Evaluation method for flowable composite resins

Abstract

This invention provides an evaluation method using an evaluation index that allows for prior assessment of whether the operability of a combination of a flowable composite resin and an ultra-fine tip, which is intended for use in restorative treatment using flowable composite resin, is suitable for performing the desired procedure. [Solution] After attaching the tip to be evaluated to the flowable composite resin to be evaluated, the plunger is pressed at a constant speed within the range of 0.2 to 2.0 (mm / min) at a predetermined temperature, and the maximum pressing force: P(N) changes over time. max Find (N), and P max The usability during clinical use is evaluated based on the value of [this value].

Description

[Technical Field]

[0001] This invention relates to a method for evaluating flowable composite resins. More specifically, it relates to a method for evaluating flowable composite resins using parameters that correlate with actual clinical usability, which serve as indicators for practitioners who intend to perform precise dental restorations by attaching an ultrafine tip to "flowable composite resin," a dental filling material filled in a syringe container, to select a combination of flowable composite resin and ultrafine tip that has suitable operability for the planned restoration form. [Background technology]

[0002] A syringe container with a plunger and nozzle is a useful instrument for dispensing and using an appropriate amount of liquid or paste (a soft, viscous substance) contained inside. For example, in dental medicine, it is used as a syringe container for composite resin, a dental filling material used in caries treatment, etc. In particular, because it allows for the direct and appropriate amount of composite resin paste to be filled into the affected area for tooth restoration, "flowable composite resin" (sometimes called injectable composite resin, meaning it can be directly dispensed) which has become increasingly popular in recent years is filled into a syringe container.

[0003] In such flowable composite resins, it is common practice to connect a tip with a tubular discharge port (hereinafter also simply referred to as "tip") to the nozzle at one end of the storage syringe container for hygienic reasons and to facilitate the collection of an appropriate amount of paste (Patent Document 1). Furthermore, in commercially available flowable composite resin products, the paste properties such as the fluidity and viscosity of the composite resin being filled vary depending on the brand, and multiple grades of fluidity variations are often available within the same brand (Non-Patent Document 1).

[0004] Tips that have a metal tubular nozzle attached during use are also called needle tips, and the inner diameter of the tubular nozzle of the needle tip is usually 0.3 to 0.9 mm (Patent Document 2). Needle tip types are often indicated by gauge (G) according to the size of the inner / outer diameter of the needle tube. The larger the gauge number, the smaller the outer and inner diameters. Needle tips commonly used in restorative treatment with flowable composite resin are often 18G (inner diameter approximately 0.9 mm) to 20G (inner diameter approximately 0.7 mm).

[0005] In recent years, a precise dental restoration method has been proposed that uses ultrafine needle tips with extremely small needle tube diameters, allowing for the extraction of smaller amounts of material (Non-Patent Literature 2). The needle tube size of such ultrafine needle tips is said to be equivalent to 25G to 30G, which is considerably smaller than commonly used needle tips. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2002-204803 [Patent Document 2] Re-tabled publication 2014-083842 [Non-patent literature]

[0007] [Non-Patent Document 1] Tokuyama Dental Co., Ltd., "Estelite Universal Flow Composite Resin for Dental Fillings (Light-Curing Type)" - Page 1 of the relevant section, [online], [Searched September 6, 2024], Internet<URL:https: / / www.tokuyama-dental.co.jp / products / items / estelite_universal_flow_panphlet.pdf> [Non-Patent Document 2] Doctor Japan Co., Ltd., Morimura Co., Ltd., “Dental Injection Device, Single Use, CR Tip 30G”, Related section, page 2, [online], [Searched August 8, 2024], Internet<URL:https: / / www.morimura-jpn.co.jp / wp-content / uploads / 2023 / 09 / fd9b5112c50f1c5dbe977c2509da3e27.pdf> [Overview of the project] [Problems that the invention aims to solve]

[0008] As mentioned above, the size of the ultra-fine needle tip tube is considerably smaller than that of commonly used needle tips. Therefore, when using such an ultra-fine needle tip, it is expected that the operability required for paste collection, particularly the extrusion and discharge properties, will be affected, and the user experience will be completely different from that of using conventional needle tips. For example, when using an ultra-fine needle tip, it may be impossible to discharge any paste at all. In addition, such ultra-fine needle tips are available from various suppliers in different grades, and even for the same gauge equivalent, the discharge properties may differ depending on the brand due to differences in the inner diameter of the tube and the uniformity of the inside of the tube.

