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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.

Abstract：

OBJECTIVE:To compare orthodontically induced inflammatory root resorption (OIIRR) and patient perception of pain during orthodontic treatment between 0.018-inch and 0.022-inch slot bracket systems. SUBJECTS AND METHODS:Eligible participants aged 12 years or above were allocated to treatment with the 0.018-inch or 0.022-inch slot MBT appliance (3M Unitek, Monrovia, California, USA) using block randomization in groups of 10. OIIRR was assessed radiographically using standardized periapical radiographs before and after 9 months from the start of treatment. Patient perception of pain was assessed using a validated patient questionnaire at 6 months from the start of treatment. Parametric tests (t-test) and non-parametric tests (chi-square with Fisher's exact tests and Kruskal-Wallis test) assessed differences between the groups (P < 0.05). The correlation between severity of OIIRR and abnormal root morphology, history of dental trauma, and pain during treatment was assessed. 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). There was no significant difference in the severity of the OIIRR nor patient perception of pain between the two study groups (P = 0.115 and P = 0.08 respectively). The correlation between the severity of OIIRR and abnormal root morphology or history of dental trauma was not statistically significant (P = 0.086 and P = 0.313). Moreover, there was no significant correlation between the severity of OIIRR and pain during treatment (R = 0.045, P = 0.617). LIMITATIONS:It was impossible to blind clinicians or patients to allocation, and oral hygiene and periodontal outcomes were not assessed. CONCLUSIONS:The effect of bracket slot size on the severity of OIIRR and patient perception of pain are not significant. TRIAL REGISTRATION:The trial was registered with ClinicalTrials.gov on 5 March 2014, registration number: NCT02080338.

journal_name

Eur J Orthod

journal_title

European journal of orthodontics

authors

El-Angbawi AM,Yassir YA,McIntyre GT,Revie GF,Bearn DR

doi

10.1093/ejo/cjy039

subject

Has Abstract

pub_date

2019-03-29 00:00:00

pages

154-164

issue

eissn

0141-5387

issn

1460-2210

pii

5050922

journal_volume

pub_type

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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.