Fig. 2

Stage 2 FOD with concomitant endodontic periapical lesion on symptomatic tooth 37. Diffuse mixed (radiolucent and radiopaque) periapical lesions are depicted on panoramic radiography (a). High-resolution/small field of view cone-beam CT allows axial (b) and bucco-lingual cross-sections (c) highlighting the lack of endodontic treatments and unobturated mesio-lingual canal (white arrows) associated with voluminous peri-radicular mixed-density images. (d, d’) Following endodontic retreatment tooth 37 became asymptomatic but the 6 months post-operative intra-oral x-ray (d’) was unable to show usual signs of alveolar bone healing as compared to the preoperative x-ray (d) because of superimposed FOD lesions