[0009] Regarding the flowable composite resin to be filled in the flowable composite resin, it is generally considered that a flowable composite resin with lower viscosity and higher fluidity is more excellent in extrudability. Therefore, when using an ultrafine needle tip, selecting a flowable composite resin advertised as a low-viscosity type or a high-flow type is one approach. However, if a product that is too easy to extrude is selected, the amount of content discharged at one time will be too large, which may adversely affect precise restoration work. In addition, if the viscosity of the paste is too low, the paste will sag immediately after being discharged, making it difficult to shape the paste into a desired form to reproduce the morphology of a tooth. Accordingly, dental healthcare workers need to select a flowable composite resin having an appropriate paste viscosity, and in the selection of composite resins, it is necessary to consider the effects of various physical properties such as mechanical and aesthetic properties in addition to the paste viscosity.

[0010] As described above, dental healthcare workers need to select the optimal combination from flowable composite resins of various fluidities and various ultrafine needle tips when performing intended treatments, but it has been difficult to determine what combination should be used for restoration when performing precision filling restoration treatments.

[0011] The present invention discovers a physical property that can serve as an evaluation index and a measurement method therefor, which can evaluate in advance whether the operability when a combination of a flowable composite resin and an ultrafine tip that is intended for use is adopted is suitable for performing the intended operation when performing restoration treatment using the flowable composite resin, and aims to provide a method for evaluating the operability of a flowable composite resin based on the physical property value, as well as a method for providing users with the evaluation results, that is, information on the operability of various flowable composite resin products. [Means for Solving the Problems]

[0012] The present invention solves the above problems, and a first aspect of the present invention relates to a flowable composite resin that is used by accommodating a paste made of a flowable composite resin in a syringe-type container having an outer cylinder with a tip mounting port at the cylinder tip and a pusher, mounting a tip having a tubular discharge port on the tip mounting port, then pressing the pusher to discharge the paste from the tip end of the tip. This is an evaluation method for a flowable composite resin that evaluates the operability when a tip having a discharge port tip with a specific inner diameter in the range of 0.10 to 0.28 mm (hereinafter sometimes referred to as "ultra-fine tip") is mounted and used as the tip, wherein after the tip to be evaluated is mounted on the flowable composite resin to be evaluated, the maximum pressing force in the temporal change of the pressing force: P(N) when the pusher is pushed in at a constant speed within the range of 0.2 to 2.0 (mm / min) at a predetermined temperature: P max (N) is determined, and the operability during clinical use is evaluated based on the value of the P max , which is the above evaluation method.

[0013] In the evaluation method of the above aspect (hereinafter also referred to as "the evaluation method of the present invention"), the pusher is pushed in at a speed of 1 mm / min at a specific temperature selected from the range of 20°C to 37°C, and the maximum pressing force in the temporal change of the pressing force: P(N) for 10 seconds after the paste starts to be discharged: P max Based on the value of, it is preferable to evaluate that the resin is clinically usable when 1(N)≦P max ≦300(N).

[0014] Further, in the above preferred embodiment, when 1(N)≦P max <50(N), it is evaluated that there is a tendency of excessive discharge during clinical use, and when 50(N)≦P max ≦100(N), it is evaluated that the resin can be used with good operability in clinical practice, and when 100(N)<P max ≦300(N), it is further preferable to evaluate that there is a tendency of high extrusion resistance during clinical use.

