JP2000210305A - Syringe for housing gutta-percha - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a syringe for housing a gutta-percha which is capable of rapidly and easily heating and softening the gutta-percha by hot water at the front end housed in the syringe for injecting and packing the gutta-percha into a dental root when carrying out a dental root treatment in a dental therapy field, is capable of maintaining the gutta-percha in a softened state for a long time and is capable of injecting and packing the gutta-percha directly into the dental root by perceiving that the temperature of the gutta-percha attains a suitable temperature for packing by visual sensation. SOLUTION: A nozzle 3 made of plastic having flexibility is freely attachably and detachably mounted at the front end of a syringe body 1 which is extruded of the gutta-percha 5 housed therein by a plunger 2 and having thermal conductivity of <=20 W/m.k and a metal 1a for heat storage having specific heat of >=0.4 J/kg.K is fixed to the position on the inside surface at the front end of the syringe body 1 where the metal is pressed to the nozzle 3. The nozzle 3 consists of the structure provided with a reversible temperature indicating material to indicate that the temperature higher by the prescribed temperature than the softening temperature of the gutta-percha 5 is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental treatment field, in which a tip end rattle perforation housed in a syringe for injecting and filling into a root canal can be easily and quickly treated with hot water in performing a root canal treatment. A syringe for storing a rattle aperture that can be softened by heating, and that can be maintained in a softened state for a long time, and that the temperature of the rattle aperture can be directly injected into the root canal by visually recognizing that the filling temperature is at an appropriate temperature for filling. It is.

[0002]

2. Description of the Related Art When a root canal treatment is required due to tooth decay or the like, a dentist removes the dental pulp, enlarges and forms the root canal, and injects and fills the formed root canal with a filling material. In order to perform this treatment, the length of the root canal is measured in advance using an X-ray or the like, and a reamer or a file corresponding to the length of the root canal is selected. At this time, positioning according to the root canal length is performed using a stopper previously mounted on the reamer and the file. After that, several reamers and files in accordance with the ISO standard are used in order from the thinner one, and the root canal is enlarged and formed while taking time and effort.

[0003] Here, the dentist must be most careful in preventing the reamer or file from protruding from the tip (apical tip) of the root. This is because the inside of the root canal and the outside of the apex are completely different from a biological point of view. In other words, the inside of the root canal has not been activated much as a living body after removing the dental pulp, but the outside of the apex has been activated,
Various biological activities such as blood circulation, repair of destroyed cells, and biological defense by macrophages are performed.

[0004] After the root canal is enlarged and formed using a reamer, a file, or the like, and the inside and outside of the root canal are recognized as sufficiently satisfactory, the dentist removes the root canal filling from the apex. In order to perform such a filling operation carefully, the master point or accessory point, which is a solid backlash, was conventionally pushed into the root canal using a plugger or a sprayer. However, this requires 5 to 10 minutes per root canal. If the root canal is not completely sealed by filling the root canal with gutta-percha, bacteria will grow especially in the apical part and a cavity is formed in the tooth bone. Therefore, the dentist must perform this treatment operation with great care.

[0005] In order to perform such a treatment operation more easily, there is a method of heating and softening the backlash stored in the syringe together with the syringe, extruding a required amount thereof, and injecting and filling the root canal into the root canal. However, the conventional method requires a special and expensive heater for heating and softening the backlash through the syringe while the syringe containing the backlash is inserted and held in the syringe insertion hole, and The phenomenon that the once softened rattle perch cools and hardens during root canal treatment often becomes inoperable. When the backlash in the syringe has hardened in this way, the back-injected backlash must be removed from the root canal and refilled. When performing such a refilling operation, the time and labor is very large because the rattle aperture must be softened using a solution that dissolves the rattle aperture and the softened rattle aperture must be removed from the root canal. It was something.
In addition, when performing the refilling operation, a reheating time of about 10 minutes is required to soften the backlash by the heater through the syringe again, so that the workability is very poor. .

