Inlays vs Onlays vs Crowns Explained
Medically reviewed by MyDentalFly Clinical Team
Updated 28 March 2026 · Fact-checked for accuracy
Not sure whether you need an inlay, onlay, or crown? Here's how dentists decide — and what each costs.
Researching dental treatment abroad?
How to get the most from MyDentalFly
Read this article
You're already doing the right thing — research first, decide later.
Take the 2-minute dental health check
Get a free Dental Health Report — what treatments you may need, likely costs, and savings vs your home country.
Compare clinics or talk to us
Match with vetted clinics across Turkey, Hungary, and Poland — or book a free no-pressure consultation.
Most people have heard of crowns. Far fewer know that inlays and onlays exist — and that for many patients, they're a better option: less drilling, more of your natural tooth preserved, and often cheaper.
The difference between them is mostly about how much of your tooth needs protecting.
What's the Actual Difference?
Think of it as a spectrum of coverage:
- Inlay — fits inside the cusps (the raised points) of a back tooth. Like a puzzle piece that fills a cavity too large for a regular filling but doesn't touch the outer edges.
- Onlay — extends over one or more of the cusps. It covers more surface area than an inlay but still preserves most of the natural tooth structure.
- Crown — caps the entire visible tooth. Used when there isn't enough healthy tooth left to support an inlay or onlay.
None of them are better or worse in isolation. The right choice depends entirely on how much tooth structure remains after decay or damage is removed.
When Dentists Choose Each Option
A dentist will typically recommend:
An inlay when the decay sits between the cusps and a regular filling would be too large to be reliable. Inlays bond tightly and can last well over a decade with good care.
An onlay when one or more cusps are cracked, weakened, or decayed. It offers more protection than an inlay without the full coverage of a crown — sometimes called a "partial crown" for this reason.
A crown when the tooth is severely broken, has had a root canal, or there simply isn't enough healthy structure left. A crown is also used after a dental implant is placed (the crown sits on top of the implant post).
"My dentist back home said I needed a crown, but the clinic in Istanbul told me an onlay would do the same job and cost less. I wish I'd had a second opinion earlier."
The honest truth: crowns are sometimes over-prescribed. They're faster for the dentist and more profitable. If a second opinion is available, it's worth getting one. If you've completed the free assessment on MyDentalFly, your Dental Health Report will flag whether a tooth appears to need full coverage or could be suitable for a more conservative option — and our Pearl AI can answer follow-up questions based on your specific dental data.
What They Cost (UK vs Turkey)
Here's where it gets interesting. Inlays and onlays aren't widely advertised in the UK — many patients don't even know to ask for them. But in Turkey and Hungary, they're commonly performed and priced clearly.
| Treatment | UK (average) | Turkey (range) | Saving |
|---|---|---|---|
| E-max Crown | £900 | £140–£250 | Up to 84% |
| Porcelain Crown | £800 | £100–£180 | Up to 87% |
| Zirconia Crown | £850 | £120–£220 | Up to 86% |
| Ceramic Inlay | £350–£500 | £80–£150 | Up to 78% |
| Ceramic Onlay | £400–£600 | £100–£180 | Up to 75% |
UK prices are estimates for private treatment. NHS patients may pay Band 3 charges (currently £306.80), but complex restorations are often not available on the NHS.
If you need multiple teeth treated — which is common in patients who've delayed treatment — the savings add up fast. Four inlays in Turkey instead of the UK could save you over £1,200 on treatment alone, before factoring in the cost of the flight.
For current Turkey pricing across all treatments, see our dental prices in Turkey 2026 guide.
Materials: Composite, Ceramic, or Zirconia?
The material affects durability, appearance, and cost.
Composite resin — the cheapest option for inlays and onlays, but more prone to staining and wear. Often used for back teeth where aesthetics matter less.
E-max (lithium disilicate ceramic) — the gold standard for inlays, onlays, and crowns on visible teeth. Strong, natural-looking, and bonds well to tooth structure. This is what most patients end up choosing.
Zirconia — extremely durable, slightly less translucent than E-max. Preferred for crowns on back teeth that take heavy chewing load. Also good if you have a history of grinding.
