Electronic appliances for lower jaw movement registration include digital kinematic facebows that record mandibular movements when performed by the patient. The purpose of recording movements is twofold. In the diagnosis of temporomandibular disorders, such a record of mandibular movements enables the detection of joint irregularities or masticatory system dysfunction. Another purpose of recording mandibular movements in dental prosthetics can be seen in fabrication prosthetic replacements, especially in large prosthetic rehabilitations. Such replacements are fabricated in the articulator, and in order to make a prosthetic replacement as precise as possible, i.e. to fit it into the patient's occlusion, the articulator must imitate the patient's masticatory system as faithfully as possible. The lower jaw is connected to the other bones of the face and skull by a system of temporomandibular joints, ligaments and muscles. The system of the mentioned tissues enables lower jaw mobility in all directions in space. Each complex movement of the lower jaw can be divided into several simpler basic movements, and these movements include mouth opening and closing, forward-backward shift and left-right shift. Each kinematic facebow consists of an upper part that is mounted on the patient's head according to certain reference points. The lower part is mounted on the mandibular teeth and it moves in all directions together with the lower jaw. These movements are registered by a system of transmitters and sensors on the upper and lower parts of the device. The signals from the sensors are transferred to the computer and processed there. A graphic record of each movement is displayed on the screen, and the computer system also calculates several parameters of the patient's masticatory system, for example the angle of condylar path inclination, Bennett's angle, immediate side shift, the position of the terminal hinge axis, intercondylar distance, etc. These parameters are adjusted in the articulator, and such an individualized articulator can faithfully reproduce the patient's lower jaw movements.