Archwire depth is a significant parameter in the frictional resistance of active and interactive, but not passive, self-ligating brackets

作者：Oliver Christa L^*; Daskalogiannakis John; Tompson Bryan D

来源：The Angle Orthodontist, 2011, 81(6): 1036-1044.

DOI：10.2319/122810-751.1

• Friction
• Self-ligating
• Sliding mechanics
• Resistance to sliding
• Archwire size
• Bracket

Objective: To elucidate some of the parameters determining the frictional behavior of passive, active, and interactive self-ligating brackets during sliding mechanics.
Materials and Methods: A custom jig mimicking the three-dimensional tooth movements that occur during sliding mechanics and an Instron testing machine were used to determine the resistance to sliding of six different self-ligating brackets (SPEED, In-Ovation C, CarriereSLB, ClaritySL, Smart Clip, VisionLP). Each bracket was tested on three rectangular stainless steel wires: 0.017 x 0.022 inch, 0.017 x 0.025 inch, and 0.019 x 0.025 inch. A two-way balanced analysis of variance was used for statistical analysis.
Results: The four passive self-ligating brackets (CarriereSLB, ClaritySL, Smart Clip, VisionLP) displayed significantly lower frictional resistance (P < .001) than the remaining brackets, which featured an active (SPEED) or interactive (In-Ovation C) clip. The SPEED bracket consistently demonstrated the highest resistance to sliding.
Conclusions: The mode of self-ligation appears to be the primary variable in determining the frictional behavior of orthodontic brackets undergoing sliding mechanics. Passive self-ligating brackets demonstrated significantly lower frictional resistance to sliding. With regard to the resistance of active self-ligating brackets, the depth (buccolingual thickness) of the wire had a more significant influence than its height. (Angle Orthod. 2011;81:1036-1044.)

• 出版日期2011-11