JP2013094549A - Method for polymerization control of room temperature curing resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To disclose a method for polymerization control of a room temperature curing resin, which can obtain comparable operability and polymerization velocity to a light-polymerized resin.SOLUTION: The method for polymerization control of a room temperature curing resin is characterized by putting resin clay mixed with a liquid agent and a power agent in a state of a sticky rice cake at the latest into a freezer, and keeping the resin clay under a cooling condition for at least two hours. The resin clay is inhibited from being polymerized by cooling so as to be in the form of sticky rice cake or clay. The resin clay is preliminarily filled into a syringe, or is formed in the shape of a sheet, thereby allowing the resin clay to be treated according to the usage experience of the light-polymerized resin. Further, the resin clay is preferably heated and polymerized at a temperature equal to or higher than ambient temperature after the resin clay taken out of the freezer is applied to a target artificial tooth.

Description

  The present invention mainly relates to a polymerization control method for giving an injection type room temperature polymerization resin the same operability and polymerization rate as a photopolymerization resin.

  The inventors of the present application have proposed a method (freezing processing method) for producing a denture using a frozen dental resin, and have already completed a manufacturing invention of an artificial tooth based on a photopolymerized resin. (Patent Document 1).

  That is, in the manufacturing method of Patent Document 1, the photopolymerization resin is embedded in an elastic impression mold, cooled in a freezer, the cooled and solidified resin is released from the elastic impression mold, and then cured by light irradiation. Use means. As a result, an artificial tooth having a complicated shape can be precisely manufactured even with a relatively small technical capacity. In addition, since a photopolymerization resin is used, many usefulnesses are obtained such that there are many kinds of differences in color, viscosity, and hardness after polymerization, the polymerization rate is high, and the shape can be maintained by cooling and solidification.

  As described above, the photopolymerization resin is also suitably used in the inventor's proposed freezing processing method. In particular, the photopolymerization resin has an appropriate consistency, and is preliminarily operated in a sheet form, a sticky form, a flow paste form, and the like depending on cases. Since it is provided in an easy-to-use state, it is possible to repair a missing tooth part or a part of the surface directly in the oral cavity. This is suitable for the patient, and the shape is determined, and the polymerization rate is fast, so the completed denture can be viewed immediately on the patient, making it possible to produce dentures that reflect the suitability and intention of the patient ( Hereafter, it will be referred to as an immediate exhibition production method).

Japanese Patent No. 4163936

  However, photopolymerization resins are relatively expensive among dental resins. In addition, when the object is large or thick, it is difficult to irradiate the entire object with light uniformly, and therefore, partial polymerization is required to repeat partial photopolymerization several times. Time loss occurs.

  In contrast, a room temperature polymerization resin can be obtained at a relatively low cost. The polymerization curing time is 15 to 20 minutes at room temperature (40 to 50 ° C.), but it is known that it can be shortened to about 3 minutes by heating with hot water or the like, and the polymerization rate should be equivalent to that of the photopolymerization resin. Is also possible. Furthermore, the room temperature polymerization resin is slightly inferior in strength and durability after polymerization curing, but it can be used temporarily for temporary dentures and rehabilitation because it can produce dentures with good compatibility by correcting polymerization shrinkage. It is particularly suitable as a denture material.

  However, since a normal temperature polymerization resin is mixed with a powder and a liquid just before use and polymerization is started in about 2 minutes, the operation time is shorter compared to other heat polymerization resins and heat shock type dental resins. In addition, the room temperature polymerization resin has a problem that a bad odor is generated when mixed with a powder due to a volatile component contained in the liquid.

  In the first place, room temperature polymerization resin is used for the injection method.In the past, the original form was first made with wax, then mold was made with gypsum or silicone, and room temperature polymerization resin was injected into the lost wax mold. The process of substituting the original wax with a resin and then polymerizing under pressure was followed, and the time from mold production to resin polymerization required 1 hour.

  On the other hand, in the instant exhibition production method using the above-described photopolymerization resin, a necessary part of the wax original form is directly replaced with the resin, and the resin at that part is molded in-situ. If you get used to it, you can shorten it to less than that, and as a result, you can proceed with denture production in the presence of the patient.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to perform an operation equivalent to that of a photopolymerization resin on a room temperature polymerization resin in order to realize a method for manufacturing a denture using an injection type room temperature polymerization resin. It is to disclose a method capable of imparting properties and polymerization rate.

