Transposition

When two adjacent teeth have exchanged their normal sequential order, the condition is called transposition.⁹ The teeth most frequently involved are the permanent canine and first premolar in which the premolar erupts anterior to the canine tooth (Figure 18).⁹ This condition is observed in the permanent dentition but is not seen in the primary dentition.⁹

Figure 18.

Figure 18.

Image courtesy of Dr. Christos Angelopoulos.

Cropped Cone Beam Computed Tomography (CBCT) panoramic reformat showing transposition of maxillary left first premolar #12 and impacted maxillary left canine #11.