CN109452981B - Induction heating's gutta-percha fills appearance - Google Patents
Induction heating's gutta-percha fills appearance Download PDFInfo
- Publication number
- CN109452981B CN109452981B CN201811604586.7A CN201811604586A CN109452981B CN 109452981 B CN109452981 B CN 109452981B CN 201811604586 A CN201811604586 A CN 201811604586A CN 109452981 B CN109452981 B CN 109452981B
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- Prior art keywords
- piston
- metal tube
- gutta
- mounting cavity
- percha
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- 239000000899 Gutta-Percha Substances 0.000 title claims abstract description 51
- 240000000342 Palaquium gutta Species 0.000 title claims abstract description 51
- 229920000588 gutta-percha Polymers 0.000 title claims abstract description 51
- 230000006698 induction Effects 0.000 title claims abstract description 48
- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 63
- 238000002347 injection Methods 0.000 claims description 22
- 239000007924 injection Substances 0.000 claims description 22
- 238000007789 sealing Methods 0.000 claims description 21
- 239000003292 glue Substances 0.000 claims description 18
- 239000004033 plastic Substances 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 description 14
- 230000005669 field effect Effects 0.000 description 8
- 238000009434 installation Methods 0.000 description 7
- 210000004262 dental pulp cavity Anatomy 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/50—Implements for filling root canals; Methods or instruments for medication of tooth nerve channels
- A61C5/55—Implements for filling root canals; Methods or instruments for medication of tooth nerve channels with heating means, e.g. for heating gutta percha
Landscapes
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- General Induction Heating (AREA)
Abstract
The invention relates to an induction heating gutta-percha filling instrument, which comprises a high-frequency inverter power supply, an induction coil and a metal tube, wherein the induction coil is wound outside the metal tube, the high-frequency inverter power supply comprises a direct-current power supply and a high-frequency inverter circuit, the direct-current power supply supplies power to the induction coil through the high-frequency inverter circuit, gutta-percha is placed in the metal tube when in use, the high-frequency inverter power supply generates alternating current with the frequency of 100KHz to 500KHz after the direct-current power supply is turned on, and the metal tube heats after passing through the induction coil so as to soften the gutta-percha in the metal tube.
Description
Technical Field
The invention relates to the technical field of dental equipment, in particular to an induction heating gutta-percha filling instrument.
Background
In endodontic procedures, after a tooth root canal is enlarged and cleaned, it is necessary to fill the root canal with gutta-percha to prevent the root canal from being re-infected. The gutta-percha filling instrument can heat gutta into a molten state and inject the gutta-percha into a root canal of a tooth through a needle tube. This method is known as hot melt gutta percha filling and is capable of adapting to the shape of the root canal, including the lateral branches, and filling.
In the using process of the gutta-percha filling instrument, a solid gutta-percha rod is firstly filled, then the gutta-percha rod is heated to a molten state by heat generated by the instrument, and then the gutta-percha is extruded by a push rod and filled into a root canal. The traditional gutta-percha filling instrument is generally provided with a metal tube for loading gutta-percha, and a resistance wire or a resistance film is adopted to heat the metal tube, and then heat is conducted to the gutta-percha to soften the gutta-percha. The heating efficiency of this heat conduction mode is lower, and a considerable portion of the heat can be dissipated into the air, and the heating mode speed of heat conduction is slower, because as the gutta percha temperature increases, the temperature difference between the resistance wire and the gutta percha becomes smaller, and the heat transfer speed significantly decreases. In addition, in actual production, the resistance wire is difficult to closely adhere to the metal tube, and the heating speed is also reduced. This results in long heating times and excessive power consumption, which is more pronounced in some battery-powered gutta percha filling machines.
Disclosure of Invention
The invention aims to solve the technical problem of providing the gutta-percha filling instrument which has a simple structure and high heating efficiency and can perform induction heating.
In order to solve the technical problems, the induction heating gutta-percha filling instrument comprises a high-frequency inverter power supply, an induction coil and a metal tube, wherein the induction coil is wound outside the metal tube, the high-frequency inverter power supply comprises a direct-current power supply and a high-frequency inverter circuit, the direct-current power supply supplies power to the induction coil through the high-frequency inverter circuit, gutta-percha is placed in the metal tube when in use, the high-frequency inverter power supply generates alternating current with the frequency of 100KHz to 500KHz after the direct-current power supply is turned on, and the metal tube heats after passing through the induction coil so as to soften the gutta-percha in the metal tube.
