Types of Dental Crowns: Zirconia, E-max, PFM and Gold: Compared Neutrally

A cracked molar has a way of announcing itself at the worst possible moment, mid-bite, on something as harmless as a sesame seed. Then comes the appointment, the X-ray, and a question most people have never once considered: what would you like your new tooth to be made of?

It sounds like choosing countertops. In a way, it is. Zirconia is the engineered quartz of dentistry, dense, tough, nearly unbreakable in daily use. E-max is the polished marble: beautiful, light-catching, a little more particular about where it goes. Porcelain-fused-to-metal is the reliable laminate that has covered kitchens since the 1960s. And gold, the copper farmhouse sink, is the material many dentists quietly pick for their own mouths.

Marketing muddies this decision badly. So let’s set the sales pitches aside and compare all four on what the evidence actually shows: strength, longevity, appearance, and how kindly each one treats the teeth around it.

What is a dental crown actually made of?

A crown is a custom cap that covers the entire visible portion of a damaged tooth, restoring its shape, strength, and function after a large cavity, a fracture, or a root canal. According to Cleveland Clinic, crowns are among the most common dental restorations, and the material families available today break down into four broad groups.

Zirconia is a ceramic derived from zirconium dioxide, the same class of material used in hip replacements and some watch cases. E-max, technically a brand name that became everyday shorthand, the way “Kleenex” did for tissues, is a glass-ceramic called lithium disilicate. Porcelain-fused-to-metal, or PFM, layers tooth-colored porcelain over a thin metal substructure. And gold crowns are cast from a gold alloy blended with metals like palladium or platinum for hardness, since pure gold would be too soft to chew on.

Each family solves a slightly different problem. Ceramics chase natural appearance. Metals chase durability and precision fit. PFM was dentistry’s decades-long attempt to get both at once. Understanding that trade-off, beauty versus brawn, and where each material lands on the spectrum, is really the whole game. The rest of this article walks through each one honestly, including the weaknesses their marketing tends to skip.

Zirconia crowns: the strongest option, with caveats

If crowns held a strength contest, zirconia would win walking away. In laboratory bench testing, high-strength zirconia registers flexural strength values in the neighborhood of 900 to 1,200 megapascals, roughly double lithium disilicate and many times that of traditional porcelain. In practical terms, it is extraordinarily resistant to cracking and chipping, which is why it has become a default choice for molars, where chewing forces are highest.

Zirconia has two other quiet advantages. It can be milled to fit with slim margins, and it tolerates thinner walls than layered porcelain, so dentists can sometimes remove less healthy tooth structure to make room for it. It is also highly biocompatible and metal-free, a plus for people with nickel or other metal sensitivities.

Now the caveats. Early monolithic zirconia earned a reputation for looking opaque and chalky: a bathroom-tile white that didn’t quite pass for enamel. Newer translucent formulations look far better, but there is a trade: as translucency goes up, strength comes down. And zirconia’s hardness cuts both ways. A well-polished zirconia surface is gentle on the opposing tooth, but a rough or heavily adjusted one can act like fine sandpaper on the enamel it bites against. If your dentist adjusts the bite at delivery, re-polishing that surface matters more than most patients ever realize.

E-max crowns: why dentists reach for them on front teeth

Hold a natural front tooth up to a window and you’ll notice light doesn’t just bounce off it: it passes partway through, glowing faintly at the edges. That translucency is what makes real teeth look alive, and lithium disilicate mimics it better than any other crown material in wide use. This is the reason E-max dominates cosmetic dentistry for incisors and canines.

Strength-wise, it sits in the respectable middle: bench values typically around 400 to 500 megapascals. That is far stronger than the feldspathic porcelain of older all-ceramic crowns, and plenty for front teeth, which shear food rather than crush it. E-max also bonds chemically to tooth structure, which can add retention and allow more conservative preparations in some cases.

Where it gets debatable is the back of the mouth. On molars, especially second molars, where bite forces peak, lithium disilicate fractures more often than zirconia, particularly in people who clench or grind. Many dentists still place it on premolars and first molars successfully, and published survival data for E-max is genuinely good over five to ten years. But if a dentist steers a heavy grinder away from E-max on a back tooth, that isn’t upselling; it’s the evidence talking. Think of it as the material you choose when the tooth will be seen more than it will be stressed.

Are PFM crowns outdated, or just underrated?

Porcelain-fused-to-metal is the crown your parents probably have, and dismissing it as obsolete is a little unfair. PFM has more than half a century of published track record, longer than zirconia and E-max combined, and long-term studies consistently show solid survival across ten years and beyond. When someone asks which crown is the most “proven,” PFM has the deepest evidence file in the drawer.

