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Table 1 Normal values for the five reference lines [ 1 - 6 ]

From: Sagittal lip positions in different skeletal malocclusions: a cephalometric analysis

Reference lines Sushner’s S2 line Burstone’s B line Steiner’s S1 line Holdway H line Ricketts E line
Normal values in mm Female 3.5 ± 1.4 UL Lips should touch the reference line LL should touch the reference or line −1 to +2 3 to 4 UL
−2 LL
 8.8 UL 2.2 ± 1.6 LL
 6.7 LL
Male
 10.3 UL
 7.8 LL
  1. UL, upper lips; LL, lower lips.