<prompt> Vitality test has to be done over a PFM crown, which is the best test to be done in order to check the vitality:EPT.Cold test.Cavity test.All of the above.  <response>: For PFM EPT is contraindicated, instead cold test With CO2 snowTRIGIDENT is a test of Choice. Temperature of dry iceCO2 snow is78oC . 