[0015] A second embodiment of the present invention is a package containing a flowable composite resin that has been evaluated by the preferred evaluation method of the present invention, with at least one tip having an outlet tip having a specific inner diameter in the range of 0.10 to 0.28 mm attached, wherein the package may contain an instruction manual for the flowable composite resin, and at least one selected from the group consisting of the outer surface of the syringe-type container of the flowable composite resin, the outer surface of the package, and the instruction manual (if one is contained therein) displays the following: (1) information regarding the inner diameter of the tip of the tip to be evaluated, (2) the temperature when the maximum pressing force was determined with the tip attached, and (3) the evaluation results regarding the determined maximum pressing force and / or (4) the operability when the tip is attached.

[0016] A third embodiment of the present invention is a method for providing information on the operability of a flowable composite resin product, wherein a paste made of flowable composite resin is contained in a syringe-type container having an outer cylinder with a tip attachment port at the end and a plunger, and the paste is dispensed from the tip of the tip by pressing a tip having a tubular discharge port into the tip attachment port with the plunger. The aforementioned client-server system is A client terminal operated by the client who will receive the information, According to the evaluation method of the present invention in a more preferred embodiment described above, for various flowable composite resin products, the maximum pressing force: P is applied to various tip products having a specific inner diameter in the range of 0.10 to 0.28 mm, at at least one measurement temperature selected from the range of 20°C to 37°C. maxperforming the determination of (N) and the evaluation based thereon, and having a database containing data associating these results for each combination of each flowable composite resin product and each tip product, an information provider's server system, , a step in which the client uses a client terminal to input information specifying the flowable composite resin product and tip product for which information provision is desired, and transmits the input information to the information provider's server system via the Internet, in the server system that has received the input information, corresponding to the combination of the flowable composite resin product and the tip product specified based on the information transmitted from the client terminal from the database, (1) the measurement temperature, and (2) the maximum pressing force: P max (N) and / or (3) the evaluation result based thereon, extracting and transmitting the same to the client terminal via the Internet, a method for providing information on the operability of a flowable composite resin (hereinafter also referred to as "the information providing method of the present invention").

Effects of the Invention

[0017] According to the evaluation method of the present invention, it is possible to evaluate in advance whether a combination of a flowable composite resin and an ultra-fine tip, which is intended to be used in restorative treatment using a dental restorative material, is suitable for performing a target operation. In addition, by using the information providing method of the present invention, a user can select a combination suitable for the purpose of use (specific aspect of filling treatment) from a very large number of combinations of flowable composite resin products and ultra-fine tip products. As described above, according to the present invention, in precision filling restoration using an ultra-fine tip, treatment can be efficiently performed with an appropriate combination of a flowable composite resin product and a tip, omitting trial use and the like.

Modes for Carrying Out the Invention

[0018] 1. Outline of the Present Invention The inventors investigated the operability of various combinations of ultrafine needle tip products and flowable composite resin products based on available information. Specifically, they attempted to determine the operability, such as extrusion, dispensing, and precision handling, necessary for performing the desired restorative treatment. However, it was extremely difficult to select an appropriate combination based on publicly available information (for example, paste viscosity and extrusion strength when a tip of a common gauge size is attached).

[0019] The inventors believed that establishing an unprecedented evaluation method was necessary to solve this problem. They investigated the operability of various combinations of available flowable composite resin products and ultrafine needle tip products. In the process, they noticed that combinations that provided a similar level of operability exhibited similar resistance when the composite resin was extruded relatively slowly. Furthermore, they investigated the relationship between the maximum pressure when the plunger was pushed in at a constant temperature and a relatively slow, constant speed and found a correlation between the two and actual operability (in clinical settings).

[0020] This invention was made based on the discovery that the above-mentioned maximum pressure can be used as an indicator of operability, and furthermore, if information can be obtained on the above-mentioned maximum pressure when ultrafine needle tips with different inner diameters (gauges) are attached to various types of flowable composite resin products, then based on that information, the user will be able to select a combination of flowable composite resin product and ultrafine needle tip that is suitable for their intended use (specific form of filling treatment). The evaluation method of the present invention will be described in detail below.

[0021] 2. Regarding the flowable composite resin and tip to be evaluated by the evaluation method of the present invention As stated above, in this specification, "flowable composite resin" means a flowable composite resin filled in a syringe container, and more specifically, a syringe container having an outer cylinder and a plunger containing a paste made of flowable composite resin, and using a device in which a tip having a tubular discharge port is attached to the tip of the outer cylinder and then pressed with the plunger to discharge the paste from the tip of the tip.

