Korean J Orthod.  2021 Mar;51(2):86-94. 10.4041/kjod.2021.51.2.86.

Effect of micro-osteoperforations on external apical root resorption: A randomized controlled trial

• Shahrin AA
• Abdul Ghani SH
• Norman NH

• KMID: 2513577
• DOI: http://doi.org/10.4041/kjod.2021.51.2.86

Abstract

Objective
This study aimed to investigate the effect of micro-osteoperforations (MOPs) on external apical root resorption (EARR) during the initial orthodontic alignment phase of maxillary anterior crowding.
Methods
Thirty patients (25 females, 5 males; mean age, 22.66 ± 3.27 years) who presented with moderate crowding of the upper labial segment and underwent extraction-based fixed appliance treatment were recruited. They were randomly allocated to receive adjunctive therapy with MOPs (n = 15) or treatment with fixed appliances only (control group; n = 15). EARR was measured from long-cone periapical radiographs taken at the start and the sixth month of treatment. A correction factor for the enlargement difference was used to calculate EARR. Data were analyzed with descriptive statistics and repeated-measures analysis of variance.
Results
The mean root lengths of 168 teeth were measured and showed no statistically significant difference (p > 0.05) after six months of fixed appliance treatment in the MOP (mean difference [MD] = 0.13 mm; 95% confidence interval [CI] = −0.10–0.35) and control group (MD = 0.14 mm; 95% CI = −0.10–0.37). Most of the roots in the MOP and control groups (42.86% and 52.38%, respectively) showed only mild resorption. Less than 8% of the roots in both groups (7.14% in the MOP group and 4.76% in the control group) showed moderate resorption.
Conclusions
Acceleration of orthodontic tooth movement with adjunctive MOPs therapy during the alignment phase does not exacerbate EARR in patients with moderate crowding of the upper labial segment in comparison with controls.

Keyword

Micro-osteoperforations; External apical root resorption; Orthodontic alignment; Iatrogenic effect

Figure

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  Figure 1 Intraoral periapical (IOPA) radiographs. A, Pre-IOPA taken before orthodontic treatment. B, Post-IOPA repeated after 6 months of treatment.

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  Figure 2 Measurements of total root and crown length at (A) T1: pre-treatment, (B) T2: post-treatment after 6 months were performed on intraoral periapical radiographs at the median point of the tooth axis. R1, pre-treatment root length; R2, post-treatment root length; C1, pre-treatment crown length; C2, post-treatment crown length.

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  Figure 3 Consolidated Standards of Reporting Trials (CONSORT) study flow diagram. MOP, micro-osteoperforation.

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