Fig. 1From: Predictability of lower incisor tip using clear aligner therapyMethod used to measure lower incisor tip: A diagrammatic drawing showing tooth movement as described with six degrees of freedom. The axes are orientated so that the x-axis represented mesio-distal (MD), the y-axis represented bucco-lingual (BL), and the z-axis represented occluso-gingival (OG) directions. B The CRes was placed at a set distance from the intersection of the crown mesh and the long axis of the tooth (black dot). Arbitrary points were also placed at set distances along the x, y and z axes. C The origin of the three axes at T1 reorientated to coincide with CRes of T0. D Tipping movement assessed as the rotation around the y (bucco-lingual)-axis was then calculated using trigonometryBack to article page