Al Fakir Hussam, Carey Jason P, Melenka Garrett W, Nobes David S, Heo Giseon, Major Paul W
School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alta, Canada.
Faculty of Engineering, University of Alberta, Edmonton, Alta, Canada.
J Orthod. 2014 Sep;41(3):188-200. doi: 10.1179/1465313314Y.0000000096. Epub 2014 Mar 4.
Torque is applied to orthodontic brackets in order to alter the buccal-lingual angulation of a tooth. One factor that can affect torque is the ligation mode used to retain the archwire in the bracket slot. The objective of this study was to investigate the effects of stainless steel ligation on torque expression and bracket deformation.
This study utilized 60 upper right central incisor Damon Q brackets and 60 Ormco Orthos Twin brackets. The brackets used in this study were subdivided into four groups: (1) Damon Q ligated with SS ligature; (2) Damon Q with the sliding bracket door; (3) Orthos Twin bracket ligated with SS wire; and (4) Orthos Twin ligated with elastic ties. All brackets were tested using an orthodontic torque simulating device that applied archwire rotation from 0° to 45°.
All brackets ligated with stainless steel ties exhibited greater torque expression and less deformation than brackets without stainless steel ties. As well, Damon Q brackets exhibit less bracket deformation than Orthos Twin brackets.
Stainless steel ties can reduce the amount of plastic deformation for both types of brackets used in this study.
对正畸托槽施加扭矩以改变牙齿的颊舌向倾斜度。影响扭矩的一个因素是用于将弓丝固定在托槽槽沟内的结扎方式。本研究的目的是探讨不锈钢结扎对扭矩表达和托槽变形的影响。
本研究使用了60个右上中切牙Damon Q托槽和60个奥美科Orthos Twin托槽。本研究中使用的托槽被分为四组：（1）用不锈钢结扎丝结扎的Damon Q托槽；（2）带有滑动托槽门的Damon Q托槽；（3）用不锈钢丝结扎的Orthos Twin托槽；（4）用弹性结扎圈结扎的Orthos Twin托槽。所有托槽均使用正畸扭矩模拟装置进行测试，该装置使弓丝从0°旋转至45°。
与未使用不锈钢结扎丝的托槽相比，所有用不锈钢结扎丝结扎的托槽均表现出更大的扭矩表达和更小的变形。此外，Damon Q托槽比Orthos Twin托槽表现出更小的托槽变形。
不锈钢结扎丝可减少本研究中使用的两种类型托槽的塑性变形量。
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