4K Dental Models
4K-MSH-BF-SC
Ledge Formation Model
Ledge Formation Model · 4K-MSH-LG
A pre-formed ledge in the canal challenges learners to bypass, re-establish patency, and regain the working length without further damage.
IntermediateMishapBypass
Prices are not published — quoting depends on quantity and anatomy level.
Why this case matters
A ledge blocks passage to the apex and forces the file into an artificial path. Recognising it by tactile feedback — before confirming radiographically — is a core manual skill.
Training outcomes
- Ledge bypass with pre-curved files
- Tactile feedback recognition
- Restoring canal patency step-by-step
Common mistakes this model helps you avoid
- Continuing to force the file that created the ledge
- Jumping to rotary on an uncontrolled canal
- Skipping copious irrigation between steps
- Declaring failure before attempting bypass
Suggested training protocol
- Abandon the file that created the ledge
- Pre-curve a new #08 or #10 with a 2 mm sharp bend
- Watch-winding the curve past the ledge
- Confirm patency with a patency file
- Re-establish working length before shaping
What a successful exercise looks like
- Apical patency confirmed
- Original canal path regained
- Preserved curvature, no transportation
Pair it with
Mishap Cases
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