Typically, after the root canal of your tooth has been completed, most dentists would recommend dental crown placement.
In most instances, dentists would tell their patients that a dental post and core must be put before the crown is made.
Dental post and core system is basically a form of dental restoration that is used to offer an anchor for a crown. It can also be used to provide stability to a tooth that is weak.
Definition Of A Core & Benefits Of A Dental Post And Core System
Teeth at certain times may have some portions missing as a result of the fracture, loss of a filling, decay or the creation of an extra-cavity.
Core placement is simply a procedure where the bulk of the missing tooth structure is replaced by a dentist just in readiness for the creation of a dental crown. This is done to create the foundation of the new restoration as well as the optimal shape.
A core can be directly created out of any form of total dental restorative.
The differences that exist between a dental core and a post & core are that with a post & core a dental post is put that assists to hold the core to the tooth.
It is also imperative to remember that a post and core can only be created for a tooth that has undergone root canal treatment in the past.
A dental core, on the other hand, can be made available for any tooth.
The materials that are commonly used in this process are the dental composite, which is the dental bonding used in making white fillings, or the dental amalgam, which is the metal used for creating silver fillings.
An enormous amount of the stability of the crown entirely relies on the extent of tooth structure that goes deep into its interior.
The crown can be dislodged easily if this space is filled with a little amount of tooth.
Using a core to build up a tooth is a great way of increase the crowns stability.
The tooth is rebuilt so it can get closer to its original dimensions. Once the stability of the crown is increased, the long-term chances for the survival of that tooth are maximized.
The Procedure For Post & Core System
While putting a post and a core, the dentists will first create a post space using their drill.
It is a space that will lie within one of the root canals filled in the process of sealing portion of the endodontic treatment of the tooth. The post is then bonded or cemented into that place.
The post should have specific dimensions that perfectly match to the space that has been drilled.
What follows next is a dental restorative that is packed around and over the exposed end of the post so as to make the core. This is done once the post has been secured. The core will be then anchored in place by the adjacent tooth structure and the post.
The Types Of Dental Posts
Back in the old times, posts were made out of stainless steel, cast metal, and titanium, but in the current marketplace, you can also find carbon fiber posts and ceramic.
There are basically two types of the post and core system; prefabricated post and cast post.
(A) Prefabricated Post
This type of posts usually takes less amount of time to put. This is because they do not require any form of laboratory work.
Therefore, they can be inserted once the decision to use them has been arrived at, and the post space made free off the gutta percha, having successfully completed the endodontic therapy.
A core material like a dental composite can be packed around the area of the prefabricated post. The material should be then cured and given an opportunity to set and form accurately into a crown preparation, an impression of a prosthetic crown can be then taken.
Fibre-reinforced composite resin post systems have lately superseded metal prefabricated post systems that have been in use for a very long time.
The fibre-reinforced composite resin post systems have been globally accepted since they provide enhanced resistance to tooth substrate fracture that is untreatable. One of these fractures is the vertical root fracture.
(B) Cast Post & Core
Cast post and core can be custom fabricated to the tooth in instances where the space of the post is not a perfect match for the prefabricated post.
A resin pattern is then made by putting a preformed burnout post (plastic in nature) to the resin material and the post.
Duralay resin, for example, is used to build up the tooth to the needed dimensions. When this process is completed, the pattern resin post is taken away from the tooth’s structure and attached to a sprue former.
This is done merely in the same way as is carried out with a crown’s wax pattern. Using a technique known as lost-wax, one unit of a cast post and core can then be fabricated out of titanium, gold, or any form of metal. Zirconia oxide-made custom post can be used to conceal areas where a metal post could not manage. Its color of the tooth will leave less of a shadow under the final restoration.
Similarly, an impression can be made of the post space and dental arch by utilizing polyvinyl siloxane and a plastic post impression material, which can use in the making of an excellent post in the dental lab.
How To Prepare For Dental Post & Core System
The timing of post placement as a result of the treatment of a root canal is very crucial for offering a coronal seal to the canal system of the root and maintaining an acute seal to the filling of the root.
To prevent unwanted root dentine’s weakening, post perforation and damage to the periodontium, a proper gutta-percha removal, and preparation of a good post space.
Post length is paramount in retaining the post retained crowns just within the limitations of curvature, root length as well as maintaining four to five millimeters of apical gutta-percha for an apical seal.
Another important preparation to this process is the coronal’s tooth tissue’s preservation, which is done to allow for the creation of ferrule, which will, in turn, reduce the risk of the fracture of the root.
Things That You Need To Avoid
Ceramic posts should be prevented, as they do not flex in the same manner as quartz fiber posts. The material used is also brittle, and its removal can be very hard during a fracture. You should also avoid multirooted posterior posts.
Other things that should be avoided are the threaded posts.