PMC7006591_01
A preoperative PA radiograph showing a periradicular radiolucency associated to tooth #17 with previously treated canals
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F1
Periapical (PA) radiograph (Fig. 1) showed previous root canal treatment with adequate length control on all three roots.
After IR, a PA radiograph was taken to confirm the tooth replanted into the original position and with good white MTA retrograde filling
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F2
PA radiograph (Fig. 2) was obtained showing the tooth was replanted to the original position and with acceptable retrograde filling. Postoperative instruction was given to the patient.
The patient presented with clinical signs and symptoms of chronic periradicular abscess at 10 months of follow-up. The radiograph showing a gutta percha traced the sinus tract on the buccal gingiva to the PA region of the disto-buccal root
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F3
The sinus tract was traced with gutta percha prior to obtaining a PA radiograph (Fig. 3), and the gutta percha was traced with the sinus tract to the disto-buccal root.
Axial view of CBCT images showing no sign of external root resorption and ankyloses. (a) Coronal third, (b) middle third, (c) apical third
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F4
There was no sign of external root resorption and ankylosis detected, and this has been confirmed after the cone beam computed tomography (CBCT) (Fig. 4) was obtained.
Radiograph taken after the removal of the root filling material. The MTA retrograde filling was left in situ
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F5
Full instrumentation was done with Race file (FKG Dentaire, La Chaux-de-Fonds, Switzerland) until #40/04 on MB1, MB2, and DB canals and #60/04 on P canal, with leaving the MTA retrograde filling in situ (Fig. 5).
Radiograph taken immediately after non-surgical retreatment. A partial resolution of the PA radiolucency was observed
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F6
A final PA radiograph (Fig. 6) was obtained to confirmed good or adequate obturation.
Radiograph taken at 1 year of follow-up showing no periradicular radiolucency on tooth #17. However, a periradicular radiolucency was detected on the mesio-buccal root of tooth #16
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F7
PA radiograph (Fig. 7) was taken, and it showed complete resolution of the PA radiolucency, with bone filling in the previous radiolucent region.