Crowns and fixed prosthetics: when does a tooth need a crown?

Many people hear the word "crown" and imagine a major decision. In reality, a crown is sometimes what saves a tooth from extraction, and understanding when and why makes the decision far simpler.

What is a crown?

A precisely fabricated cap, made in a dental lab, that is fixed over a prepared tooth to restore its shape, function and chewing strength and protect it from fracture. Common materials include porcelain-fused-to-metal, zirconia and E-MAX; the dentist chooses based on the tooth position, biting load and cosmetic needs.

When is a crown needed instead of a filling?

When a tooth has lost much of its structure: extensive decay, a large fracture, or after root canal treatment — treated teeth become more brittle under chewing forces. A filling alone may not hold, while a crown surrounds and protects the tooth. The rule is not "every root-treated tooth needs a crown"; the dentist judges from the remaining tooth structure.

And a missing tooth?

Options include a fixed bridge (supported by prepared neighbouring teeth), an implant (replaces the root without touching neighbours), or a removable denture. Each has advantages and limits; the choice depends on bone, neighbouring teeth and budget.

How does it go?

Usually two or more visits: examination, anaesthesia, tooth preparation and an impression (or digital scan) with a temporary crown, then trying in and cementing the final crown after checking shade and bite. For materials like E-MAX, the shade is selected before fabrication so the crown blends with your teeth.

Looking after your crown

The crown itself cannot decay, but the tooth under it and the gum around it can. Brushing twice daily, flossing (or special bridge floss) around the crown margins, and regular reviews are what determine its lifespan — well-made crowns with good care last many years.

Warning signs

Pain when biting on the crown, persistent sensitivity, a feeling it sits high, gum bleeding around it, or any looseness. Do not wait for it to fall off; early review saves the tooth underneath.