PFM vs Zirconia Crown: Which One Is Better?

 

PFM vs Zirconia Crowns: A Scientific Comparison by a Dentist

By CrackDental – Clinical Dentistry Simplified

 
PFM Crown vs Zirconia Crown

Introduction

Dental crowns are among the most commonly performed restorative procedures in modern dentistry. Whether a tooth has undergone root canal treatment, suffered extensive decay, fractured due to trauma, or requires cosmetic rehabilitation, a crown often becomes the treatment of choice for restoring function, strength, and appearance.

For decades, Porcelain-Fused-to-Metal (PFM) crowns were considered the gold standard in fixed prosthodontics. However, the introduction of zirconia crowns has significantly changed restorative dentistry. Today, many patients ask:

“Which crown is better—PFM or Zirconia?”

The answer is not as straightforward as many advertisements suggest. While zirconia crowns are often marketed as superior, PFM crowns continue to perform exceptionally well in numerous clinical situations. The ideal choice depends on factors such as esthetics, occlusion, tooth location, parafunctional habits, preparation design, and patient expectations.

This comprehensive guide explores the differences between PFM and zirconia crowns from a scientific and clinical perspective, helping both dentists and patients make informed decisions.

Understanding Dental Crowns

A dental crown is a custom-made restoration that completely covers the visible portion of a damaged tooth.

Its primary functions include:

  • Restoring tooth strength
  • Protecting weakened tooth structure
  • Improving esthetics
  • Restoring chewing efficiency
  • Supporting fixed prostheses
  • Preventing fracture of endodontically treated teeth

The long-term success of a crown depends not only on the material but also on:

  • Tooth preparation
  • Margin design
  • Cementation
  • Occlusal adjustment
  • Oral hygiene maintenance  

Also Read:  Dental Veneers vs Dental Crowns: Which One Is Better? 

What Is a PFM Crown?

A Porcelain-Fused-to-Metal (PFM) crown consists of:

  1. A metal coping forming the internal framework
  2. Porcelain fused onto the metal surface

The metal substructure provides strength, while porcelain provides tooth-colored esthetics.

Components of a PFM Crown

  • Metal alloy (Nickel-Chromium, Cobalt-Chromium, Gold alloy)
  • Opaque porcelain layer
  • Dentin porcelain
  • Enamel porcelain

The metal framework supports the ceramic and reduces fracture risk.

PFM crowns have been used successfully for more than 60 years and remain one of the most researched restorations in dentistry.

What Is a Zirconia Crown?

Zirconia crowns are fabricated from Yttria-Stabilized Tetragonal Zirconia Polycrystal (Y-TZP).

Zirconia is often referred to as:

"Ceramic steel"

because of its exceptional strength and fracture resistance.

Unlike PFM crowns, zirconia crowns are completely metal-free.

Modern zirconia restorations may be:

  • Monolithic zirconia
  • Layered zirconia
  • High-translucency zirconia
  • Multi-layered gradient zirconia

These restorations are usually fabricated using CAD/CAM technology.

PFM Crown vs Zirconia: Structural Differences

PFM Crown vs Zirconia: Structural Differences


Evolution of Crown Materials

First Generation

  • Full metal crowns

Advantages:

  • Extremely durable
  • Excellent marginal adaptation

Disadvantages:

  • Poor esthetics

Second Generation

  • PFM crowns

Combined strength and esthetics.

Third Generation

  • All-ceramic crowns

Including:

  • Zirconia
  • Lithium disilicate
  • Alumina ceramics

Designed to provide metal-free esthetics.

PFM vs Zirconia: Quick Comparison

FeaturePFM CrownZirconia Crown
Metal PresenceYesNo
EstheticsGoodExcellent
StrengthVery HighExtremely High
BiocompatibilityGoodExcellent
Gum AppearanceMay show dark lineNatural appearance
Fracture ResistanceExcellentExcellent
Metal Allergy RiskPossibleNone
Longevity10–20+ years10–20+ years
Tooth ReductionMoreLess
CostLowerHigher
CAD/CAM CompatibilityLimitedExcellent

Strength Comparison

One of the biggest misconceptions is that zirconia is only slightly stronger than PFM.

