A very cosmetically appealing option to repair a back tooth that is missing a significant amount of tooth structure is a “ceramic” or porcelain onlay. These types of restorations are a strong restorative option and have a high esthetic appeal due to the strong resemblance to natural tooth due to the translucency of porcelain.
Composite fillings are a mixture of glass or quartz filler in a resin medium that produces a tooth-colored filling. They are sometimes referred to as composites or filled resins. Composite fillings provide good durability and resistance to fracture in small-to-mid size restorations that need to withstand moderate chewing pressure. Less tooth structure is removed when the dentist prepares the tooth, and this may result in a smaller filling than that of an amalgam. Composites can also be "bonded" or adhesively held in a cavity, often allowing the dentist to make a more conservative repair to the tooth.