A randomized clinical trial of the effectiveness of 0.018-inch and 0.022-inch slot orthodontic bracket systems: part 1 - duration of treatment

Yassir A. Yassir (Lead / Corresponding author), Ahmed M. El-Angbawi, Grant T. McIntyre, Gavin F. Revie, David R. Bearn

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Abstract

Summary Objective To compare treatment duration between 0.018-inch and 0.022-inch slot systems and determine factors influencing treatment duration. Subjects and methods Eligible participants aged 12 years or over were allocated to the 0.018-inch or 0.022-inch slot MBT appliance (3M-Unitek, Monrovia, California, USA) using block randomization in groups of 10. Outcome measures included duration of: 1. overall treatment, 2. levelling and alignment, 3. working and finishing, and 4. appointment numbers and other treatment-related factors. Parametric tests (independent samples t-test) and non-parametric tests (chi-square with Fisher's exact tests and Mann-Whitney U-test) assessed differences between groups. A multiple linear regression analysis identified factors influencing treatment duration (P < 0.05). Results Of the 187 participants randomized (1:1 ratio), 34 withdrew or were excluded (protocol deviations or poor cooperation). There were 77 patients in the 0.018-inch slot group and 76 patients in the 0.022-inch slot group (overall mean age: 19.1 years). Baseline characteristics were similar between groups (P > 0.05). The mean duration of treatment for the 0.018-inch and 0.022-inch slot groups was 29.3 and 31.2 months, respectively. There were no statistically significant differences between the two treatment groups in terms of treatment duration, duration of the key stages of treatment, and number of appointments (P > 0.05). The regression analysis revealed 33.0 per cent of variance in treatment duration was explained by age at bonding, Class II division 2 malocclusion, number of failed appointments, number of emergency appointments, and transfer to another clinician. There were no adverse events. Limitations It was impossible to blind clinicians or patients to allocation and oral hygiene and periodontal outcomes were not assessed. Conclusions There was no statistically or clinically significant difference in treatment duration between 0.018-inch and 0.022-inch slot bracket systems. Increasing patient age, Class II division 2 malocclusion, number of failed and emergency appointments, and multi-operator treatment all increase orthodontic treatment duration. Registration The trial was registered with ClinicalTrials.gov on 5 March 2014, registration number: NCT02080338. Protocol The protocol was published at DOI: 10.1186/1745-6215-15-389.

Original languageEnglish
Article numbercjy037
Pages (from-to)133-142
Number of pages10
JournalEuropean Journal of Orthodontics
Volume41
Issue number2
Early online date11 Jul 2018
DOIs
Publication statusPublished - Apr 2019

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    • 4 Citations
    • 2 Article

    A randomized clinical trial of the effectiveness of 0.018-inch and 0.022-inch slot orthodontic bracket systems: part 3 - biological side-effects of treatment

    El-Angbawi, A. M., Yassir, Y. A., McIntyre, G. T., Revie, G. F. & Bearn, D. R., Apr 2019, In : European Journal of Orthodontics. 41, 2, p. 154-164 11 p., cjy039.

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    A randomized clinical trial of the effectiveness of 0.018-inch and 0.022-inch slot orthodontic bracket systems: part 2 - quality of treatment

    Yassir, Y. A., El-Angbawi, A. M., McIntyre, G. T., Revie, G. & Bearn, D. R., Apr 2019, In : European Journal of Orthodontics. 41, 2, p. 143-153 11 p., cyj038.

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