The arch perimeter~~~~ is a line drawn from the distal surface of the first permanent molar around the arch over the contact points and incisal edges in a smooth curve to the distal surfaces of the first permanent molars on the opposite side
The arch length a line was drawn from a point midway to the central incisors perpendicular to the tangent touching the distal surfaces of the first permanent molars
Tooth Size Discrepancies and Arch Parameters among Different Malocclusions in a Jordanian Sample
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