Fig. 2

Construction of border movement area. The protrusion upper border was determined on the radiograph using the measurement maximum retrusion (point 1) and maximum protrusion (point 2). The curved posterior border in the first phase of the condyle rotation up to 25 mm opening (red area of arch) (points 1–3), and then rotation and translation up to 50 mm opening (points 3–4). The anterior curve of the diagram an arch passing by points 2 and 4 (Fig. 2) with radius at the condyle at maximum advancement. The final simplified border movement area is shown in yellow