TABLE 2.
Frequency distribution of plaque, calculus, gingival and bleeding indices and mean and standard deviation (SD) of probing depth in mm, at placement of the overdenture (T0), and 5 years (T60) and 10 years (T120) after placement of the overdenture, and significance level (p value) of differences between groups at three time points (p < .05 was considered significant)
| T0 | T60 | T120 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 4‐Implant group (n = 33) | 6‐Implant group (n = 33) | Sign | 4‐Implant group (n = 29) | 6‐Implant group (n = 31) | Sign | 4‐Implant group (n = 26) | 6‐Implant group (n = 20) | Sign | |
| Plaque index (%) | |||||||||
| 0 | 87.9 | 90.9 | 1.000 | 62.1 | 51.6 | .475 | 53.8 | 55.0 | .485 |
| 1 | 12.1 | 9.1 | 20.7 | 25.8 | 7.7 | 30.0 | |||
| 2 | 0 | 0 | 17.2 | 22.6 | 61.5 | 15.0 | |||
| 3 | 0 | 0 | 0 | 0 | 0 | 0 | |||
| Calculus index (%) | |||||||||
| 0 | 97.0 | 100 | 1.000 | 96.6 | 96.8 | 1.000 | 92.3 | 90.0 | .957 |
| 1 | 3.0 | 0 | 3.4 | 3.2 | 7.3 | 10.0 | |||
| Gingival index (%) | |||||||||
| 0 | 87.9 | 97.0 | .355 | 48.3 | 54.8 | .462 | 61.5 | 65.0 | .783 |
| 1 | 12.1 | 3.0 | 41.4 | 41.9 | 26.9 | 20.0 | |||
| 2 | 0 | 0 | 10.3 | 3.3 | 11.6 | 15.0 | |||
| 3 | 0 | 0 | 0 | 0 | 0 | 0 | |||
| Bleeding index (%) | |||||||||
| 0 | 72.7 | 72.3 | 1.000 | 51.7 | 38.7 | .268 | 46.1 | 45.0 | 1.000 |
| 1 | 24.3 | 27.3 | 37.9 | 41.9 | 42.3.9 | 40.0 | |||
| 2 | 3.0 | 0 | 10.4 | 19.4 | 11.6 | 15.0 | |||
| 3 | 0 | 0 | 0 | 0 | 0 | 0 | |||
| Probing depth in mm (SD) | 4.5 (0.8) | 4.1 (1.1) | .157 | 4.3 (1.0) | 4.2 (0.8) | .765 | 4.8 (1.1) | 4.2 (0.9) | .337 |