The design is a hybrid: a metal coping for strength and seal, veneered with porcelain for a tooth-colored finish. That hybrid nature produces its two well-known flaws. First, the porcelain layer can chip away from the metal beneath, especially under grinding forces: the metal survives, but the pretty surface doesn’t. Second, the metal blocks light. PFM crowns tend to look slightly flatter and more opaque than all-ceramic ones, and if the gumline recedes over the years, a thin gray line of metal can peek out at the margin. It’s purely cosmetic, not a health problem, but it bothers people on front teeth.

Where PFM still earns its keep: long bridges, teeth with limited room, situations where a metal substructure’s fit and rigidity genuinely help, and budgets or lab situations where it remains the practical option. Outdated? Not quite. It’s more like a dependable sedan in a showroom full of newer models, less exciting, still entirely roadworthy.

Gold crowns: the quiet favorite among many dentists

Ask a room of dentists what they’d want on their own second molar, and you’ll hear “gold” more often than any patient would guess. There are concrete reasons behind that preference, and they have nothing to do with nostalgia.

Gold alloy wears at a rate close to natural enamel, a property no ceramic fully matches, so it is exceptionally kind to the tooth it bites against. It is slightly malleable, which lets its margins burnish snugly against the tooth and helps it absorb chewing forces rather than transmitting them. It requires the least tooth removal of any full-coverage crown, because it stays strong even in thin sections; every millimeter of your own tooth that survives the drill is a long-term win. And it essentially does not fracture. Case reports and long-term clinical series describe gold crowns functioning for thirty and forty years, which no other material can claim with the same consistency.

The obvious drawback is the obvious drawback: it’s gold-colored. For most people that rules out visible teeth, which is why gold today lives almost exclusively on second molars, where hardly anyone will ever see it. Cost is the other consideration: the crown’s price tracks precious-metal markets, and gold alloys aren’t cheap. But judged purely on engineering and longevity, gold remains, pound for pound, the most durable crown dentistry has ever made.

Zirconia vs. E-max vs. PFM vs. gold: how they compare side by side

Every material here can serve a patient well for a decade or more: the differences are about fit for purpose, not good versus bad. Here is the honest scorecard, drawn from laboratory strength testing and long-term clinical reporting:

Material	Strength (bench testing)	Natural appearance	Tooth removal needed	Best-known weakness
Zirconia	Highest (~900–1,200 MPa full-strength)	Good, improving with translucent types	Low to moderate	Can wear opposing enamel if left rough
E-max (lithium disilicate)	Moderate (~400–500 MPa)	Excellent, best light handling	Moderate	Fracture risk on molars in heavy grinders
PFM	Strong metal core; porcelain layer weaker	Good, slightly opaque	Highest	Porcelain chipping; gray gumline over time
Gold alloy	Effectively fracture-proof in normal use	None (metal-colored)	Lowest	Appearance; precious-metal cost

Read the table with one caution: megapascal numbers come from controlled laboratory conditions, and mouths are messier than labs. Moisture, temperature swings, bite quirks, and hygiene all shape real-world survival more than a spec sheet does. Still, the pattern the numbers suggest, zirconia and gold for force, E-max for looks, PFM for proven versatility, matches what long-term clinical studies keep finding.

What kind of crown lasts the longest?

Gold holds the longevity record. Clinical literature includes gold crowns still functioning after several decades, and its failure mode is telling: gold crowns rarely break, when they fail, it’s usually because decay crept in at the margin or the tooth beneath developed a new problem. The crown outlives its circumstances.

Zirconia is the strongest challenger, but here honesty requires humility about the evidence. Monolithic zirconia crowns only became widespread in the 2010s, so forty-year data simply doesn’t exist yet. What we have, five- to ten-year clinical studies, shows excellent survival, frequently above 95 percent, with very few fractures. The trajectory looks promising; the long-term chapters are still being written.

For general expectations, Cleveland Clinic puts the typical crown lifespan at five to fifteen years, and that range holds across materials. Which points to something the marketing brochures underplay: the biggest predictor of how long your crown lasts isn’t in the lab, it’s in your bathroom and your bite. A meticulously cleaned PFM in a gentle bite will outlast a neglected zirconia crown in a grinder’s mouth, every time. Crowns don’t decay, but the tooth margin under them can, and gum disease undermines even a flawless restoration. Material buys you a head start. Habits decide the race.

Which dental crown is the most expensive?

