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A study on a noninvasive pulp diagnostic method using transmitted light photoplethysmography

透射光光电体积描记法无创牙髓诊断方法的研究

基本信息

批准号：
05671589
负责人：
IKAWA Motohide
金额：
$ 1.34万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05671589/
关键词：
pulp blood flow diagnosis photoplethysmography

项目摘要

In order to construct an optimal detection system for the transmitted light, light transmittance characteristics of the human extracted teeth and the human peripheral blood were investigated between 400 and 800 nm using a spectrophotometer. A tungsten incandescent light and a CdS-CdSe photoconductive cell were used as the light source and the photodetector, respectively. The spectrum analysis showed that the light of its wavelength shorter than 600 nm was more absorbable by the blood than the longer wavelength.Transmitted light photoplethsmography (TLP) was applied to vital human upper central incisors of healthy volunteers. Three different light sources (the tungsten light, a LED with its peak at 565 nm (LED565) and a LED with its peak at 695 nm (LED695)) were used as the light source. The light illuminated the palatal surface of the tooth crown and the transmitted light was collected form the labial side. The Cds-CdSe photoconductive cell was used as the photodetector. Pulse waves were observed on most of the examined teeth with the LED565, however, it was difficult to recognise the pulse wave with the tungsten light and the LED695 The results indicated the LED565 was suitable for the pulpal TLP.Then, the detectable area of the root pulp blood flow by our method was assessed. Human extracted upper central incisors were used to determine the transmitted area of the light. An LED (intensity peak 565 nm) and an optical fiber (o.d.2.2 mm) were placed in contact with the palatal and the labial surface of the teeth approximately 2 mm from the enamel-cement junction, respectively. The transmitted light throught the teeth was guided to the CdS-CdSe photoconductive cell (peak sensitivity 560nm) via the optical fiber. The results indicated that our method can detect the root pulp blood flow as far as app.2 mm from the enamel-cement junction.

为了构建最佳的透射光检测系统，采用分光光度计对人拔牙和人外周血在400 ~ 800 nm范围内的透光特性进行了研究。采用钨白炽灯和CdS-CdSe光导电池分别作为光源和光电探测器。光谱分析表明，其波长短于600 nm的光比波长长的光更容易被血液吸收。采用透射光光容积描记法（TLP）对健康志愿者的重要上颌中切牙进行了扫描。使用三种不同的光源（钨丝灯、峰值为565 nm的LED （LED565）和峰值为695 nm的LED (LED695)）作为光源。光照射在牙冠的腭面，透射光从唇侧收集。采用Cds-CdSe光导电池作为光电探测器。LED565在大多数检查牙齿上观察到脉冲波，但钨光和LED695难以识别脉冲波，结果表明LED565适用于牙髓TLP。然后，对该方法的根髓血流检测面积进行了评估。取人上中切牙测定光的透射面积。LED（强度峰值565 nm）和光纤（o.d.2.2 mm）分别放置在离牙釉质-骨水泥连接处约2mm的牙齿腭面和唇面接触处。透射光通过牙齿通过光纤引导到CdS-CdSe光导电池（峰值灵敏度560nm）。结果表明，该方法可以检测到离牙釉质-骨水泥接点约0.2 mm的根髓血流。