Korean J Orthod.  2025 May;55(3):167-175. 10.4041/kjod24.166.

Effect of a miniscrew surgical guide on the success rate and root proximity of orthodontic miniscrews: A retrospective cohort study

• Andrew Choi EH
• Kim D
• Jing L
• Yu HS
• Choi SH
• Cha JY

• KMID: 2568339
• DOI: http://doi.org/10.4041/kjod24.166

Abstract

Objective
To assess the success rate and proximity of miniscrews to the root using surgical guides produced by integrating data obtained from conebeam computed tomography and intraoral scanned models.
Methods
This retrospective study involved 113 patients (224 miniscrews) who underwent miniscrew placement as part of their orthodontic treatment. Two operators placed miniscrews between the buccal alveolar bone of each patient and assessed initial stability by measuring the Periotest value (PTV) and insertion torque (IT). Patients were divided into two groups based on the miniscrew insertion method: manual group (MG) and surgical guide group (SG). Root proximity was assessed using periapical radiography, and miniscrews that remained in place for over 6 months were considered successful.
Results
There was a statistically significant difference in the Kaplan–Meier survival curves between the groups (P < 0.05). The success rates of the miniscrews were 79.1% and 90.5% for the MG and SG, respectively (P < 0.05). The root contact rate also differed significantly between the groups (MG, 17.5%; SG, 0.1%; P < 0.001). However, the PTV and IT did not show significant differences between the groups.
Conclusions
Proximity to the root and utilization of surgical guides have the most direct impact on the success rate of miniscrews. Root proximity can be effectively reduced using surgical guides. Therefore, the use of a miniscrew surgical guide is recommended to increase the success rate of miniscrews as stable anchorage devices, particularly in cases with narrow interradicular space.

Keyword

Orthodontic miniscrew; Miniscrew surgical guide; Success rate; Root proximity

Figure

• 

  Figure 1 Process of manufacturing a miniscrew surgical guide: A, Intraoral scanned data; B, Registration of cone-beam computed tomography and scanned data; C, Determination of the miniscrew site from axial views; D, Determination of the miniscrew site from sagittal views; E, Surgical guide with 3D printed resin base and metal sleeve; F, Process of placing miniscrews using the surgical guide.

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  Figure 2 Kaplan–Meier survival curves according to groups: The x-axis represents time to event in days, and the y-axis shows the cumulative survival ratio of the miniscrew. The cumulative survival rate of the guide group (red line) exceeded that of the manual group (blue line).

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