BACKGROUND:In the orthodontic treatment, double wire technique is commonly used to correct the torque of anterior teeth;however, the underlying mechanical mechanisms remain unclear. OBJECTIVE:To study the torque capabilities of DamonQ system through the three-dimensional finite element method. METHODS:Three-dimensional finite element models of Damon Q brackets with different dimension arch wires were established and were grouped according to arch wire with different dimensions. The torque capabilities of Damon Q system with different dimensions and materials arch wire were analyzed. RESULTS AND CONCLUSION:The Damon Q brackets with single or double wires had the same variation of torque, torque angle curve changes under the condition of different size and material arch wires. Torque moment increased gradually with increasing torque angle. Rectangular-round double wires produced larger torque moment compared with single rectangular wire, whereas double round wires produced smal er torque moment compared with single rectangular wire. The torque moment produced by rectangular-round double wires or by single rectangular wire was approximately 2-8 times or 1-5 times more than that by double round wires. The torque moment that rectangular-round double wires produced was larger than that single wire produced in the DamonQ system. In the early clinical practice, we can use double round wires to control root movement. In the middle-term of the treatment, we can use rectangular-round double wires to control root movement as the mild forces produced by them reduce root absorption. This study lays a foundation for the application of Damon Q bracket with double wire technology in the clinic.%背景：在正畸临床治疗中，常用双丝技术矫正前牙转矩，但其力学机制尚不明确。目的：通过三维有限元方法研究DamonQ系统的转矩力学性能及其受双丝因素影响的规律。方法：建立DamonQ托槽和不同尺寸弓丝的三维有限元模型，并根据不同尺寸弓丝组合进行分组。分析不同材质、尺寸弓丝组合下的转矩力学性能。结果与结论：①在装配不同尺寸与材质弓丝的条件下，单、双丝Damon Q托槽产生了相同变化规律的转矩力矩/转矩角度曲线图：随着转矩角度的增大，转矩力矩逐渐增加；②单方丝与不同双丝转矩力比较：方-圆双丝转矩力最大，其次是单方丝，再次是圆-圆双丝；方-圆双丝力矩值为圆-圆双丝的2-8倍，单方丝为圆-圆双丝的1-5倍；③DamonQ系统中方-圆双丝转矩效能强于单方丝；④临床上在前牙区控根初期，可考虑圆-圆双丝辅助控根，矫治中期使用方-圆双丝控根，力值柔和可减少根吸收；⑤该研究为DamonQ托槽在临床上应用双丝技术奠定了基础。
展开▼
