Table 1.

Modified version of the Index of Orthodontic Treatment Need [22,33].

Missing teeth	Hypodontia requiring pre-restorative orthodontics or orthodontic space closure to obviate the need of a prosthesis.
	Impeded eruption of teeth, presence of supernumerary teeth, and retained deciduous teeth.
Overjet	Increased overjet greater than 6 mm.
	Reverse overjet greater than 3.5 mm with no masticatory or speech difficulties.
	Reverse overjet greater than 1 mm but less than 3.5 mm with recorded masticatory and speech difficulties.
Crossbite	Anterior or posterior crossbites with greater than 2 mm discrepancy between retruded contact position and intercuspal position.
Displacement of contact points (crowding)	Contact point displacements greater than 4 mm.
Overbite	Lateral or anterior open bites greater than 4 mm.
	Deep overbite with gingival or palatal trauma.