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Properties of human dental hard tissues by THz-SDs transmission system



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Properties of human dental hard tissues by THz-SDs transmission system


CAI Jiangwen XIONG Yu ZHU Liguo ZHONG Sencheng KOU Tingting CUI Yue ZHU Can ZHOU Jixiang

Department of Stomatology, First Affiliated Hospital, Army Medical University (Third Military Medical University), Chongqing, 400038; Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan Province, 621900, China


Terahertz spectroscopy hard dental tissue refractive index absorption coefficient

R312; R322.41

Objective    To explore the spectroscopical properties of human normal enamel and dentine by Terahertz time-domain spectroscopy (THz-SDs) transmission system, and to investigate the best parameter and frequency for imaging. Methods    Fifteen intact third molars were freshly extracted and sliced mesiodistally to 0.7 mm in thickness, and ground serially with sand-papers under running tap water. Terahertz spectrum of enamel and dentin were obtained with the THz-SDs, and then the absorption coefficient, refractive index and refractive index ratio of the dental hard tissues were calculated in the frequency of 0.2 to 1.3 THz. Results    ①The absorption coefficient of enamel was statistically significantly different with that of dentin at 0.3, 0.5 and 0.6 THz (P<0.05); ② Obvious differences were also observed in the refractive index between enamel and dentin at the range of 0.2~1.3 THz (P<0.05); ③ Since the refractive index may be more suitable to image the human dental hard tissue, and 0.3 THz was chosen to get the best contrast. Conclusion     Terahertz can be used to identify enamel and dentin, and refractive index is more suitable to image dental hard tissue. At 0.3 THz, the refractive index contrast of enamel and dentin is the largest.


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Last Update: 2018-06-14