Testing: Not sure what testing you are referring to however if a root canal is leaking and xray may show a shadow at the root tip and the tooth may or may not be sensitive to biting or tapping see your dentist or endodontist if you have any symptoms or suspect there may be an issue.
Answered 11/20/2013
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Coronal leakage: is a major cause of root canal failure. Unfortunately, such phenomena cannot be predicted.
Answered 9/12/2014
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