ABE ABE Endodontic Surgery 2 — Questions and Answers
Question 1: Which local anesthetic concentration is most commonly used to achieve hemostasis during endodontic surgery?
- 3% Mepivacaine without vasoconstrictor
- 2% Lidocaine with 1:50,000 epinephrine (Correct answer)
- 4% Articaine without epinephrine
- 0.5% Bupivacaine with 1:200,000 epinephrine
Correct answer: 2% Lidocaine with 1:50,000 epinephrine
2% lidocaine with 1:50,000 epinephrine provides superior local hemostasis due to the highest epinephrine concentration available in dental cartridges.
Question 2: What is the primary advantage of using piezoelectric ultrasonic tips for root-end preparation in endodontic surgery?
- Faster cutting speed than rotary burs
- Creates a preparation coaxial with the long axis of the canal (Correct answer)
- Removes more root structure per pass
- Improves visibility by increasing bleeding
Correct answer: Creates a preparation coaxial with the long axis of the canal
Ultrasonic tips create a preparation coaxial with the long axis of the canal, ensuring complete removal of canal contents regardless of root curvature.
Question 3: Which hemostatic agent is commonly placed in the bony crypt to control bleeding before root-end filling placement?
- Oxidized cellulose (Surgicel) (Correct answer)
- Calcium hydroxide paste
- Sodium hypochlorite
- Ferric sulfate
Correct answer: Oxidized cellulose (Surgicel)
Oxidized cellulose (Surgicel) is placed in the bony crypt to achieve hemostasis by activating the clotting cascade upon contact with blood.
Question 4: Which suture type is most appropriate for closure of endodontic surgical flaps?
- 3-0 silk sutures
- 4-0 or 5-0 resorbable sutures (e.g., polyglycolic acid) (Correct answer)
- 2-0 nylon sutures
- 3-0 chromic gut sutures
Correct answer: 4-0 or 5-0 resorbable sutures (e.g., polyglycolic acid)
4-0 or 5-0 resorbable sutures minimize tissue trauma, provide good approximation, and eliminate the need for a suture removal appointment.
Question 5: What is the primary purpose of guided bone regeneration (GBR) membranes used in endodontic surgery?
- They serve as root-end filling materials
- They prevent epithelial downgrowth and promote bone regeneration in large periradicular defects (Correct answer)
- They eliminate the need for root-end preparation
- They replace the need for flap closure
Correct answer: They prevent epithelial downgrowth and promote bone regeneration in large periradicular defects
GBR membranes exclude fast-migrating epithelial and connective tissue cells, allowing osteogenic cells to populate and regenerate large periradicular bony defects.
Question 6: Which radiographic appearance confirms complete healing after endodontic surgery?
- Persistent radiolucency at the apex
- Complete radiographic resolution of the periradicular radiolucency (Correct answer)
- Widening of the PDL space
- Root resorption adjacent to the surgery site
Correct answer: Complete radiographic resolution of the periradicular radiolucency
Complete radiographic resolution of the periradicular radiolucency indicates successful bone regeneration and healing of the surgical site.
ABE ABE Endodontic Surgery 2
Which local anesthetic concentration is most commonly used to achieve hemostasis during endodontic surgery?