Table 2 Wear volume of attachments during the follow-up period
From: Surface wear of attachments in patients during clear aligner therapy: a prospective clinical study
Time | Attachment volume (mm3) | Wear volume (mm3) | Wear volume (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|
Mean ± SEM | Median (Q1, Q3) | P value | Mean ± SEM | Median (Q1, Q3) | P value | Mean ± SEM | Median (Q1, Q3) | P value | |
T1 | 6.205 ± 0.144 | 6.565, (4.475,7.615) | 0.003** | – | – | – | – | – | – |
T2 | 5.920 ± 0.143 | 6.619, (4.233,7.301) | 0.284 ± 0.019 | 0.194, (0.096,0.396) | < 0.001*** | 5.10 ± 0.38 | 3.34, (1.64,6.69) | < 0.001*** | |
T3 | 5.722 ± 0.141 | 6.020, (4.045,7.063) | 0.483 ± 0.022 | 0.411, (0.259,0.635) | 8.52 ± 0.42 | 7.16, (4.37,11.26) | |||
T4 | 5.516 ± 0.138 | 5.750, (3.885,6.830) | 0.689 ± 0.028 | 0.587, (0.409,0.853) | 12.01 ± 0.52 | 12.01, (7.01,15.07) | |||
T5 | 5.280 ± 0.137 | 5.485, (3.668,6.626) | 0.925 ± 0.032 | 0.813, (0.586,1.190) | 16.20 ± 0.62 | 13.72, (10.24,19.77) | |||