Fig. 1.
From: Evaluation of open bite closure using clear aligners: a retrospective study
Angular measurements (°). A, U1-SN′: angle between SN′ and long axis of upper incisor; B, IMPA: angle between Go-Me and long axis of lower incisor; C, SN′-MP: angle between SN′ and MP (Go-Me); D, ANB: angle between N-A and N-B. Linear measurements (mm). 1, UI length: distance from upper incisor tip to apex; 2, LI length: distance from lower incisor tip to apex; 3, PFH: shortest distance from S-Go; 4, AFH: shortest distance from N-Me; 5, U1-SN′: distance from tip of upper incisor to SN′; 6, L1-MP: distance from lower incisor tip to MP; 7, U1-SN′perp: distance from tip of upper incisor to SN′perp; 8, L1-MPperp: distance from lower incisor tip to MP perp; 9, U6-SN′: distance from upper molar MB cusp to SN′; 10, L6-MP: distance from lower molar MB cusp to MP; 11, U6-SN′perp: distance from tip of upper molar MB cusp to SN′perp; 12, L6-MPperp: distance from lower molar MB cusp to MPperp; overbite: distance from tip of U1 to tip of L1 perpendicular to SN′perp; overjet: distance from tip of U1 to tip of L1 perpendicular to SN′