Measurement

Definition

U6-U6 (mm)

Intermolar width was measured as the distance between the right and left mesiolingual cusps of the first molars at the gingival margin

U5-U5 (mm)

Interpremolar maxillary arch width measured between the left and right secondpremolar at the gingival margin

U4-U4 (mm)

Interpremolar maxillary arch width measured between the left and right first premolar at the gingival margin

U3-U3 (mm)

Intercanine maxillary arch width measured between the left and right canines at the gingival margin