Fig. 1

Periodontitis inhibits bone regeneration after tooth extraction in patients. A–C CBCT data of patients with or without periodontitis were collected, and decreases in BARH (A), LARH (B), and ARW (C) were increased in periodontitis patients (n = 11), as compared with the healthy control group (n = 17). D CBCT data quantitative analysis showed that the new bone formation was significantly inhibited in periodontitis group (n = 11), as compared with the healthy control group (n = 17). E CBCT representative images showed that periodontitis patients had significantly worse new bone formation in extraction sockets than the control group (n = 11) (scale bar = 0.5 cm)