Failure Rates of Two Types of Mini-Screws as Orthodontic Anchors

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, ۷۴ 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>۰.۰۵). Additionally, no significant differences were found when assessing the stability of Iranian and JEIL brands with ۳۵ mini-screws in the buccal area. Finally, an examination of ۳۹ 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.