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Table 1 Types of malocclusion and related diagnostic criteria

From: Prevalence of and factors affecting malocclusion in primary dentition among children in Xi’an, China

 

Types

Diagnosis criteria

Sagittal anomalies

Anterior crossbite

Recorded when the lower incisors or canines are in front of the corresponding upper teeth

Edge-to-edge occlusion

Recorded when the maxillary incisors and the corresponding mandibular incisors are occluded in an edge-to-edge status, without overbite or overjet

Increased overjet

Recorded when the distance from the most labial point of the incisal edge of the maxillary incisors to the most labial surface of the corresponding mandibular incisors is more than 3 mm, measured to the nearest 0.5 mm

Vertical anomalies

Open bite

Recorded when the upper and lower incisors are vertically separated regardless of the extent, without any overbite

Deep overbite

Recorded when the vertical overlap of the incisors, when the posterior teeth are in contact is more than two thirds covered or when the overlap is more than 3 mm, measured to the nearest 0.5 mm

Transversal anomalies

Posterior crossbite

Recorded when the buccal cusps of the maxillary molars occlude lingually to the buccal cusps of the mandibular antagonists in at least one pair of teeth, uni- or bilaterally. Teeth in an edge-to-edge position were also included

Midline deviation

Recorded when the position of the mandibular midline had a more than 2-mm discrepancy relative to the maxillary midline, with the posterior teeth in full occlusion