HyFlex EDM OneFile 25/~ 25mm (3)

HyFlex EDM · OneFile 25/~ · 25 mm

Small, straight canalsFewer filesClassic HyFlex EDM route

OneFile 25/~ – in small, straight canals, the only shaping file you may need

Coltene’s claim for the OneFile is measured, which makes it worth quoting: “In small, straight canals the usage of the HyFlex™ OneFile can be enough.” After the 10/.05 Glidepath File it shapes to working length; where the canal asks for more, the finishing files follow.

Sizes as Coltene print them: tip diameter / taper. Motor settings from Coltene’s HyFlex EDM instructions for use (REV-06-2025).

This pack: Coltene HyFlex EDM OneFile, Size 25, Variable Taper, 25 mm (Pack of 3) · presterilised
Coltene · Coltène/Whaledent GmbH + Co. KG, Langenau, Germany

What this file does

›  In the instructions. Step 3: “Use the HyFlex EDM 25/.~ OneFile for enlargement of the root canal up to the working length.”
›  Expand when the canal asks. “Depending on the clinical situation the number of files can be reduced or expanded.” The 20/.05 Preparation File can go before it, and the finishing files after.
›  Step back at resistance. “Return to the previous step as soon as resistance is felt.” Patency with a hand file, canal irrigated and lubricated.

Where it sits on the classic HyFlex EDM route

1  Optional coronal access. At your discretion, an orifice opener in the straight part of the canal.

2  Glide path. Glidepath File 10/.05 to working length, at 300 rpm.

3  Shape. OneFile 25/~ to working length. Coltene’s card adds the 20/.05 Preparation File before it where needed.

4  Optional finishing. 40/.04, 50/.03, 60/.02 to enlarge the apical section.

Summarised from Coltene’s HyFlex EDM instructions for use (REV-06-2025) and Coltene’s HyFlex EDM file sequence card. Your clinical judgement governs the case; the instructions for use govern the file.

How every HyFlex EDM file is used

Coltene give one handling rule for every file in the range: “Place the file in the canal without running engine. When the file cannot proceed any further move it back 1mm until it is free of the walls. Then start the engine and proceed forward slowly using tapping movements and without applying pressure.” Irrigate the canal frequently, keep it lubricated, and clean the spirals every time the file comes out.

Questions we get asked

What does the published evidence say?
Coltene cite Kaval et al. (J Endod 2016;42:1840–3), a laboratory study that tested the OneFile against two other rotary files of similar size (25/.08). The OneFile showed significantly higher cyclic fatigue resistance and a larger angle of rotation before fracture – and lower torsional resistance. Laboratory data, OneFile only.

Why is the taper shown as ~?
That is how Coltene print it: the OneFile has a variable taper, and they do not publish it as a single figure, so neither do we.

Which motor settings?
Coltene set 400 rpm and up to 2.5 Ncm for the HyFlex EDM files (the 2025 instructions allow 400–500 rpm on the classic files), and 300 rpm and up to 1.8 Ncm for the glide path files, in continuous rotation on a low-speed contra-angle. Set it in a custom programme on any of the three endo motors we stock: X-Smart® Go · X-Smart® Pro+ · VDW.SILVER® RECIPROC®.

Can I pre-bend them?
Coltene say so: “Like stainless steel files, the HyFlex EDM files can be pre-bent.” They put it down to the Controlled Memory heat treatment of the nickel-titanium.

Anything to check before use?
Coltene’s instructions carry one patient caution: HyFlex EDM files “contain Nickel and Titanium and should not be used on patient with known allergic sensitivity to these metals.” And before each use, a manual check that the file is correctly fixed in the contra-angle.

Complete the case

HyFlex EDM OneFile 25/~, 25 mm (3) · heat-treated NiTi, electric discharge machined · 400 rpm · up to 2.5 Ncm · presterilised · Coltene · REF 60019595