#40 x 21mm Pac-File NiTi Rotary File with 0.04 Taper – 6/Pack (FNT210440)

• An endodontic instrument set used for efficient root canal shaping and cleaning, containing 6 nickel-titanium (NiTi) rotary files with a 21mm length and a constant .04 taper

• Comparable to K3, Vortex, HyFlexNT, Endosequence

Uses

• Final Apical Enlargement:

• Functions as a master apical file to widen and finish the apical third of larger canals (such as palatal roots of maxillary molars or distal roots of mandibular molars)

• Posterior Endodontics:

• Optimized for treating molars in patients with limited mouth opening, where a short 21mm length prevents handpiece head impingement against opposing teeth

• Straight and Wide Canals:

• Safely prepares wide, straightforward root pathways that require a larger master file size

• Gutta-Percha Removal:

• Acts as an efficient retreatment tool to engage, break up, and extract old obturation materials from wide canal spaces

• Constant-Taper Protocols:

• Integrates smoothly into standard crown-down or single-length mechanical preparation techniques

• Universal Handpiece Integration:

• Operates reliably across all common rotary endodontic techniques designed for constant-taper sequences

Features

• Super-Elastic USA NiTi Alloy:

• Manufactured from premium American nickel-titanium alloy, maintaining high flexibility despite its larger size #40 core diameter

• Size #40 Tip Profile:

• Features an ISO standardized 0.40mm tip diameter paired with a predictable, constant 0.04 taper

• No-Rebound Pre-Bending:

• The advanced metallurgy enables manual pre-bending to negotiate apical curves or steps without a stiff spring-back action

• Flute Unwinding Safety Mechanism:

• Under excessive torsional stress or binding, the metallic flutes visibly unwind instead of fracturing immediately, giving a distinct visual warning to discard the file

• Color-Coded Handles:

• Outfitted with a silver handle denoting the 0.04 taper family, alongside a black ISO color band indicating size #40

• Industry Compatibility:

• Comparable in function to systems like K3, Vortex, HyFlex NT, and Endosequence

Benefits

• High Breakage Resistance:

• Delivers up to 490% greater resistance against cyclical fatigue breakage compared to conventional, untreated rotary files

• Preserves Canal Anatomy:

• Despite its larger diameter, the flexible NiTi core remains centered to minimize risks of canal transportation, zipping, or ledge formation

• Rapid Debris Clearance:

• The large flute design paired with a 3-fluted cross-section maximizes dentin cutting and keeps debris moving coronally

• Direct System Compatibility:

• Serves as a seamless clinical alternative to market-leading file sequences like K3, Vortex, HyFlexNT, and Endosequence without needing adjustments to pre-set motor settings