Table 2.
Clinical Characteristics of Included Patients
| D & Cl parametersa |
>2 mm OIEARR* Patients (n = 174) |
None or <2 mm Root Resorption (n = 198) |
P Value** |
OR |
95% CI for OR |
|
| Mandibular |
Maxillary |
|||||
| Mean age (y) | 28.48 ± 13.60 | 26.2 9 ± 13.66 | .670 | 0.965 | 0.971 | 1.019 |
| Sex, n (%) | .350 | 0.791 | 0.484 | 1.293 | ||
| Female | 104 (59.77) | 115 (58.08) | ||||
| Male | 70 (40.22) | 83 (41.91) | ||||
| Angle classification, n (%) | .528 | – | – | – | ||
| Class I | 62 (35.63) | 94 (47.47) | .299 | 0.753 | 0.441 | 1.286 |
| Class II | 92 (52.87) | 83 (41.91) | .423 | 0.706 | 0.301 | 1.656 |
| Class III | 20 (11.49) | 21 (10.60) | ||||
| Treatment, n (%) | .576 | 0.822 | 0.414 | 1.634 | ||
| Extraction | 46 (26.43) | 49 (24.74) | ||||
| Nonextraction | 128 (73.56) | 149 (75.25) | ||||
| Type of appliance | ||||||
| Removable aligners | 84 | 75 | .002* | 2.097 | 1.301 | 3.382 |
| Fixed appliances | 90 | 123 | ||||
| Treatment time (mo) | 30.73 ± 12.37 | 29.56 ± 11.64 | .580 | 1.006 | 0.985 | 1.027 |
| ABO Discrepancy Index | 16.06 ± 9.48 | 13.49 ± 8.2 | .019* | 1.031 | 1.005 | 1.058 |
| Vertical movement | ||||||
| Intrusion | 142 (38.2%) | 230 (61.8%) | .180 | 1.640 | 0.796 | 3.380 |
| Extrusion | 172 (46.7%) | 196 (53.3%) | .152 | 1.697 | 0.824 | 3.498 |
| Apical displacement (absolute) | ||||||
| Vertical (mm) | 2.8 ± 2.32 | 2.58 ± 2.03 | .052 | 1.110 | 0.999 | 1.233 |
| Sagittal (mm) | 3.4 ± 1.91 | 2.33 ± 1.69 | .001** | 1.430 | 1.251 | 1.634 |
a
D & Cl indicates diagnostic and clinical factors; OIEARR, orthodontically induced external apical root resorption.
*
At least one maxillary incisor; ** conditional backward binary logistic regression analysis. Dependent variable = control vs >2 mm OIEARR patients.