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首页> 外文期刊>Journal of dentistry >Influence of tooth-surface hydration conditions on optical coherence-tomography imaging.
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Influence of tooth-surface hydration conditions on optical coherence-tomography imaging.

机译：牙齿表面水合条件对光学相干断层扫描成像的影响。

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OBJECTIVES: This study examined the influence of tooth-surface hydration conditions on optical coherence tomography (OCT) imaging. METHODS: Emitted light was coupled in a single-mode fibre-optic Michelson interferometer, and delivered to a sample and a reference mirror mounted on a linearly translating galvanometer driven by a triangular voltage waveform at a fringe-modulation frequency of 1kHz. Backscattered light from the sample was coupled back to the system, digitised and used to create two-dimensional images together with beam scanning. OCT imaging of the occlusal surfaces of 10 extracted human teeth was performed soon after mounting ('wet' condition), immediately after air blowing for 10s ('air-blow' condition), and at intervals thereafter ('1-min', '5-min' and '10-min' conditions, respectively). RESULTS: For the wet condition, three distinct peaks indicated the water surface, tooth surface and dentino-enamel junction. Backscattered light was detected at levels above noise, possibly causing grainy OCT images. By contrast, two distinct peaks indicating the tooth surface and dentino-enamel junction were observed for the air-blow and 10-min conditions, with greater signal intensities for the latter. The intensity was lower for the air-blow condition than the wet condition. The signal intensities decreased during storage in air at room temperature. CONCLUSION: Tooth-substrate hydration conditions thus appeared to influence time domain-OCT imaging.
机译：目的：这项研究检查了牙齿表面水合条件对光学相干断层扫描（OCT）成像的影响。方法：发出的光在单模光纤迈克尔逊干涉仪中耦合，然后传递到样品和安装在线性平移检流计上的参考镜，该检波镜由三角电压波形以1kHz的条纹频率驱动。来自样品的反向散射光耦合回系统，被数字化，并与光束扫描一起用于创建二维图像。安装后（“湿”状态），吹气10s（“吹气”状态）之后以及之后（“ 1分钟”，“ 1分钟”）立即对10个拔出的人类牙齿的咬合面进行OCT成像。 5分钟”和“ 10分钟”条件）。结果：在潮湿条件下，三个明显的峰表明水表面，牙齿表面和牙本质-牙釉质结合处。检测到反向散射光的强度高于噪声水平，可能会导致颗粒状的OCT图像。相比之下，在吹气和10分钟条件下观察到两个明显的峰值，表明牙齿表面和牙本质-牙釉质的结合，后者的信号强度更大。吹气条件下的强度低于湿气条件下的强度。在室温下储存在空气中期间，信号强度降低。结论：牙齿-基质的水合条件因此似乎影响时域-OCT成像。

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