This equipment measures how well the joint functions while in motion. This is accomplished by placing headphones over the joints and recording the vibrations of either soft tissue (quiet, when disc is working properly) or movement of the articular joint cartilage. Sonography provides us with a picture on the extent of health or disease that is present in the joint. This instrument measures and analyzes the electrical activity in the muscles that move the jaw at rest and during function. In health, muscles rest with low levels of electrical activity and function with high levels of balanced activity. EMG is a painless test, which is performed using surface electrodes, like band-aids on the face, forehead, side of the head and beneath the chin. T-Scan II is a computerized timing and force evaluation of occlusion. The sensor is placed in the patient's mouth using a special handle. As the patient bites on the ultra-thin sensor, the T-Scan II software dynamically scans and displays the occlusion on a computer screen. The timing and force of the tooth contacts are shown in easily understandable color-coded contour images. We rely heavily on TOMOGRAPHIC xrays. These allow us to take "slices" at certain angles of the temporomandibular joint when the jaw is at rest, or the jaw is clenching or when the jaw is wide open. Changes to the bones of the Temporomandibular joint such as osteo-degeneration, arthritis or fractures.