[0022] The paste to be filled can be any flowable composite resin paste intended to be directly dispensed from a nozzle-shaped discharge port. The optimal viscosity and fluidity of the flowable composite resin paste cannot be specified in general, as they vary depending on the operator's purpose and the type of tip used, but preferred ranges include a viscosity of 10 to 1500 poise, a plastic flow distance of 1 mm to 15 mm, and a consistency of 25 to 55. The flowable composite resin paste consists of a polymerizable monomer, a polymerization catalyst, inorganic particles, and additives. The polymerizable monomer is preferably a compound having two or more radical polymerizable functional groups in one molecule, the polymerization catalyst is preferably a photopolymerization initiator, and the inorganic particles are surface-treated with a silane coupling agent. The amount of inorganic particles is preferably 50 to 80% by weight when the total amount of flowable composite resin is 100% by weight. Additives such as pigments, polymerization inhibitors, ultraviolet absorbers, and fluorescent materials can be included. Furthermore, the flowable composite resin and its paste evaluated by the evaluation method of the present invention do not necessarily need to be in the form of a commercially available product, as the evaluation is for operability. A paste-like composition with equivalent viscosity and fluidity can be used as a substitute, but it is also acceptable to use a product equivalent.

[0023] The flowable composite resin paste is contained in a syringe container having a nozzle and a plunger. The plunger has a piston structure, and pressing the plunger usually dispenses the paste from the nozzle side, which is located on the opposite side. The nozzle is connected to a tip, and the paste dispensed from the nozzle tip passes through the hollow part inside the tip and is dispensed from the tip of a tubular discharge port. In dental restorative treatment, the paste dispensed from the tip of the tubular discharge port is supplied to the affected area to be restored, but since the purpose of this invention is to evaluate operability, it is not necessary to supply it to the affected area, and evaluation can be performed using models such as waterproof paper, plastic film, or artificial teeth with simulated cavities.

[0024] The evaluation method of the present invention evaluates the operability when a specific tip (ultra-fine tip) is attached to a flowable composite resin. The attached tip (ultra-fine tip) has a specific inner diameter at the tip within the range of 0.10 to 0.28 mm, is connectable to the nozzle at the tip of the container holding the flowable composite resin, and is capable of dispensing composite resin paste from the tubular discharge port at the tip of the tip. If the inner diameter is less than 0.10 mm, the extrusion force required for dispensing becomes too large, making it difficult to dispense the paste. If it is greater than 0.28 mm, it is difficult to control the amount of paste dispensed, making precise filling difficult. Therefore, such tips are not used in precise dental restoration methods, or if they are used, it is rare, and are not included in the evaluation method of the present invention. The inner diameter at the tip of the tip is indicated if the tip is a commercially available product, or if it is not indicated, it can be measured with an optical microscope or laser microscope.

[0025] The structure and material of the ultrafine tip are not particularly limited. Examples of ultrafine tips include those in which a metal tube, such as stainless steel, is joined to a resin body (ultrafine needle tip), and those made of resin that are integrally molded. The present invention is applicable to any of these. Examples of tube shapes include straight types, bent types that are pre-bent to a predetermined angle, and bendable types that can be bent to a desired angle by the operator. In restorative treatment using flowable composite resin, bent or bendable types are easier to use in order to ensure good access of the paste to the affected area. In terms of the appearance of the tip, light-shielding materials, especially metallic or black ones, are preferred in order to protect the composite resin, which is a photocurable composition.

[0026] 3. Evaluation method of the present invention In the evaluation method of the present invention, after attaching the ultrafine tip to be evaluated to the flowable composite resin to be evaluated, the plunger is pressed at a constant speed within the range of 0.2 to 2.0 (mm / min) at a predetermined temperature, and the maximum pressing force: P(N) changes over time. max Find (N), and P max The usability during clinical use is evaluated based on the value.

