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目的:探讨光学相干断层成像技术(OCT)检测窝沟早期人工龋的可行性。方法:利用pH循环法建立面窝沟早期龋模型,对其进行OCT扫描,获取二维伪彩图。在扫描路径所在位置制作牙磨片,进行偏光显微镜检测,获取其组织学图像。将二者所获取的图像进行形态学比较分析。结果:面窝沟健康牙釉质表面呈现一条光背向散射增强带,脱矿后牙釉质表面光反射和背向散射信号增强,光背向散射增强带厚度增加,光背向散射增强带下光信号迅速衰减。OCT检测出的龋损形态及深度与偏光显微镜下的组织学检测结果相符。结论:OCT可灵敏准确地检出人牙窝沟早期龋。
Objective: To investigate the feasibility of using optical coherence tomography (OCT) to detect early artificial pit in fissure pit. Methods: The maxillary caries model was established by pH cycle method. OCT scanning was performed to obtain the two-dimensional pseudo-color image. The toothbrush was made at the position of the scanning path and polarized microscopy was performed to obtain the histological image. Morphological comparison of the images obtained by the two. Results: The surface of enamel in the pterygoid fissure showed an optical backscattering enhancement zone. The optical reflectivity and backscatter signal of the enamel surface increased after demineralization. The thickness of the optical backscatter enhancement zone increased and the optical backscatter enhanced the optical signal attenuated quickly . The morphology and depth of carious lesions detected by OCT were consistent with the results of histological examination under polarized light microscope. Conclusion: OCT can be used to detect the early deciduous carina in the pit of teeth.