INLAYS and ONLAYS are laboratory-fabricated restorations that repair significant decay or fractures. These partial crowns can also replace large amalgam fillings to restore an all-white, metal-free smile. Porcelain is the most common material of choice because of its strength and beauty. They can also be made from resin material or gold. Porcelain inlays and onlays can last 15 years or more with proper care. They also resist stains better than composite resin fillings.
What is the difference between an inlay and an onlay?
Inlays are designed for placement between tooth cusps, in the indented top surface of a tooth. Inlays fit over one or more cusps and can extend down the side of a tooth. The shape and size of your existing cavity, fracture, or filling will determine which restoration would work best for your situation.
Onlays allow to preserve more tooth structure than he would be able to save with a full crown. If decay is found early enough, onlays can prevent the need for more invasive treatments.