Dental Crowns Types: Materials, Strength and How to Choose

Dental crowns come in five main families: metal, porcelain-fused-to-metal (PFM), pressed ceramic, all-ceramic (including zirconia and lithium disilicate, known as E.max), and resin. The right one depends on where the tooth sits, how hard you bite, how much natural tooth is left and how natural you want the result to look. This guide compares each type on strength, appearance and typical use, answers the E.max versus zirconia question, and explains what usually suits a molar.

TL;DR

• Metal crowns are the toughest and need the least tooth removal, but they look metallic. All-ceramic crowns look the most like enamel.
• Zirconia is the stronger of the two popular ceramics. E.max is more translucent and bonds well to the tooth, so it often suits front teeth.
• For molars, dentists most often recommend monolithic zirconia, though the final choice depends on your bite and the tooth.
• Crowns last roughly five to 15 years with good care, and hygiene and check-ups matter as much as the material.
• Your dentist should choose the material after examining the tooth, not before.

Table of Contents

• What a crown does and when you need one
• The main types of dental crowns
• E.max or zirconia: which crown is better?
• Metal versus ceramic crowns
• Best crown material for molars
• How a crown is fitted
• How long crowns last and how to care for them
• Our perspective
• Planning a crown in Dubai
• Crowns and dental insurance in the UAE
• FAQ
• Sources

What a crown does and when you need one

A crown is a cap that fits over a tooth and restores its shape, strength and appearance. Dentists use crowns on teeth that are heavily filled, cracked, worn, weakened after root canal treatment, or badly shaped or discoloured. The material you choose changes how the crown looks, how long it tends to last and how much of your own tooth has to be shaped to make room for it.

If you are still working out whether you need a crown at all, a routine dental examination is the practical first step. A dentist can check how much sound tooth remains, look at your bite and the neighbouring teeth, and tell you whether a filling, a crown or something else is the better repair.

The main types of dental crowns

Dental references group crowns by material. Cleveland Clinic lists metal crowns (gold, palladium, nickel or chromium), PFM crowns, pressed ceramic, all-ceramic or porcelain crowns (zirconia among them) and resin crowns. Here is how they compare in everyday terms.

Metal crowns

Metal crowns are durable, rarely chip or break, and need little enamel removed, according to Cleveland Clinic. The trade-off is the metallic look. That is why they are usually kept for back teeth where few people will see them, and for patients who prioritise longevity over appearance.

You may read online worries about metal toxicity. The American Dental Association notes that the decline in metal-ceramic crowns has been driven not only by aesthetics but by internet-fuelled public concern. If you have a known metal allergy, tell your dentist before any alloy is chosen.

Porcelain-fused-to-metal (PFM) crowns

A PFM crown has a metal base for strength and a porcelain layer for colour. The ADA describes metal-ceramic crowns as combining metal strength and durability with a porcelain appearance. Cleveland Clinic adds that PFM crowns can chip and can wear down the enamel of the opposing tooth. A thin dark line near the gum can also show over time, which is one reason many patients now prefer all-ceramic options for visible teeth.

Pressed ceramic and all-ceramic crowns

All-ceramic or porcelain crowns mimic tooth enamel most closely, as Cleveland Clinic notes. Within this family, two materials dominate modern practice: zirconia and lithium disilicate (E.max). They behave differently, so they deserve their own section.

Resin crowns

Resin crowns are tooth-coloured and appear in the same Cleveland Clinic list of crown materials. Ask your dentist honestly how long a resin crown is expected to serve in your particular tooth, because material choice and bite forces decide that more than any general rule.

E.max or zirconia: which crown is better?

Neither is better in every case. They are different tools.

Zirconia is a high-strength polycrystalline ceramic. E.max is a glass-ceramic with greater translucency. A 2019 narrative review reports flexural strength of 500 to 1200 MPa for zirconia against 300 to 400 MPa for lithium disilicate, while lithium disilicate offers better adhesive bonding to tooth structure because of its glass matrix.

A 2024 laboratory study found both materials clinically acceptable, with monolithic zirconia showing superior fracture resistance, at average values above premolar biting force.

On the other side, a six-year clinical study describes IPS e.max CAD as one of the most commonly used glass-ceramics for single crowns. Its translucency and the fact that it can be milled as thin as 1 mm suit cases with limited space and minimally invasive preparation, which helps preserve natural tooth.

In short, if appearance at the front of your smile is the priority, E.max is often the first discussion. If a heavy-biting molar or a clenching habit is the concern, zirconia usually leads.

Metal versus ceramic crowns

This is the choice many patients are really weighing. Metal gives you durability and conservative preparation. Ceramic gives you a natural look and avoids the metallic shade. PFM sits in the middle, with the chipping and opposing-wear caveats above.

A few questions help settle it:

1. Is the tooth visible when you smile or talk? If yes, lean to ceramic.
2. Do you grind or clench? Tell your dentist. Grinding raises the case for stronger materials and sometimes a night guard.
3. How much tooth remains? Very little height may change which materials are viable.
4. Do you have a metal sensitivity? If so, avoid alloys and discuss ceramics.

Because zirconia and E.max now give strong tooth-coloured results, many patients who once needed metal for strength can choose ceramic instead.

Best crown material for molars

Molars take the heaviest chewing forces, so strength carries more weight here than on a front tooth. In a 2016 survey of dentists, lithium disilicate was preferred for front crowns (54% of respondents), while monolithic zirconia was the most common recommendation for molars (32%). For a back-tooth scenario, PFM came next at 31% and lithium disilicate at 21%, and recommendations varied with the dentist and practice.

