AGD Endodontics and Pulpal Therapy 3 — Questions and Answers
Question 1: Which sealer is considered the gold standard for biocompatibility and is resin-based?
- Zinc oxide eugenol sealer (Roth's)
- AH Plus epoxy resin sealer (Correct answer)
- Calcium hydroxide-based sealer
- Glass ionomer sealer
Correct answer: AH Plus epoxy resin sealer
AH Plus is widely regarded as the reference standard sealer due to its excellent sealing ability, low solubility, and biocompatibility.
Question 2: A maxillary first molar most commonly has how many root canals?
- 3
- 4 (Correct answer)
- 5
- 2
Correct answer: 4
Maxillary first molars typically have 4 canals: mesiobuccal 1, mesiobuccal 2 (MB2), distobuccal, and palatal.
Question 3: During pulpotomy in a primary molar, which material has replaced formocresol as the preferred medicament?
- Calcium hydroxide
- MTA (Mineral Trioxide Aggregate) (Correct answer)
- Zinc oxide eugenol
- Glutaraldehyde
Correct answer: MTA (Mineral Trioxide Aggregate)
MTA is now preferred over formocresol for primary molar pulpotomy due to superior success rates and biocompatibility.
Question 4: What radiographic finding is pathognomonic of external cervical resorption?
- Widened PDL space at the apex
- Irregular radiolucency near the CEJ that does not follow the pulp outline (Correct answer)
- Internal resorption with symmetrical ballooning of the canal
- Condensing osteitis below the apex
Correct answer: Irregular radiolucency near the CEJ that does not follow the pulp outline
External cervical resorption presents as an irregular radiolucency at the cervical region that is superimposed on but separate from the pulp space.
Question 5: A patient has a sinus tract. You place a gutta-percha cone through it and take a radiograph. The cone points to tooth #30. This is an example of which diagnostic technique?
- Selective anesthesia
- Test cavity
- Tracing a sinus tract (Correct answer)
- Transillumination
Correct answer: Tracing a sinus tract
Inserting a gutta-percha point into a sinus tract and radiographing it traces the tract back to the source tooth.
Question 6: Sodium hypochlorite accident (extrusion beyond the apex) is managed initially by:
- Immediately filling the canal with calcium hydroxide
- Administering corticosteroids and analgesics and monitoring closely (Correct answer)
- Extracting the tooth to prevent further spread
- Irrigating the site with chlorhexidine
Correct answer: Administering corticosteroids and analgesics and monitoring closely
NaOCl accidents cause tissue necrosis and pain managed with anti-inflammatory medications, analgesics, and close monitoring.
Question 7: Which instrument is used to measure the working length radiographically?
- Endodontic explorer
- K-file placed at estimated working length (Correct answer)
- Periodontal probe
- Digital pulp tester
Correct answer: K-file placed at estimated working length
A K-file is placed to the estimated working length and a periapical radiograph confirms the file's relationship to the apex.
AGD Endodontics and Pulpal Therapy 3
Which sealer is considered the gold standard for biocompatibility and is resin-based?