[0027] As described above, the evaluation method of the present invention is P max The greatest feature of this method is that it was found that the value of P correlates with actual clinical operability, regardless of the specific form of the flowable composite resin or ultrafine tip, and this was adopted as an indicator for judging operability. max The criteria for judging usability will be discussed later.

[0028] (1)P max Regarding the measurement method P maxFor measurement, first, an ultrafine tip is attached to the tip attachment port of a syringe container of flowable composite resin by connecting it without any gaps, and the paste can be dispensed by pressing the plunger. As a connection mechanism between the tip attachment port and the ultrafine tip, a connection mechanism such as a Luer lock or screw is used so that the tip can be replaced as needed.

[0029] Furthermore, any combination of flowable composite resin and ultra-fine tip can be used to determine the operability. Typically, the combination is determined by the user, such as a medical professional, to check the operability in advance, such as the force required to press, the dispensing ability, and the precision of operation, or to select a combination of flowable composite resin and tip that provides the desired operability.

[0030] Next, a flowable composite resin with an ultrafine tip attached is set in the measuring device, and the maximum pressing force: P(N) is measured over time when the plunger is pressed at a constant speed within the range of 0.2 to 2.0 (mm / min) at a predetermined temperature. max Find (N).

[0031] Any measuring device capable of pushing a plunger at a constant speed and measuring the resulting pressure can be used without limitation. Suitable devices include force gauges, load cells / torque meters, compression testers, and universal testers, but it is preferable to use a compression tester or universal tester because they allow for precise control of the extrusion speed and extrusion time.

[0032] In the evaluation method of the present invention, the indentation speed is in the range of 0.2 to 2.0 (mm / min), which is set assuming the performance of precise filling and restoration with flowable composite resin in a clinical setting. More preferably, it should be selected from the range of 0.5 to 1.0 (mm / min). The indentation speed (crosshead speed) affects the pressing force, and generally, the faster the speed, the greater the pressing force. This means that a large pressing force is required when trying to collect a large amount of paste at once. In an evaluation method that assumes precise filling and restoration as in the present invention, it is important that the paste can be dispensed, and that the paste can be dispensed with an appropriate (not too large) extrusion force. On the other hand, if too much paste is dispensed, it can also be a problem from the standpoint of precise operation. If the indentation speed is too fast, the paste may not be able to be dispensed, the syringe container may be destroyed due to the sudden compression force, or it may be difficult to control the amount of paste dispensed. If it is too slow, too little paste will be dispensed. In either case, it is undesirable from the standpoint of reproducing the actual operation. Unless there is a particular reason, 1.0 (mm / min) may be selected.

[0033] Generally, the paste properties of flowable composite resins are temperature-dependent, with viscosity decreasing at higher temperatures. Therefore, evaluation methods are performed under constant temperature conditions. Typically, a predetermined temperature within the range of 20°C to 37°C, which is the operating temperature in clinical settings, is used. For example, if work at room temperature is anticipated, the evaluation can be performed at a constant temperature of 25°C. However, when considering applications where flowable composite resins are applied directly into the oral cavity, it is preferable to evaluate at 35-37°C, which is closer to body temperature, from the standpoint of enabling more accurate evaluation.

[0034] The pressing time (measurement time) can be set arbitrarily, but 10 seconds is appropriate unless there is a specific reason otherwise.

[0035] A typical example of the evaluation method of the present invention is as follows: The selected tip is securely connected to the nozzle of a syringe container containing a paste of a flowable composite resin, ensuring there is no looseness, and fixed in a vertical position using a holding jig or similar device. The syringe container body is fixed to a base via the jig to prevent movement during the test, and it is desirable that only the plunger is fixed so that it can move smoothly in the direction of the crosshead (the part that moves to apply the load). It is also advisable to push out a small amount of paste before the test to fill the cavity inside the tip with paste. Before the test, confirm that the ambient temperature is constant (e.g., 25°C). Set the extrusion speed (crosshead speed) to a range of 0.2 to 2.0 (mm / min) (e.g., 1 mm / min). The crosshead is brought into contact with the plunger of the syringe container, and the test (movement of the crosshead) is started. The moment the paste is first dispensed is considered 0 seconds (at which point the load value begins to gradually increase), and the test is terminated after a certain period of time (e.g., 10 seconds). The measured maximum load value is defined as the maximum pressing force: P max (N) is used. When using an ultrafine tip as in the present invention, the load value immediately after the end of the test is usually the maximum load value.

