[Clinical investigation of orthodontic treatment of palatally impacted canines, using ballista spring appliance].

Impacted maxillary caries are often treated in the orthodontic practice. However palatally impacted maxillary canines occur in a small. They require active orthodontic traction in those cases in which surgical exposure alone will not be enough to erupt. The purpose of this article is to describe useful orthodontic treatment for the palatally impacted caries by using the ballista spring appliance. Case 1: A girl 12 years 5 months of age had Angle Class 1 malocclusion with anterior cross bite and crowding teeth. Case 2: A woman 28 years 2 month of age had Angle Class 1 malocclusion with crowding teeth. The results were as follows: 1. After the impacted canines retracted and guided into the dental arch in correct position, the condition of the canines and tissues around have been stabilized. 2. The ballista spring appliance was effective in pulling the palatally impacted maxillary canines forward vertical direction.