Ledingham, Austin D. University of Texas Health Science Center at Houston - School of Dentistry, USA , Şar, Çağla Başkent University - School of Dentistry - Department of Orthodontics, Turkey , English, Jeryl D. University of Texas Health Science Center at Houston - School of Dentistry - Department of Orthodontics, USA , Akyalçın, Sercan University of Texas Health Science Center at Houston - School of Dentistry - Department of Orthodontics, USA

Is there a difference between the primary stability of anodized and non-anodized mini screws subjected to repeated cycles of autoclave sterilization?

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Objectives: To determine if autoclave sterilization has any deleterious effects on the clinical stability of anodized versus non-anodized mini-screws. Materials and Methods: Thirty anodized and thirty non-anodized Aarhus System mini-screws (American Orthodontics, Sheboygan, WI) were utilized. Each group was divided into three test groups. In each group, miniscrews that were sterilized once using a steam autoclave (Statim 5000, SciCan USA, Canonsburg, Pa) served as the control group (n=10). The other two test groups involved mini-screws that were subjected to a repeated cycles of sterilization for five (n=10) and ten (n=10) times. All sixty mini-screws were inserted at a 90° angle into custom-designed synthetic blocks that simulated the average mandible of a healthy adult. The maximum insertion torque and the lateral displacement at 0.025, 0.05, 0.1, 0.25, 0.5, and 1 mm were recorded for each sample and subjected to statistical testing. A two-way ANOVA, and a three-way mixed ANOVA were used for statistical analyses. Results: Maximum insertion torque values displayed significant differences between the anodized and nonanodized groups (p 0.001) as well as the sterilization cycles (p 0.001). No significant group and cycle interaction was observed. No significant differences were found between the groups and sterilization cycles in the evaluation of the lateral displacement test. However, there was a significant group/cycle/displacement interaction (p 0.001). Conclusions: Surface treatment of mini-screws with anodization produced differences when compared to standard surface mini-screws following autoclave sterilization. The differences between the two types of miniscrews did not indicate a potential stability concern.

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Stability , mini , screws , sterilization

Cumhuriyet Dental Journal

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