The shoulder margin is mainly used to:

The shoulder margin is primarily used to enhance aesthetic results in prosthetic dentistry. This type of margin involves a flat and smooth shoulder that helps to provide a clean and distinct transition between the restoration and the tooth structure. This design is particularly beneficial for anterior restorations where aesthetics are crucial, as it contributes to a more natural appearance of the crown or restoration.

A well-defined shoulder margin allows for a better adaptation of the crown to the tooth, which minimizes the visibility of the interface and can improve the overall visual appeal of the restoration. The aesthetics are further enhanced by the smooth finish, which reflects light in a way that can mimic the natural tooth structure.

While facilitating cementation, improving mechanical retention, and minimizing occlusal wear are important considerations in the design of prosthetic restorations, these factors are not the primary purpose of the shoulder margin. The main focus of this design is to achieve the best possible aesthetic outcome, especially in areas of the mouth that are prominently visible.