Special casesCrowns after root canal treatment, and crowns on implants
After a root canal. A root-filled back tooth has lost its nerve and usually a lot of its internal structure, so it is more likely to crack under chewing forces. A crown is normally advised soon after treatment. Front teeth with little missing structure do not always need one. Where very little tooth remains, a core build-up — occasionally with a post — gives the crown something to hold on to. See our root canal treatment guide.
On an implant. An implant crown is fixed to an abutment rather than to a tooth, either cemented or held with a small screw that allows it to be removed later for maintenance. Because an implant has no ligament to cushion it, the bite on the crown is checked carefully. The crown is usually fitted once the implant has integrated with the bone, typically after about three to six months.