Fibre post length

For a fibre post, is it ideal for it to extend to half the root length or to 2/3 of it?

Translated version of the Turkish original

Because fibre posts bond adhesively, they do not have to be advanced to 2/3 of the canal length. They are generally placed as deeply as the canal anatomy allows.

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.