公开(公告)号：US4447206A

公开(公告)日：1984-05-08

申请号：US454873

申请日：1982-12-30

Applicant: Junji Ushiyama

Inventor： Junji Ushiyama

IPC: A61C5/02 ,  A61C19/04 ,  A61C3/00

CPC classification number: A61C5/02 ,  A61C19/04 ,  A61C19/042

Abstract: A novel and improved system is provided for detecting the apical constriction in the root canal of a tooth, in which the root canal, from which the dental pulp has been removed, is filled with electrolyte solution, a first electrode is put in contact with the mucous membrane in the oral cavity, a second electrode is put in the root canal, a fixed voltage or current is applied between the first and second electrodes, and a third electrode having an insulating coating except for the tip thereof is inserted into the root canal to detect sudden change in the potential along the root canal, and this change is visually and/or audibly indicated to indicate the apical constriction.

Abstract translation: 提供了一种新颖改进的系统，用于检测牙齿根管中的顶端收缩，其中牙髓已被去除的根管被电解质溶液填充，第一电极与 口腔中的粘膜，将第二电极放入根管中，在第一和第二电极之间施加固定的电压或电流，并且将除了其末端之外具有绝缘涂层的第三电极插入根管 以检测沿根管潜力的突然变化，并且视觉和/或听觉地指示该变化以指示顶端收缩。