Table 2 Characteristics of study upper incisors
Characteristics | Value/Number |
|---|---|
Ipsilateral premolar extraction | 57 (32.9%) |
Upper molar distalization | 99 (57.2%) |
Separate anterior and posterior tooth movement | 106 (61.3%) |
Power Ridge or attachments on incisors | |
 Power Ridge | 127 (73.8%) |
 Optimized attachment | 24 (14.0%) |
 None | 21 (12.2%) |
Attachments on ipsilateral canines | |
 Vertical rectangular attachment | 70 (43.8%) |
 Optimized attachment | 43 (26.9%) |
 Horizontal rectangular attachment | 24 (15.0%) |
 None | 23 (14.4%) |
Labial mini-implants | 22 (12.7%) |
Class II elastics used during molar distalization | 50 (28.9%) |
Dental anatomic characteristics | |
 Positive crown-root angle | 103 (64.8%) |
 Absolute value of crown-root angle (°) | 177.0 ± 2.9 |
 Labial surface-axis angle (°) | 20.6 ± 3.5 |
 Crown-root ratio | 0.9 ± 0.2 |
 Height of labial alveolar bone (mm) | 2.4 ± 2.3 |
 Height of palatal alveolar bone (mm) | 1.4 ± 0.8 |