Table 2.
Distribution of the radiographic findings seen in panoramic images and CBCT
| Radiographic parameters | Panoramic imaging N (%) | CBCT N (%) |
|---|---|---|
| Bony coverage of M3 | ||
| No | 228 (87.7%) | 256 (98.5%) |
| Yes | 32 (12.3%) | 4 (1.5%) |
| Apical root closure of M3 | ||
| No | 58 (22.3%) | 80 (30.8%) |
| Yes | 202 (77.7%) | 180 (69.2%) |
| Angulation M3 | ||
| Vertical | 57 (21.9%) | 58 (22.3%) |
| Mesioangulation | 174 (66.9%) | 175 (67.3%) |
| Distoangulation | 26 (10.0%) | 18 (6.9%) |
| Other | 3 (1.2%) | 9 (3.5%) |
| Number of root(s) M3 | ||
| 1 | 96 (36.9%) | 73 (28.1%) |
| 2 | 12 (4.6%) | 49 (18.9%) |
| 3 | 150 (57.7%) | 121 (46.5%) |
| 4 or more | 2 (0.8%) | 17 (6.5%) |
| Enlarged follicular space M3 | ||
| No | 191 (73.5%) | 166 (63.8%) |
| Yes | 69 (26.5%) | 94 (36.2%) |
| Marginal bone loss of M2 | ||
| No | 51 (19.6%) | 32 (12.3%) |
| Yes | 209 (80.4%) | 228 (87.7%) |
| External Root resorption of M2 | ||
| No | 149 (57.3%) | 101 (38.9%) |
| Superficial ERR | 21 (8.1%) | 44 (16.9%) |
| ERR involving < Halfway through dentin | 50 (19.2%) | 70 (26.9%) |
| ERR involving ≥ Halfway through dentin | 40 (15.4%) | 45 (17.3%) |
| Bony separation between the sinus floor and M3 | ||
| No | - | 178 (68.5%) |
| Yes | - | 82 (31.5%) |
| Inclination of M3 | ||
| No | - | 150 (57.7%) |
| Buccal | - | 58 (22.3%) |
| Palatal | - | 52 (20.0%) |
ERR, external root resorption.; M2, maxillary second molar; M3, maxillary third molar.