What is the role of a wedge in a class II amalgam restoration?

In a Class II amalgam restoration, the purpose of a wedge is primarily to establish a proper contour of the restoration. This involves creating space in the interproximal area between the teeth, allowing for an appropriate marginal seal and enabling the dentist to contour the restoration to match the natural curvature of the tooth. Proper contour is essential not only for aesthetic reasons but also for the functionality of the tooth, including preventing food impaction and promoting gum health.

When the wedge is placed, it gently pushes the adjacent teeth apart, ensuring that the tooth can be restored effectively without compromising the contacts with the neighboring teeth. This separation helps create a tight fit and prevents any gaps that could lead to decay or other dental issues in the future. Therefore, establishing proper contour through the use of a wedge is crucial for the long-term success of the restoration.