Retreatment: When an Old Root Canal Treatment Causes Problems
Even years later, inflammation can develop in a root-treated tooth. A retreatment can often save the tooth.
A root-treated tooth hurts again, the X-ray shows a dark spot at the root tip, or a small fistula has formed on the gum: these are signs that the earlier root canal treatment is not (or no longer) tight. Instead of removing the tooth straight away, a retreatment – a repeat root canal treatment – is often worthwhile.
In a retreatment, the old root filling is removed completely, and the canals are cleaned, disinfected and tightly filled again. Typical reasons for failure are missed canals, leaking fillings or crowns and canal sections that were not fully cleaned – under the operating microscope these can often be found and treated.
Why root canal treatment can fail
- Missed canal: upper molars in particular often have an additional, very fine canal.
- Canal not cleaned to the tip: because of curvatures or calcifications.
- Leaking crown or filling: over the years, bacteria seep in from above.
- Crack in the root: unfortunately often not treatable – we clarify this as well as possible in advance.
How a retreatment works
Procedure- DiagnosisX-ray, if necessary a 3D scan (CBCT): where is the problem, and is the tooth worth saving?
- Removing the old restorationcrown or filling, possibly posts.
- Removing the old root fillingwith special instruments, ultrasound and under high magnification.
- Locating and cleaningfinding additional canals, shaping and intensive disinfection.
- Interim dressingoften a medicated dressing left in the canals for a few weeks.
- New root filling and tight restorationfinally a well-sealed crown.
A retreatment is more demanding than a first treatment and takes time. In return, you keep your own tooth – and an implant remains the reserve option for later.
Do you have symptoms in a root-treated tooth? Book your appointment at the Zahnarztpraxis St. Peter – via online booking or by phone on 0911 554181. You will find us at Hainstraße 25, 90461 Nürnberg (tram 6/10 to Scharrerstraße, patient parking via Scharrerstraße).
Frequently asked questions
Can every tooth be retreated?
Not every tooth. With vertical root fractures, very little remaining tooth structure or advanced periodontitis, keeping the tooth often makes no sense. We will give you honest advice.
Would I notice a leaking root filling?
Not always. Many inflammations cause no pain and only show up on an X-ray – one reason for regular check-ups.
This article is a translation of our German guide and does not replace a personal examination and consultation. If you have symptoms, please see a dentist – for example at the Zahnarztpraxis St. Peter in Nuremberg.
