Endodontics · single question
What happened?
During endo on #17, after cleaning/shaping and irrigation, the MB canal suddenly bleeds with pain.
Show answer and explanation
Correct answer: A. Sodium hypochlorite accident
Acute pain/bleeding on irrigation = sodium hypochlorite (NaOCl) accident from apical extrusion.
- A. Correct. Extrusion of NaOCl beyond the apex causes immediate severe pain, bleeding, and swelling — a hypochlorite accident.
- B. Sudden pain + bleeding during irrigation is pathologic, not normal.