What are dental posts?
Dental posts are placed when the crown of the tooth is destroyed by 50 or more per cent.
Dental posts allow hundreds of thousands of people every year to get a possibility to restore badly damaged teeth and their biting and chewing functions. It means that their health and standard of life will improve as well because they will get an opportunity to keep to a balanced diet consuming fresh fruit and coarse food.
Dental posts include screw posts, fiberglass posts, carbon fiber posts, parapulpar posts, cast metal posts-and-cores.
Screw posts are fabricated from gold platinum palladium alloys, titanium and titanium alloys, stainless steel and brass.
Screw posts are divided into active and passive. Active screw posts are not only fixed in the root canal with cement but also are screwed into it because they have thread. Passive screw posts are fixed with cement only. Screw posts have become less popular lately, giving place to more state-of-the-art fiberglass posts.
Dentists were using active and passive metal posts before switching to fiberglass posts. In practice metal posts turned out to have some drawbacks in terms of interaction with the root canal such as metal corrosion, lack of solid connection at the places where metal, dentin and cement meet, unattractive appearance in front tooth restoration, difficulties with the screw removal from the root canal.
Fiberglass dental posts are fabricated from horizontal fiberglass dipped using a special industrial method into epoxy resin matrix, which comprises 36.6% of the whole post weight. Fiberglass acts as a reinforcing element and makes up 63.4% of the post's weight. Fiberglass is continuous and it has constant tension. They are located horizontally along the major axis. Fiberglass lateral structure secures an even distribution of the load on the tooth solid tissues. Unlike carbon fiber posts, they are translucent, which makes them a good option for the front teeth.
Carbon fiber posts
Carbon fiber posts are modern non-metal posts. They give the greatest strength to the final restorations thanks to their elasticity resembling dentin elasticity. In other words, using these posts, a dentist can create an integrated complex consisting of a post, core and root canal. The properties of these posts provide an even distribution of pressure in the dental root structure. This makes carbon fiber posts the most suitable posts to strengthen root canals of relatively cured teeth and to prevent root fracture.
Dental posts-and-cores are the posts fabricated individually in a shape that accurately replicates root canal shape. Dental post-and-core reconstructs the core of the destroyed tooth in full. Restoring the tooth root using a post-and-core will require only capping it with a crown. Dental post-and-core is a virtually exact replica of the root canal anatomy to fix the construction ideally.
In order to fabricate a post-and-core the dentist will take the root canal filling away and widen the root canal by 2/3 of its depth. The doctor then will take a tooth and root canal impression and model a post-and-core using ash-free plastic. After that the doctor will give the impression or a modeled post-and-core to the lab, which fabricated the post. In a few days the post-and-core fabricated in the laboratory is fixed using special cement. The next step is to place an individually fabricated dental crown on the post-and-core. If fabricated professionally, dental post-and-core construction is so precise that it is next to impossible to take it out from the root canal. Dental post-and-core can be fabricated from virtually any material: nickel and titanium alloy, silver, zirconium dioxide etc.