Thermal testing for root canal

If thermal testing of a tooth, hot and cold, show no reaction at all (where surrounding teeth show reaction but it subsides quickly when stimuli is removed), does that suggest #3 nerves are dead. Tooth (#3) under a bridge completed 3 years ago experienced intense pain for several days duration on 2 occasions about a year apart, 2 years after bridge completed. Xrays show no indications suggestive of need for root canal. Is thermal reactions enough to diagnose need for root canal?

* Comment notes.

Plain text

  • No HTML tags allowed.
  • Lines and paragraphs break automatically.
Please answer the question so we know you're a human.