Schmitt J M, Webber R L, Walker E C
National Institutes of Health, Division of Research Services, Biomedical Engineering and Instrumentation Branch, Bethesda, MD 20892.
IEEE Trans Biomed Eng. 1991 Apr;38(4):346-52. doi: 10.1109/10.133229.
In this preliminary study, we explored the feasibility of employing photoplethysmography and pulse oximetry to assess the status of the blood circulation in the dental pulp. A simple photometer that measures diffuse light transmission at 575 nm was built to record tooth plethysmograms, and the ability to distinguish vital from surgically devitalized teeth of a dog using plethysmography was demonstrated. As an extension of the photoplethysmographic technique, red-infrared pulse oximetry applied to the measurement of the oxygen saturation (SO2) of blood in the pulp was also examined using an in vitro test setup. Results suggest that the measurement of relative SO2 changes is feasible, but standard dual-wavelength pulse oximetry does not enable determination of SO2 independent of tooth geometry and sensor placement.
在这项初步研究中，我们探讨了利用光电容积描记法和脉搏血氧测定法评估牙髓血液循环状况的可行性。我们制作了一台简单的光度计，用于测量575nm处的漫射光透射率，以记录牙齿容积描记图，并证明了使用容积描记法区分狗的活牙和手术失活牙的能力。作为光电容积描记技术的扩展，还使用体外测试装置研究了应用于牙髓血液氧饱和度（SO2）测量的红-红外脉搏血氧测定法。结果表明，测量相对SO2变化是可行的，但标准双波长脉搏血氧测定法无法独立于牙齿几何形状和传感器位置来测定SO2。
