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Criteria of radiographic examination
| Periapical radiolucency | 1 (2.8%) |
| Widened PDL space | 1 (2.8%) |
| Furcation involvement | 0 (0.0%) |
| Vertical or horizontal bone loss | 2 (5.6%) |
| Large-sized crown | 5 (13.9%) |
| Marginal gap | 0 (0.0%) |
| Interference with the eruption of an adjacent tooth | 4 (11.1%) |
