Crown or filling: a quick guide
| Tooth | Usually needs | Why |
|---|---|---|
| Molar | Crown | Takes the heaviest chewing force; cusps can split |
| Premolar | Crown | Narrow, and prone to splitting once hollowed |
| Front tooth, little damage | Filling | Lower forces; the crown can be avoided |
| Front tooth, large fillings or broken | Crown | Too little tooth left to hold a filling |
| Tooth holding a bridge or denture | Crown | Extra load |
Why root-treated teeth need protecting
The decay that caused the problem, older fillings and the opening made for treatment together remove a lot of the tooth’s structure. A crown covers and holds the remaining walls so that biting forces don’t wedge them apart.
The research backs this up. A study following root-treated teeth for about ten years found that those not crowned after treatment were lost about six times as often as those that were crowned. A larger systematic review found that a crown after treatment was the factor most strongly linked to the tooth surviving.
What happens, step by step
- Root canal finished, with a temporary or permanent filling.
- Core build-up: the inside is filled to give the crown a solid base, with a post only if needed.
- Shaping and scan: the tooth is shaped, scanned or measured, and a temporary crown fitted.
- Final crown: checked for fit, bite and colour, then cemented.
Which crown material?
Material choice depends on the remaining tooth, bite, appearance and restoration design. Zirconia and lithium disilicate (E-max) are both ceramics, with different properties. See zirconia vs ceramic crowns.
At Petal Smiles
Dr. Adish Chaudhary provides root canal care. Prosthodontist Dr. Adish Chaudhary plans the crown, so both are done in the same clinic and on one plan. Your estimate shows the root canal, any post and the crown separately. See root canal treatment and dental crowns.
Questions patients ask us
Is a crown always necessary after a root canal?
Not always. Front teeth that were only slightly damaged can often be sealed with a filling. Molars and premolars, which take heavy chewing forces, usually need a crown.
How soon after a root canal should I get a crown?
Ideally within a few weeks. Until the crown is fitted, the temporary filling can leak and the tooth can crack, so avoid chewing hard food on it.
What happens if I don't get a crown after a root canal?
The tooth may be fine for a while, but it is more likely to crack, sometimes below the gum where it can't be saved. Bacteria can also leak back in past a temporary filling and re-infect the root canal.
How long does it take to get a crown after a root canal?
Usually two visits about a week apart. The tooth is shaped and scanned at the first, with a temporary crown, and the final crown is fitted at the second.
Can a crown be put on the same day as the root canal?
The tooth can be prepared for a crown at the same visit in some cases, but the permanent crown is made in a lab and fitted later.
Do I need a post as well?
Only if too little tooth is left to hold the crown. A post in one of the roots then supports a core, and the crown goes over it.
Sources
Aquilino and Caplan, crown placement and survival of endodontically treated teeth, J Prosthet Dent, 2002 ↗Ng et al., tooth survival after root canal treatment: systematic review, Int Endod J, 2010 ↗NHS: root canal treatment ↗Last updated 24 October 2026.