What is the purpose of using a wedge during a class II composite procedure?

Using a wedge during a class II composite procedure primarily serves to create space for the matrix band. In a class II cavity preparation, the matrix band is used to provide a temporary wall that helps to restore the shape of the tooth as well as prevent the composite material from flowing into adjacent spaces. A wedge is inserted to secure the matrix band snugly against the tooth structure, ensuring that the band fits tightly and preventing any gaps where composite material could ooze out.

The wedge also aids in maintaining proper contact points between the tooth being restored and the adjacent natural teeth, which is essential for both aesthetics and function. This tight contact helps to minimize the risk of food impaction and decay in the future.

While bonding and even pressure may play a role in the overall procedure, the primary and most direct purpose of the wedge is to ensure that adequate space is created for the proper placement of the matrix band, thus allowing for an accurate and effective restoration.