Table 3.
Correlation of the root resorption of second molars according to the stage of eruption of the lower M3 positions at T1
| Resorption—2nd molars | |||||||
|---|---|---|---|---|---|---|---|
| Variable | Present | Absent | Total | p value | |||
| n | % | n | % | n | % | ||
| • Stage of eruption | |||||||
| Erupted | – | – | 8 | 100.0 | 8 | 100.0 | p a = 0.005* |
| Partial erupted | – | – | 14 | 100.0 | 14 | 100.0 | |
| Full bone impacted | 10 | 37.0 | 17 | 63.0 | 27 | 100.0 | |
| Total | 10 | 20.4 | 39 | 79.6 | 49 | 100.0 | |
| • Pell and Gregory—T1 | |||||||
| IA | – | – | 17 | 100.0 | 17 | 100.0 | p a = 0.024* |
| IIA | 3 | 30.0 | 7 | 70.0 | 10 | 100.0 | |
| IB | 3 | 37.5 | 5 | 62.5 | 8 | 100.0 | |
| IIB | 1 | 11.1 | 8 | 88.9 | 9 | 100.0 | |
| • Winter—T1 | |||||||
| Horizontal | 5 | 55.6 | 4 | 44.4 | 9 | 100.0 | p a < 0.001* |
| Mesioangular | 5 | 38.5 | 8 | 61.5 | 13 | 100.0 | |
| Vertical | – | – | 20 | 100.0 | 20 | 100.0 | |
| Group total | 10 | 20.4 | 39 | 79.6 | 49 | 100.0 | |
Obs.: Relative risk was not determined due to the occurrence of zero or very low frequencies
n number of teeth
*Significant difference at 5 %
aFisher’s exact test