fa Effects of repeated sterilization cycles on primary stability of orthodontic mini-screws ارتودنسی Orthodontics پژوهشي Research <p> <strong>Objective:</strong></p><p>  To determine if repeated sterilization has deleterious effects on the clinical stability of mini-screws. </p><p> <strong>Materials and Methods</strong>: </p><p> Thirty each of the following mini-screws were tested: Aarhus (American Orthodontics, Sheboygan, Wisc), VectorTAS (Ormco Corporation, Orange, Calif), Dual-Top (RMO, Denver, Colo), and Ortho Anchor (KLS Martin, Jacksonville, Fla). Controls were sterilized once using a steam autoclave (Statim 5000, SciCan USA, Canonsburg, Pa). Each group of mini-screws was divided into three groups: the control (n  =  10) and two test groups (n  =  10, each). Test groups were cycled five and 10 times respectively. All screws were inserted into custom-designed synthetic blocks that simulated mandibular bone. Maximum insertion torque and lateral displacement force data were recorded and subjected to statistical testing. Two-way analysis of variance (ANOVA) and three-way mixed ANOVA were used for statistical analyses for maximum insertion torque data and lateral displacement force data, respectively. Level of significance was established at P < .05. </p><p> <strong>Results:</strong> </p><p> Insertion torque values displayed significant differences between both of the groups and sterilization cycles (P < .05). Significant differences were observed between American Aarhus mini-screws and both RMO and KLS Martin mini-screws. Ormco Vector mini-screws also differed significantly from the KLS Martin mini-screws in this comparison (P < .05). For lateral displacement, there was a significant main effect of groups, F(1,36)  =  14.5 (P < .05). Significant differences were observed between American Aarhus mini-screws and all three of the other groups (P < .05). </p><p> <strong>Conclusions:</strong></p><p>  The examined groups displayed statistical differences of variable quality that may not affect their clinical stability. </p><hr><p></p><p> <strong>Source: </strong>The Angel Orthodontists</p><p> <a href="http://www.angle.org/doi/abs/10.2319/082612-685.1" target="_blank"><font color="#0000ff">Full Text</font></a></p> Mini-screws, Sterilization, Stability 0 0 http://idai.ir/browse.php?a_code=A-10-32-1998&slc_lang=fa&sid=1 Sercan Akyalcin sercan.akyalcin@uth.tmc.edu 10031947532846009384 10031947532846009384 Yes Department of Orthodontics, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, Tex Holly P. McIver 10031947532846009385 10031947532846009385 No Kingwood, Tex Jeryl D. English 10031947532846009386 10031947532846009386 No Department of Orthodontics, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, Tex Joe C. Ontiveros 10031947532846009387 10031947532846009387 No Department of Restorative Dentistry and Prosthodontics, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, Tex Ron L. Gallerano 10031947532846009388 10031947532846009388 No Department of Orthodontics, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, Tex