牙齿无损探伤有限元分析

Finite Element Analysis on Non-destructive Testing of Dental Defects

目的采用有限元无损检测方法,研究不同牙齿缺陷下的检出效果,并为临床应用提供理论支撑。方法基于连续介质超声传播方法,在COMSOL软件中使用dG-FEM模型,模拟超声波传输和反射形态,通过改变模型内部牙齿缺陷类型和声波检测角度,监测声波的反射强度,并通过检出突变声波的时间和强度研究牙齿内部缺陷的检出效果。结果使用超声无损检测方法可在16μs检出牙齿内部缺陷,对于不同牙齿内部缺陷类型,矩形缺陷时检测效果最佳;采用不同位置检测时,超声声波正对缺陷检测时,返回声波强度最大。结论对牙齿内部的缺陷,可采用超声无损检测方法,快速检测缺陷类型,通过变换检测角度可增加缺陷检出效果,并为其实际应用提供理论参考。

Objective To study the detection effect of different dental defects by using the finite element nondestructive testing method,and provide some theoretical support for clinic practice.Methods Based on continuous medium ultrasonic propagation method,the dG-FEM model was used in COMSOL software to simulate ultrasonic transmission and reflection patterns.The ultrasonic reflection intensity was monitored by changing dental defect types and ultrasonic detection angles inside the model.The time and intensity of detecting mutated ultrasonic waves were used to study the detection effect of dental defects.Results Dental defects could be detected within 16μs by ultrasonic non-destructive method.For different types of dental defects,the best detection effect could be observed in rectangle-shaped defects.For different detection positions,when the ultrasound source and the defect were aligned in the main direction,the ultrasonic reflection intensity was the highest.Conclusions For defects of the tooth,the ultrasonic non-destructive testing method can be used for fast detection of defect types.The effect of defect detection can be increased by changing the detection angles,which provides theoretical references for its practical application.