目的 本研究旨在建立超声无损检测模型,探究其在牙齿内部不同缺陷类型的检测效果,并为其提供理论支撑。方法 基于连续介质超声传播方法,采用dG-FEM方法在COMSOL中建立了牙齿内部缺陷无损检测模型,解释了超声波在均匀介质中的传播规律,并获得了缺陷的超声波脉冲发射接收示意图。结果 不同类型的牙齿缺陷均可在16微秒内检出,裂纹类缺陷检出强度最高,为22%。星形缺陷的检出信号最弱。此外,超声源和缺陷主要方向正对时,检测强度最高,同向朝向时检测强度最弱,低于3%。结论 本研究成功建立了超声无损检测模型,探究了其在牙齿内部不同缺陷类型的检测效果,采用多位置超声检测牙齿缺陷的方法可提高缺陷检测准确性,沿牙齿周向检测可出现周期变化,且存在全域缺陷检测信号最大值和最小值,增强了牙齿缺陷检测准确性,提高了牙齿缺陷诊疗效率。
Objective This paper aims to contribute to the field of ultrasonic non-destructive testing by establishing a model that can effectively detect different types of defects inside teeth. Methods The dG-FEM method is adopted to create an ultrasonic non-destructive testing model in COMSOL. By measuring various types of dental defects and measuring the same defects at different angles, the propagation law of ultrasonic waves in homogeneous media is explained. The results are presented in the form of ultrasound pulse emission and reception diagrams of the defects, as well as the comparison of detection signals and angle signals of different types of defects inside teeth. Results Different types of tooth defects can be detected within 16 microseconds, with the highest detection strength being observed in crack-type defects, at 22%. The detection signal for star-shaped defects is the weakest. Additionally, when the ultrasound source and the defect are aligned in the main direction, the detection strength is the highest, whereas the detection strength is the weakest when they are aligned in the same direction, with a value lower than 3%. Conclusions In conclusion, this study provides a comprehensive investigation of the potential of ultrasonic non-destructive testing in dentistry. With the establishment of an effective model and the demonstration of its potential, this study contributes to the development of new and more accurate diagnostic tools for dental practitioners.