Further, the induction heating gutta-percha filling instrument further comprises a piston cylinder, the metal tube is in plug-in fit with the piston cylinder, and the induction coil is arranged outside the piston cylinder or between the piston cylinder and the metal tube, and the gutta-percha is arranged in the metal tube in use.
Further, the induction heating gutta-percha filling instrument further comprises a piston push rod, wherein the piston push rod is in plug-in fit with the tail end of the metal tube, so that the piston push rod can push out melted gutta-percha in the metal tube.
Further, the piston cylinder is internally provided with a front mounting cavity, a piston cavity and a rear mounting cavity in sequence, the metal tube comprises a metal tube body and a limiting ring table protruding from the metal tube body, the metal tube body is in plug-in fit with the piston cavity, the front end of the metal tube body extends into the front mounting cavity, and the limiting ring table is arranged in the rear mounting cavity.
Further, the induction heating gutta-percha filling instrument further comprises a glue injection needle and a piston end cap, wherein the piston end cap comprises an end cap body, the tail part of the end cap body is provided with a metal tube inserting groove matched with the metal tube, and the front end of the end cap body is provided with a glue injection needle connecting cylinder suitable for inserting the glue injection needle, so that the liquid gutta-percha in the metal tube can be pushed out of the glue injection needle.
Further, the gutta-percha filling instrument further comprises a front end locking nut in threaded fit with the front mounting cavity, a nut through hole which is suitable for the glue injection needle connecting cylinder to penetrate through is arranged in the center of the front end locking nut, and the front end locking nut is in threaded connection with the front mounting cavity and used for compressing the piston end cap during assembly.
Further, the gutta-percha filling instrument further comprises a rear end locking nut in threaded fit with the rear mounting cavity, a rear end locking nut through hole which is suitable for the piston push rod to pass through is arranged in the center of the rear end locking nut, and the rear end locking nut is in threaded connection with the rear mounting cavity during assembly and is used for compressing a rear end sealing ring.
The invention has the technical effects that: (1) Compared with the prior art, the induction heating gutta-percha filling instrument disclosed by the invention has the advantages that the heating speed is high and the efficiency is high compared with a resistance wire heating mode, the gutta-percha filling instrument can soften gutta-percha in a short time, and the non-contact heating mode can greatly utilize heat energy; the high-frequency inverter circuit can provide high-frequency alternating current for the induction coil and has the characteristics of compact structure, high conversion efficiency and high stability; the piston end cap is arranged to be detachable, is connected with the metal tube through the front end locking nut, is convenient to replace and detach, and the glue injection needle is a stainless steel glue injection needle, so that the cost is low, and the glue injection and the piston end cap become disposable articles, and are clean and sanitary.
Drawings
The invention is described in further detail below with reference to the drawings of the specification:
FIG. 1 is a schematic perspective view of a metal tube, a high frequency inverter power supply, and an induction coil of the present invention;
Fig. 2 is a circuit configuration diagram of the high-frequency inverter power supply of the present invention;
FIG. 3 is a schematic perspective view of the gutta-percha filling device of the present invention;
FIG. 4 is a schematic cross-sectional view of the gutta-percha filling device of the present invention;
Fig. 5 is a schematic cross-sectional view of a piston cylinder according to the present invention.
In the figure: the high-frequency inverter power supply comprises a high-frequency inverter power supply 1, an induction coil 2, a metal tube 3, gutta-percha 4, a piston cylinder 5, a front mounting cavity 51, a piston cavity 52, a rear mounting cavity 53, an annular bottom wall 54, a front sealing ring 6, a piston end cap 7, a front locking nut 8, a rear sealing ring 9, a rear locking nut 10, a piston push rod 11, a glue injection needle 12, a first choke inductor L1, a second choke inductor L2, a resonant capacitor C3, a first N-channel field effect tube Q3, a second N-channel field effect tube Q4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first clamping diode D1, a second clamping diode D2, a first recovery diode D3 and a second recovery diode D4.
