Fig. 4From: Efficacy and safety of piezocision in accelerating maxillary anterior teeth en-masse retraction: study protocol for a randomized controlled trialCephalometric landmarks and indicators. S sella, N nasion, A subspinale, Ui upper incisor, Uir upper incisor root, Me menton, Go gonion, UL upper lip anterior, MP the mandibular plane, Ep the aesthetic plane, UL-Ep distance between UL and the aesthetic planeBack to article page