What D2915 means

D2915 covers re-cementing or re-bonding an indirectly fabricated or prefabricated post and core. "D" is dental, "29" is the other-restorative-services group, and "15" is this recement post-and-core procedure. A post and core is a restoration where a post is placed into a root-canal-treated tooth's canal (for retention) with a core built on it (to provide a foundation for a crown). Sometimes an existing post and core comes loose — the cement bond between the post and the canal fails, and the post and core debonds — but the post, core, and tooth are otherwise intact. In that case, rather than making a new post and core, the existing one can be re-cemented back into the canal. D2915 covers this re-cementing of a loose post and core.

So it's a procedure to reattach an existing, intact post and core that has come loose from the root canal, when the post/core and tooth are sound.

This is one of the recement codes: re-cement inlay/onlay (D2910), re-cement post and core (D2915, this one), and re-cement crown (D2920). Re-cementing a post and core is appropriate when the post and core are intact, fit well, and the tooth/root is sound; if there are problems (a damaged post/core, decay, a root issue), a new post and core or other treatment may be needed. Often, if a crown is over the post and core, the crown may need to be removed (or may have come off with the post and core) to re-cement. Coverage is under restorative benefits; recement is a low-cost procedure.

When it's typically used

D2915 is reported for re-cementing or re-bonding a cast or prefabricated post and core that has come loose but is otherwise intact — reattaching the existing post and core into the root canal of a sound tooth, rather than making a new one, when the post, core, and tooth are in good condition.

How much does D2915 cost?

Re-cementing a post and core is a low fee, often roughly 50 to 200 USD depending on region — a procedure of reattaching the existing post and core, much less than making a new one. It's an economical solution when a post and core comes loose but is intact and the tooth/root is sound.

Is D2915 covered by insurance?

Covered under restorative benefits at a low cost. Some plans have a frequency limitation or a waiting period after the original placement (a recently-placed post and core coming loose might be considered the original placement's responsibility). If a crown must be removed/replaced to re-cement, related procedures may apply. Coverage is generally straightforward given the low cost. Verifying any frequency limits helps.

When a post and core comes loose

A post and core can come loose, and understanding why and when clarifies this re-cement procedure.

A post and core is anchored into a root-canal-treated tooth's canal by cement (between the post and the canal walls). Like other cemented restorations, this bond can fail over time or due to various factors, causing the post and core to come loose. Reasons include: cement breakdown over time, weakening the bond; forces on the tooth/crown transmitted to the post, stressing the bond; a post that wasn't optimally fitted or cemented originally; or other factors. When the post and core comes loose (debonds from the canal), the crown over it (if present) usually comes loose too (since the crown sits on the core) — so often the crown and post-and-core come out together, or the crown is loose. The result is a loose post and core (and crown).

Re-cementing is appropriate when the post and core (and crown) are intact and the tooth/root is sound — the existing post and core can be re-cemented back into the canal. The conditions are similar to other recements: the post and core intact (not damaged), the tooth/root sound (no new decay, no root fracture or other problem), and the fit still good. If there are problems — a damaged post/core, decay, or importantly a root fracture (a serious problem that often means the tooth can't be saved) — re-cementing may not be appropriate, and new treatment (a new post and core, or addressing the tooth's problem, possibly extraction if the root is fractured) may be needed. The dentist examines the situation to determine whether re-cementing is appropriate. For patients, understanding when a post and core comes loose — due to cement breakdown or forces, usually bringing the crown loose too — and that re-cementing is appropriate when the post/core and tooth are sound clarifies this procedure. It reattaches a sound, intact post and core. The dentist determines whether re-cementing is appropriate or whether problems (like a root fracture) require other treatment. Understanding this helps patients see that a loose post and core can often be re-cemented when sound, while underlying problems may need new treatment, with the dentist assessing the situation.

The post and core and the crown

A post and core usually works with a crown, and understanding this relationship clarifies the re-cement situation.

In a typical restored root-canal-treated tooth with significant structure loss, there's a post and core plus a crown: the post anchors into the canal, the core (built on the post) provides a foundation, and the crown sits over the core (and remaining tooth) to restore and protect the tooth. So the post and core and the crown work together — the post and core is the foundation, the crown is the outer restoration. When a post and core comes loose, this affects the crown too: since the crown sits on the core, a loose post and core usually means the crown is also loose (often the crown and post-and-core come out together as a unit, or the crown is loose because its foundation is loose). So re-cementing a loose post and core often involves the crown as well.

The re-cement procedure for a post and core therefore typically involves: if the crown and post-and-core came out together, re-cementing the post and core into the canal and the crown onto the core (which might be re-cemented together or in steps); if the crown is still on but loose with the post and core, the crown might need to be removed to access and re-cement the post and core, then the crown re-cemented. So re-cementing a post and core often coordinates with re-cementing or managing the crown. The dentist handles the post and core and the crown together as needed to restore the tooth's restoration. For patients, understanding that a post and core usually works with a crown — and that a loose post and core usually involves the crown too — clarifies the re-cement situation. Re-cementing the post and core often involves re-cementing or managing the crown as well. The dentist handles both to restore the tooth's restoration. Understanding this relationship helps patients see that when their post and core (and likely crown) comes loose, the dentist re-cements the post and core (and crown) together to reattach the foundation and the outer restoration, restoring the tooth's full restoration when the components and tooth are sound, addressing the post and core and the crown as the connected restoration they are.

