Posterior composite restorations refer to dental fillings placed on the chewing surfaces or sides of the back teeth (molars and premolars) using tooth-colored composite resin material. These restorations are a popular alternative to traditional amalgam (silver) fillings because they can be matched to the natural color of the tooth, providing a more aesthetically pleasing result.

Composite restorations are typically used for repairing teeth damaged by decay or trauma. The procedure involves removing the decayed or damaged portion of the tooth, preparing the tooth surface, and then applying layers of composite resin. Each layer is hardened with a special light, and the final restoration is shaped and polished to blend seamlessly with the surrounding teeth.

Benefits of posterior composite restorations include improved aesthetics, a more conservative tooth preparation compared to amalgam fillings, and the ability to bond the composite material directly to the tooth structure, which can provide additional support and reduce the risk of fractures.

It's important to note that the lifespan of composite restorations can vary depending on factors such as the size and location of the restoration, biting forces, oral hygiene habits, and individual variations. Regular dental check-ups and good oral care practices are essential for maintaining the longevity of posterior composite restorations.