[0036] (2)P max Criteria for judging operability As mentioned above, the paste properties of the flowable composite resin are temperature-dependent, therefore the maximum pressing force measured is P max (N) is affected by the measurement conditions. However, when the measurement temperature matches or is approximately equivalent to the ambient temperature at which the flowable composite resin is used in clinical practice, the paste properties at the time of measurement and at the time of use do not change, so P maxBased on this, it is possible to evaluate the operability during use. According to the inventors' studies, if the maximum pressing force measured under the above conditions is too high, it is difficult to dispense the paste of the flowable composite resin, and in some cases, it may not be possible to dispense it at all. Furthermore, it may require excessive force on the hand, which could hinder precise repair. Conversely, if the maximum pressing force is too low, it may be difficult to control the amount of paste dispensed, which could prevent precise repair. Specifically, the range of maximum pressing force that provides operability enabling precise repair is 1(N)≦Pmax≦300(N), and at this point, it is evaluated as being clinically usable.

[0037] In the more detailed evaluation criteria of the present invention, 1(N) ≤ P max When <50(N), it is evaluated as having a tendency to over-dispense when used clinically, and 50(N) ≤ P max When the value is ≤100(N), it is evaluated as being usable with good operability in clinical settings. <P max When the force is ≤300(N), it is evaluated as having a tendency to exhibit strong extrusion resistance when used clinically.

[0038] In the evaluation method of the present invention, it is assumed that operability that allows for precise repair is obtained when 20(N)≦Pmax≦200(N), and then 20(N)≦P max When <50(N), it is evaluated as having a tendency to (slightly) over-dispense when used clinically, and 50(N) ≤ P max When the value is ≤100(N), it is evaluated as being usable with good operability in clinical settings. <P max It is preferable to adopt an evaluation criterion that, when ≤200(N), the extrusion resistance tends to be (somewhat) strong when used clinically.

[0039] 4. Regarding the packaging of the present invention Information regarding evaluation results based on the aforementioned evaluation criteria is important for dentists who intend to perform precise restorations using flowable composite resin with ultrafine tips, as it helps them determine (select) the combination of flowable composite resin and ultrafine tip to use. This is because, for the combinations of flowable composite resin and ultrafine tip being considered, the paste properties change depending on the ambient temperature in the planned usage scenario. If the measurement temperature corresponding to the ambient temperature (maximum pressing force) and the maximum pressing force or the resulting operability evaluation results are known in advance, then it is possible to select a combination that is evaluated as being usable with good operability in clinical practice.

[0040] In other words, if a commercially available flowable composite resin product is evaluated using the evaluation method of the present invention at several typical operating temperatures (e.g., 25°C and / or 35°C) with various ultrafine tips attached, and the evaluation results regarding (1) the ultrafine tip, (2) the temperature at which the ultrafine tip was attached during evaluation, and (3) the determined maximum pressing force and / or (4) the operability when the tip was attached are known, then a user who intends to perform precise restorations will be able to immediately determine whether or not the product is usable.

[0041] The packaging of the present invention has the above advantages, and is a packaging in which a flowable composite resin is contained within a packaging material, and which may further contain instructions for the flowable composite resin, characterized in that the information relating to (1), (2) and (3) and / or (4) is displayed on at least one selected from the group consisting of the outer surface of the syringe-type container of the flowable composite resin, the outer surface of the packaging material, and the instructions if the instructions are contained therein.

[0042] The packaging material in the present invention is not limited as long as it can contain a flowable composite resin inside, and can be a box, a bag, or a resin film used for wrap packaging. Furthermore, when displaying information on the outer surface of a syringe-type container or the outer surface of the packaging material, it may be printed directly or a printed sticker may be attached.

