Table 2.

Classification of anatomical types based on eight standard clinical measurement sets.^6,7

Methods	Type 1	Type 2	Type 3
(1) The angle between L5, L2, and L6 A point–nasion–B point angle (ANB)	3.2 deg to 5.7 deg	$>5.7$	$<3.2$
	Class I (normal)	Class II	Class III
(2) The angle between L1, L2, and L6 sella–nasion–B point angle (SNB)	74.6 deg to 78.7 deg	$<74.6\mathrm{deg}$	$>78.7\mathrm{deg}$
	Normal mandible	Retrognathic mandible	Prognathic mandible
(3) The angle between L1, L2, and L5 sella–nasion–A point angle (SNA)	79.4 deg to 83.2 deg	$>83.2\mathrm{deg}$	$<79.4\mathrm{deg}$
	Normal maxilla	Prognathic maxilla	Retrognathic maxilla
(4) ODI	68.4 deg to 80.5 deg	$>80.5\mathrm{deg}$	$<68.4\mathrm{deg}$
	Normal	Deep bite tendency	Open bite tendency
(5) APDI	77.6 deg to 85.2 deg	$<77.6\mathrm{deg}$	$>85.2\mathrm{deg}$
	Normal	Class II tendency	Class III tendency
(6) The ratio of posterior face height to anterior face height facial height index (FHI)	0.65 deg to 0.75 deg	$>0.75$	$<0.65$
	Normal	Short face tendency	Long face tendency
(7) The angle between L1, L2, and L9 frankfurt-mandibular plane angle (FMA)	26.8 deg to 31.4 deg	$>31.4\mathrm{deg}$	$<26.8\mathrm{deg}$
	Normal	Mandible high angle tendency	Mandible low angle tendency
(8) The distance between L12 and L11 modify-wits (MW)	2 mm to 4.5 mm	0 mm	$>4.5\mathrm{mm}$
	Normal	Edge to edge	Large over jet
		$<0\mathrm{mm}$
		Anterior cross bite