  In order to achieve the above-described object, the present invention uses a means in which a resin mud mixed with a liquid agent and a powder agent is put into a freezer at the latest in a mochi state and kept in a cooling state for a predetermined time. According to this means, the resin mud is prevented from being polymerized and cured by maintaining the cooling in the freezer, and can be stored in a mud or sticky state when the freezer is charged.

  The room temperature polymerization resin is in the form of a mud immediately after mixing the powder and the liquid, and if it is left at room temperature as it is, it will harden into a sticky or rubbery shape over time. In response, put it into the freezer in either a mud or mochi state. However, it is put into the freezer at the latest while it is sticky. This is because, even if the rubber-cured material is put into a freezer, a viscosity with good operability cannot be obtained. The standard cooling condition is to maintain a cooling state for one hour or more in a freezer or freezer of a general household refrigerator. If it is this condition, when it takes out from a freezer, it will become muddy or sticky, and operativity is good. On the other hand, if the cooling time is short, the polymerization curing stopping action is not sufficient, and the operation time after taking out from the freezer cannot be secured sufficiently. Although the upper limit of the cooling time is not particularly defined, it is considered that the properties of the resin itself may be deteriorated if left for a long time. Therefore, several hours are appropriate, and it is realistic to set it to 4 hours. That is, if the cooling time is set to 4 hours or less, the examination is conducted in the morning, and the treatment schedule from the afternoon is also met.

  In the present invention, the resin mud is filled in a syringe and sealed before being put into the freezer. Alternatively, it is formed into a sheet shape, laminated with a film and sealed. This is because, by imitating the product form of the photopolymerization resin in this way, it is possible to create dentures such as an immediate exhibition production method utilizing the experience of using the photopolymerization resin. In addition, by sealing, the volatilization of the liquid agent is suppressed and the resin mud is not easily altered.

  Resin mud taken out of the freezer does not polymerize immediately even at room temperature, and remains mud or sticky longer than room temperature polymerization resin that is not cooled. As described above, according to the present invention, the operation time is ensured for a long time, so that the operation of directly replacing the wax original form with the resin becomes possible. Furthermore, in the present invention, since the means of heat polymerization in an atmosphere of room temperature or higher is used, the room temperature polymerization resin after cooling processing can be polymerized and cured in about 1 to 3 minutes, similar to the photopolymerization resin. . At this time, it is convenient for the heating means to immerse the target denture after application of the resin mud in hot water.

  The target denture can be selected from the range of application of the room temperature polymerization resin. As a specific application method, based on a wax original form (wax denture) that has been confirmed in the oral cavity in advance, the necessary part is directly resinated. It is preferable to substitute (form) the shape. This is because the working time is greatly shortened as compared with the injection method and the filling method, and an immediate viewing is possible for the patient. In addition, according to this direct molding method, there is no inconvenience that the inner surface cavity of the wax original is filled to make the inner surface form uncontrollable or difficult to release due to close contact with the wax.

  The polymerization control method of the room temperature polymerization resin of the present invention can be made into a sticky or mud sheet or syringe injection type by cooling the powder and liquid resin mud of the room temperature polymerization resin, and is equivalent to the photopolymerization resin. A dental resin having operability can be obtained at a lower cost than a photopolymerization resin. Moreover, if this resin is polymerized by heating to produce a denture base, artificial teeth, or the like, the polymerization time can be significantly shortened compared to a normal room temperature polymerization resin.

Photograph showing Example 1 of the present invention Photograph showing Example 2 of the present invention Photograph showing Example 3 of the present invention A photograph showing a denture base to which the resin of Example 3 was applied Photograph showing Example 4 of the present invention (confirmation of original shape using lip model) A photograph showing Example 4 of the present invention (molding of a dentition with the resin of Example 2) Photograph showing Example 4 of the present invention (Gum formation with resin of Example 1) Photograph showing polymerization of Example 4 of the present invention (polymerization by heating and pressing) A photograph showing Example 4 of the present invention (confirmation of an artificial tooth using a lip model) Photograph showing Example 4 of the present invention (artificial tooth release)

  The polymerization control method of the room temperature polymerization resin of the present invention is mainly a pouring type room temperature polymerization resin, in which the resin mud mixed with the liquid agent and the powder is put into a freezer at the latest in a mochi state for a predetermined time (1 to 4 hours). , Preferably 2 to 3 hours), and the cooling state is maintained as it is, and the resulting form is a sheet type, a mochi shape filled in a syringe, and a mud shape (flow) filled in a syringe. is there. Examples of these three types will be described below.

