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Formation of the angles used for inclination assessment. α1 (right molar tipping angle) and α2 (left molar tipping angle), inner angles between the transversal occlusal line connecting the mesio-palatal cusp tips of the right and left molars and the lines passing through the mesio-buccal and mesio-palatal cusp tips of the molars. α3 (palatal tipping angle), inner angle between the right and left alveolar lines connecting the upper and lower alveolar tipping points on each side.
