What is an inlay onlay and when is it used?
An inlay onlay is a custom-made restoration that repairs a back tooth when a filling is too small and a full crown would remove too much healthy tooth. Both are made outside the mouth, in a laboratory or by a milling unit in the dental office, and then bonded to the tooth. An inlay sits inside the grooves of the chewing surface, between the cusps (the tooth's raised points). An onlay is larger: it covers one or more cusps as well, and is sometimes called a partial crown. When the restoration wraps over most of the tooth it is usually called a crown.
Dentists suggest an inlay or onlay for a molar or premolar with a large cavity, an old filling that is breaking down, or a crack that has not reached the nerve. This guide covers how they are made and fitted, which material to choose, how they compare with fillings and crowns, what they cost in Turkey against the UK, US and Germany, and what to ask. See our wider dental treatments in Turkey hub for related care.
Inlay vs onlay: what is the difference?
The difference is how much of the tooth is covered. An inlay fills the central part of the biting surface only and keeps all the cusps intact. An onlay replaces one or more cusps, so it is chosen where the walls of the tooth are weak or cracked and need protection from the bite. Because both need a precise fit, the dentist removes decay and old filling, shapes the tooth with smooth, slightly open walls, and takes an impression or digital scan. Compared with a crown, the dentist removes less tooth structure, which matters because enamel cannot grow back.
Which material: ceramic, composite or gold?
Most inlays and onlays today are tooth-coloured. Ceramic (lithium disilicate, feldspathic porcelain or zirconia) is hard, stable and stains little. Laboratory composite resin is cheaper and easier to repair or adjust, though it wears faster. Gold alloy has the best record for wear and gentleness to the opposing tooth, but is visible and now less often requested. The dentist chooses with you based on the tooth's position, your bite, and whether you grind your teeth.
| Material | Best suited to | Typical limits |
|---|---|---|
| Ceramic | Visible molars and premolars; patients wanting a natural colour match | Can chip in heavy grinding; needs a careful bond |
| Laboratory composite | Tighter budgets; teeth where repairs are likely | Wears and stains faster than ceramic |
| Gold alloy | Back teeth under heavy bite | Colour is obvious; fewer dentists offer it |
Inlay onlay or filling: when is a filling enough?
A direct filling is placed and shaped in one visit and costs less, so it is the right answer for small and medium cavities. An inlay or onlay is worth considering when the cavity is wide, when the tooth has lost one or more cusps, or when repeated large fillings have weakened the walls. Our pages on composite filling and tooth restoration describe the direct options. A well-bonded indirect restoration holds up against chewing forces more reliably than a very large filling, but it does need more steps and a higher fee.
Does an inlay onlay last, and how does it compare with a crown?
Studies of ceramic inlays and onlays report that most last for ten years or more, and failures are most often caused by new decay at the margin, a fracture of the ceramic or of the tooth, or loss of the bond. Durability depends on the dentist's technique, the isolation from saliva during bonding, your oral hygiene and whether you grind your teeth. For a tooth with only moderate damage, an onlay keeps more natural tooth than a crown, though a crown gives more protection when most of the tooth is lost. If the tooth needs a crown, our guide to zirconia crowns explains the main option.
Inlay onlay cost in Turkey compared with the UK, US and Germany
The ranges are approximate prices per tooth, not hospital quotes. Each hospital confirms its own price in a written quote.
| Country | Approximate cost per inlay or onlay |
|---|---|
| Turkey | €150 – €450 |
| United Kingdom | €450 – €1,000 |
| United States | €900 – €2,200 |
| Germany | €400 – €900 |
What changes the price: the material (composite is cheapest, gold and ceramic cost more), whether it is made in a laboratory or milled in the clinic, how much of the tooth must be rebuilt first, and whether decay near the nerve needs a root canal or a build-up. The quote should state whether the temporary filling, anaesthetic, scan or impression and adjustment visits are included, and the price per tooth.
Who is a good candidate for an inlay or onlay?
You are a good candidate if you have a back tooth with a large cavity or failing filling, enough sound tooth structure to bond to, healthy gums and good enough hygiene to keep the margin clean. A tooth with an extensive crack, very little structure left or an infected nerve may need a root canal and crown instead. Heavy grinders may be advised to use a night guard, and the dentist may prefer a tougher material. Because these restorations are bonded, the dentist needs to be able to keep the tooth dry during fitting, which can be difficult below the gum.