In reality, zirconia possesses one of the highest flexural strengths among dental ceramics.

Typical Strength Values

MaterialFlexural Strength
Feldspathic Porcelain60–120 MPa
Lithium Disilicate360–500 MPa
PFM Porcelain Layer90–120 MPa
Zirconia900–1500 MPa

Why Zirconia Is So Strong

Zirconia exhibits a phenomenon known as:

Transformation Toughening

When a crack begins to develop:

  • Zirconia crystals expand
  • Crack propagation is interrupted
  • Material resists fracture

This unique property is absent in traditional porcelain.

Esthetic Comparison

Esthetics is where the greatest difference exists.

PFM Esthetics

PFM crowns rely on porcelain covering an opaque metal framework.

Challenges include:

  • Opaque appearance
  • Reduced light transmission
  • Grayish appearance in some cases
  • Visible metal margins over time

In highly esthetic zones, these limitations become noticeable.

Zirconia Esthetics

Modern translucent zirconia mimics natural enamel more effectively.

Advantages include:

  • Better translucency
  • No metal shadow
  • Improved color blending
  • More natural smile appearance

Particularly beneficial for:

  • Upper front teeth
  • Smile makeovers
  • Young patients

The Dark Gum Line Problem

One common complaint with aging PFM crowns is:

Black Line Near the Gums

This occurs because:

  • Gingival recession exposes metal margins
  • Opaque metal becomes visible

Although not harmful, it affects appearance.

Zirconia crowns eliminate this issue because they contain no metal.

Tooth Reduction Requirements

Preserving tooth structure is a fundamental principle of dentistry.

PFM Crowns

Require:

  • 1.5–2 mm occlusal reduction
  • Additional space for porcelain and metal

More healthy tooth structure is removed.

Zirconia Crowns

Can often function with:

  • 0.8–1.5 mm reduction

This allows a more conservative preparation.

Biocompatibility

Biocompatibility refers to how tissues react to a material.

PFM Crowns

Generally safe.

However:

  • Nickel allergies may occur
  • Some patients experience metal sensitivity

Zirconia Crowns

Exceptional biocompatibility.

Research demonstrates:

  • Minimal plaque accumulation
  • Excellent soft tissue response
  • Low inflammatory reaction

This makes zirconia especially attractive for patients with metal allergies.

Performance in Bruxism Patients

Patients who grind their teeth generate enormous occlusal forces.

PFM Crowns

Advantages:

  • Strong framework
  • Long clinical track record

Disadvantages:

  • Porcelain chipping can occur

Zirconia Crowns

Monolithic zirconia performs exceptionally well under heavy load.

For many bruxism cases, zirconia has become the preferred option.

Wear on Opposing Teeth

A common myth states:

"Zirconia destroys opposing teeth."

Modern evidence suggests otherwise.

Properly polished zirconia often causes less wear than rough porcelain surfaces.

The key factor is not the material itself but:

  • Surface finishing
  • Polishing quality
  • Occlusal adjustment

Longevity: Which Lasts Longer?

Both restorations demonstrate excellent long-term survival.

PFM Survival Rates

Studies report:

  • 90–95% survival after 10 years
  • Many functioning beyond 20 years

Zirconia Survival Rates

Modern studies demonstrate:

  • Comparable or superior survival
  • Excellent resistance to fracture

Current evidence indicates that properly fabricated zirconia crowns may match or exceed the longevity of traditional PFM crowns.

Common Causes of Failure

PFM Crown Failure

  • Porcelain chipping
  • Metal exposure
  • Secondary caries
  • Poor margins
  • Cement failure

Zirconia Crown Failure

  • Loss of retention
  • Poor bonding protocol
  • Occlusal overload
  • Framework design errors

Most failures occur because of clinical factors rather than material limitations.

Clinical Situations Where PFM May Be Better

Despite zirconia's popularity, PFM remains valuable.

PFM may be preferred when:

Long-Span Bridges

Metal frameworks offer predictable support.

Limited Budget

PFM crowns are often less expensive.

Extensive Clinical Experience

Many clinicians have decades of success with PFM.

