Onlays

When more than half of the tooth's biting surface is damaged a dentist will often use an inlay or onlay.

What are inlays and onlays?

Inlays and onlays can be made of porcelain, gold, or composite resin. These pieces are bonded to the damaged area of the tooth. An inlay, which is similar to a filling, is used inside the cusp tips of the tooth. An onlay is a more substantial reconstruction, similar to the inlay but extending out over one or more of the cusps of the tooth.

Traditionally, gold has been the material of choice for inlays and onlays. In recent years, however, porcelain has become increasingly popular due to its strength and color, which can potentially match the natural color of your teeth.

How are inlays and onlays applied?

Inlays and onlays typically  require two appointments to complete.  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 is made by the dentist, and sent to a lab for fabrication. The dentist will then apply a temporary sealant on the tooth and schedule the next appointment.

At the second appointment, the temporary sealant is removed and the Inlay or onlay fit is confirmed.  The inlay or onlay is then bonded to the tooth with a strong resin and polished to a smooth finish.
 
With the advent of CAD/CAM technology we can now make inlays and onlays in one visit. This saves you the time required for a second visit and the need for more anesthesia.  See the Cerec crowns section for more information.
 
Considerations for Inlays and Onlays
 
Large Traditional fillings can reduce the strength of a natural tooth by up to 50 percent. As an alternative, inlays and onlays, which are bonded directly onto the tooth using special high-strength resins, can actually increase the strength of a tooth by up to 75 percent. As a result, they can last longer than fillings. In some cases, where the damage to the tooth is not extensive enough to merit an entire crown, onlays can provide a excellent alternative.