垂直关闭曲与Omega曲组合正畸弓丝矫治力建模及实验研究

Modeling and experiment study of orthodontic force of combined vertical-closure-loop and Omega-loop orthodontic archwire

目前临床正畸治疗过程主要依赖医师经验,所施加矫治力大小难以量化。而在弓丝末端弯制Omega曲可以对同弓丝弯制的垂直关闭曲实现持续及多次加力的效果,减少医师和患者的临床治疗时间,提高正畸治疗效率。为了量化垂直关闭曲与Omega曲组合正畸弓丝在正畸过程中所产生的矫治力,分析一丝多曲组合正畸弓丝的受力特征,并基于梁微形变原理和相互作用力原理,建立垂直关闭曲与Omega曲组合正畸弓丝的矫治力力学模型。探究一丝多曲组合正畸弓丝弯制参数对矫治力的影响规律。通过构建一丝多曲组合正畸弓丝的三维模型和矫治力测量实验平台,进行有限元仿真分析和实验测量。将力学模型计算得到的计算数据和仿真分析得到的仿真数据分别与基于一维力传感器的矫治力测量实验得到的实验数据进行相关性分析,得到计算数据与实验数据的相关性系数ξT≥98.192%,仿真数据与实验数据的相关性系数ξA≥97.34%,验证了所建立力学模型的准确性及仿真模型和仿真过程的可靠性。该力学模型和仿真模型能够辅助医师安全、高效的设计个性化正畸弓丝,为正畸弓丝的应用提供理论依据,并进一步为临床数字化正畸治疗奠定基础。

The current clinical orthodontic treatment process mainly relies on the doctors′experience.It is difficult to quantify the magnitude of the applied orthodontic force.The Omega-loop bent at the end of the orthodontic archwire can realize the effect of continuous and multiple reloading on the vertical-closure-loop bent at the same orthodontic archwire.Thus,this can reduce the clinical treatment time,and improve the efficiency of orthodontic treatment.The aim of this study is to quantify the orthodontic force generated by combining vertical closure and Omega loop orthodontic archwire.The force characteristics of the one-wire multi-loop combination orthodontic archwire is analyzed,and the orthodontic force is established by using the principle of beam micro-deformation and the principle of interaction force.The influence of bending parameters of the one-wire multi-loop combination orthodontic archwire on the orthodontic force is investigated.By formulating a 3D model of the one-wire multi-loop combination orthodontic archwire and an experimental platform for orthodontic force measurement,the finite element simulation analysis and experimental measurements are performed.The correlation analysis is conducted between the calculated data obtained from the mechanical model and the simulation data obtained from the simulation analysis and the experimental data obtained from the orthodontic force measurement experiment based on the one-dimensional force sensor.The correlation coefficient isξT≥98.192%between the calculated and the experimental data,and the correlation coefficient isξA≥97.34%between the simulated and the experimental data.The accuracy and the reliability of the mechanical model,the simulation model and the simulation process are evaluated.The mechanical model and simulation model can assist physicians to design the personalized orthodontic archwire safely and efficiently.It provides theoretical basis for effective orthodontic treatment and further lays the foundation for clinical personalized and digital orthodontic treatment.