CN2899732Y - Detector for tooth root canal length - Google Patents
Detector for tooth root canal length Download PDFInfo
- Publication number
- CN2899732Y CN2899732Y CN 200620102676 CN200620102676U CN2899732Y CN 2899732 Y CN2899732 Y CN 2899732Y CN 200620102676 CN200620102676 CN 200620102676 CN 200620102676 U CN200620102676 U CN 200620102676U CN 2899732 Y CN2899732 Y CN 2899732Y
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- resistance
- circuit
- root canal
- canal length
- measuring instrument
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Abstract
The utility model relates to a teeth root canal length tester, which comprises a power source, a signal collection circuit, a signal treatment circuit and a display, wherein, the signal collection circuit is composed of a reference electrode and a detection electrode between which a human body resistance is formed; the signal treatment circuit is provided with a benchmark resistance to judge the differences between the human body resistance and the benchmark resistance and calculate the distance between the terminal part of the detection electrode and the apical foramen of tooth; the benchmark resistance is an equivalent resistance and connected with a benchmark calibrating circuit whose equivalent resistance is roughly equal to 6.5K OMEGA. A benchmark calibrating circuit is arranged in the utility model so as to eliminate the defects that the length measurement is not accurate resulting from the changes of the benchmark resistance along with the changes of the environmental conditions, so the utility model has a great economic value and practical value.
Description
(1) technical field
This utility model relates to a kind of root canal length measuring instrument.
(2) background technology
Root canal length measuring instrument is used for the mensuration of root canal length, to guarantee that the doctor holds sono-explorer accurately in root canal, improves the success rate of root canal.
The principle of sono-explorer electronic gauge is based on the scientific achievement in advance of Suzuki (1942) and Sunada (1962).1958, resistance value was constant between Japanese scholar Sunada application unidirectional current test finder's periodontal membrane and the oral mucosa, about 6.5k Ω.On this basis, resistor-type apical foramen of tooth analyzer is manufactured to come out and introduces to the market.One end of root canal measurement is that port chamber hook links to each other with oral mucosa, and the other end links to each other with root-canal broach (file).When root-canal broach enters into the root pipe, and approach apical foramen of tooth, touch the periodontal tissue at apical foramen of tooth place up to its tip, this circuit has promptly formed the loop.The resistance of root canal measurement is when resistance between the sharp oral cavity mucosa of root-canal broach (file) reaches consistent now, and instrument shows that root-canal broach has reached apical foramen of tooth.Above-mentioned sono-explorer electronic gauge can only be judged the terminal point of root-canal broach, but can't draw the length of root pipe in real time.Relevant patent documentation has CN86108611 etc.
The current stomatology paper of delivering has comprised a large amount of relevant this kind of the raising accuracy of instruments and the content of endodontic treatment equipment.The root marrow is dry more, and most apparatus measures results are more accurate.But in the middle of practical operation, people normally to a humidity, that have vital pulp, with hemorrhage, secretions arranged or measure with the root pipe that sodium hypochlorite washed.These materials have just become electric conductor, have caused circuit to produce inaccurate reaction.Therefore, the measurement result under this environment is inaccurate.
The root canal length measuring instrument of the latest generation of current development, comprise power supply, signal acquisition module, signal processing module, display, signal acquisition circuit is made up of reference electrode and exploring electrode, form human body resistance between reference electrode and the exploring electrode, reference electrode adopts the oral cavity hook usually, exploring electrode adopts reamer usually, and signal acquisition circuit connects signal processing circuit; Described signal processing circuit is provided with reference resistance, and signal processing circuit is judged the difference of human body resistance and reference resistance, and calculates the distance between exploring electrode end and the apical foramen of tooth.Based on electrolytical electrical conductivity in the root pipe is certain value under given conditions, can calculate distance between root-canal broach and the apical foramen of tooth by the difference of human body resistance and reference resistance.That this root canal measurement can be used to measure is moist, that have pulp tissue, with root pipe hemorrhage, that secretions is arranged or washed with sodium hypochlorite.But in the practical operation, because reference resistance is a certain value, the temperature of environment, humidity variation can cause the variation of reference resistance, again because sono-explorer generally only is several millimeters, the minor variations of reference resistance all can cause the linear measure longimetry of root pipe inaccurate, thereby has limited the practical application of this root canal measurement.
(3) utility model content
This utility model purpose is to provide a kind of root canal length measuring instrument that accurately, is not subjected to environmental influence of measuring.