[0006]

SUMMARY OF THE INVENTION As described above, the present invention solves the above-mentioned drawbacks and provides a special and expensive heater for heating and softening the backlash stored in the syringe to a predetermined temperature. It is possible to heat the backlash stored in the syringe to a predetermined temperature with a short time heating using a simple heater that can obtain hot water without the need for hot water. The rest of the rattle aperture is not softened, so it does not cause damage to its quality, but also keeps the tip of the rattle aperture in a softened state for a long time, and the temperature of the rattle aperture becomes suitable for filling. It is an object of the present invention to provide a syringe for accommodating a gutter percha, which can be visually recognized to be able to fill the root canal directly.

[0007]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, the syringe for storing the backlash and the thermal conductivity by which the backlash stored in the syringe is pushed out by the plunger. A flexible plastic nozzle is detachably attached to the tip of the syringe body of 20 W / m · K or less, and the specific heat is 0 at the inner surface of the syringe body tip and at the position where it comes into contact with the nozzle. .4 J / kg · K or more of heat storage metal is fixed, and the nozzle is provided with a reversible temperature indicating material indicating that the temperature has become higher by a predetermined temperature than the softening temperature of the backlash. The inventors of the present invention have determined what should be done and completed the present invention.

When the syringe body is made of glass, polyethylene, or polypropylene, which is transparent or translucent, the backlash stored in the backpacking storage syringe is not deteriorated and its amount can be visually checked. They have also found that if the metal for heat storage is stainless steel or titanium, it is preferable because it has high heat storage properties, is excellent in durability, and does not deteriorate the backlash.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a syringe for accommodating backlash according to the present invention.
FIG. 1 is a perspective view showing an embodiment of a rattle-perch storage syringe according to the present invention in which the syringe body is made of a transparent material, and FIG. 2 is a sectional view taken along the center line of FIG.

In the drawings, reference numeral 1 denotes a syringe main body made of a material having a thermal conductivity of 20 W / m · K or less. Heat storage metal 1a of 4 J / kg · K or more is fixed. The syringe body 1 is made of transparent or translucent glass (thermal conductivity: 0.74 to 1.39 W / mK) or transparent or translucent polyethylene (thermal conductivity: 3.4 to 5.3 W /
m · K) or a transparent or translucent polypropylene (thermal conductivity: 0.9 W / m · K), without altering the backlash 5 stored therein and reducing the amount thereof. It is preferable because it can be visually observed. When the heat storage metal 1a is made of stainless steel (specific heat: 0.46 J / kg · K) or titanium (specific heat: 0.528 J / kg · K), the heat storage property is high and the durability is excellent. This is preferable because there is no change in the quality of the aperture.

The syringe body 1 has a heat conductivity of 20 W /
The reason that the material must be formed of a material of m · K or less is that when the thermal conductivity is greater than 20 W / m · K, the tip of the syringe body 1 is immersed in hot water and housed in the syringe body 1. When the distal end of the rattle aperture 5 is heated to a softened state, the entire syringe body 1 rises to a temperature close to the temperature, and the rattle aperture 5 other than the distal end inside the syringe body 1 softens and is not used. This is because not only may the part up to 5 be deteriorated, but also it may be difficult to operate the syringe body 1 by hand. The specific heat of the heat storage metal 1a is 0.4 J /
The reason why the material must be made of a material of kg · K or more is that if the specific heat is smaller than 0.4 J / kg · K, the tip of the syringe body 1 is immersed in hot water and housed in the syringe body 1. When the tip of the backlash 5 is heated to a softened state, the temperature other than the tip of the syringe body 1 is much lower than the softening point of the backlash 5 due to the thermal conductivity. This is because a heat storage amount sufficient to heat the backlash 5 extruded from the portion above the softening point cannot be secured for a long time.

Reference numeral 2 denotes a plunger for pushing out the backlash 5 housed in the syringe body 1. Reference numeral 3 denotes a syringe body 1 which can be replaced for each patient in order to prevent nosocomial infections such as AIDS and hepatitis B. Is a plastic nozzle that can be detachably attached to the tip of the patient and has flexibility so that it can follow the curvature of the patient's root canal when inserted into a curved root canal. It is preferable that the backlash 5 is made of a polyolefin resin such as polyethylene or polypropylene that does not deteriorate the play. Reference numeral 4 denotes a softening temperature of the backlash 5 (normally 40 to
90 ° C.) is a reversible temperature indicating material indicating that the temperature has increased by a predetermined temperature.

