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Reasons for the single crown failures
| Failure | Frequency | (%) |
|---|---|---|
| Loss of retention | 61 | 26.5 |
| Tooth loss | 31 | 13.5 |
| Tooth fracture | 29 | 12.6 |
| Replace old crown by new one due to change situation | 25 | 10.9 |
| Recurrent caries | 20 | 8.7 |
| Periapical destruction | 17 | 7.4 |
| Excessive bone loss | 11 | 4.8 |
| Major chipping | 8 | 3.5 |
| Mobility | 8 | 3.5 |
| Loss of tooth vitality | 7 | 3.0 |
| Esthetic dysfunction | 6 | 2.6 |
| Framework fracture | 4 | 1.7 |
| Tooth loss unknown reason | 2 | 0.9 |
| Poor fitting | 1 | 0.4 |
| Total | 230 | 100 |
