It is the procedure by which the projection of the chin is modified either to increase or decrease it.
In the case of augmentation, we generally use a biocompatible silicone implant, which adapts very favorably achieving a natural appearance and in continuity with the facial skeleton. In some cases and when the correction or augmentation is one centimeter or more, we do not use an implant but a bone cut that allows us to move that part forward.
Similarly, when we want to reduce the projection of the chin, a bone cut is used with a backward displacement of the chin portion.