Dental crowns are caps used to reconstruct very dilapidated teeth ( unsightly , cavities, fractures, etc.) whether they are devitalized or not.
For a severely decayed and devitalized tooth, an anchor in the root must be placed before the crown = INLAY CORE or TENON.
The inlay core allows internal consolidation of the tooth and supports the crown.
The installation of a crown is an operation which allows you to regain the comfort of good chewing.