[0043] 5. Information provision method for the present invention While the packaging of the present invention has the advantages described above, if the information described above is not displayed on the flowable composite resin product that a dentist intending to use for precise restorations is considering using (i.e., it is provided in a form that does not fall under the packaging of the present invention), then ultimately, there is no choice but to try it out and check the feel. The information provision method of the present invention solves this problem, and for various combinations of flowable composite resin products and various ultrafine tip products, the maximum pressing force: P is set at at least one measurement temperature selected from the range of 20°C to 37°C. max The above problem is solved by using a server system of an information provider that has a database containing data on the results obtained from the determination of (N) and the evaluation based thereon.

[0044] In other words, in the database mentioned above, the information is associated with each combination of various flowable composite resin products and various ultrafine tip products. In the server system, once a combination of a flowable composite resin product and an ultrafine tip product is identified, the results can be immediately obtained. Furthermore, if the data includes measurements taken at multiple temperatures, the results can be narrowed down by specifying the measurement temperature.

[0045] Then, the server system of the information provider and the client terminal operated by the client, who will be the information recipient, are connected via an internet line, and information identifying the flowable composite resin product and chip product for which the client wishes to receive information is input and transmitted, and for the combination identified by the server system of the information provider that received the information, (1) the measured temperature and (2) the maximum pressing force: P max (N) and / or (3) by extracting the evaluation results based thereon and sending them to the client terminal, the client can obtain the desired information.

[0046] In the information provision method of the present invention, it is also possible to incorporate arbitrary additional information and provide additional information regarding the specified combination. For example, the total energy (N·mm) obtained from the integral value of the stress-strain curve from the start to the end of extrusion, and the paste weight value (mg / 10sec) actually extruded from the tip using this evaluation method can be provided as additional information. The larger the total energy, the greater the force required for extrusion, and the paste weight value is an indicator that quantitatively evaluates how much paste was actually supplied to the affected area (extruded amount) under specified conditions, so it can be effectively used in combination selection. For example, an extruded amount of about 0.1 to 1.0 mg / sec is appropriate for precision restoration. [Examples]

[0047] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0048] The substances and abbreviations used in the examples and comparative examples are described below. <Commercially available flowable composite resin> OF: Omnichromator Flow (registered trademark) (manufactured by Tokuyama Dental Co., Ltd.) EH: Estelite Universal Flow High Flow (registered trademark) (manufactured by Tokuyama Dental Co., Ltd.) <Commercially available chips> 30G: Morimura 30CR: 30G equivalent needle tip, inner diameter 0.24mm, outer diameter 0.28mm, bendable type (manufactured by Morimura Co., Ltd.) 27G: Cannulas 27G: 27G equivalent needle tip, inner diameter 0.25mm, outer diameter 0.41mm, bent type (manufactured by Ivoclar) 20G: Tokuyama Dispensing Tip: 20G equivalent needle tip, inner diameter 0.76mm, outer diameter 0.85mm, bent type (manufactured by Tokuyama Dental Co., Ltd.) 2. Experimental Method <Evaluation of pressing force> The tip was securely attached to the syringe container holding the paste, fixed vertically to a jig, and mounted on a universal testing machine (Shimadzu Corporation, AG-I). A small amount of paste was squeezed out to fill the cavity inside the tip. The temperature was set to 25°C, the crosshead speed to 1.0 mm / min, and the crosshead was brought into contact with the plunger of the syringe container to start the test. The moment when the load was applied to the plunger and the paste was first dispensed was defined as 0 seconds, and the load was released after 10 seconds to end the test. The maximum load value detected was defined as the maximum pressing force: P max (N)

[0049] Example 1 When evaluated using OF and 30G in combination, it was possible to extrude the material, although there was some resistance. Maximum pressing force: P max (N) was 105N.

[0050] Example 2 When EH and 30G were combined and evaluated, extrusion was possible. Maximum pressing force: P max (N) was 50N.

[0051] Example 3 When OF and 27G were combined for evaluation, extrusion was not possible. Maximum pressing force: P max (N) was unmeasurable.

