Broken File — Straight Canal

Why this case matters

File separation is the most feared intra-operative incident in endodontics. Training on a controlled straight canal first builds the retrieval instinct before facing curved anatomy.

Training outcomes

• Ultrasonic retrieval technique
• Bypass with small K-files
• Clinical decision-making under pressure

Common mistakes this model helps you avoid

• Forcing rotation against resistance
• Skipping a proper glide path
• Using a worn file on a second canal
• Ignoring cyclic fatigue after heavy use

Suggested training protocol

1. Radiographic confirmation of the fragment position
2. Straight-line access refinement
3. Ultrasonic loosening of dentin around the fragment
4. Bypass attempt with #08/#10 pre-curved K-file
5. Decision: retrieve, bypass, or incorporate

What a successful exercise looks like

• Fragment removed or bypassed without perforation
• Canal patency re-established to the apex
• No ledge created during retrieval