Kishen A, Murukeshan V M, Krishnakumar V, Asundi A
Biomedical Engineering Research Center, School of Mechanical & Production Engineering, Nanyang Technological University, 639798, Singapore.
J Dent. 2001 Nov;29(8):531-7. doi: 10.1016/s0300-5712(01)00048-3.
To examine the in-plane and out-of-plane response of human dentine to thermal loads in real time.
An Electronic Speckle Pattern Interferometry (ESPI) system sensitive to both the in-plane and out-of-plane displacements was configured and used in conjunction with an advanced fringe processing technique. Specimens were prepared from freshly extracted lower central incisor teeth and were separately mounted on a thermal block to apply thermal loads from room temperature (25 degrees C) to 60 degrees C. The real time speckle patterns were acquired using a digital camera. These digital fringe patterns were subjected to further image processing to enhance the quality of fringes. The resultant images were later analyzed to study the out-of-plane and in-plane displacement gradients in the facio-lingual plane of the dentine.
The out-of-plane deformations were observed in the plane perpendicular to the long axis of the tooth, while the in-plane deformations occurred in the plane parallel to the long axis of the tooth.
The ESPI analysis revealed whole-field and distinct thermal response in human dentine in-plane and out-of-plane. The cervical dentine experienced distinct and conspicuous displacement to the temperature changes.
实时检测人牙本质在平面内和平面外对热负荷的响应。
配置了一种对平面内和平面外位移均敏感的电子散斑图案干涉测量（ESPI）系统，并结合先进的条纹处理技术使用。从新鲜拔除的下颌中切牙制备标本，并分别安装在热块上，以施加从室温（25摄氏度）到60摄氏度的热负荷。使用数码相机采集实时散斑图案。对这些数字条纹图案进行进一步图像处理以提高条纹质量。随后对所得图像进行分析，以研究牙本质颊舌平面内的平面外和平面内位移梯度。
在垂直于牙齿长轴的平面内观察到平面外变形，而在平行于牙齿长轴的平面内发生平面内变形。
ESPI分析揭示了人牙本质在平面内和平面外的全场且明显的热响应。颈部牙本质对温度变化有明显且显著的位移。