Root canal length measuring instrument described in the utility model, comprise power supply, signal acquisition circuit, signal processing circuit, display, described signal acquisition circuit is made up of reference electrode and exploring electrode, form human body resistance between described reference electrode and the exploring electrode, signal acquisition circuit connects signal processing circuit; Described signal processing circuit is provided with reference resistance, and signal processing circuit is judged the difference of human body resistance and reference resistance, and calculates the distance between exploring electrode end and the apical foramen of tooth; Described reference resistance is an equivalent resistance, and reference resistance is connected with the reference calibration circuit, and the equivalent resistance of described reference calibration circuit is substantially equal to 6.5K Ω.
Further, described reference calibration circuit is made up of placed in-line resistance and electric capacity.
Further, described switch is a gate-controlled switch.
Further, described signal processing circuit also is connected with acoustical generator.
Described reference electrode is generally the oral cavity hook.
Described exploring electrode is generally reamer.
Root canal length measuring instrument described in the utility model changes the inaccurate defective of linear measure longimetry that causes by the reference calibration circuit is set thereby eliminated the reference resistance that causes owing to changes in environmental conditions, has great economic worth and practical value.
(4) description of drawings
Fig. 1 is the signal processing flow figure of embodiment 1 described root canal length measuring instrument.
Fig. 2 is the circuit diagram of embodiment 1 described signal processing module.
(5) specific embodiment
The utility model is described in further detail below in conjunction with embodiment, but protection domain of the present utility model is not limited to this.
With reference to Fig. 1, Fig. 2, a kind of root canal length measuring instrument, comprise power supply, signal acquisition circuit, signal processing circuit, display, signal acquisition circuit is made up of reference electrode and exploring electrode, form human body resistance between reference electrode and the exploring electrode, signal acquisition circuit connects signal processing circuit; Signal processing circuit is provided with reference resistance, and signal processing circuit is judged the difference of human body resistance and reference resistance, and calculates the distance between exploring electrode end and the apical foramen of tooth; Reference resistance is an equivalent resistance, and reference resistance is connected with the reference calibration circuit by gate-controlled switch K, and the reference calibration circuit is made up of placed in-line resistance R and capacitor C, capacitor C ground connection.
Signal processing circuit is connected with acoustical generator.Reference electrode is selected the oral cavity hook for use, and exploring electrode is selected reamer for use.Signaling interface J1 connects signal acquisition circuit.
When described root canal length measuring instrument is applied to measure, earlier gate-controlled switch K is connected the reference calibration circuit, this moment, reference resistance obtained calibration, connection signal Acquisition Circuit again, the oral cavity is suspended to human body bicker place, reamer inserts tooth, shows the active length of root canal this moment on the display in real time.
Claims (6)
1, a kind of root canal length measuring instrument, comprise power supply, signal acquisition circuit, signal processing circuit, display, described signal acquisition circuit is made up of reference electrode and exploring electrode, form human body resistance between described reference electrode and the exploring electrode, signal acquisition circuit connects signal processing circuit; Described signal processing circuit is provided with reference resistance, and signal processing circuit is judged the difference of human body resistance and reference resistance, and calculates the distance between exploring electrode end and the apical foramen of tooth;
It is characterized in that: described reference resistance is an equivalent resistance, and reference resistance is connected with the reference calibration circuit, and the equivalent resistance of described reference calibration circuit is substantially equal to 6.5K Ω.
2, root canal length measuring instrument as claimed in claim 1 is characterized in that described reference calibration circuit is made up of placed in-line resistance and electric capacity.
3, root canal length measuring instrument as claimed in claim 2 is characterized in that described switch is a gate-controlled switch.
4,, it is characterized in that described signal processing circuit also is connected with acoustical generator as the described root canal length measuring instrument of one of claim 1～3.
5, root canal length measuring instrument as claimed in claim 4 is characterized in that described reference electrode is the oral cavity hook.
6, root canal length measuring instrument as claimed in claim 4 is characterized in that described exploring electrode is a reamer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620102676 CN2899732Y (en) | 2006-04-14 | 2006-04-14 | Detector for tooth root canal length |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620102676 CN2899732Y (en) | 2006-04-14 | 2006-04-14 | Detector for tooth root canal length |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2899732Y true CN2899732Y (en) | 2007-05-16 |
Family
ID=38083898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620102676 Expired - Fee Related CN2899732Y (en) | 2006-04-14 | 2006-04-14 | Detector for tooth root canal length |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2899732Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110559091A (en) * | 2019-09-29 | 2019-12-13 | 中国人民解放军陆军军医大学第一附属医院 | Dental handpiece with auxiliary distance measuring and depth fixing functions |
-
2006
- 2006-04-14 CN CN 200620102676 patent/CN2899732Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110559091A (en) * | 2019-09-29 | 2019-12-13 | 中国人民解放军陆军军医大学第一附属医院 | Dental handpiece with auxiliary distance measuring and depth fixing functions |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |