Hamadan University of Medical Sciences Avicenna Journal of Dental Research 2423-7582 17 2 2025 06 30 Failure Rates of Two Types of Mini-Screws as Orthodontic Anchors 84 89 10.34172/ajdr.2111 EN Nasrin Farhadian Amirfarhang Miresmaeili Anahita Morovat Behnaz Alafchi Journal Article 10.34172/ajdr.2111 2024 11 10 2024 11 27 Background: In orthodontic treatments, mini-screws are used when absolute anchorage is required for tooth movement. In daily clinical practice, it is common to observe mini-screws loosening after implantation. The aim of this clinical trial was to compare the failure rates of Iranian and Korean mini-screws utilized as orthodontic anchorage. Methods: In this study, 74 patients requiring anchorage with mini-screws in the upper jaw were randomly divided into study and control groups receiving Iranian (Poyanteb Company) and Korean (the JEIL brand) mini-screws, respectively. The patients were evaluated for stability or failure of the mini-screws at one week and then at one-, two-, and three-month intervals. Any degree of mobility was considered a failure. The data were analyzed using repeated measures ANOVA, Bonferroni post hoc test, and t test. Results: There were no significant differences in the stability of Iranian and JEIL brand screws when compared at intervals of one week, one month, two months, and three months (P>0.05). Additionally, no significant differences were found when assessing the stability of Iranian and JEIL brands with 35 mini-screws in the buccal area. Finally, an examination of 39 mini-screws from both brands in the palatal region of the maxilla revealed no statistical differences. Conclusion: In comparing Iranian and JEIL brand mini-screws, no significant difference was observed in the failure rate, with both demonstrating adequate efficiency and stability. Therefore, to reduce costs for patients, Iranian brands can be utilized effectively.