[0052] Comparative Example 1 When OF and 20G were evaluated together, extrusion was extremely easy, but controlling the discharge volume was difficult. Maximum pressing force: P max (N) was 13N.

Claims

1. A method for evaluating a flowable composite resin, comprising a syringe-type container having an outer cylinder with a tip attachment port at the tip and a plunger, containing a paste made of flowable composite resin, and using a flowable composite resin by attaching a tip having a tubular discharge port to the tip attachment port and then pressing the plunger to discharge the paste from the tip, wherein the flowable composite resin is used when a tip having a discharge port tip with a specific inner diameter within the range of 0.10 to 0.28 mm is attached, the method for evaluating a flowable composite resin, The maximum pressing force P(N) is measured over time when the tip to be evaluated is attached to the flowable composite resin to be evaluated, and the plunger is pressed at a constant speed within the range of 0.2 to 2.0 (mm / min) at a predetermined temperature. ｍａｘ Find (N) and P ｍａｘ The usability during clinical use is evaluated based on the value. The evaluation method characterized by the above.

2. The plunger is pressed at a speed of 1 mm / min under a specific temperature selected from within the range of 20°C to 37°C, and the maximum pressing force: P(N) is observed as it changes over time for 10 seconds after the paste begins to be dispensed. ｍａｘ Based on the value of , 1(N) ≤ P ｍａｘ The evaluation method according to claim 1, wherein the product is evaluated as clinically usable when the value is ≤300 (N).

3. 1(N) ≤ P ｍａｘ When <50(N), it is evaluated as having a tendency to over-dispense when used clinically, and 50(N) ≤ P ｍａｘ When ≤ 100(N), it is evaluated as being usable with good operability in clinical practice, and 100(N) < P ｍａｘ The evaluation method according to claim 2, wherein when ≤ 300 (N), it is evaluated that there is a tendency for strong extrusion resistance when used clinically.

4. A package containing a flowable composite resin, which has been evaluated by the evaluation method described in claim 2, with at least one tip having an outlet tip having a specific inner diameter in the range of 0.10 to 0.28 mm, The packaging material may contain instructions for the flowable composite resin. At least one selected from the group consisting of the outer surface of the syringe-type container of the flowable composite resin, the outer surface of the packaging material, and the instruction manual in the case where the instruction manual is contained, displays: (1) information regarding the inner diameter of the tip of the tip to be evaluated, (2) the temperature when the maximum pressing force is determined with the tip attached, and (3) the evaluation results regarding the determined maximum pressing force and / or (4) the operability when the tip is attached. The packaging body characterized by the above.

5. A method for providing information on the operability of a flowable composite resin product, wherein a paste made of flowable composite resin is contained in a syringe-type container having an outer cylinder with a tip attachment port at the tip and a plunger, and the paste is dispensed from the tip by pressing a tip having a tubular discharge port into the tip attachment port with the plunger, and the product is used by attaching a tip available as a flowable composite resin product to a tip having a specific inner diameter within the range of 0.10 to 0.28 mm, the information being provided by a client-server system, The aforementioned client-server system is A client terminal operated by the client who will receive the information, According to the evaluation method described in claim 3, for various flowable composite resin products, the maximum pressing force: P is applied to various tip products having a specific inner diameter in the range of 0.10 to 0.28 mm, at at least one measurement temperature selected from the range of 20°C to 37°C. ｍａｘ The information provider's server system includes a database containing data that associates the results for each combination of each flowable composite resin product and each chip product, based on the determination of (N) and the evaluation therefrom. It has, The client uses a client terminal to input information identifying the flowable composite resin product and chip product for which it wishes to receive information, and transmits the input information to the information provider's server system via the Internet. In the server system that has received the input information, from the database, corresponding to the combination of the flowable composite resin product and the chip product specified based on the information transmitted from the client terminal, (1) the measurement temperature and (2) the maximum pressing force: P ｍａｘ (N) and / or (3) the evaluation result based thereon, and transmitting the extracted result to the client terminal via the Internet A method for providing information on the operability of a flowable composite resin having [a specific characteristic].