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Development of an ultrasonic device to detect early demineralized lesions and establishment of clinical criteria for these diagnoses

开发超声波装置来检测早期脱矿病变并建立这些诊断的临床标准

基本信息

批准号：
15592212
负责人：
KOSEKI Takeyoshi
金额：
$ 2.05万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15592212/
关键词：
Dental cries Ultrasonic Nondestructive test Diagnosis

项目摘要

The onset of dental caries is characterized by white-spots or staining on tooth surfaces. However, estimation of caries activities of these lesions is difficult because we have no tool for recognition which lesion is demineralizing, arresting or re-mineralizing. For detection of the initial changes of the tooth surface affected by dental caries on the enamel and root, we developed a noninvasive, nondestructive dental explorer employing ultrasonic sensor technology. The ultrasonic sensor detection system consists of an oscillating piezoelectric element for sensing, a piezoelectric detective element to obtain frequency characteristics of the tooth surface, and a lightweight arm for positioning the sensor on the tooth surface. Extracted teeth were collected with informed consent and demineralized enamel specimens were prepared with lactate-CMC gel (6%, pH 4.5). The ultrasonic sensor was loaded on these tooth surfaces and scanned for drawing a map of the frequency characteristics. The surface characteristics were represented by the frequency shifts of oscillation in the resonance method. The detecting element of the developed ultrasonic sensor was sufficiently small in the clinic. By measurements using four sets of enamel specimens, early lesions of enamel caries were dearly represented by low frequency shifts of oscillation in a demineralized time-dependent manner. By scanning surfaces of ten extracted teeth, this detection system was able to distinguish sound or caries lesions on the enamel and roots, calculus depositions, staining, white spots and cracks on the enamel surface. However, additional information was need when exploring complex surfaces with overlapping lesions. Our new sensory explorer employing the ultrasonic resonance method was found to be a powerful tool for estimating initial change and degree of progression of dental caries.

龋齿的发病特征在于牙齿表面上的白点或染色。然而，估计这些病变的龋齿活动是困难的，因为我们没有工具来识别哪些病变是脱矿，阻止或再矿化。为了检测牙釉质和牙根受龋齿影响的牙齿表面的初始变化，我们开发了一种采用超声波传感器技术的非侵入性、非破坏性牙科探测器。超声波传感器检测系统由用于传感的振荡压电元件、用于获得齿面频率特性的压电检测元件和用于将传感器定位在齿面上的轻质臂组成。在知情同意的情况下收集拔牙，用乳酸盐-CMC凝胶（6%，pH 4.5）制备脱矿牙釉质样本。将超声波传感器加载在这些齿面上并扫描以绘制频率特性图。在共振法中，表面特性由振荡的频移来表示。所研制的超声传感器的检测元件在临床上是足够小的。通过使用四组牙釉质样本进行测量，牙釉质龋的早期病变可以通过脱矿时间依赖性的低频振荡变化来清楚地代表。通过对10颗离体牙的表面扫描，该检测系统能够区分牙釉质和牙根上的健全或龋齿病变、牙结石沉积、牙釉质表面的染色、白色斑点和裂纹。然而，当探索具有重叠病变的复杂表面时，需要额外的信息。我们的新感官探险家采用超声波共振方法被发现是一个强大的工具，估计初始变化和发展程度的龋齿。