Refers to building up of coronal structure when there is insufficient retention for a separate extracoronal restorative procedure. A core buildup is not a filler to eliminate any undercut, box form, or concave irregularity in a preparation.

Core is built around a prefabricated post. This procedure includes the core material.

Endodontic therapy, anterior tooth (excluding final restoration) 

Endodontic therapy, premolar tooth (excluding final restoration)

Endodontic therapy, molar tooth (excluding final restoration)

In lieu of surgery, the formation of a pathway to achieve an apical seal without surgical intervention because of a non-negotiable root canal blocked by foreign bodies, including but not limited to separated instruments, broken posts or calcification of 50% or more of the length of the tooth root.

Considerable time is necessary to determine diagnosis and/or provide initial treatment before the fracture makes the tooth unretainable.

 Retreatment of previous root canal therapy – anterior

Retreatment of previous root canal therapy – premolar