Journal of the World federation of orthodontists · 2022
Evaluation of the effectiveness of modified aligner appliance with nickel-titanium springs in treatment of mild crowding of lower incisors: A randomized controlled clinical trial.
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Alhafi Ziad Mohamad, Rajeh Nada
Аннотация
BACKGROUND: This study aimed to evaluate the effectiveness of modified aligner appliances with nickel-titanium springs (MAAs) in treating mild mandibular crowding and assess the overall alignment treatment duration, alignment improvement percentage, and mandibular incisor proclination.
METHODS: This two-armed, parallel-group randomized controlled trial included 36 patients (7 men, 29 women) with mild mandibular incisor crowding according to Little's Irregularity Index. Patients were randomly assigned to two groups: the MAA group (mean age = 22.56 ± 3.50 years) and the conventional fixed bracket group (control group; mean age = 20.89 ± 2.90 years). The duration of alignment treatment of the lower anterior teeth was calculated. The progress of alignment was evaluated every 2 weeks on the study casts, which were taken at fixed intervals: pretreatment (T0) and 2 (T1), 4 (T2), 6 (T3), and 8 (T4) weeks after beginning the treatment. Change of mandibular incisor proclination was evaluated by measuring and comparing pretreatment and postalignment lateral cephalograms.
RESULTS: No statistically significant difference was detected between the two groups in terms of alignment treatment duration (P = 0.097), whereas a significant difference was observed in the alignment improvement percentage at T1 (P = 0.000), T2 (P = 0.001), and T3 (P = 0.022). In addition, the MAA group had a lower change of mandibular incisor proclination than the control group (P = 0.000).
CONCLUSIONS: The clinical application of MAAs may be effective in lower incisor decrowding, with a reduction in lower incisor inclination compared with conventional fixed brackets. This trial was registered at ClinicalTrials.gov (identifier: NCT04988373).
METHODS: This two-armed, parallel-group randomized controlled trial included 36 patients (7 men, 29 women) with mild mandibular incisor crowding according to Little's Irregularity Index. Patients were randomly assigned to two groups: the MAA group (mean age = 22.56 ± 3.50 years) and the conventional fixed bracket group (control group; mean age = 20.89 ± 2.90 years). The duration of alignment treatment of the lower anterior teeth was calculated. The progress of alignment was evaluated every 2 weeks on the study casts, which were taken at fixed intervals: pretreatment (T0) and 2 (T1), 4 (T2), 6 (T3), and 8 (T4) weeks after beginning the treatment. Change of mandibular incisor proclination was evaluated by measuring and comparing pretreatment and postalignment lateral cephalograms.
RESULTS: No statistically significant difference was detected between the two groups in terms of alignment treatment duration (P = 0.097), whereas a significant difference was observed in the alignment improvement percentage at T1 (P = 0.000), T2 (P = 0.001), and T3 (P = 0.022). In addition, the MAA group had a lower change of mandibular incisor proclination than the control group (P = 0.000).
CONCLUSIONS: The clinical application of MAAs may be effective in lower incisor decrowding, with a reduction in lower incisor inclination compared with conventional fixed brackets. This trial was registered at ClinicalTrials.gov (identifier: NCT04988373).