In the syringe for storing a backlash having the above-mentioned structure according to the present invention, the backlash 5 is inserted into the syringe body 1 having the nozzle 3 mounted at the tip, and the backlash 5 stored by the plunger 2 is inserted. The nozzle 3 and the tip of the syringe body 1 are immersed directly in hot water such as an agar softening bath or a water heater installed in a dental clinic with the backlash 5 reaching the tip of the syringe body 1 by pushing Heat for a short time and play 5
Is heated to a temperature higher by a predetermined temperature than the temperature at which the tip of the metal is softened. This heating does not require a heating time of 10 minutes as in a method of heating through air having poor heat conductivity as in a conventional special and expensive heating device, so that the additional backlash 5 is immediately softened and extruded. Replenishment into the root canal becomes possible and clinical rework can be prevented.

When the nozzle 3 and the tip of the syringe main body 1 are heated to a predetermined temperature higher than the softening temperature of the backlash 5, the predetermined temperature becomes lower than the softening temperature of the backlash 5 provided in the nozzle 3. The reversible temperature indicator 4 indicates that the heating has been properly performed, so that the nozzle 3 is directly inserted into the root canal of the patient and the syringe body 1 is moved by the plunger 2.
When the rear part of the backlash 5 is pressed, the soft backlash 5 in the tip of the syringe body 1 is directly filled into the patient's root canal via the nozzle 3 and then to the tip inside the syringe body 1. The reached rattle aperture 5 is brought into contact with the heat storage metal 1a fixed at the inner surface of the distal end inside the syringe body 1 and at the position where it comes into contact with the nozzle 3, and is softened and can be filled.

Since the temperature indicator 4 is reversible, 1
In addition to the disadvantage that the temperature indicating material 4 loses its function and is uneconomical due to repeated heating, the temperature indicating the backlash 5 in the nozzle 3 becomes lower than the softening temperature and is not suitable for use. Since the occurrence of a phenomenon that cannot be visually confirmed due to the discoloration can be prevented, the use of the reversible temperature indicator 4 allows the backlash 5 to be pushed out of the nozzle 3 in a stable state.

Since the nozzle 3 is made of flexible plastic and can be directly inserted into the root canal of the patient, the temperature of the oral cavity is higher than the outside air temperature as compared with the conventional indirect method. There is also an advantage that the temperature of 3 becomes difficult to decrease and it is easy to maintain the temperature until the injection and filling into the root canal of the patient is completed, and the operation margin of the direct filling operation can be extended.

Further, since the heat storage metal 1a having a large specific heat and excellent heat storage property is fixed to the inner surface of the tip of the syringe body 1 having poor heat conduction and in contact with the nozzle 3,
Only the backlash 5 pushed out from the tip of the syringe body 1 by the plunger 2 is heated to a temperature higher than the softening temperature, and this effect is maintained for a long time.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A stainless steel (SUS304) cylindrical heat storage metal having an outer diameter of 5.5 mm, an inner diameter of 4.0 mm and a length of 10 mm is fixed to the inner surface of the tip at a position where it contacts the nozzle. A 2.5 mm long, 4.0 mm inside diameter, 75 mm long polyethylene syringe body with a total length of 25 mm at the tip and a tip outer diameter of 0.5 mm.
A reversible temperature indicator with a discoloration temperature of 60 ± 2 ° C on a surface made of flexible polyethylene with a diameter of 65 mm, an inner diameter of 0.45 mm, a length of 19 mm from the tip, an outer diameter of 2 mm, and an inner diameter of 1.5 mm. A syringe for storing a rattle aperture was manufactured by fitting a tapered nozzle to which an industrial company, trade name: Thermo Tape TR-60) was attached. In this syringe for storing backlash, a backlash (softening temperature 5
5 ° C.), and press so that the backlash filled with a plunger made of polypropylene is positioned within the tip of the syringe body, and then immerse only the syringe tip and nozzle in hot water of about 80 ° C. for about 30 seconds. Then take out
When injected into the root canal model manufactured by Nisshin Dental Inc., for about 30 seconds during which the temperature indicator is kept black, it is possible to continuously extrude and use a rattle aperture having a temperature and a softened state suitable for the intended use, The rattle could be filled into the root canal.