Porcelain-fused-to-metal (PFM) — older technology, still used. The metal base can cause a grey line at the gumline over time. Many clinics have largely moved away from these in favour of full-ceramic options.
When comparing clinics, check what material is included in the quoted price. A £180 E-max crown and a £130 PFM crown are not the same thing.
Which Lasts Longest?
With proper care, here's what the evidence suggests:
- Composite fillings: 5–10 years
- Composite inlays/onlays: 8–15 years
- Ceramic (E-max) inlays/onlays: 15–25 years
- Zirconia crowns: 15–25+ years
- E-max crowns: 10–20 years
Inlays and onlays often outperform crowns on longevity in healthy teeth because they preserve more natural tooth structure. Natural enamel is stronger than any restoration material. The more you keep, the better the long-term outcome.
That said, a poorly placed inlay can fail faster than a well-placed crown. The skill of the treating dentist — and the quality of the lab producing the restoration — matters enormously.
See How Much You Could Save
Select your treatments below — takes 30 seconds
Implants
Cosmetic
General
Prices based on verified averages from our partner clinics. Your exact quote may vary based on your specific clinical needs. The assessment takes 2 minutes and gives you personalised pricing.
Still researching? Good — that's exactly what you should be doing.
The most common things we hear from patients: price changes on arrival, unexpected extra treatments, and not knowing whether the clinic is right for their case. Our dental health check helps you understand what you may need before any clinic gets involved — so you arrive informed, not hopeful.
Take the dental health check
Interactive, easy to understand. You mark your teeth on a visual chart, answer a few health questions, and get a free dental health report showing what treatment you may need and what it could cost. Not every clinic suits every case — we match you based on your actual dental situation.
Not ready for that? Talk to Adam.
No sales pitch — he'll answer your questions, explain what to expect, and help you figure out next steps. That's it.
Just browsing? That's fine too — we have 150+ articles and free tools to help your research.
Can You Get Inlays and Onlays Abroad?
Yes. Inlays and onlays are routinely performed in Turkey, Hungary, Poland, Spain, and Dubai — often to the same clinical standard as in the UK, using the same materials from European and American dental labs.
Turkey is the most popular destination purely on price. But Hungary (particularly Budapest) has a long-established reputation for complex restorative work, with many UK-trained dentists and accredited labs. Spain and Dubai appeal to patients who want to combine treatment with a holiday or work trip.
The process is straightforward. Most inlays and onlays require two visits: one to prepare the tooth and take impressions, one to fit the final restoration. Some clinics now use CAD/CAM milling technology to do same-day restorations, which can compress the treatment into a single longer appointment — useful for dental tourists with limited time.
If you're considering going abroad, read our guide on how to choose a dental clinic in Turkey before booking anything.
One thing to watch for: inlays and onlays require more precision than fillings. Don't just go for the cheapest quote. A poorly fitted restoration can cause sensitivity, cracking, or failure within a few years. Unlike directories that list any clinic that pays for a spot, MyDentalFly only works with vetted clinics — each reviewed against clinical and patient experience standards before they appear in your results.
Once your Dental Health Report is ready, you can use the side-by-side clinic comparison to see real prices, in your currency, from clinics across multiple destinations — not just Turkey.
Deciding Between Inlays, Onlays, and Crowns
If you're trying to work out what you need before your next appointment, the main questions are:
- How much of the tooth is still intact?
- Has the tooth had a root canal?
- Is it a back tooth (high chewing load) or a front tooth (aesthetic priority)?
- Do you grind your teeth at night?
An inlay or onlay is worth asking about if your tooth is mostly intact but has significant decay or an old failing filling. If your dentist immediately recommends a crown without mentioning the alternatives, it's reasonable to ask why.
For patients comparing this decision alongside veneers (for cosmetic concerns), see our veneers vs crowns guide — they serve very different purposes.
Start with the free assessment. Complete the interactive dental chart, answer the health questions, and you'll have a Dental Health Report that gives you a structured view of what each tooth may need — before you've committed to any clinic or country.
What's the difference between an inlay and a filling?
