- May 30, 2013
They are molded to a precise fit and have a very realistic appearance. Onlays cover the entire surface of the damaged tooth and are used when a tooth is too decayed for regular fillings or inlays. When doing inlays or onlays the cavity of the teeth is prepared and a precise impression is taken , this impression is sent to the laboratory and a porcelain structure is fabricated , this structure is then cemented to the teeth .
When more than half of the tooth’s biting surface is damaged , the dentist will often use an inlay or onlay to correct the problem An inlay is done when the tooth structure replaced is within the cusp tips of the tooth. If the damage is more extensive and the new structure covers the entire chewing surface including one or more tooth cusps, the procedure is called an onlay
Inlays and onlays are applied in two dental visits. At the first visit, the old filling, or decay, is removed, and the tooth is prepared for the inlay / onlay. The dentist will then make an impression of the tooth, and send this impression to a dental laboratory. This impression will be used by the laboratory to construct a custom-made porcelain At this time the dentist will place a temporary sealant on your tooth and schedule a second appointment. At the second visit, the temporary sealant is removed. Your dentist will then ensure that the inlay fits properly in the tooth and does not interfere with your bite. The inlay/ onlay is then bonded into the tooth with a strong bonding resin, and polished smooth.
Traditional fillings can reduce the strength of a natural tooth by up to 50%. As an alternative, inlay and onlay, is bonded directly onto the tooth using special high-strength resins, can actually increase the strength of a tooth by up to 75%