Detailed Description
Embodiment 1 as shown in fig. 1 to 5, the induction heating gutta-percha filling instrument of the present embodiment includes a piston cylinder 5, a metal tube 3, a piston push rod 11, a glue injection needle 12 and a piston end cap 7, wherein the piston cylinder 5 is formed by integral injection molding of ceramic or plastic, and a front mounting cavity 51, a piston cavity 52 and a rear mounting cavity 53 are sequentially arranged in the piston cylinder, wherein the inner diameter of the piston cavity 52 is smaller than the inner diameters of the front mounting cavity 51 and the rear mounting cavity 53, the front mounting cavity 51 is used for assembling the piston end cap, and the rear mounting cavity 53 is used for assembling the piston push rod 11.
The metal tube 3 comprises an integrally formed metal tube body and a limiting ring table, the limiting ring table is arranged at the tail end of the metal tube body, the inner diameter of the rear mounting cavity 53 is larger than that of the piston cavity 52, so that an annular bottom wall 54 is formed between the rear mounting cavity 53 and the piston cavity 52, the outer wall of the metal tube body is in small clearance fit with the inner wall of the piston cavity 52 during assembly, when the metal tube body is inserted into the piston cavity 52, the inner side surface of the limiting ring table is tightly attached to the annular bottom wall, and the tail of the piston cavity 52 is sealed by the limiting ring table.
In order to perform induction heating on the metal tube 3, the induction coil 2 is sleeved outside a piston cavity 52 of the piston cylinder 5, the induction coil 2 is powered by a high-frequency inverter power supply, the high-frequency inverter power supply comprises a direct-current power supply and a high-frequency inverter circuit, the high-frequency inverter circuit comprises a resonance capacitor C3 connected with the induction coil 2 in parallel and a second inductor L2 connected with the induction coil 2 and the resonance capacitor C3 in series, the high-frequency inverter circuit further comprises a first inductor L2 connected with the resonance capacitor C3, the induction coil L2 and the resonance capacitor C3 in parallel, the high-frequency inverter circuit further comprises a first charge-discharge circuit consisting of a first N-channel field effect transistor Q3, a second resistor R2, a third resistor R3, a first clamping diode D1 and a first recovery diode D3, and a second charge-discharge circuit consisting of a second N-channel field effect transistor Q4, a first resistor R1, a fourth resistor R4, a second clamping diode D2 and a second recovery diode D4, wherein the first inductor L1 and the second inductor L2 act as chokes; the working process of the high-frequency inverter circuit comprises the following steps: after the power is on, because of the choke action of the first inductor L1 and the second inductor L2, the voltages Ua and Ub acting on the first N-channel field effect transistor Q3 and the second N-channel field effect transistor Q4 slowly rise, and because each N-MOS transistor has parameter difference in the production process, the conduction speeds of the first N-channel field effect transistor Q3 and the second N-channel field effect transistor Q4 are different. Assuming that the first N-channel fet Q3 is turned on faster than the second N-channel fet Q4, the first N-channel fet Q3 is turned on first so that the voltage ua=0; meanwhile, the G-pole voltage g2=0 of the second N-channel fet Q4, at this time, the second N-channel fet Q4 is turned off, and the resonant capacitor C3 is charged; when the resonance capacitor C3 is full, the induction coil 2 is discharged, after the resonance capacitor C3 is discharged, the second N-channel fet Q4 is turned on, and the first N-channel fet Q3 is turned off, so that the induction coil 2 charges the resonance capacitor C3. Due to the alternating on and off of the first N-channel fet Q3 and the second N-channel fet Q4, a high frequency resonant current is formed between the resonant capacitor C3 and the induction coil 2. The resonant frequency is determined by the resonant capacitor C3 and the induction coil 2, and the calculation formula is as follows:
In the example, the capacitance value C=300 nF of the resonance capacitor C3 is selected, the inductance value L=0.6 uH of the induction coil 2 is selected, and the resonance frequency f=375.13 KHz is obtained; by adjusting the change of the capacitance value C or the inductance value L, an alternating current with a frequency of 100KHz to 500KHz can be obtained, and specifically, for example, the capacitance value of the resonant capacitor C3 is adjusted to c=350 nF, the inductance value L of the induction coil 2=0.29 uH, and then the resonant frequency f 0 =499.55 KHz; the resonance frequency f 0 =100.26 KHz is set by adjusting the capacitance value of the resonance capacitor C3 to c=900 nF and the inductance value l=2.8 uH of the induction coil 2.
