DMD Endodontics and Pulp Biology Flashcards

Which endodontic complication involves perforation of the root during instrumentation?

Answer: Strip perforation

Strip perforation occurs in curved canals when over-instrumentation removes too much dentin on the inner curve, creating a lateral communication with the periodontal ligament.

What is a 'ledge' in endodontic treatment?

Answer: An iatrogenic irregularity on the canal wall that prevents instruments from reaching the apex

A ledge is a false canal or shelf created by improper instrumentation that deflects files away from the original canal path and prevents reaching the working length.

What is the treatment of choice for a separated endodontic file that cannot be bypassed or removed?

Answer: Leave in place and monitor if it does not compromise the seal or prognosis

If a separated file cannot be retrieved or bypassed and is short of the apex with the canal otherwise adequately obturated, it may be left in place with monitoring.

Which material is commonly used for perforation repair in endodontics?

Answer: Mineral trioxide aggregate (MTA)

MTA is the preferred material for perforation repair due to its excellent biocompatibility, sealing ability, and capacity to set in a moist environment.

What is the hallmark radiographic sign of a chronic apical abscess?

Answer: Well-defined periapical radiolucency with corticated border

A chronic apical abscess typically shows a well-defined periapical radiolucency with a corticated (sclerotic) border as the body has had time to wall off the chronic infection.

Which procedure is indicated when root canal treatment fails and there is a persistent periapical lesion?

Answer: Periapical surgery (apicoectomy)

Periapical surgery (apicoectomy) with retrograde filling is indicated when conventional retreatment is not possible or fails to resolve a persistent periapical pathosis.