Research Centre for Dental Sciences CICO, Department of Integral Adults Dentistry, Dental School, Universidad de La Frontera, Temuco 4811230, Chile.
Laboratorio de Cibernética, Departamento de Bioingeniería, Facultad de Ingeniería, Universidad Nacional de Entre Ríos, Oro Verde 3100, Argentina.
Sensors (Basel). 2020 Nov 6;20(21):6324. doi: 10.3390/s20216324.
Electromagnetic articulography (EMA) have been mostly employed to study articulatory movements of speech. This technology appears to be very promising for studying mandibular movements within the field of dentistry. However, there are no studies reporting the validity of EMA for such purpose. The aim of this study is to assess accuracy and reliability of Carstens three-dimensional EMA AG501 in order to validate its use for mandibular movement analysis in dentistry. A set of tests was conducted attaching 16 sensors to a rotating rigid structure placed inside the measurement area. Another set of tests were conducted using a mouth anatomical model with human-like articulatory behaviour. A function of the EMA system called "head correction" was applied to normalize the data of every recording. The system reliability was higher at the centre of the measurement area and decreased toward the edges. Dispersion was greater for raw data than for normalized data. Bland-Altman analysis of agreement between the AG501 and a millimetre ruler used to measure the distance between the sensors revealed limits of agreement between 0.5 mm and -0.9 mm. The results suggest that EMA AG501 is valid for three-dimensional analysis of mandibular biomechanics allowing natural movements.
电磁关节描记术（EMA）主要用于研究语音的发音动作。这项技术在口腔医学领域研究下颌运动似乎非常有前景。然而，目前还没有研究报告 EMA 在这方面的有效性。本研究旨在评估 Carstens 三维 EMA AG501 的准确性和可靠性，以验证其在口腔医学中用于下颌运动分析的用途。一组测试将 16 个传感器附着在放置在测量区域内的旋转刚性结构上进行。另一组测试使用具有类似人体发音行为的口腔解剖模型进行。EMA 系统的一个名为“头部校正”的功能被应用于标准化每个记录的数据。系统可靠性在测量区域的中心较高，而在边缘降低。原始数据的离散度大于归一化数据。AG501 与用于测量传感器之间距离的毫米尺之间的一致性的 Bland-Altman 分析显示，协议的限制在 0.5 毫米至-0.9 毫米之间。结果表明，EMA AG501 可用于允许自然运动的下颌生物力学的三维分析。
