Non surgical and surgical root canal retreatment

Choose the common cause of RCT failure

• Perforations

• Canal transportation

• Coronal leakage

• Root fracture

What are the advantages of retrograde retreatment?

• eliminate periapical infection

• eliminate intracanal infection

• promote apical healing

• seal portal of exits to root canal system

Identify the main factor that will influence the outcome of non-surgical re-treatment.

• Operator skills.

• Elimination of aetiology.

• Presence of signs and symptoms.

• Material used for apical seal.

Which of the following conditions is the common risk for removal of a large screw type post during orthograde retreatment?

• Root perforation.

• Canal transportation.

• Root fracture.

• Fractured instrument.

Name the instrument used to negotiate calcified canal.

(a)  

Choose the suitable instrument to remove the ledge.

• Gates-glidden bur

• H-file

• K-file

• Scaler tip

Name the suitable instrument that can be used to remove gutta percha at coronal third.

• H-file

• Goose-neck bur

• Ultrasonic scaler

• Gates-glidden bur

Pick the contraindications of retrograde retreatment.

• Fractured instrument at apical third.

• Large active post in canal.

• Short root length.

• Uncontrolled Diabetes

Which of the following re-treatment conditions has similar treatment outcome as primary RCT?

• Presence of apical lesion less than 5mm.

• Perforation repaired with MTA.

• Canal ledge negotiated and canal instrumented to working length.

• Extruded gutta percha and apical inflammatory tissues removed through apical surgery.

How many cases of root canal treatment (canals) do you have?

• 0

• 1

• 2

• 3

• 4