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), and a periapical diagnosis, which indicates the status of the periapex (tissue around the end of the root... diagnostic terminology defined by the American Board of Endodontics simplifies the periapical diagnosis based... 
Periapical abscess
To follow up with the wildly popular Paucis Verbis card made by Dr. Hans Rosenberg (University of Ottawa), here is his card on Dental Infections. This card summarizes...
This root canal was originally done in 1965. A periapical lesion has developed... this a "root canal upgrade". Preserving this tooth preserves the periapical tissues and helps to maintain...
When endodontically treating a tooth experiencing symptoms to percussion, that is symptomatic apical periodontitis or acute apical abscess, it is reasonable and normal to expect those symptoms to persist a few days follow
furcal lesion as well as periapical lesion were noted. Retreatment was recommended. Upon access... was repaired using MTA.
Post-Op films shows the MTA repair in the furcal area. Note the large lesion...
in normal background radiation.
As you can see, one periapical film with d-speed film exposes a patient to 0.0095mSv (which is the equal to about 1.1 days of natural radiation).
A digital periapical film...
the same amount of radiation a patient would receive with 9 digital periapical films (0.003mSv).
The volume... over and over to gather unlimited amount of information about the tooth and it's periapical tissues.
A CBCT scan...
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This may be an important tool to help you identify a cracked tooth. Accurate pulpal and periapical diagnostics...
DX: Prior RCT w/ Chronic Apical Abscess
Huge periapical lesion noted. A thin, short (mesial) and long (distal) obturation.
Retreatment recommended.
Retreatment completed.
4 month initial... 