[0019]

[Comparative Example] A total length of 25 mm at the tip of a polyethylene syringe body having an outer diameter of 6.5 mm, an inner diameter of 4.0 mm, and a length of 75 mm, a tip outer diameter of 0.65 mm, an inner diameter of 0.45 mm, and a length of 19 mm from the tip.
A rattle-perch storage syringe was fitted with a flexible polyethylene tapered nozzle having an outer diameter of 2 mm and an inner diameter of 1.5 mm. The syringe for storing the backlash is filled with a backlash (softening temperature: 55 ° C., manufactured by GC Corporation), and the backlash filled with a plunger made of polypropylene is pressed so as to be positioned within the distal end of the syringe body. Only the tip and the nozzle were immersed in hot water of about 80 ° C for about 1 minute, taken out, and injected into a root canal model manufactured by Nissin Dental.
It was confirmed by the transparent model that the pulp could not be extruded when the pulp was partially filled.

[0020]

As described in detail above, the rattle-perch storage syringe according to the present invention has various effects as listed below and is of great value contributing to the dental field. is there.

The syringe body in which the backlash stored in the inside of the syringe is pushed out from the nozzle by the plunger is used because the temperature of only the heated portion at the tip thereof rises and the temperature of the unheated portion hardly rises. The time required for the softening of the backlash is short, and at the same time, since the nozzle is directly inserted into the root canal, a sufficient operation margin is possible until the backlash solidifies.

Since the heat storage metal having a large specific heat is fixed to the inner surface of the tip of the syringe body and in contact with the nozzle, even if only the tip of the syringe body and the nozzle are heated, the backlash is pushed out of the syringe body. Can be maintained above the curing temperature for an extended period of time, so that the dentist can concentrate on the treatment with confidence.

By using hot water such as an agar softener or a water heater installed in a dental clinic, only the tip and nozzle of the syringe body can be heated to a suitable temperature for a short time by heating only a short time. Not only is it easy to take up space, but also the power cord does not interfere with medical treatment as in the past. If the curing of the parter takes a long time of about 10 minutes to reheat, there is a problem that the filling operation needs to be re-executed. This eliminates the need for a special and expensive heater, making treatment easy and significantly reducing clinical costs. Can be measured.

By heating only the tip and the nozzle of the syringe body, only an appropriate amount of the backgutter is heated to a temperature higher than the softening temperature by a predetermined temperature, and the backgutter in the syringe body other than the unheated tip portion is heated to the softening temperature. There is no danger that the rattles in other parts will deteriorate. As a result, it is possible to prevent the occurrence of a phenomenon in which the root canal is heated to an excessively high temperature which causes a great damage to the quality of the rattle aperture, which must maintain the quality for several decades after filling.

The nozzle is provided with a reversible temperature-indicating material indicating that the temperature is higher by a predetermined temperature than the softening temperature of the stored backgutter, so that the backgutter used by being pushed out is maintained at a suitable temperature. Since it is very easy to know whether or not the operation has been performed, it is possible to eliminate clinical anxiety that the backlash hardens during the operation.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a syringe for accommodating a backlash pertaining to the present invention in which a syringe body is made of a transparent material.

FIG. 2 is a sectional view taken along the center line of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Syringe main body 1a Metal for heat storage 2 Plunger 3 Nozzle 4 Temperature indicator 5 Gutter aperture

Claims (3)

[Claims] The thermal conductivity of extruding the backlash (5) housed in the plunger (2) by the plunger (2) is 2
A flexible plastic nozzle (3) is detachably attached to the tip of the syringe body (1) of 0 W / m · K or less, and the inner face of the tip of the syringe body (1) is Specific heat is 0.4 J / kg · K at the position where it comes into contact with nozzle (3)
The above metal for heat storage (1a) is fixed, and the nozzle (3)
A reversible temperature indicating material (4) indicating that the temperature has become higher by a predetermined temperature than the softening temperature of the play (5). 2. The syringe body (1) is transparent or translucent.
The syringe according to claim 1, which is made of glass, polyethylene, or polypropylene. 3. The syringe according to claim 1, wherein the metal for heat storage is one of stainless steel and titanium.