Table 2. Polymicrobial infection-induced periodontal intrabony defects in ApoEnull mouse.
| Jaw/Surfaces | Poly-microbial Infection | Sham-infected Control |
| Maxilla | 58/90* a (64.44%)** b | 19/60 (31.67%) |
| Mandible | 38/90 (42.22%) | 8/60 (13.33%) |
| Buccal | 38/90 (42.22%) | 11/60 (18.33%) |
| Palatal | 58/90 (64.44%) | 16/60 (26.67%) |
| Total | 96/180 (53.33%) | 27/120 (22.5%) |
*
aThe frequency was calculated by tooth surfaces containing periodontal intrabony defects out of total tooth surfaces. Calculation of total tooth surface: polymicrobial-infected group has 90 tooth surfaces [15 mice×3 molars×2 sides (buccal, palatal)] and control has 60 (10 mice×3 molars×2 sides).
**
bNumbers in the parenthesis indicate the percentage of tooth surface with periodontal intrabony defects.