Schematic drawing of the jaw movement. A, Two cycles of the three-dimensional mandibular incisor-point chewing sequences. The three graphs indicate the tracing in the vertical (upper), anteroposterior (middle), and lateral (lower) axes. The dotted vertical line indicates the “turning point” between opening and closing of the mouth. B, Average chewing pattern in the frontal and horizontal view. Opening and closing angles in the frontal or horizontal view were defined as the angles between each plane and the tangent line of the average chewing trajectory.