Traditional dental restoratives, or fillings, may include gold, porcelain, and composite. Newer dental fillings include ceramic and plastic compounds that mimic the appearance of natural teeth. These compounds, often called composite resins, are usually used on the front teeth where a natural appearance is important. There are two different kinds of fillings: direct and indirect. Direct fillings are fillings placed immediately into a prepared cavity in a single visit. Indirect fillings generally require two or more visits. They include inlays, onlays, veneers, crowns, and bridges fabricated with gold, base metal alloys, ceramics, or composites.