Crown or no crown is one decision. Porcelain or metal is another, and in some ways it’s the more complicated one. People assume it’s just about looks. It isn’t. The material affects how the crown performs, how long it lasts, and how it interacts with the surrounding teeth and gum tissue. Getting it right matters more than most patients realise.
The Core Difference
Metal crowns, whether full gold alloy or non-precious metal, are made entirely of a metallic material. They’re strong, they flex very slightly under load without fracturing, and they’re relatively conservative on the opposing tooth because metal wears at a similar rate to natural enamel. The obvious issue is that they’re visible as metal, which makes them unsuitable for most patients in visible positions.
Porcelain crowns (including the family of ceramic materials: emax, zirconia, traditional feldspathic porcelain) are tooth-coloured. Some are made entirely from ceramic. Others have a metal core with porcelain fired over the top (porcelain-fused-to-metal, or PFM). Each has its own set of tradeoffs. Not all porcelain is the same, and that matters when making the decision.
Strength: The Honest Comparison
Metal wins on raw toughness. Full metal crowns don’t fracture. They can dent or deform under extreme loads, but they won’t suddenly crack and require emergency replacement. For back teeth, particularly in patients with heavy biting forces or confirmed bruxism, this is a meaningful advantage.
Zirconia has closed the gap considerably. Modern high-strength zirconia is genuinely hard-wearing and very unlikely to fracture in normal use. That said, it’s harder than natural enamel, which means it can accelerate wear on the opposing tooth if the bite isn’t perfectly calibrated and adjusted. Some patients are fine with this. Others develop significant opposing tooth wear within a few years, particularly if they grind.
Traditional porcelain (used in standard PFM crowns, or as a pure ceramic) is the most aesthetically versatile but the most brittle. It won’t fracture from normal biting forces when it’s well-made and well-supported. But a hard knock, a sudden impact, or high lateral forces from grinding can chip or crack the porcelain layer. This happens more often on back teeth, and more often in patients who grind, which is a reasonably common combination.
Appearance: Where Porcelain Still Has the Edge
For front teeth, full ceramic (particularly lithium disilicate emax or high-translucency zirconia) is genuinely impressive when it’s done well. Light passes through the material in a way that mimics natural enamel, and a skilled ceramist can match the shade and character of adjacent teeth very closely. Some patients are surprised by how natural the result looks.
Metal crowns on visible teeth are a non-starter for most patients. Fair enough. Even PFM crowns have that metal margin issue, where a dark shadow or a visible line appears at the gumline, sometimes within a few years as the gum naturally recedes a little. On a back premolar that’s rarely visible, it’s not a problem. On an upper central incisor, it’s often unacceptable.
Worth knowing: even within porcelain, there’s considerable variation in how natural the result looks. A budget crown made in an overseas laboratory using a generic shade may look noticeably artificial in good light. A crown made by a skilled local ceramist with detailed shade mapping will look entirely different. The difference in cost may be a few hundred pounds. Whether that matters depends entirely on the patient and the tooth in question.
What About Teeth Opposite the Crown?
This is the question that rarely gets asked in the initial consultation but matters quite a bit long-term. Crowns affect the teeth they bite against.
Gold alloy is widely regarded as the most compatible material with opposing natural teeth. It wears at a similar rate to enamel, which means the opposing tooth doesn’t suffer accelerated wear. This is one of the reasons gold crowns on lower molars are still a sensible clinical choice for certain patients, even if the aesthetic isn’t what they’d choose.
Standard zirconia can be quite hard on opposing enamel, particularly monolithic zirconia. Some zirconia crowns are polished rather than glazed to reduce this effect, but it’s a factor worth discussing, especially if you have a natural tooth opposing the crown position.
Porcelain on a PFM (the outer layer, not the metal underneath) is generally reasonable with opposing teeth. It’s softer than zirconia and tends to cause less opposing wear in normal use. When porcelain fractures, though, the rough fractured edge can abrade the opposing tooth quickly if it’s not caught early.
The Grinding Question
Bruxism (tooth grinding) changes the material decision significantly. If you grind, your dentist needs to factor that in. Some patients know they grind because a partner has told them, or because they notice jaw soreness in the morning. Others have no idea: the wear pattern on their teeth is the only evidence.
