Objective: To assess the success rate and proximity to the root of miniscrews by utilizing surgical guides produced through the integration of data obtained from cone-beam computed tomography and intraoral scanned models.
Methods: A retrospective study was conducted involving 113 patients (224 miniscrews) who underwent miniscrew placement as part of orthodontic treatment. Two operators placed miniscrews between the buccal alveolar bone of each patient and assessed the initial stability by measuring Periotest value (PTV) and insertion torque (IT). The groups were divided into two based on the miniscrew insertion method: MG (Manual Group) and SG (Surgical Guide Group). Root proximity was assessed using periapical radiographs. Miniscrews that remained in place for over 6 months were considered successful.
Results: There was a statistically significant difference in the Kaplan-Meier survival curve between groups (P < 0.05). The success rates of the miniscrews were 79.1% for the MG and 90.5% for the SG, respectively (P < 0.05). The root contact rate showed a statistically significant difference between groups (MG: 17.5%, SG: 0.1%, P < 0.001). The PTV and IT did not show significant different between the groups.
Conclusions: Proximity to the root and utilizing surgical guides have the most direct impact on the success rate of miniscrews. Root proximity can be effectively reduced by using surgical guides. Therefore, it is recommended to use a miniscrew surgical guide to increase the success rate of miniscrews as a stable anchorage device, especially in cases where the interradicular space is narrow.

Keywords: Orthodontic miniscrew, Miniscrew surgical guide, Success rate, Root proximity