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Randomized Controlled Trial
. 2021 Aug 2;22(1):22.
doi: 10.1186/s40510-021-00370-8.

Effect of miniscrew insertion angle in the maxillary buccal plate on its clinical survival: a randomized clinical trial

Amin Golshah  1 , Kimia Gorji  2 , Nafiseh Nikkerdar  3
Affiliations
Randomized Controlled Trial

Effect of miniscrew insertion angle in the maxillary buccal plate on its clinical survival: a randomized clinical trial

Amin Golshah et al. Prog Orthod. .

Abstract

Introduction: This study sought to assess the effect of miniscrew insertion angle (vertical and oblique) on its clinical survival under shearing forces in orthodontic patients undergoing canine retraction.

Materials and methods: In this split-mouth randomized controlled clinical trial, 50 miniscrews were placed bilaterally in 25 patients with 45° and 90° insertion angles relative to a line perpendicular to the occlusal plane distal to the maxillary first premolar extraction site. Allocation of insertion angles to the right/left side was random using the Random Allocation Software. The patients, clinician, and statistician were blinded to the allocation of miniscrews to the side of jaw. The patients were followed-up monthly for 6 months. The primary outcome was the clinical survival of miniscrews, which was evaluated at each follow-up session. The secondary outcomes were the miniscrew stability based on the Periotest value (PTV) and the level of pain experienced by patients at 1, 12, and 24 h, and 7 days after miniscrew placement using a visual analog scale (VAS). Data were analyzed using paired t-test, repeated measures ANOVA, and McNemar's test.

Results: The clinical survival rate of miniscrews placed at 90° and 45° angles was 76% and 88%, respectively. This difference was not statistically significant (P = 0.375). No significant difference was noted between the two groups regarding the PTV or the pain score either (P > 0.05).

Conclusion: Clinically, the insertion angle of miniscrews (90° versus 45° relative to a line perpendicular to the occlusal plane) has no significant effect on the miniscrew survival rate or stability during orthodontic treatment.

Trial registration: This trial was registered at www.irct.ir ( IRCT20190901044659N1 ).

Protocol: The protocol was published after trial commencement.

Keywords: Clinical survival; Miniscrew; Orthodontic treatment; Periotest; Visual analog scale.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Schematic view of the insertion of miniscrews: a 90° insertion angle, b 45° insertion angle
Fig. 2
Fig. 2
Coronal cross-sectional CBCT image for measuring the insertion angle of miniscrews
Fig. 3
Fig. 3
Periotest was held perpendicular to the longitudinal axis of the miniscrew to evaluate its stability
Fig. 4
Fig. 4
Flow diagram of the study according to the Consolidated Standards of Reporting Trials
See this image and copyright information in PMC

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