Research Article
Risk Factors of Composite Attachment Loss in Orthodontic Patients during Orthodontic Clear Aligner Therapy: A Prospective Study
Table 2
Univariate analysis of influencing factors of attachment loss.
| | Factors | No. of cases (attachments) | Attachments | Rate (%) | χ2 value | value | | Lost | Retained |
| | Gender | | | | | 0.432 | 0.566 | | Male | 27 (366) | 14 (25) | 13 (341) | 51.9 (6.8) | | | | Female | 67 (1031) | 40 (69) | 47 (962) | 59.7 (6.7) | | Attachment amount | | | | | 0.009 | 1.000 | | ≤ 15 | 50 (631) | 28 (51) | 22 (580) | 56.0 (8.1) | | | | >15 | 44 (766) | 26 (43) | 18 (723) | 59.1 (5.6) | | Eat with aligners | | | | | 5.029 | 0.034 | | Yes | 40 (601) | 18 (28) | 22 (576) | 45.0 (4.7) | | | | No | 54 (796) | 36 (66) | 18 (760) | 66.7 (8.3) | | | | Time per day | | | | | 6.237 | 0.014 | | <18 hours | 46 (668) | 32 (58) | 14 (610) | 69.6 (8.7) | | | | ≥ 18 hours | 48 (729) | 22 (36) | 26 (693) | 45.8 (4.9) | | Removal frequency | | | | | 8.524 | 0.005 | | <5 times | 66 (1020) | 32 (65) | 34 (955) | 48.5 (6.4) | | | | ≥ 5 times | 28 (377) | 22 (29) | 6 (348) | 78.6 (7.7) | | Aligner tray seaters | | | | | 7.754 | 0.006 | | Yes | 63 (925) | 31 (73) | 22 (852) | 49.2 (7.9) | | | | No | 31 (472) | 13 (21) | 18 (451) | 41.9 (4.5) | | Removal method | | | | | 0.015 | 1.000 | | From buccal | 43 (651) | 24 (40) | 19 (611) | 55.8 (6.1) | | | | From lingual | 51 (746) | 30 (54) | 21 (692) | 58.8 (7.2) | | | | Masticatory habits | | | | | 10.376 | 0.002 | | Unilateral | 54 (818) | 37 (58) | 28 (760) | 68.5 (7.1) | | | | Bilateral | 40 (579) | 17 (36) | 23 (573) | 42.5 (6.2) |
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