Gold usually tops the invoice, for a reason you can watch on the commodities news: the crown contains actual precious metal, and the lab bills for it by weight at market rates. When gold prices climb, so do gold crown fees. All-ceramic crowns, zirconia and E-max, generally occupy the next tier, with pricing driven less by raw material than by laboratory artistry; a hand-layered, custom-shaded front-tooth crown costs more to make than a milled monolithic molar crown, even from the identical block of ceramic. PFM typically lands in the middle or lower-middle, partly depending on which metal alloy sits under the porcelain.

Exact figures vary enormously by region, laboratory, the complexity of your case, and insurance coverage, so treat any single number you find online with suspicion. In the UK, the NHS places crowns within a fixed treatment band, which flattens these differences considerably; in the US, prices for the same material can vary severalfold between cities.

One financial reframe worth doing: divide cost by expected years of service. A pricier crown that lasts twenty-five years can be a better value than a cheaper one replaced twice in the same span, and every replacement means removing a bit more of your natural tooth. Cheapest today is not always cheapest over a lifetime. Ask your dentist to walk you through both timelines before deciding.

What type of dental crown is the healthiest?

“Healthiest” is a word that gets stretched in dental marketing, so let’s define it by evidence: biocompatibility, kindness to neighboring tissue, and how much natural tooth must be sacrificed.

On biocompatibility, zirconia and E-max score high. Both are metal-free ceramics with very low rates of tissue reaction, which makes them the clear choice for anyone with a documented metal allergy. Nickel sensitivity is the relevant one here: it’s relatively common, and some non-precious PFM alloys contain nickel. If you’ve ever reacted to costume jewelry, mention it before a PFM is prescribed; high-noble alloys without nickel exist, but your dentist needs to know to specify them.

On tooth conservation, gold quietly wins. It requires the least drilling of any full-coverage crown, and preserving your own tooth structure is one of the most genuinely “healthy” things a restoration can do. Gold alloys also have a long biocompatibility record, with true gold allergy being rare.

On gum health, the honest answer is that margin quality and your flossing matter far more than material. A smooth, well-fitted margin of any material stays friendly to gum tissue; a rough or open margin of any material collects plaque. And to close a persistent internet myth: no mainstream evidence shows that any standard crown material causes systemic illness. The healthiest crown is a well-made one on a well-cleaned tooth.

Which crown looks the most natural?

E-max, and it isn’t especially close, at least not yet. The reason is physics rather than fashion. Natural enamel is semi-translucent: light enters the tooth, scatters through it, and exits with a subtle inner glow. Lithium disilicate reproduces that optical behavior more faithfully than any other mainstream crown material, which is why cosmetic dentists reach for it when a single front crown has to sit beside natural teeth and fool everyone, including the patient.

Zirconia is closing the gap quickly. Modern multilayer translucent zirconia, with color graded from gumline to biting edge the way real teeth are, can look genuinely convincing: a dramatic leap from the opaque white blocks of a decade ago. The engineering trade-off remains, though: the prettier, more translucent zirconia formulations give up a meaningful share of the strength that made zirconia famous. You can have maximum strength or maximum beauty from zirconia, but not both in the same crown.

PFM sits third. Skilled ceramists produce lovely PFM work, but the metal core blocks light transmission, lending a slight flatness that trained eyes catch, and the potential gray margin at a receding gumline is its lasting cosmetic liability. One practical note that outweighs all of this: the shade match your dentist and lab achieve matters more than the material category. A perfectly shaded PFM beats a poorly shaded E-max, every single time someone smiles at you.

Front tooth or molar? Location changes the answer

Here is the single most useful simplification in this entire article: the “best” crown is mostly a question of real estate. Your mouth is not one environment but several, and the forces involved change dramatically from front to back.

Front teeth, incisors and canines, are display teeth. They slice rather than crush, experience comparatively modest forces, and sit in full view every time you speak. Esthetics dominates the decision, which is why E-max and high-translucency zirconia own this territory, and why gold never appears here.

Molars are the opposite case. Chewing forces at the back of the mouth are substantial, bite-force studies commonly measure loads at the molars several times higher than at the incisors, often in the range of 100 to 250 pounds of force in healthy adults. Second molars, tucked behind your smile line, are seen by almost no one. Strength dominates: full-strength zirconia and gold are the evidence-backed picks, and the cosmetic penalty for choosing gold is essentially zero.

Premolars split the difference, visible in a wide smile, but working harder than incisors. E-max, translucent zirconia, and PFM all perform reasonably here, and this is the zone where your grinding habits and cosmetic priorities should genuinely tip the scale. When a dentist recommends different materials for different teeth in the same mouth, that isn’t inconsistency. It’s good judgment.

