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    • 3. 发明申请
    • APICAL POSITION LOCATOR
    • 自动定位器
    • WO2007057878A3
    • 2009-04-30
    • PCT/IL2005001228
    • 2005-11-21
    • CROHN ILANLEVY JACOB
    • CROHN ILANLEVY JACOB
    • A61C19/04
    • A61C19/041A61C19/042
    • A method and system are disclosed for detecting an apical position depending on the change in the impedance between a first electrode inserted into the root canal of the tooth of a patient and a second external electrode applied to a body surface of the patient. According to some embodiments, a regulated current such as an alternating current having a substantially constant amplitude is supplied between the two electrodes, and this current serves as a measurement signal. Alternatively or additionally, the frequency of the time varying (e.g. alternating) current is at least 50 KHZ, and/or at most about 300 KHZ. In some embodiments, the presently disclosed device includes a processing unit which determines a capacitance-governed function when the first electrode is in the apical region, and which determined a function at least moderately governed by resistance when the electrode is in the dental neck region. Optionally, the first electrode inserted into the root canal is a dental file or reamer.
    • 公开了一种方法和系统,用于根据插入患者牙齿根管的第一电极和施加到患者体表的第二外部电极之间的阻抗变化来检测顶端位置。 根据一些实施例,在两个电极之间提供诸如具有基本上恒定振幅的交流电流的调节电流,并且该电流用作测量信号。 或者或另外,时变(例如交替)电流的频率为至少50KHZ,和/或至多约300KHZ。 在一些实施例中,本公开的装置包括处理单元,该处理单元在第一电极位于顶端区域时确定电容控制功能,并且当电极位于牙颈区域中时确定至少适度受电阻控制的功能。 任选地,插入根管的第一电极是牙锉或铰刀。