When To Place A Prefabricated Post And Core
A prefabricated post is a kind of a metal pin that is placed in the
tooth root to hold it in place. A wide range of prefabricated posts is
available in various shapes and sizes, subject to an individual tooth
structure. Parallel sided prefabricated posts are recommended for
conservatively prepared root canals with a circular cross-section.
A dental crown or bridge is fastened to the post. A prefabricated
dental post is proposed when the root canal has been done and the
natural tooth isn’t supportive enough to restoration.
Indications for Prefabricated Post and Core System:

Amount of tooth structure remaining: excessive loss from
decay and caries, from the previous restoration thus, weaken
teeth would not provide support for the extra-coronal
restoration.

Functional load of the teeth: abutment teeth for a fixed and
removable partial denture, teeth that exhibit extensive wear from
bruxism, heavy lateral function require a post, core, and crown.
What are the Post and Core?
A post and core are a type of dental restorations that are required to
retain a conventional crown. A post is fused into the performed root
canal retaining the core restoration, which in turn retains the final
crown. The benefit of placing a tooth post is to improve the retention
of the dental crown. Posts are usually required for the frontal or
anterior teeth instead of posterior teeth.
Prefabricated Post Dental Types:
Post and core are divided into two main parts; Prefabricated and Cast.
Both the procedures employ a post that is being placed where the root
canal has been performed.
Prefabricated Post and Core takes less time to place as there is not
much lab work required and can be inserted immediately once the
root canal has been performed. After the post is perfectly placed and
cemented into the post space, a core material like dental composite
resin can be stuffed around the post. After the material sets properly,
an impression is taken for the fabrication of the prosthetic crown to fit
an existing removable partial removable dental prosthetics.
A carbon fiber post is a type of prefabricated posts and core which
were proposed to reduce the failure of post-retained restored teeth.
Cast Post and Core can be custom fabricated in cases where the post
space is not suitable for a prefabricated post. Studies have shown
decreased fracture resistance with the cast posts. Cast posts have
added expense as compared to prefabricated posts.
Life of a post and crown depends on the aesthetics and quality of the
dental crown. Nonetheless, no dental crown is made to last eternity
and is subject to fractures.
Are post and core necessary?
Dentists should avoid placing a post when other anatomic options are
available to retain a core. Molars do not require post as pulp chamber
and canal can retain a core usually.
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