American Board of Orthodontics (ABO) Practice Exam

An impacted upper central incisor is most likely associated with an impacted upper canine. This association is primarily due to the developmental relationships between these teeth. The upper central incisors emerge earlier in the dental development timeline, while the canines typically emerge later. If the canine is impacted, it can prevent the normal development and eruption of adjacent teeth, including the central incisor.

In cases where there is an anomaly in the position or development of the upper canines, it can lead to complications that affect the eruption path of the central incisors. This is often seen in orthodontic practice, where the presence of one impacted tooth can predict or be associated with the impaction of another due to the limited space and interactions among the developing teeth.

This association differs from the other options because, while impacted lateral incisors or transpositions can occur, they are not as commonly or directly linked to an impacted central incisor as the impacted canine. The relationship is more about the shared developmental pathways and spatial interdependence observed in many orthodontic scenarios.