Inlays and Onlays

What are inlays and onlays?

Inlays and onlays are dental restorations that are more extensive than dental fillings but less so than caps and crowns. They are typically formed in a dental lab and are made of gold, porcelain or resin depending on the patient’s needs and aesthetic goals.

An inlay refers to a restoration that is formed to fit the center of a tooth, whereas an onlay refers to a restoration that encompasses at least one cusp of the tooth. Both inlays and onlays are bonded to the surface of damaged teeth and matched to the color of the surrounding teeth.

How are they applied?

Inlays and onlays require two appointments to complete the procedure. During the first visit, the filling being replaced or the damaged or decaying area of the tooth is removed, and the tooth is prepared for the inlay or onlay. To ensure proper fit and bite, an impression of the tooth taken, and sent to a lab for fabrication. Our doctors will then apply a temporary sealant on the tooth and schedule the next appointment.

At the second appointment, the temporary sealant is removed. Our doctors will then make sure that the inlay or onlay fits correctly. If the fit is satisfactory, the inlay or onlay will be bonded to the tooth with a strong resin and polished to a smooth finish.

Considerations

Traditional fillings can reduce the strength of a natural tooth by up to 50%. As an alternative, inlays and onlays, being bonded directly onto the tooth using special high-strength resins, can actually increase the strength of a tooth by up to 75%. As a result, they can last from 10 to 30 years. In some cases, where the damage to the tooth is not extensive enough to merit an entire crown, onlays can provide a very good alternative.