Complex Occlusal Cases

Certain situations still benefit from metal reinforcement.

Clinical Situations Where Zirconia Is Better

Anterior Esthetic Zone

Superior appearance.

Metal Allergy Patients

Completely metal-free.

Bruxism Patients

Monolithic zirconia offers exceptional durability.

Implant Crowns

Excellent soft tissue response.

Patients Seeking Premium Esthetics

Zirconia generally provides the most natural result.

Common Myths About Zirconia

Myth 1: Zirconia Never Breaks

False.

Although extremely strong, improper design can still lead to failure.

Myth 2: Zirconia Is Always Better

False.

Material selection should be case-specific.

Myth 3: PFM Is Outdated

False.

Millions of successful PFM restorations remain functional worldwide.

Myth 4: All Zirconia Crowns Are the Same

False.

Different generations vary significantly in:

  • Strength
  • Translucency
  • Clinical indication

Cost Comparison

Costs vary depending on:

  • Geographic location
  • Laboratory quality
  • Dentist expertise
  • Material brand

Generally:

PFM < Zirconia

However, long-term value often depends more on quality than initial cost.

Dentist's Decision-Making Algorithm

Choose Zirconia When:

✓ High esthetic demand
✓ Metal-free preference
✓ Bruxism present
✓ Implant crown required
✓ Front tooth restoration

Choose PFM When:

✓ Budget is limited
✓ Long-span bridge needed
✓ Proven metal-supported design preferred
✓ Specific laboratory expertise available

Frequently Asked Questions

Which crown looks more natural?

Zirconia crowns generally provide a more natural appearance due to their superior translucency.

Which crown is stronger?

Zirconia is stronger in terms of flexural strength.

Can zirconia crowns break?

Yes, but the risk is very low when properly designed.

Do PFM crowns contain metal?

Yes. They consist of porcelain fused to a metal framework.

Is zirconia worth the extra cost?

For patients prioritizing esthetics and biocompatibility, zirconia often justifies the additional expense.

Key Takeaways

  • PFM crowns remain highly reliable restorations.
  • Zirconia crowns provide superior esthetics and biocompatibility.
  • Modern monolithic zirconia demonstrates exceptional strength.
  • Both materials can last well beyond a decade.
  • The success of a crown depends more on clinical execution than material alone.
  • There is no universally "best" crown—only the best crown for a particular patient.

Conclusion

The debate between PFM and zirconia crowns should not be viewed as a competition between an old material and a new one. Instead, it is a question of selecting the right restoration for the right clinical situation.

PFM crowns have earned their reputation through decades of predictable performance and remain a dependable choice in many restorative cases. Zirconia crowns, on the other hand, represent the evolution of dental materials, offering exceptional strength, superior esthetics, and outstanding biocompatibility.

For most modern patients seeking a natural-looking, durable, and metal-free restoration, zirconia is often the preferred option. However, when carefully planned and executed, both PFM and zirconia crowns can provide years of successful function and patient satisfaction.

References

  1. Rosenstiel SF, Land MF, Fujimoto J. Contemporary Fixed Prosthodontics. 6th Edition. Elsevier.
  2. Shillingburg HT, Sather DA, Wilson EL. Fundamentals of Fixed Prosthodontics. Quintessence Publishing.
  3. Anusavice KJ, Shen C, Rawls HR. Phillips' Science of Dental Materials. Elsevier.
  4. Zarone F, Di Mauro MI, Ausiello P, Ruggiero G, Sorrentino R. Current status on lithium disilicate and zirconia: A narrative review. BMC Oral Health.
  5. Pjetursson BE, Sailer I, Zwahlen M, Hämmerle CHF. Systematic review of crown survival. Clinical Oral Implants Research.
  6. Sailer I, Makarov NA, Thoma DS, Zwahlen M, Pjetursson BE. All-ceramic versus metal-ceramic restorations. Dental Materials.
  7. Denry I, Kelly JR. State of the art of zirconia for dental applications. Dental Materials.
  8. Goodacre CJ, Bernal G, Rungcharassaeng K, Kan JY. Clinical complications in fixed prosthodontics. Journal of Prosthetic Dentistry.
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