If you grind your teeth, read this first

Bruxism, clenching or grinding, often during sleep, changes the crown conversation more than any other single factor. Mayo Clinic notes that many people grind without knowing it; the giveaways are morning jaw soreness, dull headaches near the temples, teeth that look flattened or chipped, or a bed partner who hears the grinding at night. Since sleep grinding can generate forces well beyond normal chewing, a crown chosen for an average bite may be entering a much harsher world than anyone planned for.

For grinders, the evidence-based hierarchy shifts hard toward the fracture-resistant end. Full-strength monolithic zirconia and gold handle bruxism best. Gold has an extra virtue here: its slight give absorbs some of the load, and it wears sympathetically rather than shattering. E-max on molars becomes a riskier bet, lithium disilicate fracture rates climb in heavy grinders, and PFM’s porcelain veneer is exactly the layer grinding likes to chip away.

Two practical points follow. First, tell your dentist about grinding symptoms before the crown is made, because the diagnosis changes the prescription. Second, expect a conversation about a custom night guard. It’s not an upsell; it is protective equipment for an investment measured in four figures, and it shields your natural teeth in the bargain. A grinder’s crown without a night guard is a bit like a new windshield in a hailstorm.

How to make any crown last past the ten-year mark

Here’s the paradox of crown care: the crown itself cannot decay, yet decay remains one of the leading reasons crowns fail. The vulnerable spot is the margin: the microscopic seam where crown meets tooth, usually right at the gumline. Plaque that lingers there feeds bacteria that tunnel under the crown, and once decay starts beneath it, the restoration usually has to come off. MedlinePlus’s core adult dental-care advice applies doubly to crowned teeth: brush twice daily with fluoride toothpaste, clean between teeth once a day, and keep regular checkups so small margin problems are caught while they’re still small.

Beyond hygiene, a few habits punch above their weight:

• Floss with a pull-through motion at the crown rather than snapping the floss upward, which can stress margins over years of repetition.
• Retire your teeth from their second job as tools. Ice-crunching, popcorn kernels, and opening packages are classic ceramic-crackers.
• Wear the night guard if one was prescribed, consistently, not occasionally.
• Report a “high” bite promptly. A crown that hits first when you close concentrates force on one spot; the adjustment takes minutes and prevents fractures.

Cleveland Clinic’s five-to-fifteen-year lifespan estimate is an average, and averages contain both the neglected crowns and the pampered ones. Which side of that average you land on is largely a daily, two-minute decision.

When to see a dentist, about a crown, or a tooth that may need one

Some crown problems whisper before they shout, and the whisper stage is far cheaper to fix. Make an appointment promptly, not eventually, if you notice any of the following: a crown that feels loose, wiggles, or rocks when you chew; persistent pain or throbbing in a crowned tooth; new sensitivity to hot or cold that lingers rather than fading in seconds; a visible chip or crack in the crown; a dark line, gap, or catch-point at the gumline where your floss suddenly shreds; swollen, tender, or bleeding gums around the crown; or a bad taste or odor localized to that tooth, which can signal leakage underneath.

If a crown comes off entirely, keep it, avoid chewing on that side, and call the same day: the exposed tooth underneath is soft, sensitive, and vulnerable, and prompt recementation is often possible if you act quickly. Seek urgent care for facial swelling, fever with tooth pain, or swelling that affects swallowing or breathing; these can indicate a spreading infection that needs immediate attention.

And if you don’t have a crown yet but are nursing a cracked, heavily filled, or newly sensitive tooth, don’t wait for it to break on its own schedule. A tooth crowned before it fractures below the gumline is a routine procedure; one that splits deep can become an extraction. Timing, in restorative dentistry, is half the outcome.

Questions worth asking at your crown appointment

The best crown decisions happen in a two-way conversation, and dentists generally welcome patients who ask sharp questions. A few that earn their place:

• “Which material would you choose for this specific tooth, and why?” The answer should reference the tooth’s location and your bite, not a one-size-fits-all favorite.
• “How much of my natural tooth will you need to remove for each option?” Conservation matters for the tooth’s long-term prognosis.
• “Do you see signs of grinding in my mouth?” Wear facets are visible to a trained eye even if you’ve never noticed symptoms.
• “If this is a PFM, does the alloy contain nickel?” Essential if you’ve ever reacted to jewelry.
• “Will the zirconia be polished after any bite adjustment?” A small technical question that protects the opposing tooth for years.
• “What’s the plan if this crown chips or comes loose, and is there any warranty period?”

