Zirconia implant crowns are generally stronger and more biocompatible than porcelain-fused-to-metal (PFM) crowns, while PFM crowns can still be a reasonable option in some back-tooth situations where cost or specific bite factors matter. If you're weighing up implant crown materials, it helps to know what the research actually shows rather than relying on marketing terms like "premium" or "advanced". Here's what the evidence says about strength, appearance, and how long each option tends to last.
Key takeaways
- Zirconia has a flexural strength of roughly 900 to 1,400 MPa compared to around 120 MPa for the porcelain layer on a PFM crown.
- Published data shows zirconia crowns with survival rates around 97 to 99 percent at 5 years, compared to roughly 90 to 95 percent for porcelain-based restorations over the same period.
- Zirconia surfaces tend to attract less plaque and bacterial biofilm than metal alloy margins, which can matter for long-term gum health around an implant.
- PFM crowns can show a grey or dark line at the gumline over time as gums recede slightly, which zirconia generally avoids.
- Material choice depends on the tooth's location, the forces it takes during chewing, and your bite, not just personal preference.
- Neither material is guaranteed to last a lifetime, both can chip or need replacement, and your dentist's assessment of your specific case matters more than the material alone.
What each material actually is
A PFM crown has a metal substructure, usually a gold or base-metal alloy, with layered porcelain fused over the top to match the colour of your other teeth. A zirconia crown is milled from a solid block of zirconium dioxide, a strong ceramic material, either as a single solid piece (monolithic zirconia) or with a porcelain layer added over a zirconia core for extra translucency near the front teeth. Both attach to the implant via an abutment, which we cover in more detail in our guide to the parts of a dental implant.
Strength and durability compared
This is where the difference between the two materials is clearest. The porcelain layer on a PFM crown has a flexural strength around 120 MPa, and it's this outer layer, not the metal underneath, that's prone to chipping under heavy biting forces, especially in patients who grind their teeth. Full-contour zirconia, by comparison, has a flexural strength in the range of 900 to 1,400 MPa, several times stronger, and monolithic zirconia crowns are far less prone to chipping because there's no separate porcelain layer to fracture off.
| Factor | Zirconia | Porcelain-fused-to-metal |
|---|---|---|
| Flexural strength | Approximately 900-1,400 MPa | Approximately 120 MPa (porcelain layer) |
| 5-year survival rate (published data) | Around 97-99% | Around 90-95% |
| Chipping risk | Low, especially monolithic zirconia | Moderate, porcelain layer can chip under heavy load |
| Appearance and translucency | Natural, tooth-like, no metal shadow | Good, but can show a grey line at the gum over time |
| Biocompatibility and plaque attraction | Generally lower plaque affinity | Metal margin can attract more biofilm at the gumline |
| Typical Australian cost range | Roughly $1,800-$2,800 per crown | Roughly $1,500-$2,300 per crown |
Appearance: which looks more natural
Zirconia generally has the edge for aesthetics, particularly on front teeth. It can be shaded and layered to mimic natural translucency, and because there's no metal substructure, there's no risk of a grey shadow showing through the gum tissue or a dark line appearing at the gumline as gums recede with age. PFM crowns can still look very good, especially on back teeth where they're less visible, but the metal margin is the trade-off worth knowing about upfront.
Longevity and gum health around the implant
Research comparing monolithic zirconia to PFM implant crowns has found zirconia crowns show fewer mechanical complications and higher patient satisfaction over time. Zirconia surfaces also appear less prone to harbouring the bacterial biofilms linked to peri-implant gum problems, which matters because keeping the gum around an implant healthy is one of the biggest factors in how long an implant crown lasts overall. That said, good home care matters more than material alone, and our guide on how to clean dental implants at home covers the daily habits that protect any crown type.
When PFM might still make sense
Zirconia isn't automatically the right answer for every situation. PFM crowns have decades of clinical track record, can be a lower-cost option, and in some back-tooth cases where extreme bite forces and metal's proven flexibility matter more than aesthetics, a dentist may still recommend it. The right choice depends on where the tooth sits, how you bite and grind, your gum health, and your budget, which is why this is a conversation worth having in person rather than deciding from a chart alone.
What can go wrong with either material
No crown material is indestructible. If a crown feels loose, chips, or the bite feels off, it's worth getting checked promptly rather than waiting, our article on what to do about a loose dental implant crown covers what to watch for. Some patients also ask whether implant crowns can change colour over time, which we address separately in do dental implants stain or discolour. And if you're earlier in the implant process and want to understand how the implant itself integrates with bone before a crown even goes on, see our explainer on osseointegration.
Frequently asked questions
Is zirconia always better than porcelain-fused-to-metal?
Not always. Zirconia generally has higher strength, better aesthetics, and lower plaque affinity, but PFM remains a valid option in specific clinical situations, particularly on back teeth with heavy bite forces or budget constraints.
Do zirconia crowns look more natural than PFM?
Generally yes, especially at the gumline, since there's no metal margin to potentially show through as gums change over time.
Which lasts longer, zirconia or PFM?
Published data shows zirconia implant crowns with survival rates around 97 to 99 percent at 5 years, compared with roughly 90 to 95 percent for porcelain-based restorations, though individual results depend on bite forces, grinding habits, and oral hygiene.
Can a zirconia crown chip?
It's less likely than a PFM crown chipping, but it can still happen, particularly with layered zirconia that has a porcelain overlay, or under very heavy grinding forces.
Is one material more expensive than the other?
Zirconia crowns tend to sit at the higher end of the typical cost range in Australia, though exact pricing depends on the lab, the case complexity, and whether it's monolithic or layered zirconia.
Will my dentist choose the material for me?
Your dentist will usually recommend a material based on the tooth's position, your bite, and your gum health, then talk through the options and trade-offs with you before deciding together.
Can I switch crown material later if I'm not happy?
In many cases yes, a crown can be replaced with a different material if needed, though this depends on the state of the implant and abutment underneath.
If you're considering a dental implant or want to talk through crown material options for your specific case, the Lumi team offers a complimentary consult. Learn more on our dental implants page or check our current offers. This article is general information and not a substitute for personal dental advice.