The front end of the metal pipe body stretches into the front mounting cavity 51, the front end of the metal pipe body is sleeved with a front end sealing ring 6 for isolating the piston cavity 52 from the front end mounting cavity 51, and the front end sealing ring 6 is arranged in the front mounting cavity 51 and is close to the piston cavity, so that the front end sealing ring 6 seals and isolates the piston cavity 52; the afterbody of metal pipe 3 sets up with piston push rod 11 interference fit's rear end sealing washer 9, piston push rod 11's front end stretches into in the sleeve body after passing rear end sealing washer 9, rear end sealing washer 9 is compressed tightly fixedly by with rear end locking nut 10 of rear installation chamber 53 screw-thread fit, rear end locking nut 10's center sets up the rear end locking nut through-hole that is suitable for piston push rod 11 to pass, rear end locking nut 10's outer wall sets up the external screw thread, rear installation chamber 53's inner wall sets up the internal screw thread, rear end locking nut 10 and rear installation chamber 53 screw-thread connection during the assembly, piston push rod 11's tail end stretches out rear end locking nut 10 setting, and piston push rod 11's tail end and the power unit cooperation of peripheral hardware, make piston push rod 11 can remove in metal pipe 3 and piston push rod 11's tail end can not break away from metal pipe 3, rear end locking nut 10 screw down rear end sealing washer 9 the lateral surface at the spacing ring platform, seal the clearance between piston push rod 11 and piston chamber 52 by rear end sealing washer 9.
The piston end cap 7 comprises an end cap body, wherein the front end of the end cap body is provided with a glue injection needle connecting cylinder suitable for inserting the glue injection needle 12, and the glue injection needle 12 can be fixed in a gluing or crimping mode after being inserted into the glue injection needle connecting cylinder, so that the glue injection needle 12 is fixedly connected with the piston end cap 7; the afterbody of end cap body sets up the tubular metal resonator jack-in groove with tubular metal resonator 3 looks adaptation, piston end cap 7 is fixed by front end locking nut 8 in preceding installation cavity 51, the center of front end locking nut 8 sets up the nut through-hole that is suitable for the injecting glue needle connecting cylinder to pass, the outer wall of front end locking nut 8 sets up the external screw thread, the inner wall of front installation cavity 51 sets up the internal screw thread, front end locking nut 8 and preceding installation cavity 51 threaded connection during the assembly, by front end locking nut 8 with piston end cap 7 impress preceding installation cavity 51 for tubular metal resonator 3 inserts the tubular metal resonator jack-in groove.
The piston push rod 11 can be made of stainless steel or enamel, and has smooth surface and difficult deformation. The front end sealing ring 6 and the rear end sealing ring 9 are PEEK sealing rings (namely polyether ether ketone sealing rings) or PTFE sealing rings (namely polytetrafluoroethylene sealing rings), have excellent new performances of sliding wear resistance and fretting wear resistance, can particularly keep high wear resistance and low friction factor at 250 ℃, and avoid influencing the performances of the front end sealing ring 6 and the rear end sealing ring 9 when gutta-percha is heated.
When in use, the gutta-percha 4 is placed in the metal tube 3, a direct-current power supply is started, and alternating current with the frequency of 100KHz to 500KHz is obtained on the induction coil 2 through the high-frequency inverter circuit, so that the metal tube 3 rapidly and uniformly heats to soften the gutta-percha 4 in the metal tube 3, and the piston push rod 11 is pushed, so that the melted gutta-percha is extruded by the glue injection needle 12.
Example 2
On the basis of example 1, the induction heated gutta-percha filling machine of this example has the following modifications: the induction coil 2 is sleeved between the inner wall of the piston cavity and the outer wall of the metal tube 3.
It is apparent that the above examples are merely illustrative of the present invention and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious changes and modifications which come within the spirit of the invention are desired to be protected.