  A denture base acrylic resin (Parapress Vario manufactured by Heraeus Kulzer) is used as a room-temperature polymerization resin, and the powder and liquid are mixed in the amount according to the manufacturer's instructions. The syringe type syringe was filled and sealed, and in that state, it was cooled in a freezer for 2 hours. According to the dental resin obtained by this method, the properties of a mud paste were shown, and it could be injected into a mold in the same way as a normal injection resin (FIG. 1), and then easily pressed with an instrument. .

  Resin mud was prepared in the same manner as in Example 1, and cooled in a freezer for 2 hours in a state where the nozzle was filled in a straight type syringe having the same diameter while being stretchy. According to the dental resin obtained by this method, the properties of the sticky paste can be shown, the resin extruded from the tip of the syringe can be cut with an instrument, and it can be easily press-formed into a mold as in Example 1. (Fig. 2).

  Resin mud of the same room temperature polymerization resin as in Examples 1 and 2 was molded into a sheet between mochi, laminated on both sides with a film, and cooled in a freezer for 2 hours. The sheet-shaped dental resin obtained by this method is first peeled off the film on one side and pasted on a jaw model (original shape) prepared in advance with wax or the like, and then peeled off on the other side of the film. When applied, it stretched firmly and the excess part of the edge could be cut with scissors (FIG. 3).

  Thus, according to Examples 1 to 3, it was confirmed that the dental resin of the present invention had the same operability as the photopolymerization resin.

  Moreover, when the denture base obtained in Example 3 was immersed in hot water and pressurized to about 2 atm with a pressurizer, polymerization was completed in 3 minutes in this case. And when the denture base after superposition | polymerization was confirmed visually, there was no heat contraction of resin and the favorable adaptation was shown (FIG. 4). In addition, as in this case, it is possible to present the resin (color, etc.) to be used to the patient before heat polymerization by means of molding the resin directly on the jaw model, and easily from the jaw model after polymerization. It was also possible to release the mold.

  Furthermore, since the artificial tooth was manufactured using the syringe-filled resin obtained in Examples 1 and 2, the example will be described with reference to the drawings.

  First, the original shape of the affected area was manufactured according to the conventional method, and confirmed with a lip model (FIG. 5), and then the paste-like resin of Example 2 was built up on the affected area (non-uniformly arranged dentition) in this original shape. Applying (molding) (Fig. 6), and further building up the mud resin of Example 1 on the original gingival part (Fig. 7), pressurizing (2 atm) in a state immersed in warm water. And polymerized (FIG. 8). The time required to reach FIGS. 6 to 8 was about 10 minutes. Then, when the artificial teeth that had been polymerized were mounted on the lip model together with the original shape, a product satisfying both oral function and appearance was obtained (FIG. 9). Furthermore, the artificial tooth that had been polymerized could be beautifully released from its original shape (FIG. 10).

  In the above three types, the consistency of the resin mud filled in the syringe varies depending on the cooling time, but basically depends on the mixing time of the powder and liquid. That is, if the mixing time is short, it becomes a mud with low viscosity, and it can be controlled to be sticky by increasing the mixing time. This also applies to the sheet type, and it can be adjusted to a soft sheet or a hard sheet by changing the mixing time. Which of these should be adopted may be arbitrarily selected according to the case. The polymerization time under heat and pressure is generally within 3 minutes, but depending on the size, the polymerization may be completed within 1 minute.

Claims (7)

A method for controlling polymerization of a room temperature polymerization resin, characterized in that a resin mud mixed with a liquid and a powder is put into a freezer at the latest in a mochi state and kept in a cooling state for a predetermined time. The method for controlling polymerization of a room temperature polymerization resin according to claim 1, wherein the resin mud is filled in a syringe in advance and the sealed one is put into a freezer. The method for controlling polymerization of a room temperature polymerization resin according to claim 1, wherein the resin mud is formed into a sheet shape and sealed with a film, and then charged into a freezer. 4. The method for controlling polymerization of a room temperature polymerization resin according to claim 1, wherein the cooled resin taken out of the freezer is applied to the target denture, and then heat polymerization is performed in a temperature atmosphere of room temperature or higher. The method for controlling polymerization of a room temperature polymerization resin according to claim 4, wherein a necessary portion of the original shape previously molded with wax in the oral cavity is directly substituted with a cooled resin to give a form, and then heat polymerization is performed. The method for controlling polymerization of a room temperature polymerization resin according to claim 4 or 5, wherein the heat polymerization is performed in a state of being immersed in warm water. The method for controlling polymerization of a room temperature polymerization resin according to any one of claims 1 to 6, wherein the cooling time of the resin mud is 1 hour or more.