There is no single best material for every dental crown. The right choice depends on where the crown sits in your mouth, how much natural tooth structure remains, and whether appearance or durability matters more to you. The main contenders are zirconia, lithium disilicate (often sold as E.max), porcelain fused to metal (PFM), and gold alloy. Each has real trade-offs worth understanding before you sit in the chair.
Zirconia: The All-Around Performer
Zirconia has become the default recommendation for many dentists, and for good reason. It is the strongest all-ceramic option available, with flexural strength ranging from roughly 370 to 510 megapascals depending on thickness. In practical terms, that means it resists cracking under heavy chewing forces better than any other tooth-colored crown. A three-year randomized trial found zero fractures in monolithic zirconia crowns placed on back teeth, even in patients with sleep bruxism.
The main knock against zirconia is aesthetics. It is more opaque than natural tooth enamel, so it doesn’t let light pass through the way a real tooth does. Research comparing zirconia to lithium disilicate found that zirconia had significantly lower translucency values, which means it can look slightly flat or lifeless on a front tooth where people notice these things. For molars and premolars, though, this rarely matters. Zirconia is an excellent choice when you need strength and a reasonably natural appearance on any tooth that isn’t front and center in your smile.
Another advantage: monolithic zirconia crowns (carved from a single block rather than layered with porcelain on top) require less tooth removal during preparation. One clinical trial found that monolithic crowns needed only about 1 mm of reduction on the biting surface and a 0.6 mm shoulder at the gum line, compared to 2 mm and 1 mm respectively for layered ceramic crowns. Less drilling means more of your natural tooth is preserved, which generally improves the long-term outlook.
Lithium Disilicate: Best for Front Teeth
If your crown will be visible when you smile, lithium disilicate is typically the top choice. This glass-ceramic material has a translucency that closely mimics natural enamel, allowing light to pass through and reflect in a way that makes the crown nearly indistinguishable from the teeth around it. Studies confirm that lithium disilicate produces significantly higher translucency values than zirconia at equivalent thicknesses.
Lithium disilicate is not as strong as zirconia, but it holds up well enough for front teeth where biting forces are lower. A randomized clinical trial tracking both materials on posterior teeth found no fractures in either group after three years, suggesting that lithium disilicate can handle back-tooth duty too, at least in patients without severe grinding habits. Still, most clinicians reserve it for anterior teeth and premolars where its visual advantages shine, and opt for zirconia on molars that absorb heavier forces.
Porcelain Fused to Metal (PFM)
PFM crowns were the gold standard for decades. They pair a metal substructure for strength with a porcelain exterior for appearance. They still work well, but they come with compromises that newer materials avoid.
The most visible drawback is a dark line that can appear at the gum margin over time as gum tissue recedes and exposes the metal underneath. This is purely cosmetic, but it bothers many patients. PFM crowns also carry a risk of the porcelain layer chipping away from the metal base, a failure mode that doesn’t exist with monolithic (single-material) crowns.
On the durability front, a large UK observational study found that metal-ceramic crowns had a 62% survival rate at 10 years, compared to 68% for all-metal crowns and 48% for all-ceramic crowns. Keep in mind that the “all-ceramic” category in that study predates modern zirconia and lithium disilicate, so those older numbers don’t reflect current ceramic performance. PFM remains a solid, cost-effective option. Expect to pay somewhere in the range of $600 to $1,800 per tooth, which overlaps with the cost of most other crown types.
Gold Alloy: Maximum Durability
Gold crowns are the longest-lasting option available. They wear at a rate similar to natural tooth enamel, meaning they won’t grind down the opposing tooth the way harder ceramics can. Gold alloys also require the least amount of tooth removal because the metal can be cast very thin while remaining strong.
To be classified as a high-noble dental alloy, a crown must contain at least 75% noble metals, with a minimum of 65% being actual gold. The rest is typically platinum-group metals, copper, or silver. This composition makes gold crowns extremely biocompatible, which is a genuine advantage for anyone with metal sensitivities.
The obvious limitation is appearance. A gold crown is unmistakably metallic. For second molars or teeth that aren’t visible, this is irrelevant, and some patients actively prefer the look. For any tooth in the smile zone, gold is a non-starter for most people. Gold crowns also tend to sit at the higher end of the price spectrum due to the precious metal content, though exact pricing fluctuates with the commodities market.
Metal Allergies and Biocompatibility
If you have known metal sensitivities, your material choice narrows quickly. Nickel is the most common contact allergen worldwide, with sensitization rates reaching 14.3% of the population in the United States and even higher in some other countries. Women are 4 to 10 times more likely than men to be nickel-sensitive, largely due to early ear piercing. Some lower-cost metal crowns and PFM substructures use base-metal alloys containing nickel, which can trigger reactions in sensitized individuals.
All-ceramic options like zirconia and lithium disilicate eliminate this concern entirely since they contain no metal. High-noble gold alloys are also well tolerated because they contain no nickel. If you’ve ever had a rash from jewelry or a watch clasp, mention it to your dentist before agreeing to any crown with a metal component.
How Tooth Location Should Guide Your Choice
The simplest way to think about crown materials is to match them to the job they need to do. Front teeth (incisors and canines) are all about appearance and face relatively light biting forces. Lithium disilicate is the natural fit here. Back teeth (molars) absorb the bulk of your chewing force and are barely visible, making zirconia or gold the strongest options. Premolars sit in the middle, both functionally and visually, and either zirconia or lithium disilicate works well.
Grinding habits shift the equation. If you clench or grind at night, prioritize strength over translucency. Zirconia and gold handle sustained heavy forces better than thinner, more translucent ceramics. A nightguard worn over any crown will also extend its life regardless of material.
Single-Visit Crowns vs. Lab-Made Crowns
Many dental offices now offer same-day crowns milled chairside using CAD/CAM technology. These are typically zirconia or lithium disilicate blocks carved by an in-office machine while you wait. Research comparing chairside CAD/CAM crowns to lab-fabricated versions found that the chairside crowns actually matched the original tooth shape more closely, with lower average surface deviations. However, lab-made crowns still scored higher on aesthetic grading in one comparative study, particularly because a skilled ceramist can hand-layer porcelain for subtle color gradations that a milled block can’t replicate.
The practical trade-off is convenience versus cosmetic refinement. A same-day crown means one appointment instead of two, with no temporary crown and no second round of numbing. For a molar, that’s an easy win. For a highly visible front tooth, a lab-fabricated crown with custom shading and layering may deliver a noticeably better cosmetic result.
Choosing Based on Your Priorities
- Best aesthetics for front teeth: Lithium disilicate, due to its superior translucency and lifelike light transmission.
- Best strength for back teeth: Zirconia or gold alloy, both of which handle heavy chewing forces without fracturing.
- Most tooth-conserving preparation: Monolithic zirconia or gold, both of which can be made thinner than layered ceramics.
- Best for metal allergies: Any all-ceramic crown (zirconia or lithium disilicate), which contains zero metal.
- Longest track record for longevity: Gold alloy, which consistently shows the highest long-term survival rates in clinical data.