Retreatment with ultrasound. Case of retreatment with ukltrassom in which the presence of resin inside the root canal made its emptying difficult. The patient came to the endodontic specialization clinic with symptomatic apical periodontitis and a treated canal. During the emptying of the canal, there was great difficulty in the cervical third of the distal canal, due to the ... Continue reading Retreatment with ultrasound.