Bishara S E, Fehr D E
Department of Orthodontics, College of Dentistry, University of Iowa, Iowa City.
Am J Orthod Dentofacial Orthop. 1993 Mar;103(3):253-7. doi: 10.1016/0889-5406(93)70006-A.
The removal of most ceramic brackets is accomplished by specially designed pliers that apply some form of tensile or shear force to the tooth surface. While the shear and tensile bond strengths for ceramic brackets in vitro have been reported, a simulation of the actual force application when using sharp-edged debonding pliers to debond a bracket has not. The purpose of this study is to determine the effectiveness and the force levels generated by the use of both the wide and the narrow blades in the debonding of ceramic brackets. The present findings indicate that the narrow blades effectively debonded ceramic brackets with a significantly lower mean debonding force (120 kg/cm2) than the wider blades (150 kg/cm2). The surface area of the blade in contact with the bracket-adhesive interface is less for the narrow blade (2.0 mm) than for the wide blade (3.2 mm). This relatively smaller contact area is sufficient to debond a bracket at a significantly lower debonding force.
大多数陶瓷托槽的拆除是通过专门设计的钳子来完成的，这些钳子会对牙齿表面施加某种形式的拉力或剪切力。虽然已有关于陶瓷托槽在体外的剪切和拉伸粘结强度的报道，但尚未对使用边缘锋利的去粘结钳子去除托槽时实际施加力的情况进行模拟。本研究的目的是确定在拆除陶瓷托槽时使用宽刃和窄刃钳子的有效性以及所产生的力水平。目前的研究结果表明，窄刃能有效地拆除陶瓷托槽，其平均去粘结力（120 kg/cm²）明显低于宽刃（150 kg/cm²）。窄刃（2.0 mm）与托槽 - 粘结剂界面接触的刀片表面积比宽刃（3.2 mm）小。这种相对较小的接触面积足以在显著更低的去粘结力下去除托槽。
