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Root apex position detection method

a detection method and apex technology, applied in the field of root apex position detection apparatus, can solve the problems of over distance contain an error, measured value contains an error, dentist may damage the root apex,

Inactive Publication Date: 2008-11-13
TOEI ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the root apex position is not accurately detected, the above distance will contain an error.
If the dentist performs treatment trusting the distance containing the error, the dental pulp and nerve or infected dentin or foreign bodies may be left in the root canal, or the dentist may damage the root apex during operation.
If, however, the state inside the root canal of the tooth does not satisfy the specific conditions, the measured value contains an error.
However, the marks adjacent to the root apex position only indicate that the measurement electrode is located around the root apex position, but cannot indicate how far the measurement electrode is away from the root apex position.

Method used

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Experimental program
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first embodiment

[0024]the present invention will be described below with reference to the views of the accompanying drawing.

[0025]Referring to FIG. 1, a power supply 1 outputs a plurality of types of measurement signals Pn. The measurement signals Pn can be signals of two different frequencies of, e.g., 500 Hz and 2 kHz. The measurement signals Pn can be signals of three or more types of frequencies. The measurement signals Pn can be signals which differ from each other in at least one of frequency, waveform, or peak value. According to the invention of the present application, it is necessary to detect a plurality of types of electrical characteristic values between a measurement electrode 10 and a mouth electrode 11 on the basis of a plurality of types of measurement signals Pn, and the types of the signals can be selected on the basis of the principle of the invention of the present application to be described below.

[0026]In addition, although the measurement signals Pn are applied to the measur...

second embodiment

[0072]By improving the second embodiment, a state wherein the distal end of the measurement electrode 10 approaches the root apex position 23 can be detected more precisely. An example of this improvement is that an intra-root-canal-position-specific model data at least a point between point a1 and point a2 spaced apart by 1 mm is calculated by using an intra-root-canal-position-specific model data at the point a1 and an intra-root-canal-position-specific model data at the point a2 which are stored in the storage unit 9. By using this calculated approximate data as the above intra-root-canal-position-specific model data, the position of the distal end of the measurement electrode 10 can be detected more accurately.

[0073]The third embodiment will be described. As shown in FIG. 4, the third embodiment uses three types of data. Referring to FIG. 4, the data indicated on the ordinate are quantified values, the data marked with the crosses represent the values of measured data with a mea...

fifth embodiment

[0104]By generating the intra-root-canal-position-specific model data of the model tooth 24′ at 1-mm intervals from the root apex position, the fifth embodiment can detect in a resolution of 1 mm how the distal end of the measurement electrode 10 approaches the root apex position 23′.

[0105]The third function will be described next. The third function is to more precisely detect how the distal end of the measurement electrode 10 approaches the root apex position 23. The third function detects and displays that the distal end of the measurement electrode is located at least one position anywhere between positional in the root canal 22′ of the model tooth 24′ and position a2 ahead of the point a1.

[0106]The third function can use an electrical characteristic value change pattern of a test tooth. FIGS. 8 and 9 show examples of electrical characteristic value change patterns of a test tooth. For a model tooth 24′ whose root canal 22′ has an inverted conical shape, FIG. 8 shows the change ...

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Abstract

Methods of detecting a root apex position of a root canal of a test tooth, including applying a plurality of types of measurement signals to one of the measurement electrode and the mouth electrode; sequentially applying each of the plurality of types of measurement signals to one of the measurement electrode and the mouth electrode; sequentially detecting a plurality of electrical characteristic values between the measurement electrode and the mouth electrode based on each of the applied measurement signals using a detection unit. The methods further include obtaining a test tooth data group; comparing the test tooth data group with a plurality of model tooth data groups; detecting whether one of the plurality of model tooth data groups is in a predetermined relationship with the test tooth data group; and displaying the detected result.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 11 / 297,993, filed Dec. 9, 2005, herein incorporated by reference in its entirety, which is a continuation application of International Patent Application No. PCT / JP2004 / 007046, filed May 18, 2004, herein incorporated by reference in its entirety, which was published under PCT Article 21(2) in Japanese.[0002]This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2003-167008, filed Jun. 11, 2003, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0003]1. Field of the Invention[0004]The present invention relates to a root apex position detection apparatus which is used to measure root canal length in dental diagnosis and treatment.[0005]2. Description of the Related Art[0006]When treating a tooth, a dentist sometimes needs to remove the dental pulp and nerve in the root canal....

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61C19/06A61C19/04
CPCA61C19/042A61C19/04
Inventor SHOJI, SHIGERUOTSUKA, MASAHIRO
Owner TOEI ELECTRIC
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