Retreatment

Fig. 1

Examination:  On examination, imfitting filling material was visible and secondary caries could be seen around it. 

The 16# tooth had no deep periodontal pockets, no excessive mobility, and no

fluctuating buccal swelling.

Fig. 2

Pre-operative CBCT

CBCT can clearly show that MB2 is missing, and the working lengths and prepared numbers of DB and P are not enough

The diagnosis of 16# apical periodontitis.

Fig. 3

The patient was informed regarding the guarded overall prognosis of this tooth.

Fig. 4

By removing the original uncohesive filling, it can be clearly seen that there is still some caries in the mesial margin, which we must pay attention to and remove before entering the root canal system. This is very important and the key to successful retreatment

Fig. 5

After removing all the infected tissue, we found MB2 and removed the original GP .

Fig. 6

Preparation the root canal by Protaper Gold rotary file and irrigation by 3% NACLO.Irrigation + activation for 15 minutes, strictly following the flushing regimen in SIE's book "Retreatments"

Fig. 7

Sterilize GP with 1% NACLO

Fig. 8

BC sealer(croot sp)+GP obturated the root canal systems by single-cone technique.

Fig. 9

Post operative X-ray

Fig. 10

50 days CBCT Sagittal DB.and MB

Fig. 11

Coronal DB

Fig. 12

50 days CBCT Coronal MB and MB2

Fig. 13

50 days CBCT Sagittal P

Fig. 14

Coronal P

Fig. 15

50 days CBCT Axial

Fig. 16

About the author:

Dr Jialu Shi

Fellow member of Style Italiano Endodontics