Assessing the tooth before re-cementing

Assessing the tooth is important before re-cementing a post and core, and understanding this clarifies why.

Before re-cementing a loose post and core, the dentist assesses the tooth and root to confirm re-cementing is appropriate and the tooth is worth re-restoring. This assessment is particularly important for a post-and-core tooth because these are root-canal-treated teeth that have lost significant structure, so they can have certain risks. Key things to assess: whether there's a root fracture — a serious concern, because the forces on a post can sometimes contribute to a root fracture, and a fractured root usually means the tooth can't be saved (so if the post and core came loose due to or alongside a root fracture, re-cementing wouldn't help, and extraction might be needed); whether there's decay — decay at the margins or under the restoration would need addressing (possibly a new restoration); whether the post, core, and crown are intact — confirming they can be reused; whether the canal and remaining tooth are sound — ensuring a good foundation for re-cementing; and the overall prognosis — whether the tooth is worth re-restoring.

This assessment ensures re-cementing is appropriate and will give a good result, rather than re-cementing onto a compromised tooth (which could fail or mask a serious problem like a fracture). If the assessment reveals a problem (especially a root fracture), the dentist addresses it appropriately (which might mean a new restoration, other treatment, or extraction) rather than simply re-cementing. If everything is sound, re-cementing proceeds. For patients, understanding that the dentist assesses the tooth (especially for a root fracture, decay, and the prognosis) before re-cementing a post and core clarifies why this step matters. It ensures re-cementing is appropriate and the tooth is sound, rather than re-cementing onto a problematic tooth. The dentist's assessment determines whether to re-cement or to address a problem. Understanding this helps patients see that re-cementing a post and core involves checking the tooth's condition first — particularly important given these teeth's risks (like root fracture) — to ensure re-cementing is the right course and will restore a sound tooth, with the dentist addressing any problems found rather than simply re-cementing onto a compromised tooth.

Re-cement vs new post and core

Re-cementing and making a new post and core are different responses, and understanding the choice clarifies the decision.

When a post and core comes loose, the options are re-cementing the existing one or making a new post and core (or other treatment). Re-cementing (D2915) is appropriate when the post and core are intact and the tooth/root is sound — it's simpler and more economical, reattaching the existing post and core. A new post and core (or other treatment) is needed when there are problems: a damaged post or core, decay requiring removal and a new foundation, or a root issue. Importantly, if there's a root fracture, neither re-cementing nor a new post and core would save the tooth — extraction might be needed. So the choice depends on the condition: sound post/core and tooth → re-cement (economical); problems → new post and core or other treatment (or extraction if the root is fractured).

The dentist examines the loose post and core and the tooth (as discussed) to make this determination. Re-cementing is preferred when feasible (simpler, cheaper), but only when the post/core and tooth are sound. A consideration is that if a post and core has come loose, the dentist evaluates why (to ensure re-cementing will last and there's no underlying problem like a developing fracture). If re-cementing is appropriate, it restores the tooth economically; if not, the appropriate alternative (new post and core, other treatment, or extraction) is pursued. For patients, understanding that re-cementing (for a sound, intact post and core and tooth) and making a new post and core (for problems) are the options clarifies the decision. Re-cementing is the economical choice when feasible; a new post and core or other treatment is needed when there are problems (and extraction if the root is fractured). The dentist examines the situation to recommend the appropriate course. Understanding the choice helps patients see why their loose post and core might be re-cemented (if sound) or replaced/otherwise treated (if problems), with the dentist determining the best response based on the condition of the post/core and the tooth, including checking for serious issues like root fracture that would change the course.

Frequently asked questions

What is the D2915 dental code?

It's re-cementing or re-bonding a cast or prefabricated post and core that has come loose — reattaching an existing, intact post and core into the root canal of a sound tooth, rather than making a new one. It reseats a loose post and core when the post, core, and tooth are sound.

What is a post and core?

A restoration where a post is placed into a root-canal-treated tooth's canal (for retention) with a core built on it (a foundation for a crown). It's used when the tooth has lost significant structure. A crown then sits over the core to restore the tooth.

Why does a post and core come loose?

Cement breakdown over time, forces on the tooth/crown stressing the bond, a less-than-ideal original cementation, or other factors. When it comes loose, the crown over it usually comes loose too (often together), since the crown sits on the core.

Why assess the tooth before re-cementing?

To check for a root fracture (a serious concern — a fractured root usually can't be saved), decay, and the prognosis, ensuring re-cementing is appropriate and the tooth is sound. Re-cementing onto a problematic tooth (or one with a fracture) wouldn't be a good solution.

How much does re-cementing a post and core cost?

Often around 50 to 200 USD, a low fee for reattaching the existing post and core, much less than making a new one. If a crown must also be managed/re-cemented, related procedures may apply.

Re-cement or make a new post and core?

Re-cement if the post and core are intact and the tooth/root is sound (economical). Make a new one (or other treatment) if there are problems like a damaged post, decay, or a root issue — and extraction if the root is fractured. The dentist examines the situation.

This page is an independent, plain-language explanation for general information only. It is not billing, coding, or clinical advice. For the official CDT descriptor and current-year wording, refer to the American Dental Association.