| 摘要 |
A method of measuring the distance of a probe in a cavity in a root canal of a tooth, comprising: supplying at least one first voltage waveform to the probe via a resistor; receiving at least one signal responsive to the position of the probe and the at least one first voltage waveform; generating two response waveforms from said at least one signal, at least one of said response waveforms having at least a primary frequency component and a substantial amount of at least one other non-zero frequency component; and estimating the distance of the probe from the apex utilizing both generated waveforms.
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