Table 2 Type of first failure for the mandible
.016″ × .022″ braided SS (N = 47) | .027″ TMA (N = 41) | Total for both retainers (N = 88) | |||||
|---|---|---|---|---|---|---|---|
Male (N = 12) | Female (N = 35) | Total (N = 47) | Male (N = 13) | Female (N = 28) | Total (N = 41) | ||
0: intact bonding | 5 | 14 | 19 (40.4%) | 5 | 20 | 25 (61%) | 44 (50%) |
1: full retainer out and rebonded | 1 | 0 | 1 | 3 | 2 | 5 | 6 (6.8%) |
2: fracture | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0%) |
3: detachment | 0 | 10 | 10 | 4 | 3 | 7 | 17 (19.3%) |
4: composite damage | 5 | 11 | 16 | 1 | 3 | 4 | 20 (22.7%) |
5: retainer replaced by a new retainer | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0%) |
6: no retainer in situ at T3 | 1 | 0 | 1 | 0 | 0 | 0 | 1 (1.1%) |
7: multiple types of failures at the same time | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0%) |
Total failures per type of retainer | – | – | 28 (59.6%) | – | – | 16 (39%) | – |
Total failures for both retainers | 44 (50%) | ||||||