Development of a device for determining the root canal contamination

开发根管污染测定装置

• 批准号: 07557270
• 负责人: IKAWA Motohide
• 金额: $ 1.15万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07557270/
• 关键词: root canal; contamination; optical measurement; 光測定

The purpose of this study was to design a device which determines the root canal contamination by analyzing the color of the reflected light from the canal wall.1.The spectrum analysis was made with the reflected light from the enlarged canal wall and the dirty one. The spectrum pattern with the enlarged canal wall was similar to that obtained with the light source, while that with the dirty one showed a tendency of the increased light intensity at wavelengths longer than 600nm.2.The reflected light intensities at 560nm and 650nm were measured on the enlarged canal wall and the dirty one. There was a difference of the ratio of the light intensities at these wavelengths between the enlarged and the dirty.3.A trial device for determining the root canal contamination was made, and its clinical applicability was examined. The light source was a white light, and an optical probe which illuminated and collected the reflected light laterally to its long axis was used. The device simultaneously measured the light intensities at 560nm and 650nm using 2 photo-diodes and compared them at the same time, and expressed the color of the reflected light from the sample by the polarity and amplitude of the output signal. The polarity of the output was the same between those obtained with a blue color board, a white color board, and a clean tooth surface. While, a red color board and a dirty tooth surface produced the opposite polarity to that obtained with the clean tooth surface. A large output signal amplitude was obtained when the tooth surface was dyed red.The results obtained in this study indicated that the trial device could develop as a root canal contamination detector. The detection system could improve with the modification of the system such as the selection of wavelengths of the light, use of a laser light, the alteration of the signal processing, and dying the tooth.

本研究的目的是设计一种通过分析根管壁反射光的颜色来判断根管污染的装置。1.对根管扩大壁和污染壁的反射光进行光谱分析。实验结果表明：（1）扩大管壁的光谱图与光源的光谱图相似，而脏管的光谱图在波长大于600 nm处有光强增加的趋势。（2）测量了扩大管壁和脏管壁在560 nm和650 nm处的反射光强。3.制作了根管污染度检测装置，并对其临床应用进行了验证。光源是白色光，并且使用光学探针，该光学探针照射并收集横向于其长轴的反射光。该装置利用2个光电二极管同时测量560nm和650nm处的光强并进行比较，通过输出信号的极性和幅度来表示样品反射光的颜色。输出的极性在用蓝色板、白色板和清洁牙齿表面获得的那些之间是相同的。而红色色板和脏齿面产生的极性与干净齿面相反。当牙齿表面被染成红色时，可获得较大的输出信号幅度，实验结果表明，该装置可作为根管污染检测仪。检测系统可以通过系统的修改来改进，例如光的波长的选择、激光的使用、信号处理的改变以及牙齿的染色。