Clinical Atlas of Retreatment in Endodontics

Dental history: discomfort due to impingement of food inside her molar. Previous treatment done on this tooth 1 year ago.

Clinical examination findings: deep decay, tooth was filled with food remnants, no mobility, no pain to percussion. After cleaning the tooth, big perforation was noted and bleeding also.

Preoperative radiological assessment: deep decay and lesion at furcation area due to perforation ( Figure 1.1).

Diagnosis (pulpal and periapical): previously initiated root canal therapy with asymptomatic apical periodontitis.

First visit: local anaesthesia, rubber dam isolation, magnification (dental operative microscope), conventional access cavity, identification of orifices of the canals, placing cotton pellets inside them, stopping the bleeding physically with cotton pellet ( Figure 1.2).

Treatment plan for management of the endodontic mishap: applying MTA at the furcation area, then inserting a wet cotton pellet over MTA, temporary filling ( Figure 1.3). Figure 1.1 Preoperative radiograph showing radiolucency in the furcation area. Figure 1.2 Clinical picture showing the pulpal floor perforation. Figure 1.3 Radiograph showing MTA placed on the pulpal floor.

Second visit: removing temporary filling and cotton pellets, Check the condition of MTA (hardness), canal preparation with rotary files.

Irrigation protocol (solution and technique): 5.25% NaOCl; passive sonic irrigation.

Final irrigation protocol: 17% EDTA (syringe irrigation) for 1 minute.

Obturation (materials and technique): zinc oxide‐based sealer (SealiteTM Ultra) and gutta‐percha; warm vertical compaction.

Permanent filling ( Figures 1.4and 1.5).

Key points to be taken care of while managing the endodontic mishap.

Stop bleeding before applying MTA.

Place wet cotton pellet over MTA and wait at least 4 hours to let it set.

Follow for 2.5 years. The follow‐up radiograph shows formation of a bony trabecular pattern. Clinical and radiographic healing is evident on follow‐up visits ( Figure 1.6).

Figure 1.4 Radiograph showing master cone verification after biomechanical preparation of root canals.

Figure 1.5 Radiograph showing obturation along with intact MTA.

Figure 1.6 Follow‐up radiograph showing healing in the furcation area.

How to approach a tooth with pulpal floor perforation.

The size and time of perforation do not justify extraction.

The priority is always for perforation repair, so do it as soon as possible.

Overdrilling should be avoided.

Location of canal orifices should be done with an endodontic explorer.

Once the operator feels a drop in the pulp chamber, no more vertical cutting should be done.

Use of safe‐ended, non‐cutting burs is recommended (e.g. Endo‐Z burs).

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