Notice what’s not on the list: “What’s the best crown?” asked in a vacuum. By now you know why: the honest answer always begins with “it depends,” and the dependencies are yours: your tooth, your bite, your smile line, your priorities. A dentist who explains trade-offs rather than declaring one material universally superior is practicing exactly the kind of evidence-based dentistry this comparison has tried to model. Walk in informed, ask about the trade-offs, and the material choice usually becomes surprisingly obvious.

Frequently asked questions

What is the best type of dental crown to get?

There is no single best crown: the right material depends on the tooth’s location, your bite, and your priorities. Evidence generally favors full-strength zirconia or gold for molars, where forces are highest, and E-max or translucent zirconia for front teeth, where appearance matters most. PFM remains a proven all-rounder. A dentist who examines your bite and grinding habits can match the material to the actual job.

Which dental crown is the most expensive?

Gold crowns are usually the most expensive because they contain actual precious metal priced at market rates. All-ceramic crowns like zirconia and E-max typically come next, with hand-layered cosmetic work costing more than milled crowns. PFM generally lands in the middle or below. Prices vary widely by region, laboratory, and insurance, so comparing cost per expected year of service is more useful than comparing sticker prices alone.

What kind of crown lasts the longest?

Gold has the longest documented track record, with clinical reports of crowns functioning for thirty to forty years; it essentially does not fracture. Zirconia shows excellent survival in five- to ten-year studies, but the material is too new to have multi-decade data. For any material, Cleveland Clinic’s typical estimate is 5 to 15 years, and daily hygiene at the crown’s gumline margin influences longevity more than the material itself.

What type of dental crown is the healthiest?

By biocompatibility, zirconia and E-max score highest, both are metal-free ceramics with very low tissue-reaction rates, ideal for anyone with nickel or other metal allergies. By tooth conservation, gold wins, since it requires the least drilling of healthy tooth structure. No mainstream evidence links any standard crown material to systemic illness. Practically, the healthiest crown is a well-fitted one over a tooth you clean thoroughly every day.

Can a crowned tooth still get a cavity?

Yes. The crown itself cannot decay, but the natural tooth at its margin, the seam near the gumline, can, and margin decay is a leading cause of crown failure. Once bacteria tunnel beneath a crown, it usually must be removed and remade. Daily brushing with fluoride toothpaste, careful flossing at the crown edge, and regular checkups are what protect that vulnerable seam.

Do zirconia crowns wear down the opposing teeth?

Well-polished zirconia is actually gentle on opposing enamel, in wear studies, often gentler than conventional porcelain. The problem arises when a zirconia surface is left rough, typically after a bite adjustment, because the rough hardness can abrade the tooth it bites against. If your dentist adjusts a zirconia crown at delivery, re-polishing that surface is a quick step worth confirming.

Are same-day milled ceramic crowns as good as lab-made ones?

For many single-tooth situations, yes, clinical studies of chairside milled ceramic crowns show survival rates comparable to lab-fabricated ones over five to ten years. The trade-offs are esthetic: a laboratory ceramist can hand-layer and custom-shade a crown more precisely, which matters most on highly visible front teeth. For molars and premolars, a well-made same-day crown is a legitimate, evidence-supported option that spares you a second visit.

I'm allergic to metals, which crown is safe for me?

Zirconia and E-max are the standard choices, since both are entirely metal-free ceramics with excellent biocompatibility. The most common concern is nickel, which appears in some non-precious PFM alloys; high-noble PFM alloys without nickel also exist. True allergy to gold alloys is rare but reported. Tell your dentist about any reaction you’ve had to jewelry or metal watch backs before the crown material is chosen.

How long does it take to get used to a new crown?

Most people adapt within a few days to two weeks; mild sensitivity to temperature or pressure early on is common and usually fades. What should not persist: a bite that feels high when you close, pain when chewing, or sensitivity that worsens rather than improves. Those signs warrant a quick return visit: a bite adjustment takes minutes and prevents bigger problems, so don’t simply endure an off-feeling crown.

Will a gold or PFM crown cause problems in an MRI scan?

Dental crowns are generally safe in MRI machines. Gold and the alloys used in crowns are not ferromagnetic, and ceramic crowns contain no metal at all, so crowns won’t be pulled or heated by the magnet. Metal restorations can occasionally distort images of the immediate head and neck area. Always tell the MRI technologist about any dental work beforehand: that’s standard screening, not cause for worry.

References

• Cleveland Clinic: Dental Crowns
• MedlinePlus: Dental Health
• MedlinePlus: Dental Care: Adult

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.