Fig. 1

Occlusal abnormalities and radiographic findings. a Endoscopic intraoral view on the occlusal surface of the upper left cheek tooth 209. White lines highlight the mesial (mI) and distal infundibulum (dI) along occlusal infundibular enamel folds. Normal colour appearance of dI and darkly discolored mesial infundibular cement of mI indicative for infundibular caries grade 1/(0–4). Both infundibula show a small occlusal opening in cementum (arrowheads) representing a developmental remnant of occlusal blood supply. Pulp horn 3 (upper asterisk) and 4 (lower asterisk) show occlusal dentinal defects. A fissure fracture line extends from peripheral enamel to dentine at pulp position 4 (arrow). b Dental radiograph showing left upper cheek teeth 206-211 and not readily assigned soft tissue dense structures (asterisks). c Enlarged view of tooth 209 showing radiolucency in the area of the mI (arrowhead) and apical tooth substance (asterisks), as well as periapical/ interalveolar bone sclerosis and thickening (arrows)