For a confirmed grinder, the priority is durability under lateral forces. Metal or high-strength zirconia. A nightguard is also strongly recommended, regardless of what material is chosen, because no crown material (and no natural tooth) is designed to withstand the forces generated by sustained nocturnal grinding.
Fitted without a nightguard, even the best crown in the right material is under unnecessary stress. It’s not alarmist to say this. It’s just arithmetic.
Cost Differences in Practice
| Material | Typical Private Cost (Scotland) | Key Consideration |
|---|---|---|
| Full metal (gold alloy) | £450 to £700 | Gold price fluctuates; excellent longevity |
| Porcelain-fused-to-metal (PFM) | £400 to £600 | Risk of visible metal margin over time |
| Full porcelain / emax | £500 to £800 | Best aesthetics for front teeth |
| Zirconia | £550 to £850 | Versatile; can wear opposing teeth if not adjusted |
NHS crowns are available in Scotland for eligible patients, with adults 26 and over paying 80% of the treatment cost up to a maximum of £384 per course of treatment. For full details on NHS dental charges in Scotland, NHS Inform covers this clearly.
So Which Should You Choose?
Short answer: the one that suits your clinical situation, not the one with the highest price tag or the most appealing aesthetic.
Front tooth that’s visible when you smile? Full ceramic, almost certainly. Back molar on a heavy grinder who isn’t bothered about appearance? Metal or high-strength zirconia. Back premolar on someone who grinds moderately and wants a natural look? This is where the conversation gets more nuanced, and there genuinely isn’t a single correct answer. Some patients in that situation get zirconia and never have a problem. Others get it and find the opposing tooth deteriorating within a few years.
The right approach is an honest conversation with your dentist, where they tell you what they’re recommending and why, rather than just asking you whether you want the porcelain or the metal one. If the recommendation isn’t explained, it’s worth asking for the explanation.
What Happens if a Porcelain Crown Chips?
It depends on the size of the chip and where the crown is. Small chips at the edge of a porcelain crown, particularly on a back tooth, can sometimes be smoothed and polished without replacing the whole crown. It’s not ideal, but if the margin is still intact and the structural integrity isn’t compromised, it buys time. Not always a permanent solution, but a reasonable short-term one.
Larger chips are a different matter. If the fracture extends into the body of the crown, or if the rough edge is causing soft tissue irritation or accelerated wear on the opposing tooth, replacement is usually the better call. Bonding porcelain onto a crown with composite resin is possible in some situations, but in practice the repair doesn’t hold as well as the original material and tends to discolour over time. Some patients find this acceptable. Others don’t.
The more important question is why the chip happened. A single hard knock (biting an olive stone, walking into something) is just bad luck. Repeated chipping is a sign of something systemic: a bite that needs adjusting, a grinding habit that needs addressing, or a crown that was never the right material for that position. Fix the cause, not just the chip, or you’ll be back with the same problem in twelve months.
Talking to Your Dentist About the Decision
It’s worth going into the conversation with a bit of context. Know roughly which tooth is being crowned and whether it’s visible. Think about whether you grind, or whether anyone has mentioned that you do. And be honest about whether aesthetics matter to you for that particular tooth. Some patients are genuinely unbothered by a metal crown on a lower molar they can’t see. Others feel strongly about it. Both are fine, but the dentist needs to know.
Ask which material is being recommended and why. Ask how long it’s expected to last, what the failure modes are, and what happens if something goes wrong down the line. A good dentist won’t be put out by those questions. In fairness, most patients don’t ask them, which is why the conversation sometimes stays superficial. But it’s your tooth and your money, and you’re entitled to understand the reasoning behind what’s being proposed.
And if you’re told the material choice doesn’t really matter, or that it’s just down to preference, push back a little. It does matter. The right material for a heavily loaded back molar in a grinder is different from the right material for a front tooth on someone who doesn’t grind and cares a lot about the result. These aren’t interchangeable decisions.
We discuss material options openly and in plain language before any crown work is agreed. You’ll understand what’s being proposed and what the tradeoffs are. To find out more about dental crowns in Dreghorn, or to book a consultation, contact StormDental on 01294 218 733. No jargon, no pressure, no surprises.
