We had trouble interpreting your comments but did notice that you've posted them on this page about reusing a crown after root canal treatment has been performed.

As discussed above, if the crown can't be removed for the root canal work and instead has an "access cavity" made through it, the most predictable/safest choice is to have a new crown made. But, per the arguments discussed above, you and your dentist might decide that patching the crown makes an acceptable alternative.

The other issues you discuss are simply one of diagnosis (which dentist is right about what is wrong). Seeking an evaluation from an endodontist often makes a good choice when difficult cases are involved.

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