fig1

Figure 1. A: Measurement of the height of the clinical crown; B: the border between the buccal and occlusal surfaces; C: the more prominent slope of the buccal cusp of the premolars (red arrows) and the central groove of the premolars and molars (blue arrows); D: the horizontal lines connecting the mesial and distal marginal ridges on the premolars and molars (red lead pencil); E: the two parallel lines on the molars: the first corresponding to the sulcus and the latter passing through the mesial cusp (red arrow); F: the horizontal line perpendicular to FACC and to the two vertical lines of the molars. FACC: facial axis of the clinical crown