利用太赫兹光谱技术对恒牙和乳牙进行特征分析。

Characterization of primary and permanent teeth using terahertz spectroscopy.

机构信息

1 Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Ankara University, Ankara, Turkey.

出版信息

Dentomaxillofac Radiol. 2014;43(6):20130404. doi: 10.1259/dmfr.20130404. Epub 2014 Jun 18.

DOI:10.1259/dmfr.20130404

PMID:24940807

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4141674/

Abstract

OBJECTIVES

To analyse teeth samples by using terahertz time-domain spectroscopy (THz-TDS) system that was developed in the laboratory to measure the properties of sliced teeth sections in transmission mode.

METHODS

Using home-built THz-TDS system, we analysed a total of 25 teeth samples (9 primary and 16 permanent teeth). For transmission measurements, the refractive index and absorptive properties of the teeth sections were calculated. Difference between groups was tested using Mann-Whitney U-test statistics at the specific frequency of 0.5 THz, which was at the midpoint of the bandwidth. Median and minimum-maximum values were given as descriptive statistics. Type-I error rate was taken as α = 0.05.

RESULTS

Median refractive index values for permanent and primary teeth were found to be 2.53 and 2.54, respectively. Median absorption coefficient values for permanent and primary teeth were found to be 26.29 and 29.67, respectively. Median refractive index values for both healthy and carious teeth were found to be 2.54. Median absorption coefficient values for healthy and carious teeth were found to be 26.52 and 27.13, respectively. Although higher median absorption coefficient values were found for primary and carious teeth than those of permanent and healthy teeth, the differences were insignificant (p > 0.05). In addition, no statistical differences were found for refractive index values among different groups (p > 0.05).

CONCLUSIONS

THz imaging has the potential to be used in assessing dental structures.

摘要

目的

使用实验室自主研发的太赫兹时域光谱（THz-TDS）系统分析牙齿样本，该系统用于测量切片牙齿在透射模式下的特性。

方法

使用自制的太赫兹时域光谱系统，我们共分析了 25 个牙齿样本（9 个乳牙和 16 个恒牙）。对于透射测量，计算了牙齿切片的折射率和吸收特性。在特定的 0.5 THz 频率（带宽中点）处使用曼-惠特尼 U 检验统计数据测试组间差异。给出中位数和最小值-最大值作为描述性统计。I 型错误率取为α=0.05。

结果

发现恒牙和乳牙的折射率中位数分别为 2.53 和 2.54。发现恒牙和乳牙的吸收系数中位数分别为 26.29 和 29.67。发现健康和龋齿牙齿的折射率中位数均为 2.54。发现健康和龋齿牙齿的吸收系数中位数分别为 26.52 和 27.13。尽管乳牙和龋齿牙齿的吸收系数中位数高于恒牙和健康牙齿，但差异无统计学意义（p＞0.05）。此外，不同组间的折射率值无统计学差异（p＞0.05）。