Ahn SY, et al. - An inquiry was set up with regard to the long-term (over 3 years) follow-up results of teeth that exhibited contradictory results between the pulp sensibility test (thermal or electric pulp test) and ultrasound Doppler flowmetry (UDF) until 1 year after trauma in order to gauge the prognosis of the pulp. It was reported that UDF could be effectively used for the assessment of pulpal status in traumatized teeth.