Table 8. Number of mechanical and biological complications during periodic observation.
| Complications (n) | SCRP | BSRP | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Bl | 3 mo | 6 mo | 12 mo | Bl | 3 mo | 6 mo | 12 mo | ||
| Mechanical | Screw loosening | - | - | - | - | - | 3 | 1 | 7 |
| Screw fracture | - | - | - | 2 | - | - | 1 | - | |
| Implant fracture | - | - | - | - | - | - | - | - | |
| Prosthesis fracture | - | - | - | - | - | - | - | - | |
| Decementation | - | - | - | - | - | - | - | - | |
| Biological | Peri-implantitis | - | - | - | - | - | - | - | - |
| Impaction of food debris | - | 1 | 1 | - | - | 2 | 1 | 1 | |
| More than 1.5 mm crestal bone loss | - | - | - | - | - | - | - | - | |
| Suppuration | - | - | - | - | - | - | - | - | |
| Gingivitis | - | - | - | - | - | - | - | - | |
SCRP, screw- and cement-retained prosthesis; BSRP, ball- and spring-retained prosthesis; Bl, baseline; 3 mo, 3 months; 6 mo, 6 months; 12 mo, 12 months.