Fig. 3

Relationship between the detection of tonsilloliths on CT and the extent of the bone defect caused by periodontitis on panoramic radiographs in the 60s age group. a Axial CT images at the palatine tonsillar level showing a tonsillolith in a 63-year-old male patient. b Panoramic radiographs showing a severe bone defect caused by periodontitis in the same patient of Fig. 3a. c Axial CT images at the palatine tonsillar level showing no tonsillolith in a 63-year-old female patient. d Panoramic radiographs showing almost no bone defect caused by periodontitis in the same patient of Fig. 3c