Here's the issue:
Right lower tooth second to back with newer porchelain crown (~6
months).

Severe tooth ache:  Eating, biting, and pressing on it with finger
causes lots of pain.  Not doing any thing to it, and it still throbs.
Cold doesn't seem to cause any more pain than no cold.
Advil helps slightly, vicoten es helps but not completely.
Biting down hurts, letting up doesn't hurt.

I had dental work done on the other side of the mouth Friday a
nd a bite block was used on the problem side.  There was general
soreness that evening, the next day pain when eating and progressively
worst Sunday and Sunday night.

I am wondering if (biting) the bite block may have caused some trauma
to the tooth and hope that what ever happened it may just get better
w/o the need for a root canal as I under stand a tooth is better
w/ it's nerve / pulp then dead.

Can an x-ray reveal useful information on a tooth w/ a crown?

If the tooth is damaged, can a crown be removed w/o adversely
affecting the tooth or tissue?

What would be a good guestimate as to the problem and solution?

I would hope I could avoid a root canal for the health of the tooth
and of course the $ and fun procedure but am I being realistic that
the tooth may get better reasonably soon by itself or by another
procedure (such as crack repair or such)?

Thanks!