Root canal access through existing crowns

Doctor, in a patient with an extraoral fistula, is anything needed beyond the standard procedure? I am going to start treatment on tooth 43 in one of my patients. The patient's crowns are joined, and the patient does not want them removed. I will drill through the top. What do you think?

Translated version of the Turkish original

If the patient does not want the crown removed, there are risks: there may be decay beneath the crown, and hypochlorite may leak into the surrounding tissues. Even if there is no leakage, the treatment is highly likely to fail later because of decay.

Author of the original answer: Doç. Dr. İsmail Davut Çapar

Medical review of the Turkish original:

Turkish answer published on this website:

Translation published:

The review date refers to the Turkish original; it does not indicate a separate medical review of the translation.