There is no single best dental crown material. The right choice depends on which tooth needs the crown, how much natural tooth structure remains, and how important appearance is to you. For front teeth, lithium disilicate (a pressed glass ceramic) is the most popular choice among dentists, selected 54% of the time. For back teeth, zirconia and porcelain-fused-to-metal crowns are nearly tied as the top picks, chosen about 32% and 31% of the time respectively.
Each material involves real trade-offs between strength, appearance, cost, and how it affects your surrounding teeth. Here’s what you need to know to have a productive conversation with your dentist.
Crown Materials at a Glance
Five main categories cover nearly every crown placed today:
- All-metal (gold or base metal alloys): Strongest and longest lasting, but metallic in appearance.
- Porcelain-fused-to-metal (PFM): A metal shell coated in tooth-colored porcelain. Proven track record but can develop a visible dark line at the gumline over time.
- Lithium disilicate: A glass ceramic that mimics natural tooth translucency. Strong enough for most situations, and the top choice for front teeth.
- Zirconia: An extremely tough ceramic available in different translucency levels. The leading choice for back teeth.
- Leucite-reinforced glass ceramic: The most translucent option, but only suitable for single front-tooth crowns due to lower strength.
Best Materials for Front Teeth
Front teeth don’t take heavy chewing forces, so appearance is the priority. Lithium disilicate dominates here because it lets light pass through in a way that closely matches natural enamel. It can be placed as a single piece without a separate porcelain coating on top, which eliminates the risk of that outer layer chipping off later.
Layered zirconia, where a strong zirconia core is covered in translucent porcelain, is the second most common choice at 17%. It offers more strength than lithium disilicate, which can matter if you grind your teeth. The trade-off is a slightly less natural appearance and a small risk of the porcelain layer chipping over the years.
If matching the exact shade and translucency of your neighboring teeth is critical, leucite-reinforced glass ceramic offers the most lifelike result. Dentists use it about 13% of the time for front teeth. It’s the most translucent material available, but its lower strength means it’s only appropriate for a single crown on a front tooth, not a bridge or a molar.
Best Materials for Back Teeth
Molars and premolars handle the heavy work of chewing, so strength matters more than aesthetics. All-zirconia crowns have become the most popular option here. They’re milled from a single block of zirconia with no porcelain coating to chip, and they combine high strength with reasonable appearance. Their cost tends to be lower than layered alternatives too.
PFM crowns remain a close second for back teeth, with decades of clinical data behind them. Studies have shown a 94% success rate over 10 years. Many experienced dentists still prefer them because the tooth preparation is straightforward and the results are predictable.
Full metal crowns, often gold alloy, are the strongest and longest-lasting option for back teeth. In a large study tracking crowns placed across England and Wales, metal crowns had the highest 10-year survival rate at 68%, compared to 48% for all-porcelain crowns. The obvious downside is that a gold or silver-colored molar is visible when you laugh or open your mouth wide. If that doesn’t bother you, metal remains what many dentists consider the gold standard for pure durability.
How Newer Zirconia Compares to Traditional
Zirconia isn’t just one material anymore. It comes in several generations, and understanding the difference helps you weigh your options. Traditional zirconia (called 3Y in dental terminology) is extremely strong, with flexural strength around 584 MPa, but it looks opaque and chalky. It works well hidden under a porcelain veneer layer or in spots where no one will see it.
High-translucency zirconia (5Y) was developed to solve the appearance problem. It lets 20 to 25% more light through, giving it a more tooth-like look. The catch is significant: it loses 40 to 50% of its strength compared to traditional zirconia, dropping to around 373 MPa. Its fracture toughness, which measures resistance to cracking, falls by roughly half.
That’s still strong enough for many situations, but it means high-translucency zirconia isn’t always the automatic upgrade it sounds like. For a molar that takes heavy forces, your dentist might recommend traditional zirconia with a porcelain overlay rather than the translucent version. For a premolar where both appearance and strength matter, high-translucency zirconia can be a good middle ground.
