What is a post and core?
A post and core is a foundation for a crown on a root-treated tooth. A thin post is fixed into the cleaned root canal and a core of filling material is built around it to replace missing tooth; the crown then covers both. It is used only when too little tooth remains to hold the core alone. At Creative Arts in Dubai, the need for a post is judged after the root canal from X-rays and the remaining walls.
Who treats you here Dr. Marina Antoniuk Dentist · Dr. Julia General Dentist · Dr. Khalid Saeed Co-founder & Dentist
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What are the parts of a post and core, and what does each do?
A tooth restored after root canal treatment can have up to four layers, and it helps to know what each one is for:
- The root filling seals the cleaned canals. It is the result of the root canal treatment itself.
- The post is a thin rod, a few millimetres long, cemented or bonded into the upper part of one canal. Its only job is to anchor the core. It does not reinforce the root.
- The core is a build-up of filling material that rebuilds the missing part of the tooth above the gum, so that the crown has something of the right shape to sit on.
- The crown covers and protects everything underneath.
The most important part is not on that list: it is the collar of natural tooth left around the base of the core, which dentists call the ferrule. When the crown can wrap around at least a small band of sound tooth, biting forces pass through the tooth rather than levering the core and post. Teeth with a good ferrule tend to do better than teeth that rely on the post alone, which is why dentists save every bit of healthy tooth they can.
Does every root canal tooth need a post and core?
No. The decision depends on which tooth it is and how much of its crown is left after decay, old fillings and the access cavity are accounted for.
| Situation after the root canal | Usual restoration | Is a post likely? |
|---|---|---|
| Front tooth with only a small access hole and intact walls | A bonded filling; a crown only if the tooth is also weakened or discoloured | Usually not |
| Molar with most of its walls still standing | A core build-up anchored in the pulp chamber, then a crown | Usually not: the chamber gives retention |
| Premolar or front tooth that has lost about half of its crown | Core build-up and crown; a post if the remaining walls cannot hold the core | Sometimes |
| Tooth broken down close to the gum, with little crown left | Post and core, then a crown, if a ferrule can still be created | Often |
| No sound tooth above the gum, or a crack running into the root | Gum or orthodontic procedures may be discussed; otherwise extraction and replacement | A post alone would not make the tooth predictable |
A clinical examination and X-rays decide which row a tooth fits. Two teeth that look similar from the outside can need different plans.
Fibre post vs metal post: what is the difference?
Posts fall into two broad families. Fibre posts are made of glass or quartz fibres in resin. They are tooth-coloured, bonded into the canal with adhesive, and flex in a way closer to natural dentine. Metal posts are either ready-made, or cast as a single custom post-and-core from an impression or scan of the canal. They are stiffer and very strong in themselves.
Studies comparing the two have generally found broadly similar survival over time, so neither is right for every tooth. The difference that matters to patients is how they fail when they do. A rigid metal post can concentrate stress in the root, and its failures are more often root fractures, which usually mean losing the tooth. A fibre post is more likely to come unstuck, which can often be re-bonded or redone. Fibre posts also avoid a grey shadow under thin ceramic crowns or thin gum at the front of the mouth.
A custom metal post-and-core can still be the sensible choice for a canal with an unusual shape or a tooth carrying heavy forces. Your dentist chooses the type for that particular root and explains why.
Fibre post or metal post at a glance
General characteristics. The right choice depends on the root, the remaining tooth and the crown planned on top.
| Fibre post | Metal post (ready-made or cast) | |
|---|---|---|
| Colour | Tooth-coloured; no grey show-through | Metal; may need masking under thin ceramic |
| Stiffness | Flexes closer to dentine | Much stiffer than dentine |
| How it is fixed | Bonded with adhesive and resin cement | Cemented; a cast post is made in a dental lab to fit the canal |
| Typical way it fails | Debonding, often repairable | More often a root fracture |
| Removing it later | Usually easier to drill out if retreatment is needed | Can be difficult and carries some risk to the root |
These are general tendencies from the dental literature, not predictions for an individual tooth.
Can a post crack the root?
It can, which is why dentists do not place posts by default. Making space for a post removes some dentine from inside the root, and a post that is too wide, too long or too stiff can act like a wedge when you bite. A crack that runs down the length of the root, a vertical root fracture, usually cannot be repaired.
Good technique keeps that risk low: the post is no wider than the canal needs, a seal of root filling is left at the tip, the core and crown are designed so the bite lands evenly, and the crown grips a ferrule of natural tooth. Heavy grinding raises the risk for any restored tooth, so if you grind, a custom night guard is worth discussing.
Signs that a root may have cracked under a post include pain on biting that does not settle, a gum boil next to the tooth, or a crown that loosens repeatedly. Our guide to a root canal tooth that broke explains how these teeth are assessed and when they can still be saved.
How is a post and core placed?
Often in the visit that completes the root canal, or soon after, followed by the crown.
Check the root filling
An X-ray confirms that the root filling is sound and sealed. A post is not placed over a root canal that is failing; that would need root canal retreatment first.
BeforePrepare the post space
Part of the root filling is removed from the upper canal, leaving a seal at the tip. The tooth is usually numbed with local anaesthetic for comfort around the gum.
Visit 1Fit the post and build the core
The post is bonded or cemented, and the core is built up around it and shaped. A cast post is fitted at a later visit, once made.
Visit 1Prepare and scan for the crown
The tooth is shaped and scanned, and a temporary crown protects it. The crown is then made by Creative Art Dental Lab in the same building, typically in 3–5 working days depending on complexity.
Visit 1–2Fit the final crown
The bite is checked and adjusted before the crown is cemented. Our dental crowns page explains the material options.
Final visit
Need a root canal, or told your root-treated tooth needs a post? See how root canal treatment is planned at Creative Arts in Dubai, from diagnosis and microscope-assisted treatment to the final crown.
Explore root canal treatmentWhen is a post and core not the answer?
A post cannot create tooth that is not there. If decay or a fracture extends below the gum and bone, there may be nothing for the crown to grip, and the tooth becomes unpredictable however well the post is placed. In some of these cases a gum procedure to expose more tooth (see our guide to crown lengthening) or orthodontic extrusion is considered; whether either suits your tooth, and whether it is done here or by referral, is decided at an assessment.
Where the root is cracked, very short or weakened by infection, removing the tooth and replacing it can be the more reliable long-term plan. Our comparison of root canal or extraction sets out how that judgement is made. Either way, the restoration should follow the root canal promptly: in one retrospective study, root-treated teeth that were not crowned were lost at about six times the rate of crowned teeth (Aquilino and Caplan). Our guide to a crown after a root canal explains timing, and the honest downsides of crowns are covered in dental crown disadvantages.
If the crown comes off with the post inside it
Keep the crown and post together, rinse them gently and store them in a clean container. Do not glue them back in with household or pharmacy adhesive: a crown seated even slightly wrong can crack the root. Call the clinic during opening hours, daily 10:00–20:00, and avoid chewing on that side until the tooth has been checked.
Who restores root-treated teeth at Creative Arts?
Root canal treatment at Creative Arts is carried out by Dr. Marina Antoniuk and Dr. Julia, who both work with a dental microscope. Dr. Marina Antoniuk also restores teeth with posts, cores and crowns, together with Dr. Khalid Saeed, co-founder of the clinic. Before treatment you receive a written, itemised plan that explains whether a post is needed, the alternatives, and what happens if the tooth turns out not to be restorable.