Do granuloma, cyst and abscess give any response to the EPT?
[/QUOTE
I think you are referring the the periapical lesions. All of them are usually associated with non-vital tooth and they will not give any response to EPT in that case. You cannot differentiat one from the other by EPT though.
PS. I am only referring to
PERIAPICAL LESIONS : periapical granuloma, periapical cyst or radicular cyst and periapical abscess.