An inlay or onlay is a custom-fabricated restoration used to repair a tooth that is too damaged for a filling but does not yet require a full crown. An inlay fits within the cusp tips of the tooth; an onlay extends over one or more cusps. Both are typically made from tooth-coloured ceramic (E-max or zirconia) and are fabricated in a dental laboratory for a precise fit before being bonded to the tooth. Ceramic inlays and onlays are significantly stronger and more wear-resistant than composite fillings, with clinical longevity of 15–20 years, making them the ideal mid-range restoration for large posterior cavities.
Your dentist examines the tooth with X-rays and determines whether an inlay (within cusps) or onlay (covering one or more cusps) is the appropriate restoration for the extent of damage or decay.
Under local anesthesia, existing filling material or decay is removed and the cavity is shaped with precise geometry to receive the inlay or onlay. The preparation is more conservative than for a crown.
A detailed impression or digital scan of the prepared cavity is taken and sent to the laboratory. A temporary restoration is placed to protect the tooth.
A certified dental technician fabricates the inlay or onlay from ceramic (E-max, zirconia, or pressed porcelain) using CAD/CAM technology for a precise fit. Fabrication takes 3–5 working days.
The restoration is seated on the tooth to check fit, contact with adjacent teeth, bite, and aesthetics. Any minor adjustments are made before bonding.
The inlay or onlay is permanently bonded with a high-strength dental resin cement, then polished to integrate seamlessly with the natural tooth surface.
2
Visits
6
Days stay
No extended healing — restoration is complete after bonding appointment
Healing
Consultation, X-ray review, local anesthesia, cavity preparation, impression or digital scan, temporary restoration placed.
Ceramic inlay or onlay milled or pressed to precise dimensions, characterised and glazed. Typical laboratory turnaround 3–5 working days.
Temporary removed, inlay or onlay tried in, bite checked, adhesive bonding completed, polished to final finish.
Ceramic inlays and onlays are harder and more wear-resistant than composite resin, lasting 15–20 years compared to 7–10 for composite fillings.
Less healthy tooth material is removed compared to a crown preparation, making inlays and onlays the most conservative indirect restoration available.
Laboratory fabrication allows a far more precise fit and contact point than a directly placed filling, reducing the risk of secondary decay at margins.
Ceramic materials resist staining from coffee, tea, and wine far better than composite resin, maintaining their appearance over years of use.
The precisely shaped restoration fully restores the tooth's anatomy and bite, distributing chewing forces correctly across the tooth.
Unlike a direct filling, an inlay or onlay requires at least two appointments with a laboratory fabrication period in between, requiring a slightly longer trip or two visits.
Ceramic inlays and onlays can fracture under severe impact or in patients with unmanaged bruxism. A night guard is recommended for teeth grinders.
The laboratory fabrication stage makes inlays and onlays more expensive than direct composite fillings, though still significantly cheaper than crowns.
Mild temperature sensitivity while wearing the temporary restoration is common and resolves after the permanent bonding appointment.
Avoid sticky or very hard foods while the temporary is in place. Do not floss forcefully through the contact, as this may dislodge the temporary.
Avoid very hard foods for 24 hours. The cement reaches full strength within 24 hours of placement.
Brush twice daily and floss around the restoration daily. Ceramic margins seal better than composite but still benefit from meticulous hygiene.
If you grind or clench your teeth, wear a custom occlusal splint to protect the ceramic from fracture under parafunctional forces.
Have the inlay or onlay inspected at your 6-month dental checkups. Early identification of marginal issues or microcracks allows for preventive intervention.
An inlay or onlay requires two visits over 4–6 days: preparation and temporisation on day one, permanent bonding on day 4–6. This fits well into a combined dental and city tourism itinerary in Eastern Europe.