A number of causes may be associated with a flare-up of pain in a patient undergoing endodontic therapy.
Patient selection: status post root canal procedure
A flare-up may involve the pulp and/or periradicular tissues.
The most common cause is infection which may be due to:
(1) incomplete removal of the original infected material
(2) pushing infected material into the periapical region
(3) secondary infection after the procedure
Less common causes:
(1) chemical injury (irrigation solutions, root fillings, intracanal drugs, etc)
(2) mechanical trauma
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