When more than half of the tooth’s biting surface is damaged a dentist will often use inlays/onlays.
WHAT ARE INLAYS/ONLAYS? Inlays and onlays can be made of porcelain, gold, or a 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/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 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 and sent to a lab for fabrication. We will then apply a temporary sealant on the tooth and a subsequent appointment will be scheduled.
At the second appointment, the temporary sealant is removed. Your dentist will then make sure that the inlay/onlay fits correctly. If the fit is satisfactory, the inlay/onlay will be bonded to the tooth with a strong resin and polished for a smooth finish.
CONSIDERATIONS FOR INLAYS AND ONLAYS Traditional fillings can reduce the strength of a natural tooth by up to 50%. As an alternative, inlays/onlays that are 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 dental crown, onlays can provide a very good alternative.
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