Metal Dental Crowns: Gold, Zirconia & More Options

What Are Metal Dental Crowns?

Metal dental crowns are full-coverage restorations made entirely from metal alloy or with a metal substructure covered by porcelain. They have been used in dentistry for over a century and remain among the most durable options for restoring damaged, decayed, or weakened teeth. Modern patients now also have access to high-strength ceramics such as zirconia that offer metal-like durability without the metallic appearance.

The main metal and metal-alternative crown materials available today are gold alloy, base metal alloy (nickel-chromium or cobalt-chromium), porcelain-fused-to-metal (PFM), full porcelain (e-max), monolithic zirconia, and porcelain-fused-to-zirconia. Each material offers a different balance of strength, aesthetics, biocompatibility, and cost.

A comprehensive analysis published in the Journal of Prosthetic Dentistry (2020) concluded that material selection should be individualised based on the tooth’s position and function, the patient’s biting forces and parafunction habits, aesthetic expectations, and allergy history. The Australian Dental Association similarly advises that no single material is best for every situation — the right crown is the one that best meets your clinical and personal requirements.

At Townsville Dental Clinic, we offer the full range of crown materials and help you choose the option that balances durability, appearance, and value for your specific situation.

Crown Material Comparison: 6 Options Side by Side

Data compiled from systematic reviews published in the Journal of Prosthetic Dentistry and the International Journal of Prosthodontics.

When Gold Crowns Are the Best Choice

Gold alloy crowns remain the gold standard for longevity in restorative dentistry. Despite their metallic appearance, they offer advantages that no other material can match.

Gold is ideal when:

• The tooth is a second molar or other non-visible tooth where aesthetics are not a concern
• You have bruxism (teeth grinding) — gold wears at a rate similar to natural enamel, protecting opposing teeth from excessive wear
• You want the longest-lasting restoration possible — gold crowns routinely survive 20 to 40+ years
• You have a thin or minimal tooth structure remaining — gold can be cast thinner than porcelain while maintaining strength
• You have nickel allergy — gold alloy crowns are nickel-free and highly biocompatible

A landmark study tracking gold restorations over four decades found that 87% of gold crowns were still functional after 40 years — a survival rate unmatched by any ceramic material. Gold’s unique malleability allows it to form an exceptionally tight seal at the tooth margin, reducing the risk of secondary decay that causes most other crowns to fail.

When Zirconia Crowns Are the Best Choice

Monolithic zirconia has emerged as the preferred material for patients who want metal-like strength without metal. It is the strongest tooth-coloured crown material available today.

Zirconia is ideal when:

• You want a tooth-coloured crown on a molar where high biting forces are present
• You have bruxism and prefer a metal-free option — zirconia’s compressive strength of 900 to 1,200 MPa withstands heavy grinding forces
• You have a metal allergy or sensitivity and need a biocompatible, hypoallergenic material
• You want good aesthetics with excellent durability — modern multi-layered zirconia offers improved translucency compared to earlier generations
• You are replacing an old PFM crown and want to eliminate the dark metal margin at the gum line

The Journal of Prosthetic Dentistry (2022) reported that monolithic zirconia crowns demonstrate a 10-year survival rate above 97%, placing them among the most reliable modern crown materials. Newer ultra-translucent zirconia formulations have significantly improved the aesthetics of this material, although it still does not match the natural translucency of e-max for front teeth in highly aesthetic cases.

When Porcelain Crowns Are the Best Choice

Full porcelain crowns — particularly lithium disilicate (e-max) — are the material of choice when a natural, lifelike appearance is the top priority.

Porcelain/e-max is ideal when:

• The crown is on a front tooth or other highly visible position where aesthetics are paramount
• You have translucent natural teeth — e-max can be layered to replicate the depth and light transmission of enamel
• Biting forces are moderate (incisors, canines, premolars) — e-max handles normal anterior function well
• You want a metal-free, biocompatible restoration
• You are having multiple adjacent crowns where colour matching between restorations is critical

While e-max crowns are the most aesthetically convincing option, they are not recommended as the sole material for patients with bruxism or for heavily loaded molar teeth. In those situations, a zirconia or gold crown on the back teeth combined with e-max on visible teeth provides the best combination of strength and beauty.

Metal Allergy Considerations

Metal allergies are a genuine clinical concern that should be discussed before any crown is placed. The most common dental metal allergy is to nickel, which is present in many base metal alloy crowns.

Key facts about dental metal allergies:

• Nickel allergy affects approximately 10 to 20% of women and 1 to 3% of men in Australia
• Base metal alloy crowns (nickel-chromium) contain 60 to 80% nickel and should be avoided in patients with known nickel sensitivity
• Gold alloy crowns are typically nickel-free and are well-tolerated by patients with metal sensitivities
• Zirconia and e-max crowns are completely metal-free and are the safest option for patients with confirmed or suspected metal allergies
• PFM crowns may contain nickel in the metal substructure depending on the alloy used — ask your dentist to specify a nickel-free alloy if you have concerns

Symptoms of a dental metal allergy may include localised gum inflammation, persistent soreness around the crown, oral lichenoid reactions (white patches on the cheek or gums near the restoration), or a metallic taste. If you experience any of these symptoms after receiving a metal crown, consult your dentist for evaluation.

The Australian Dental Association recommends that practitioners take a thorough allergy history before selecting crown materials, and that nickel-free alternatives be offered to patients with known metal sensitivities. At Townsville Dental Clinic, we discuss your allergy history as part of every crown consultation and can arrange biocompatibility testing if needed.

Choosing the Right Crown Material: A Decision Guide

Selecting the right crown material comes down to balancing four factors: durability, aesthetics, biocompatibility, and budget. Here is a simplified decision framework:

• Back molar + longevity priority + not concerned about appearance → Gold alloy
• Back molar + metal-free preference + strong biter or grinder → Monolithic zirconia
• Front tooth + natural appearance priority → E-max (lithium disilicate)
• Any tooth + good aesthetics + high strength + metal-free → Porcelain-fused-to-zirconia
• Any tooth + budget-conscious + adequate strength → Porcelain-fused-to-metal (nickel-free alloy)
• Known metal allergy → Zirconia or e-max (completely metal-free)

Your dentist will also consider the amount of remaining tooth structure, the health of the surrounding gums, whether the tooth has had root canal treatment, and your bite relationship when recommending a material.

Key Takeaway

The best dental crown material depends on where the tooth is located, how much force it bears, how important appearance is to you, and whether you have any metal sensitivities. Gold remains unmatched for longevity on back teeth, zirconia offers the best combination of strength and aesthetics for metal-free restorations, and e-max porcelain delivers the most natural appearance for front teeth. At Townsville Dental Clinic, we guide you through every option so you receive a crown that performs beautifully for years to come.

Ready to discuss your crown options? Book a consultation at Townsville Dental Clinic to find the right material for your needs.

Sources: Journal of Prosthetic Dentistry (2015, 2020, 2022), International Journal of Prosthodontics, Australian Dental Association clinical guidelines. Content reviewed for accuracy in accordance with Australian dental standards.