cheol Kim. Advancement of Mechanical Properties of Nickel-Titanium Rotary Endodontic Instruments by Spring Machining on the File Shaft. Materials 2020, 13, 5246. Bending-stiffness and NCF figures based on Denflex internal testing using a 25mm / #25 Spring Endo File.
The spring neck flexes with the natural curvature of the canal while still transmitting full rotational torque to the cutting tip — negotiating curves that would stress and fracture a rigid file.
The spring section bends to follow canal curvature, reducing transportation and keeping the file centered — even in sharply curved canals.
100% rotational torque reaches the tip even when the spring is bent 50–60°, so cutting efficiency is maintained around the curve.
Heat-treated files behave as a shape-memory alloy — bent files return to their original shape when warmed with hot water or a dryer.
Heat-treated NiTi endodontic files in 23mm and 25mm lengths, ISO sizes from glide-path to #50. Available in Forward (DFS) and Reverse (DFSR) rotation. Each size packaged 6 files per box.
| ISO Size | Color | 23mm | 25mm |
|---|---|---|---|
| PATH (Glide) | White | ✓ Forward | ✓ Forward |
| #10 | Purple | ✓ F / R | ✓ F / R |
| #15 | White | ✓ F / R | ✓ F / R |
| #20 | Yellow | ✓ F / R | ✓ F / R |
| #25 | Red | ✓ F / R | ✓ F / R |
| #30 | Blue | ✓ F / R | ✓ F / R |
| #40 | Black | — | ✓ F / R |
| #50 | Yellow | — | ✓ F / R |
Codes follow the pattern SFTG6HL{length}#{size}{F/R}-{finish}. Each size is offered in -S (standard pseudoelastic NiTi) and -B (heat-treated shape-memory) finishes.
| Size | 23mm Forward | 23mm Reverse | 25mm Forward | 25mm Reverse |
|---|---|---|---|---|
| PATH | SFPATHHL23#00F | — | SFPATHHL25#00F | — |
| #10 | SFTG6HL23#10F | SFTG6HL23#10R | SFTG6HL25#10F | SFTG6HL25#10R |
| #15 | SFTG6HL23#15F | SFTG6HL23#15R | SFTG6HL25#15F | SFTG6HL25#15R |
| #20 | SFTG6HL23#20F | SFTG6HL23#20R | SFTG6HL25#20F | SFTG6HL25#20R |
| #25 | SFTG6HL23#25F | SFTG6HL23#25R | SFTG6HL25#25F | SFTG6HL25#25R |
| #30 | SFTG6HL23#30F | SFTG6HL23#30R | SFTG6HL25#30F | SFTG6HL25#30R |
| #40 | — | — | SFTG6HL25#40F | SFTG6HL25#40R |
| #50 | — | — | SFTG6HL25#50F | SFTG6HL25#50R |
Get the most from the spring structure. Recommended settings and handling for safe, efficient root canal preparation.
Place the tip on the orifice before rotating. #10 or #15 files are recommended to first locate the orifice in rotation.
Best cutting force range. If cutting power feels insufficient, raise the RPM or torque by one level.
Rotate DFS (Forward) files clockwise and DFSR (Reverse) files counter-clockwise.
Do not apply lateral or downward pressure while the file is rotating in the root canal.
When filing in the canal, lift the file slightly toward the top for better cutting performance.
Used without orifice expansion, the tip 7–8mm can be forced by the canal — even a new file may break immediately.
Remove the file periodically and clear cutting residue from the blade to maintain stable cutting performance.
Administer pre-operational tests only on natural teeth. Do not test on a resin block.
Heat-treated (shape-memory) files return to their original shape when warmed with hot water or a dryer.
An optimized file for treating patients with limited mouth opening and maxillary molars. The shaft can be bent and moved into the oral cavity while maintaining the bent shape formed outside the mouth.
Bend the shaft outside the mouth and bring it to position while it holds the curve — ideal for hard-to-reach posterior access.
Delivers excellent performance in curved root canals without breaking the file.
Request samples, pricing, or a clinical consultation from Digiscope — your authorized partner for Denflex in the Philippines.