The inlay onlay procedure, step by step
At the first visit the tooth is numbed, decay and the old filling are removed, and the tooth is shaped. An impression or digital scan is taken and a temporary filling is placed. The laboratory makes the restoration, usually in five to seven working days; in a clinic with a chairside milling machine it can be made the same day, in about two hours. At the second visit the temporary is removed, the restoration is tried in, checked for fit and colour, then bonded with resin cement and polished. The dentist adjusts the bite before you leave. Each visit takes 45 to 90 minutes. Our page on how it works explains how the coordinator schedules visits around your travel.
How many days do I need in Turkey, and what is recovery like?
With laboratory-made restorations plan for about four to seven days, so that the two visits are separated by the lab time with a spare day for corrections. With same-day milling, one or two days can be enough. Recovery is minimal: the anaesthetic wears off in a few hours, and the tooth can feel sensitive to cold or pressure for days or a couple of weeks. Avoid very hard or sticky food for the first 24 hours, and see the dentist if the bite feels high, if the sensitivity increases or if the restoration feels loose.
Inlay onlay before and after: what to expect
A good result looks like the original tooth: the same shape, a matching shade and a smooth, nearly invisible margin where it meets the tooth. Photographs show the colour match and the surface, but they cannot show how well the bite is balanced or how precise the margin is, which are the things that decide how long it lasts. Ceramic can be matched well to neighbouring teeth but teeth whitened later will not change the restoration's colour, so whiten first if you plan to; see tooth whitening.
Risks and complications
The NHS notes that restorations of this kind can fail through decay at the edge, fracture, or loosening of the bond. Specific to inlays and onlays are post-operative sensitivity, a bite that feels high, food trapping at the margin, rarely an inflamed nerve that later needs a root canal, and breakage of a thin ceramic. Most of these are corrected by a simple adjustment or repair. A restoration that is made without good moisture control or with poor margins can leak and decay may go unseen underneath, so regular check-ups and X-rays are part of the treatment.
How to choose a clinic and what to ask
Look for a dentist registered in Turkey who explains why an inlay or onlay is suitable instead of a filling or a crown, who names the material, and who gives a written price per tooth. Red flags are a quote with no material named, pressure to crown several healthy teeth, and promises that the restoration will last for life. Useful questions:
- Which material will be used, and is it made in a laboratory or milled in the clinic?
- Why an onlay rather than a filling or a crown for this tooth?
- How much natural tooth will be removed?
- What happens if the restoration chips or loosens, and for how long is it covered?
- Does the price include the temporary, impression or scan and adjustments?
You can send photographs and X-rays through our free quote page to receive a written plan.
Hospitals with Dental Treatments in Turkey
Frequently asked questions
An inlay onlay is a custom-made restoration for a damaged back tooth. An inlay fits within the cusps of the chewing surface and an onlay also covers one or more cusps. Both are made outside the mouth and bonded to the tooth.
An inlay fills only the central biting surface and leaves the cusps intact. An onlay covers one or more cusps too, so it protects weaker tooth walls. Both remove less tooth than a full crown.
Approximate costs are €150 to €450 per tooth in Turkey, against roughly €450 to €1,000 in the UK. The material, laboratory or chairside milling and any build-up affect the price, so ask for a written quote per tooth.
Studies of ceramic inlays and onlays report that most last ten years or longer. Decay at the margin, fracture and heavy grinding are the usual causes of failure, so check-ups and a night guard if you grind can help.
Not always. A filling is enough for small and medium cavities. An inlay or onlay suits wide cavities or weakened cusps, because it is shaped outside the mouth and gives firmer support under heavy chewing.
An onlay keeps more of your natural tooth and suits moderate damage. A crown suits teeth with very little structure left or after a root canal. The dentist decides after examining and X-raying the tooth.
The tooth is numbed, so you should feel pressure but no pain. Afterwards the tooth can be sensitive to cold or biting for a few days and occasionally for a couple of weeks.
A laboratory-made restoration needs two visits about five to seven days apart, so plan four to seven days. With same-day milling in the clinic, one or two days may be enough.
Risks include sensitivity, a bite that feels high, food trapping, decay at the margin, fracture of thin ceramic and, rarely, a nerve that needs root canal treatment later. Most are fixed with adjustment or repair.
No. Ceramic and composite do not respond to whitening gel, so the restoration keeps its shade while natural teeth lighten. If you plan to whiten, do it before the shade is chosen.