What Are Inlays and Onlays?

Inlays and onlays are custom-made restorations used to repair teeth that have moderate decay or damage, typically when the damage is too extensive for a simple filling but not severe enough to warrant a full dental crown. An inlay is designed to fit within the cusps (the bumps on the chewing surface) of a tooth, much like a puzzle piece. An onlay, sometimes called a partial crown, covers one or more cusps and extends over the biting surface of the tooth, providing more coverage than an inlay but less than a full crown.

When Are They Used?

Dentists recommend inlays and onlays when a tooth has suffered damage that compromises its structure but still retains a significant amount of healthy tooth material. This often occurs after removing a large old filling, or when decay has affected a substantial portion of the tooth. They are particularly beneficial for restoring strength and integrity to molars and premolars, which bear the brunt of chewing forces. By preserving more of the natural tooth structure, inlays and onlays are considered a more conservative restorative option compared to full crowns.

Materials and Procedure

Inlays and onlays can be crafted from various durable materials, including porcelain, composite resin, and gold. Porcelain and composite are popular choices for their aesthetic appeal, as they can be matched to the natural tooth color, making them virtually invisible. Gold, while less aesthetic, is highly durable and biocompatible. The procedure typically involves two appointments. During the first visit, the decayed or damaged portion of the tooth is removed, and an impression is taken. This impression is sent to a dental lab where your custom inlay or onlay is fabricated. A temporary restoration is placed to protect the tooth. In the second visit, the temporary is removed, and the permanent inlay or onlay is carefully bonded to your tooth, restoring its shape, function, and strength.

Benefits Over Fillings and Crowns

Compared to traditional fillings, inlays and onlays offer superior strength and longevity, as they are custom-made in a lab to fit precisely and are bonded securely to the tooth. This reduces the risk of fracture and further decay. When contrasted with full crowns, inlays and onlays require less removal of healthy tooth structure, making them a more conservative approach. They also help maintain the natural bite and can prevent the need for more extensive dental work in the future, ultimately preserving your natural smile and oral health for years to come.