Fig. 7From: Evaluation of cuspid cortical anchorage with different sagittal patterns using cone-beam computed tomography: a retrospective studyIdeal root control angle of maxillary cuspids to keep the roots detached from the labial bone cortex. β: the ideal root control angle; r = M2-D = ((A2-D)2 + (A2-M2)2) ½; l = 2πr × β/360 ≈ M2-IB2; and β ≈ (M2-IB2) × 360 / 2πrBack to article page