s9-finals-Retreatment Flashcards
(41 cards)
Answer
What is the primary goal of endodontic retreatment?
To eliminate persistent infection and restore periapical health by correcting deficiencies from previous treatment.
What are the main indications for endodontic retreatment?
Persistent symptoms, radiographic evidence of pathology, and inadequate previous treatment.
What is the most common cause of endodontic failure?
Persistence or reintroduction of microorganisms in the root canal system.
How can inadequate cleaning and shaping lead to endodontic failure?
Residual infected tissue and debris can remain in uninstrumented areas, allowing reinfection.
Why is coronal leakage considered a significant factor in failure?
It allows bacteria and fluids to penetrate and contaminate the root canal system.
What procedural errors commonly contribute to endodontic failure?
Missed canals, ledging, perforations, and instrument separation.
What are the clinical signs that may indicate endodontic failure?
Persistent pain, tenderness to percussion or palpation, sinus tract formation, and swelling.
What radiographic features suggest endodontic failure?
Periapical radiolucency, poorly condensed obturation, and missed canals.
What is the role of CBCT in diagnosing endodontic failure?
It provides 3D imaging to detect missed canals, fractures, and periapical lesions more accurately.
Why is it important to assess the restorability of the tooth before retreatment?
A non-restorable tooth may not benefit from retreatment and may require extraction instead.
What factors influence the decision between nonsurgical and surgical retreatment?
Canal accessibility, quality of previous treatment, patient factors, and prognosis.
What is the first step in nonsurgical retreatment?
Re-entry through the existing coronal restoration or access cavity to locate canal entries.
How is gutta-percha typically removed during retreatment?
Using heat, solvents, ultrasonic instruments, or rotary retreatment files.
What challenges are associated with removing posts during retreatment?
Risk of root fracture, perforation, and damage to remaining tooth structure.
How are separated instruments managed during retreatment?
Retrieval using ultrasonic tips, bypassing with hand files, or surgical removal if necessary.
Why is reshaping and cleaning repeated during retreatment?
To eliminate residual infection and improve the shape for effective obturation.
What irrigants are used during nonsurgical retreatment?
Sodium hypochlorite, EDTA, and chlorhexidine.
How is the canal obturated again after retreatment?
With gutta-percha and sealer using techniques like lateral or warm vertical compaction.
What is the significance of achieving a proper coronal seal after retreatment?
It prevents reinfection by blocking microbial leakage from the oral cavity.
What factors increase the success rate of nonsurgical retreatment?
Complete removal of previous materials, good canal disinfection, and appropriate obturation.
What are the main indications for surgical endodontic retreatment?
Inaccessible canals, persistent periapical pathology, obstruction removal failure, or perforations.
What does an apicoectomy involve?
Surgical removal of the root apex and surrounding infected tissue.
What is the purpose of root-end resection during apicoectomy?
To eliminate the apical portion of the root that may harbor infection or unfilled canals.