That spread is a useful reminder: there is no single correct answer. Laboratory work backs the picture. A study of monolithic CAD/CAM lithium disilicate found fracture load above average posterior biting force on implant-supported restorations, while heat-pressed veneered zirconia withstood even more. So E.max can work on a molar in the right case, and zirconia gives more margin.

First molars also tend to do well with crowns. A British Dental Journal analysis of restoration longevity reported that they generally showed better crown performance than other tooth types.

How a crown is fitted

The process usually takes two visits, though digital workflows can shorten it. Cleveland Clinic describes the sequence:

1. Preparation. The tooth is shaped and any decay removed.
2. Impressions. A physical or digital scan records the tooth for the laboratory.
3. Temporary crown. This protects the tooth while the final crown is made.
4. Fitting. The final crown is checked for fit, bite and colour, then bonded with dental cement.

Tell your dentist if the temporary feels high or sensitive. A bite that is slightly off is easy to fix at the fitting stage and harder to live with afterwards.

If you want to see how crowns and bridges are handled at our clinic, read about our dental crowns and bridges. For multiple damaged teeth, full mouth rehabilitation plans the materials together so they work as one bite.

How long crowns last and how to care for them

Crowns last between five and 15 years with proper care, according to Cleveland Clinic. The range is wide because the material is only part of the story. Hygiene, grinding habits, diet and the health of the tooth underneath all count.

The American College of Prosthodontists recommends at-home oral hygiene plus lifelong professional maintenance with regular recall examinations. It stresses that restored teeth need as much or more care than natural ones, so a crown is not a set-and-forget fix.

In practice:

• Brush twice a day and clean between teeth daily, paying attention to the gumline around the crown.
• Keep to regular check-ups so margins and bite are monitored.
• Book professional teeth cleaning to remove plaque and tartar that home care misses.
• Avoid biting hard objects such as ice or pen caps, and ask about a night guard if you grind.

Our perspective

Patients often arrive asking for a specific material because they have read that one is best. We would rather start with the tooth. A zirconia crown on a front tooth where light and translucency matter, or an E.max crown on a molar of a heavy clencher, can each be the wrong answer even though each material is excellent.

We see crowns as one part of a mouth, not a stand-alone product. Gum health, bite, neighbouring teeth and your smile goals all feed into the decision, which is why we combine doctor-led consultation with the full range of dental care under one roof. Our aim is refined, natural results that look like your own teeth, and a plan you understand before treatment begins.

— Yoyime

Planning a crown in Dubai

If you are comparing options, the most useful step is an assessment where the dentist explains why a particular material fits your tooth. At Yoyimé Clinic in Deira, our dental team offers dental crowns and bridges alongside general, cosmetic and orthodontic care, so a restoration can be planned with the rest of your treatment in view.

To understand what to budget, read our guide to dental crowns cost in Dubai. When you are ready, you can book a dental consultation with us. Our oral wellness plan, Oral Wellness 360°, is worth a look if you want ongoing preventive care around your restorations.

Crowns and dental insurance in the UAE

Insurers set their own conditions. Daman’s published guideline, for example, considers coverage for single-unit crowns on incisors, canines, premolars and first and second molars when its tooth-eligibility and restorability criteria are met, including a crown-to-root ratio of at least 1:1. It requires pre-authorisation for all permanent crown codes, and basic treatment for active caries or periodontal disease must be completed before a crown request is submitted.

In plain terms, a tooth with untreated decay or gum disease may need that treatment first. Check your own policy and plan terms before treatment, and ask the clinic what documentation they will need.

FAQ

Which crown is better, E.max or zirconia?

Neither wins everywhere. Zirconia is stronger, so it is commonly chosen for molars and for people who clench. E.max is more translucent and bonds well to the tooth, so it is often chosen for front teeth where appearance matters most. Your dentist should pick based on the tooth and your bite.

What is the best crown material for molars?

In a survey of dentists, monolithic zirconia was the most frequent recommendation for molars, followed closely by PFM, with lithium disilicate third. Strength and your bite are the main factors. Your dentist may suggest a different material if there is limited space or a visible molar.

Are metal crowns better than ceramic crowns?

Metal crowns are very durable and need little tooth removal, but they are noticeably metallic. Ceramic crowns look far more natural and can now be strong enough for many back teeth. Metal remains a sensible choice for hidden teeth where durability is the priority.

How long does a dental crown last?

Cleveland Clinic gives a range of five to 15 years with proper care. Good brushing, cleaning between teeth, regular check-ups and managing grinding help it reach the upper end. Material choice matters, but care and bite matter too.

Does a crown need special care?

Not special products, but consistent habits. Clean carefully around the gumline, keep your recall appointments and avoid chewing very hard objects. Restored teeth need at least as much attention as natural ones.

Sources

• Dental Crowns: Types, Procedure & Care, Cleveland Clinic
• Materials for Indirect Restorations, American Dental Association
• Current status on lithium disilicate and zirconia, PMC
• The effect of two preparation designs on the fracture resistance of crowns, PMC
• Six-year clinical performance of lithium disilicate, PMC
• Dentist Material Selection for Single-Unit Crowns, PMC
• Fracture Load of Monolithic CAD/CAM Lithium Disilicate, Implant Dentistry
• The ultimate guide to restoration longevity in England and Wales, British Dental Journal
• American College of Prosthodontists clinical practice guidelines on caring for patients with dental restorations
• Dental crowns adjudication guideline, Daman

Recommended

• Dental Crowns Cost in Dubai: What to Expect in 2026
• Dental Crowns and Bridges
• Restorative Dentistry: Types of Repairs and When They Help
• Evidence Checklist for Patients: Dental Implants vs Bridges