Multispectral near-IR reflectance and transillumination imaging of teeth.
Multispectral near-IR reflectance and transillumination imaging of teeth.
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DOI：
10.1364/boe.2.002804
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发表时间：
2011-10-01
影响因子：
3.4
通讯作者：
Darling CL
中科院分区：
文献类型：
--
作者：
Chung S;Fried D;Staninec M;Darling CL
近红外成像方法不需要电离辐射，并且具有在高风险近端和咬合面牙齿表面以及在发育的最早阶段检测龋齿病变（蛀牙）的巨大潜力。以前在体外和体内的研究表明，在1300 nm的高对比度的反射率和透照图像可以获得的龋齿病变的牙齿近端和咬合面，其中大多数新的decays. Water的吸收显着变化之间的1200和1600 nm和散射性能的釉质和底层的牙本质还没有在这个区域的特点。高光谱反射率的研究表明，较低的反射率从健全的牙釉质和牙本质在近红外波长较高的水吸收。本成像研究的目的是确定1200和1600 nm之间的NIR波长为每种不同的NIR成像模式提供最高的脱矿或龋齿病变对比度，包括近端和咬合面沿着的透照以及交叉偏振反射测量。一个卤钨灯与几个光谱滤波器和锗增强CMOS焦平面阵列（FPA）敏感从400至1600 nm的被用来获取图像的龋齿病变提取的牙齿。在12个5 & 6 mm厚的牙齿切片上创建人工邻间病变，用于透照成像。54颗疑似咬合损伤的拔牙也在咬合透照和反射成像模式下进行了检查。还将窝洞制备物切割成整个牙齿并用复合材料填充，并用于比较复合材料和釉质在NIR波长下的对比度。波长大于1400 nm的近红外线可能有更好的性能为透照的咬合面龋损，而1300 nm的近表面的透照似乎最好。釉质中移动的水的损失显著降低了釉质在所有NIR波长下的透明度。在具有较高吸水率的波长（即1460-nm）处的反射率测量获得了显著更高的对比度。具有较高吸水率的波长也提供了较高的复合材料对比度。
NIR imaging methods do not require ionizing radiation and have great potential for detecting caries lesions (tooth decay) on high-risk proximal and occlusal tooth surfaces and at the earliest stages of development. Previous in vitro and in vivo studies at 1300-nm demonstrated that high contrast reflectance and transillumination images could be acquired of caries lesions on tooth proximal and occlusal surfaces where most new decay is found. Water absorption varies markedly between 1200 and 1600-nm and the scattering properties of enamel and the underlying dentin have not been characterized in this region. Hyperspectral reflectance studies show lower reflectivity from sound enamel and dentin at NIR wavelengths with higher water absorption. The purpose of this imaging study was to determine which NIR wavelengths between 1200 and 1600-nm provide the highest contrast of demineralization or caries lesions for each of the different modes of NIR imaging, including transillumination of proximal and occlusal surfaces along with cross polarization reflectance measurements. A tungsten halogen lamp with several spectral filters and a Ge-enhanced CMOS focal plane array (FPA) sensitive from 400 to 1600-nm were used to acquire the images of caries lesions on extracted teeth. Artificial interproximal lesions were created on twelve tooth sections of 5 & 6-mm thickness that were used for transillumination imaging. Fifty-four extracted teeth with suspected occlusal lesions were also examined in both occlusal transillumination and reflectance imaging modes. Cavity preparations were also cut into whole teeth and filled with composite and used to compare the contrast between composite and enamel at NIR wavelengths. NIR wavelengths longer than 1400-nm are likely to have better performance for the transillumination of occlusal caries lesions while 1300-nm appears best for the transillumination of proximal surfaces. Loss of mobile water in enamel markedly reduced the transparency of the enamel at all NIR wavelengths. Significantly higher contrast was attained for reflectance measurements at wavelengths that have higher water absorption, namely 1460-nm. Wavelengths with higher water absorption also provided higher contrast of composite restorations.