Treatment of a 90 degrees apical curvature in a 1.5

Preop x-ray of a symptomatic 1.5 referred due to its apical complexity — 90 degrees apical curvature Preop limited FOV CBCT — patient was recommended to also evaluate previous endodontic treatment on teeth 1.6 and 1.7 Clinically, tooth 1.5 had an exacerbated response to percussion, with no response to the cold test. Teeth 1.6 and 1.7 presented no clinical signs. The preop CBCT showed a periradicular radiolucency on tooth 1.5, with an associated inflammatory response of the maxillary sinus mucosa. Teeth 1.6 and 1.7 had unsatisfactory root canal treatments but no periradicular pathology. A diagnosis was made for tooth 1.5 — pulp necrosis, localized symptomatic apical periodontitis — patient agreeing to a root canal treatment on it, postponing teeth 1.6…