A prosthesis is nothing but a proxy for something missing which essentially gives the same look, feel and texture as the real part. In maxillofacial prosthesis, this principal is used to help treat patients with birth defects or acquired defects due to trauma or other medical conditions.
It is usually used to fill in the missing bone, teeth or tissues which can in turn help regain or gain functionalities that are basic to the oral cavity, such as swallowing, chewing, or other cosmetic purposes