Claims (3)
1. The induction heating gutta-percha filling instrument is characterized by comprising a high-frequency inverter power supply, an induction coil and a metal tube, wherein the induction coil is wound outside the metal tube, the high-frequency inverter power supply comprises a direct-current power supply and a high-frequency inverter circuit, the direct-current power supply supplies power to the induction coil through the high-frequency inverter circuit, gutta-percha is placed in the metal tube when in use, the high-frequency inverter power supply generates alternating current with the frequency of 100KHz to 500KHz after the direct-current power supply is turned on, and the metal tube heats after passing through the induction coil so as to soften the gutta-percha in the metal tube;
The piston tube comprises a piston cavity, a front mounting cavity, a piston cavity and a rear mounting cavity, wherein the front mounting cavity, the piston cavity and the rear mounting cavity are sequentially arranged in the piston tube, the metal tube comprises a metal tube body and a limiting ring table which is arranged in a protruding mode, the metal tube body is in plug-in fit with the piston cavity, the front end of the metal tube body stretches into the front mounting cavity, the limiting ring table is arranged in the rear mounting cavity, and the front end of the metal tube body is sleeved with a front end sealing ring which is used for isolating the piston cavity and the front mounting cavity; the plastic injection device comprises a plastic injection needle, a piston end cap and a plastic injection needle connecting cylinder, wherein the plastic injection needle and the piston end cap are arranged on the plastic injection needle connecting cylinder; the front end locking nut is in threaded fit with the front mounting cavity, a nut through hole which is suitable for the glue injection needle connecting cylinder to pass through is arranged in the center of the front end locking nut, and the front end locking nut is in threaded connection with the front mounting cavity during assembly and is used for compressing the piston end cap; the rear end locking nut is in threaded fit with the rear mounting cavity, a rear end locking nut through hole which is suitable for a piston push rod to pass through is arranged in the center of the rear end locking nut, and the rear end locking nut is in threaded connection with the rear mounting cavity during assembly and is used for compressing a rear end sealing ring.
2. The induction heated gutta percha filling machine according to claim 1, wherein said metal tube is in plug-in fit with said piston cylinder, said induction coil being disposed outside said piston cylinder or said induction coil being disposed between said piston cylinder and said metal tube.
3. The induction heated gutta percha filling apparatus according to claim 2, further comprising a piston push rod, wherein said piston push rod is in plug-in fit with the tail end of said metal tube, so that said piston push rod can push out melted gutta percha in the metal tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811604586.7A CN109452981B (en) | 2018-12-26 | 2018-12-26 | Induction heating's gutta-percha fills appearance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811604586.7A CN109452981B (en) | 2018-12-26 | 2018-12-26 | Induction heating's gutta-percha fills appearance |
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| Publication Number | Publication Date |
|---|---|
| CN109452981A CN109452981A (en) | 2019-03-12 |
| CN109452981B true CN109452981B (en) | 2024-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811604586.7A Active CN109452981B (en) | 2018-12-26 | 2018-12-26 | Induction heating's gutta-percha fills appearance |
Country Status (1)
| Country | Link |
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| CN (1) | CN109452981B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110464487A (en) * | 2019-09-05 | 2019-11-19 | 刘亚洲 | A kind of gutta-percha heating instrument |
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| CN209422135U (en) * | 2018-12-26 | 2019-09-24 | 常州赛乐医疗技术有限公司 | A kind of gutta-percha filling instrument of induction heating |
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|---|---|---|---|---|
| DE2638595A1 (en) * | 1976-08-27 | 1978-03-02 | Heraeus Gmbh W C | High frequency induction melting small wt. of dental alloys - using surge in induction coil current to indicate liquidus temp. |
| CA1175262A (en) * | 1980-11-20 | 1984-10-02 | John T. Mcspadden | Dental tool |
| CN2737010Y (en) * | 2004-09-30 | 2005-10-26 | 张世泽 | Coaxial cable joint |
| CN201211244Y (en) * | 2008-07-08 | 2009-03-25 | 北京达雅鼎医疗器械有限公司 | Gutta-percha point cutter |
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| Publication number | Publication date |
|---|---|
| CN109452981A (en) | 2019-03-12 |
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