A filling is placed as a soft material that hardens in place. An inlay is custom-made in a lab (or milled by machine) to fit the cavity precisely, then bonded in. Inlays are stronger, longer-lasting, and more accurate — but cost more and require at least two appointments.
Can an onlay replace a crown?
Sometimes, yes. If enough of the tooth structure remains, an onlay can provide similar protection to a crown while preserving more of the natural tooth. Ask your dentist to assess whether an onlay is viable before committing to a crown.
Is it safe to get an inlay or onlay in Turkey?
Yes, provided you choose a properly accredited clinic with experienced restorative dentists and a quality dental lab. Turkey has hundreds of clinics — quality varies significantly. Stick to clinics that can show patient reviews, accreditation, and clear before/after documentation.
How many appointments do I need if I go abroad?
Most inlays and onlays require two appointments (preparation and fitting), typically 5–7 days apart. Some clinics offering CAD/CAM technology can do same-day restorations in a single extended visit. Confirm this before booking travel.
Will my UK dentist accept work done abroad?
Most UK dentists will check and maintain dental work done abroad, though some are cautious about it. It helps to return with full documentation of the materials used and a clinical report from the treating dentist. MyDentalFly clinics provide a patient summary for exactly this reason.
See also: Is Dental Tourism Safe?
Next Steps
The candidacy checker tells you in 60 seconds if you're suitable for implants. The free dental health check maps your teeth and tells you what you actually need. The savings calculator shows verified clinic prices vs home costs.
We've verified every clinic on our platform and removed eight that didn't meet our standards — unlike directories that list anyone who pays. Your dental tourism consultant coordinates everything once you're ready.
Guide: Dental Implants Abroad Guide
Related: Dental Implants vs Bridges: How to Decide
Related: Dental Crown Cost: UK vs Abroad
Key Takeaway
Before you book anything, get a dental health check. Knowing exactly what treatment you need — and what it should cost — protects you from surprise bills, unnecessary procedures, and clinics that don't match your needs.
Know what you may need before you fly
The most common concerns we hear from patients:
- •“The price changed when I arrived — they said I needed extra work”
- •“I didn't know which clinic was right for my situation”
- •“I had no way to compare — every clinic quoted different things”
We built MyDentalFly to solve these problems. Not by replacing clinics, but by making sure you understand what you may need before any clinic gets involved.
Our interactive dental health check lets you map your teeth, answer a few health questions, and get a free report showing what treatment you may need and what it could cost. It's interactive, easy to understand, and designed for people without a dental background.
From there, we match you with clinics based on your actual dental situation — not every clinic suits every case. Some cases need experienced surgeons, some need specific equipment. You compare real treatment plans side by side and decide when you're ready.
Take the dental health check
Interactive dental chart, health questions, free report. No sign-up needed.
Talk to Adam instead
Patient Coordinator
Not ready for the health check? That's fine. Adam can answer your questions, explain what to expect, and help you figure out next steps. No pressure.
MyDentalFly is an independent comparison platform — not a clinic. We don't provide medical advice. The dental health check is informational only.
Pearl AI
Ask me anything about this article or dental treatment abroad
What are you researching today — are you thinking about getting this treatment abroad, or still in the early stages?
Why use a platform for dental treatment abroad?
Think of us like Booking.com for dental tourism — except we assess you first.
Getting dental work abroad means navigating a different healthcare system, a different language, and clinics you've never visited — all while trying to understand what treatment you actually need. Most people do this alone, piecing together information from WhatsApp messages and online reviews.
MyDentalFly organises the entire process. Your dental needs are assessed before you travel, you compare treatment plans from vetted clinics side by side, and everything — from your initial assessment to your aftercare notes — is documented on your patient portal. We're not a clinic and we don't sell treatment. We're the layer between you and the clinic that keeps everything transparent and on track.
Assessed before you fly
Know exactly what you need before any clinic touches you
Vetted clinics only
We monitor standards and remove clinics that fall short
Everything documented
Treatment plans, clinical notes, and aftercare — all on your portal
Someone in your corner
We speak to the clinic directly if anything needs clarifying
