[Clinical study on bi-rooted primary canines].

OBJECTIVES: The incidence and clinical characteristics of bi-rooted primary canines were investigated by performing oral panoramic radiographs. METHODS: A total of 100 976 oral panoramic radiograph of subjects aged 3-9 years old were collected, and the incidence and distribution of bi-rooted primary canines were observed and recorded. The obtained data were analyzed using SPSS 25.0 statistical software, and the literature on bi-rooted primary canine was reviewed to record patient's data. RESULTS: =0.014). CONCLUSIONS: Bi-rooted primary canines are rare, mostly occur in 1-2 teeth, and are more common in males than females, in the upper jaw than in the lower jaw, and on both sides than on one side.