Fig. (2a, b) Arch length measurements made on the digital models using OrthoAnalyzerTM 3D software. Segment A is the distance from the mesial contact point of the right first permanent molar to the mesial contact point of the right canine. Segment B is the distance from the mesial contact point of the right canine to the mesial contact point of the right central incisor. Segment C is the distance from the mesial contact point of the left central incisor to the mesial contact point of the left canine. Segment D is the distance from the mesial contact point of the left canine to the mesial contact point of the left first permanent molar.