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A STUDY ON DIAGNOSITIC METHODES OF DENTAL PULP BY PULSE OXIMETRY IN YOUNG PERMANENT TEETH AND DECIDUOUS TEETH

年轻恒牙和乳牙牙髓脉搏血氧饱和度诊断方法的研究

基本信息

批准号：
10671929
负责人：
MIWA Zenzo
金额：
$ 2.11万
依托单位：
Tokyo Medical and Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

In this study, we succeeded to record transmitted-light photoplethysmography (TLP) from the dental pulp in young humans and examined its applicability to pulp vitality test. Upper central incisors of one adult and six children were used for this investigation. A resin cap of the examined tooth was prepared on the plaster model of the subjects' upper arch. A green light-emitting diode( LED, peak power at 525nm) illuminated the palatal surface of the examined tooth via an optical fiber attached to the individual resin cap, and the transmitted-light through the pulp was picked up from the labial surface of the tooth. The intensity of the transmitted-light was guided to a CdS photoconductive cell (peak sensitivity at 550nm), and its intensity change was recorded as TLP through AC-coupled amplifier together with the finger plethysmography of the subjects. Recordings were made with and without opaque black rubber dam application in a dark room. In one subject, 2% lidocaine solution containing 1/80,000 epinephrine was periapically infiltrated and the transition of the amplitude of the TLP was observed. Results obtained were as follows : 1) TLP, synchronous with the finger plethysmography, was recognized from sound permanent teeth of an adult and the young subjects. The signal amplitude of the TLP was larger and the waveform was much more clearer with the young subjects. 2) TLP was slightly recorded from luxated teeth which did not respond to electrical stimulation to the pulp. But with an implanted tooth no obvious pulse wave was detected. 3) The dam application did not produce a significant signal reduction. 4) Periapical infiltration of 2%LE produced a gradual decrease of the amplitude of TLP and then was followed by an increase. Results indicated that TLP is considered to reflect pulpal haemodynamics and this system would be useful for the diagnosis of pulpal vitality of the young permanent teeth without eliciting any pain sensation.

在这项研究中，我们成功记录了年轻人牙髓的透射光光电体积描记法（TLP），并检查了其在牙髓活力测试中的适用性。本次调查使用了一名成人和六名儿童的上中切牙。在受试者上牙弓的石膏模型上制备被检查牙齿的树脂帽。绿色发光二极管（LED，峰值功率为 525 nm）通过连接到单个树脂帽的光纤照亮被检查牙齿的腭表面，并从牙齿的唇表面拾取穿过牙髓的透射光。透射光的强度被引导至CdS光电导电池（峰值灵敏度为550nm），并且其强度变化通过AC耦合放大器连同受试者的手指体积描记法被记录为TLP。录音是在暗室中使用或不使用不透明黑色橡胶坝进行的。在一名受试者中，将含有 1/80,000 肾上腺素的 2% 利多卡因溶液渗入根尖周，观察 TLP 振幅的转变。获得的结果如下： 1）与手指体积描记法同步，从成人和年轻受试者的健康恒牙中识别出TLP。年轻受试者的TLP信号幅度更大，波形更清晰。 2) TLP 是从对牙髓电刺激没有反应的脱位牙齿中轻微记录的。但对于植入的牙齿，没有检测到明显的脉搏波。 3) 大坝应用并未产生明显的信号减弱。 4) 2%LE的根尖周浸润使TLP的幅度逐渐减小，然后又增大。结果表明，TLP 被认为反映了牙髓血流动力学，该系统可用于诊断年轻恒牙的牙髓活力，且不会引起任何疼痛感。