Wear on Your Other Teeth
One factor people rarely consider is how a crown material affects the teeth it bites against. Ceramics in general are harder than natural enamel, and some types are more abrasive than others.
Polished zirconia is one of the gentlest ceramics on opposing teeth. One simulation study found essentially no wear traces on enamel biting against zirconia. Lithium disilicate (specifically the pressed version) has also shown good wear compatibility over three-year follow-ups. The most abrasive culprit tends to be feldspathic porcelain, the type traditionally used to coat PFM crowns and some all-ceramic cores. If the surface of a porcelain crown becomes rough or loses its glaze, it can accelerate wear on the natural tooth it contacts.
Metal crowns produced the least tooth wear in some studies, though results vary depending on the specific alloy and the porcelain used in comparisons. The practical takeaway: if you’re concerned about protecting the tooth opposite your crown, polished zirconia or pressed lithium disilicate are solid choices.
How Much Tooth Gets Removed
Every crown requires your dentist to shave down the natural tooth to create space for the restoration. The amount varies by material, and less removal generally means more of your healthy tooth is preserved.
PFM crowns need the most reduction because the dentist has to make room for both a metal layer and a porcelain coating on top. That typically means removing 1.5 to 2 mm from the biting surface and about 1.2 mm from the visible face of the tooth. All-ceramic crowns (including zirconia and lithium disilicate) need less, usually 1 to 1.5 mm total, since there’s no metal substructure taking up space. Full metal crowns require the least preparation of all because metal can be made very thin while staying strong.
This matters most when a tooth is already weakened. If you’ve had a large filling or root canal and there isn’t much tooth left, preserving every fraction of a millimeter helps the crown grip the remaining structure.
Metal Allergies and Biocompatibility
Most crown materials are well tolerated, but metal-containing crowns can trigger reactions in sensitive people. Nickel allergy is the most common, affecting roughly 23% of people tested in one study of dental alloy patients. Women are significantly more likely to react to nickel and palladium than men. Reactions can include gum inflammation around the crown, and in rare cases, dermatitis on the face or ears.
If you have a known metal sensitivity or a history of reacting to costume jewelry, all-ceramic options like zirconia or lithium disilicate eliminate this risk entirely. Zirconia in particular is considered highly biocompatible, which is one reason it has overtaken PFM as the top choice for back teeth. Gold alloy crowns also have excellent biocompatibility and rarely cause allergic reactions, but base metal alloys containing nickel, cobalt, or chromium are the ones most likely to cause problems.
The Dark Line Problem With PFM Crowns
If you’ve ever noticed a grayish line at someone’s gumline near a crown, you’re seeing the metal edge of a PFM restoration. This happens because gums naturally recede with age, gradually exposing the metal margin that was originally hidden beneath the gum tissue. It isn’t decay or staining. It’s simply the metal showing through.
This process can take years or happen relatively quickly depending on your gum health and how the crown was placed. Over time, the bond between the metal and porcelain layers can also weaken, making the contrast more noticeable. For back teeth this is rarely a concern, but on front teeth or premolars visible when you smile, the dark line is the main reason PFM crowns have fallen out of favor in the aesthetic zone. All-ceramic crowns avoid this issue entirely since there’s no metal underneath.
Choosing Based on Your Situation
For a visible front tooth where appearance is the priority, lithium disilicate gives the best combination of natural looks and reliable strength. If you need an exact color match to neighboring teeth, leucite-reinforced glass ceramic offers superior translucency for a single crown.
For a molar that takes heavy chewing forces, full-contour zirconia provides the best balance of durability and acceptable appearance. If aesthetics on a back tooth don’t matter to you at all, a gold or metal alloy crown will likely outlast every other option. PFM remains a reasonable choice for back teeth, particularly if cost is a factor, though the trend is clearly moving toward all-ceramic alternatives.
For people who grind their teeth, zirconia or metal crowns handle the extra stress better than glass ceramics. For those with metal allergies, any all-ceramic material is the safest route. And if preserving as much natural tooth as possible is the goal, all-ceramic or metal crowns require less removal than PFM.