Why do we perform cavo surface bevelling when restoring with composite resins?

Cavo surface bevelling is primarily performed to enhance the aesthetic outcome of composite restorations. This technique involves creating a beveled edge at the cavosurface margin, which allows for a smoother transition between the tooth structure and the restoration. This transition helps to create a more natural appearance by blending the composite material with the surrounding tooth enamel.

While aesthetic reasons are significant, bevelling also contributes to other important factors. Increasing the surface area for retention helps ensure that the restoration remains securely in place due to greater adhesion. Minimizing sensitivity in prepared teeth can be another reason for this technique, as it can reduce sharp transitions that might lead to discomfort. Additionally, improving the bonding strength of the materials is crucial to the long-term success of a restoration, as a better bond reduces the likelihood of failure.

Thus, while aesthetics is a key aspect of cavo surface bevelling, the practice supports multiple beneficial outcomes, including retention, sensitivity management, and bonding strength, contributing to the overall success of the composite restoration.