Common errors
- 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
Mishap Cases
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.
Intermediate
Mishap
Bypass
Why this model
Its clinical value.
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.
Clinical context
How this model trains.
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
Success criteria
- Apical patency confirmed
- Original canal path regained
- Preserved curvature, no transportation
Learning outcomes
What the trainee learns.
- Ledge bypass with pre-curved files
- Tactile feedback recognition
- Restoring canal patency step-by-step
Specifications
Technical details.
- SKU
- 4K-MSH-LG
- Category
- Mishap Cases
- Printing
- 34μm SLA
- Manufactured in
- Cairo, Egypt
- Pricing
- Contact for institutional pricing
Pair with
Models in the same category.
4K-MSH-BF-SC
Broken File — Straight Canal
Simulates a separated instrument 3mm from the apex in a mid-straight canal. T...
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4K-MSH-BF-CC
Broken File — Curved Canal
Separated instrument in a curved canal — the most clinically challenging retr...
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4K-MSH-FP
Furcation Perforation Model
A furcation area perforation requiring hemorrhage control, diagnosis confirma...
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