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Fistula
Always trace a fistula with a gutta percha point. Generally, you can use a no. 30 cone or a fine-medium accessory point. Place the gutta percha point into the fistula and gently advance it until it stops. Cut off the end of the cone so that only a modest amount remains outside the fistula. This prevents the patient’s lip from dislodging the cone. Take a radiograph of the cone in the fistula. The x-ray will show the cone taking you to the source of the lesion. Also, remember to remove the cone from the fistula before you dismiss the patient.
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