Table 1.

The criteria for severe malocclusions (Treatment Priority Index [TPI] 8–10)

Malocclusion	Criteria	TPI
Traumatic deep bite	Lower incisors are in contact with palatium	8
Severe crowding	Crowding of at least one upper canine in one dental arch	8
Mandible retrognatia	Horizontal overjet is at least 8 mm	8
Anterior crossbite	Crossbite in the anterior teeth	8
Posterior crossbite	Crossbite in the posterior teeth	8
Jaw asymmetry	Severe asymmetry of the upper and/or lower jaw (asymmetry of >5 mm of the midline or on the occlusal plane)	8
Mandible prognatia	Skeletal prognatia of mandible with anterior crossbite	8
Maxilla retrognatia	Skeletal retrogatia of maxilla with anterior crossbite	8
Hypodontia	Hypodontia of one to six teeth causing severe occlusal problems	8
Maxilla prognatia	Horizontal overjet is at least 8 mm	8
Scissors bite	Scissors bite in several teeth	8
Impacted tooth	One or several impacted canines or incisors	8
Open bite	Severe open bite with maximum molars and second premolars in contact	8
Oligodontia	Missing at least seven teeth	9
Syndrome	Syndrome affecting face and or dentition (hemifacial microsomia, etc.)	8–10
Trauma	Trauma that has affected face/occlusion severely	8–10