Aras 2018.
| Study characteristics | ||
| Methods | Setting: Ege University, Turkey Design: parallel (2 arms) No. of centres: 1 Study duration: 9 months |
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| Participants | Inclusion criteria: "Angle class I malocclusion, 4–10 mm of anterior crowding in both arches, 2–4 mm of overjet and overbite, complete permanent dentition except third molars, no evident root resorption in maxillary incisor teeth, no history of restorative or endodontic treatment of these incisors, no dilacerated incisor roots or peg laterals, no systemic diseases or periodic medications, and no history of previous orthodontic treatment." Exclusion criteria: not reported Participant sampling: N = 32 selected Group 1 (n = 16): 12 female, 4 male (mean age of 15.0 ± 1.03 years) Group 2 (n = 16): 10 female, 6 male (mean age of 14.94 ± 1.06 years) Sex: 22 female, 10 male Dropouts: not reported |
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| Interventions | Orthodontic intervention: fixed appliances and auxiliaries Self‐ligating brackets versus conventional brackets |
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| Outcomes | Loss of root volume in maxillary incisor teeth | |
| Notes | The number of teeth affected by root resorption Group 1: 4 teeth had palatal root resorption (6.25%); 4 teeth had proximal root resorption (6.25%) Group 2: 14 teeth had palatal root resorption (21.87%); 13 teeth had proximal root resorption (20.31%) |
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| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Random sequence generation (selection bias) | Unclear risk | Unclear method of randomisation |
| Allocation concealment (selection bias) | Unclear risk | Unclear if allocation sequence concealed from those assigning adolescents to participant groups |
| Blinding of participants and personnel (performance bias) All outcomes | High risk | Not possible to blind participants and personnel due to the different interventions used |
| Blinding of outcome assessment (detection bias) All outcomes | High risk | Quote: "Blinding was not possible due to the groups being potentially distinguishable via the bracket images" |
| Incomplete outcome data (attrition bias) All outcomes | Unclear risk | Dropouts not reported |
| Selective reporting (reporting bias) | Low risk | All outcomes reported |
| Other bias | Low risk | Quote: "Reproducibility of the measurements was high, with an ICC of 0.988 (95% confidence interval [CI] 0.0980–0.992)" |