A new multi-wavelength optical-plethysmograph for quantitative determination of pulpal hemoglobin content and oxygen level using green and near-infrared LEDs

S. Kakino D.D.S.; Z. Miwa D.D.S.; A. Kirimoto D.D.S.; K. Ohuchi; S. Takatani; Y. Takagi D.D.S.

doi:10.1117/12.699628

8 March 2007 A new multi-wavelength optical-plethysmograph for quantitative determination of pulpal hemoglobin content and oxygen level using green and near-infrared LEDs

S. Kakino D.D.S., Z. Miwa D.D.S., A. Kirimoto D.D.S., K. Ohuchi, S. Takatani, Y. Takagi D.D.S.

Author Affiliations +

Proceedings Volume 6425, Lasers in Dentistry XIII; 642508 (2007) https://doi.org/10.1117/12.699628
Event: SPIE BiOS, 2007, San Jose, California, United States

Abstract

A new multi-wavelength optical-plethysmograph has been designed to study the relation between the transmitted optical density (OD) of the tooth vs. hemoglobin (Hb) content and oxygen saturation (SO₂) of the pulpal blood using the 467, 506, 522 and 810 nm light emitting diodes (LEDs). The experimental model utilized the extracted human upper incisor where the pulp cavity was filled with the blood having various values of Hb and SO₂. A resin cap was made to fit the tooth crown and optical fibers for transmission measurement. The LEDs were pulsed sequentially at 520 Hz with the pulse duration of 240 μs. The OD as a function of Hb for the isosbestic wavelengths of 506 and 522 nm increased almost linearly from 8.0 to 11.0 for Hb changing from 0.0 (saline control) to 2.5 g/dL, but beyond 2.5 g/dL no change was observed. At 810 nm, the OD increased linearly till Hb of 13.4 g/dL, but its change was much smaller with 1.0 OD per 13.4 g/dL. As for SO₂, the OD at 467 nm with Hb of 1.0 g/dL that simulated the mean pulpal Hb content in vivo varied by about 1.0 for SO₂ changing from 100 to 40%. The OD change with respect to Hb change at 506 and 522 nm showed better sensitivity than that at 810 nm. The combination of 467 and 506 or 522 nm wavelengths can provide a noninvasive measurement of both pulpal Hb content and SO₂ to diagnose pulp vitality of teeth in vivo.

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S. Kakino D.D.S., Z. Miwa D.D.S., A. Kirimoto D.D.S., K. Ohuchi, S. Takatani, and Y. Takagi D.D.S. "A new multi-wavelength optical-plethysmograph for quantitative determination of pulpal hemoglobin content and oxygen level using green and near-infrared LEDs", Proc. SPIE 6425, Lasers in Dentistry XIII, 642508 (8 March 2007); https://doi.org/10.1117/12.699628

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