The use of biomaterials may be an option for the treatment mainly of chin deficiencies. One of the most used materials is silicone prostheses. However, some problems with this material were observed, mainly the bone resorption by compression of the musculature, generating intense resorption, as detected in this described clinical case, where fracture of the jaw could occur. Prosthesis removal, chin osteotomy and reconstruction with an allogeneic graft were performed.