Certain activities of the stomatognathic system take place without purpose and are called parafunctions. These activities affect a large number of people and can lead to symptoms and signs of disorders of the stomatognathic system, including trauma on teeth, TMJ, periodontium and masticatory muscles. Timely detection of symptoms and signs of damage and parafunctional activities is necessary to prevent serious damage. Prosthetic rehabilitation of patients with parafunction presents a challenge for any therapist due to the usually strong wear of the teeth and the reduced amount of remaining dental structure and the loss of the vertical dimension of the occlusion. Fixed prosthetic therapy includes detailed anamnesis and thorough planning, setup and analysis in the articulator, waxing of diagnostic models (wax-up) and transmission of the situation in the mouth (mock-up), preparation of temporary work that raises VDO and after the adaptation period follows setting the final work in the patient's mouth. Finally, a night splint is required for longevity.