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When most people say "porcelain crown", they mean the classic porcelain-fused-to-metal crown: a metal cap with porcelain baked over it. A zirconia crown has no metal at all. That one difference changes almost everything. Zirconia looks more like a real tooth, it's extremely strong, and it's safe for people who react to metal. So for most teeth today? Zirconia is the better crown — and below, we'll show you why, along with the couple of things worth knowing before you choose it.
Send us a photo of the tooth and tell us whether you clench or grind. We'll tell you which material makes sense — and why.
Ask about my crownA porcelain crown — or metal-ceramic crown, as dentists often call it — is built in two layers. Underneath sits a thin metal shell that fits over your tooth. On top, the lab bakes several coats of porcelain to give it a tooth colour. It has been the standard crown for decades, and plenty of people still have one or two in their mouth.
A zirconia crown is a different animal. It's milled from a single block of zirconium dioxide, a white ceramic, so there's no metal anywhere in it. You'll hear about two types: monolithic (one solid piece) and layered (a zirconia base with a thin porcelain finish on the front). Both are metal-free.
Because light can get into them. Metal can't do that.
Look closely at a natural tooth and you'll see it isn't one flat colour. Light travels into the enamel, scatters, and comes back out — which is why the tip of a front tooth looks slightly see-through and the part near the gum looks warmer and deeper. A porcelain crown has a metal shell in the middle, and that shell stops light dead. To hide the metal, the lab has to put an opaque layer over it first. The result often looks a bit flat or chalky next to your own teeth (you've probably seen a crown like that and spotted it straight away).
Then there's the gumline. Gums tend to recede a little over the years, and when they do, the metal edge of a porcelain crown can show as a thin dark-grey line. Not a great look on a front tooth.
Zirconia avoids both problems. It's white all the way through, so there's no dark edge to hide, and modern zirconia lets enough light through to look alive. Better still, we can build colour into it the way nature does: a slightly darker, warmer shade near the gum, fading to a lighter, more translucent tip — just like a real tooth. Once it's in, plenty of patients struggle to say which tooth is the crown.
One honest caveat. The most translucent zirconia grades get their glassy look from extra yttria, and the American Dental Association notes that this makes the material more brittle, with lower flexural strength. [1] So for a molar we choose a stronger grade, and for a front tooth a more translucent one. Want the full picture on front teeth? Read are zirconia crowns good for front teeth? — and for picking a shade, our teeth colour chart guide.
Very strong. In bending tests, conventional zirconia holds out at roughly 1,000 MPa or more — many times the strength of the feldspathic porcelain that's baked onto a metal crown.
That matters, because the weak point of a porcelain crown was never the metal. It's the porcelain on top, which can chip off under a heavy bite and leave a dark patch of metal showing. A large review of single crowns found that monolithic zirconia crowns had significantly fewer ceramic fractures and chips than crowns with a layered porcelain surface. [2] Solid zirconia, in other words, has nothing on the surface to flake away.
Over five years, they're neck and neck. A 2026 systematic review and meta-analysis of tooth-supported single crowns reported five-year survival rates of 97.1% for metal-ceramic (porcelain) crowns, 97.3% for layered zirconia and 96.8% for monolithic zirconia. [2] The authors concluded that zirconia crowns hold up just as well as the traditional metal-ceramic crown.
So zirconia gives you the looks and the metal-free benefits without giving up any durability. Fair trade. How long your crown actually lasts will come down to your bite, your oral hygiene and how well it was planned and fitted — not just the material.
Less with zirconia, as a rule.
A porcelain crown needs room for two layers: the metal shell and the porcelain over it. That usually means trimming more of your natural tooth. Monolithic zirconia is strong enough to be milled thinner, so the dentist can often keep more of the tooth — a real plus on molars, where every bit of healthy structure helps.
If your tooth is healthy and you're only after a cosmetic change, you may not need a crown at all. We compare the two in veneers vs crowns.
Porcelain crowns are made on metal alloys, and some of these contain nickel — one of the most common contact allergens. A small number of people react with gum irritation or inflammation around the crown. Zirconia contains no metal and is highly biocompatible, so it's the obvious choice if you've ever reacted to jewellery, watch straps or earrings, or simply want a mouth without metal in it.
Grinding (bruxism) puts any crown to the test. A porcelain crown's surface layer is the most likely to chip under that kind of force; solid zirconia is the least likely to crack.
But there's a flip side. A 2020 systematic review found that monolithic zirconia crowns gradually wear down the natural tooth biting against them — and that the opposing tooth loses more surface than the crown itself. [3] A smooth, highly polished zirconia surface is much gentler on that tooth than a rough one, so polishing after every bite adjustment is part of doing the job properly.
Our advice for grinders: a well-polished monolithic zirconia crown plus a night guard. Does your jaw ache or click as well? Our jaw joint disorders page covers that side of it.
Sometimes, yes — but less and less. A metal-ceramic crown has the longest track record in dentistry, and some dentists still use it for certain long bridges or when cost is the deciding factor. For a single crown on a front tooth, a back tooth or an implant, zirconia now does the job at least as well and looks better doing it. And if you have an old porcelain crown with a grey line at the gum, swapping it for zirconia is one of the simplest ways to freshen up a smile. Planning several crowns? Our zirconia crowns guide for UK patients walks you through the process in Antalya.
Tell Seçil Dental Clinic which teeth bother you and share a few photos. We'll suggest the right material for each tooth before you book your trip.
Plan my crownsBecause zirconia combines strength, a natural look and zero metal. It does not chip the way the porcelain layer of a metal-ceramic crown can, it never shows a grey line at the gum, and it is safe for people with metal allergies. Modern zirconia can also be shaded darker near the gum and lighter at the tip, like a natural tooth.
Possibly, but there is no long-term research that shows it yet. Modern zirconia crowns have only been in wide use for around two decades, and most studies follow them for five to ten years. Good hygiene, regular check-ups and a night guard if you grind give any crown the best chance of a long life.
A rough zirconia surface can wear down the natural tooth it bites against, so the crown must be well polished. The most translucent zirconia grades are also less strong than standard zirconia, which is why the material is chosen tooth by tooth. Zirconia crowns usually cost a little more than metal-ceramic ones.
For most people, a metal-free crown such as zirconia. It is highly biocompatible, avoids metal allergies, leaves no grey line at the gumline and usually needs less tooth removed than a metal-ceramic crown. If your tooth only needs a cosmetic change, a veneer may be healthier still.
Yes. If a metal-ceramic crown has chipped, looks grey at the gumline or no longer matches your other teeth, it can be removed and replaced with a zirconia crown. The dentist checks the tooth underneath first, and the new crown is shaded to blend with your natural teeth.
[1] American Dental Association — Materials for indirect restorations.
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