Magnetic devices for artificial dentures and magnetic devices for prefabricated artificial dentures

Abstract

This invention provides a denture magnetic device structure that ensures denture stability while providing superior comfort by strongly adhering the denture to the gums using magnets, without the need to implant magnetic metal in the tooth root. [Solution] A denture magnet device structure consisting of a denture base and artificial teeth with embedded magnets, which are treated to prevent rust, corrosion, oxidation, and wear, and are embedded and sealed in the denture base in the form of round, square, sheet, powder, etc., of 20 mm or less, and are attracted to the gums by magnetic force using magnetic field lines between the magnets, and a denture magnet device that is sealed and formed in a pre-existing artificial denture.

Description

Technical Field

[0001] The present invention relates to an artificial denture device using a magnet.

Background Art

[0002] When teeth are missing due to an accident or naturally, the missing part for functional recovery is solved by an artificial organ. A denture is a replacement for the lost tooth, and there are complete dentures for people without any teeth and partial dentures for people with some missing teeth. In either case, the force of biting on the mucosa of the gum at the part where the tooth has been extracted is transmitted to the artificial tooth by magnetic force, and the structure supports the left - right and up - down movements. A denture is composed of an artificial gum and artificial teeth. By closely attaching and fixing the artificial gum to the wearer's original gum, the artificial teeth are used to chew food. However, a major problem with such dentures is that there is often a slight gap between the artificial gum and the original gum. Therefore, if foreign matter gets into this gap, pain will occur when chewing something. Also, the occurrence of a gap means that the denture is not stably fixed, and it may come off or have abnormal occlusion.

[0003] A denture is a replacement for the lost tooth, and there are complete dentures for people without any teeth and partial dentures for people with some missing teeth. In either case, the structure supports the biting force on the mucosa of the gum at the part where the tooth has been extracted. Particularly, a major problem with complete dentures is that a slight gap occurs between the gum, and when foreign matter such as chewing substances gets in, it can cause pain and is one of the causes for the complete denture to come off.

[0004] To resolve the problems associated with complete dentures, using gel or sheet-type adhesives is a simple and common method, but in recent years, implant procedures and various attachments are also being chosen. Furthermore, the area where the denture makes contact, i.e., the connection point, is the alveolar bone, and its surface is covered with mucous membrane. This mucous membrane is divided into a movable part that moves with the movement of the head and a fixed part that does not move regardless of the movement. The inner surface of the denture is in contact with both of these parts simultaneously, which makes it difficult to create a well-fitting denture. Moreover, the plaster model that forms the basis of denture fabrication captures the static state of the jaw at a particular moment, and its shape changes slightly each time an impression is taken. Therefore, it is common for the finished denture not to fit a plaster model made on a different occasion. In addition, due to aging, illness, etc., the gums degenerate and shrink, so it is conceivable that the denture plaster model may need to be changed or retaken each time.

[0005] Implant procedures consist of an implant body (artificial tooth root), an abutment (support), and a superstructure (artificial tooth). Since a metal artificial tooth root is embedded in the jawbone, reinforcing materials may be used for patients with thin jawbones. However, there have been reports of accidents such as jawbone fracture, and the procedure places a significant burden on the body. Furthermore, maintenance after placement is necessary, resulting in high costs.

[0006] Furthermore, various types of attachments are available, including magnetic, flexite, comfort, metal base, and resin base. Among these, magnetic devices for dentures have strong magnetic attraction, and it is rare for them to wobble or for the dentures to come loose. However, because it is necessary to implant the magnetic metal that attracts the dentures, they are often used in combination with implants (artificial tooth roots). [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 7125686 [Patent Document 2] Patent No. 7224581 [Non-patent literature]

[0008] [Non-Patent Document 1] Chemistry of Spherical Magnet Atoms, 2013, Masato Hoshizaki [Non-Patent Document 2] Magnetic Devices for Dentures: A New Prosthetic Treatment Using Magnets, 1992, Medical Pharmaceutical Publisher, Takanobu Tanaka [Non-Patent Document 3] The Story of Shock Waves, 1997, by Kazuki Takayama, Japan Standards Association. [Non-Patent Document 4] Japanese Society of Magnetic Dentistry: Research Study for Clinical Evaluation and Development (Update) of Dental Magnetic Attachments, March 2019; 2018 Japan Dental Association Federation Business Report; Masayuki Hideshima, Toshihiro Okubo, Shuji Okawa, Shinichi Masumi, Yukyo Takada [Overview of the project] [Problems that the invention aims to solve]

[0009] Conventional magnetic dentures involve implanting metal abutment teeth with attached keepers, or implanting root plates and magnetic metal keepers into the tooth roots to create dentures with strong magnetic attraction. However, these magnetic dentures are only applicable when tooth roots remain. Furthermore, numerous developments have focused on magnetic materials and methods of attaching magnets to further enhance magnetic attraction. For example, Patent Document 1 discloses a container for housing magnets, and Patent Document 3 discloses a magnetic denture and magnetic attachment in which multiple permanent magnets, the same number as the opening of the cap, are housed in recesses in the cap and then covered with a lid.

[0010] However, magnetic dentures and magnetic attachments require the implantation of magnetic metals such as abutment teeth, root plates, and keepers into the tooth roots and their fixation with magnetic materials embedded in the denture base and denture base. In elderly individuals or those who have experienced prolonged tooth loss, the jawbone often atrophies and tooth roots are absent, making it difficult to use conventional magnetic dentures and magnetic attachments.

[0011] Furthermore, the magnetic metal implanted in the tooth root necessitates a procedure similar to that of dental implants, and there are also potential problems such as gum inflammation.

[0012] In view of the above-mentioned problems, the present invention aims to reduce medical costs and alleviate the physical burden on patients by providing an artificial denture magnet device structure and a magnet device for encapsulation and formation into existing artificial dentures that prevent the N and S poles from rotating and losing magnetism due to the attractive force between magnets such as spheres, and that strongly attract dentures to the gums with magnetic field lines without implanting magnetic metal in the tooth root, thereby ensuring the stability of the dentures while providing a comfortable fit. [Means for solving the problem]

[0013] To solve the above problems, the artificial denture magnet device structure according to the present invention is an artificial denture magnet device (hereinafter referred to as the denture magnet device) that is rust-proof, corrosion-resistant, oxidation-resistant, and wear-resistant, consisting of a denture base with embedded magnets and artificial teeth, and an artificial denture magnet device for adult oral dentures (hereinafter referred to as the denture magnet device) that is formed by encapsulating it into an existing artificial denture. The magnet device is formed by encapsulating a permanent magnet of 20 mm or less in artificial gums or coating the magnet with resin or acrylic resin, and embedding and encapsulating it in a denture base, and is designed to attract to human gums by a magnetic force that requires three times the magnetic field lines of the magnets themselves.

[0014] It is preferable that the magnets in the denture magnetic device be embedded or sealed within multiple parts of the denture base.

[0015] The denture magnetic device is designed and worn in a way that allows it to grip the gums through strong magnetic attraction, even in cases of tooth root loss, and can be applied to both complete and partial dentures.

[0016] Furthermore, while it is preferable that the rust-proof, corrosion-resistant, oxidation-resistant, and wear-resistant magnets of denture magnet devices be formed and coated with synthetic resins such as polyvinyl acetate, polyethylene, nitrile, and polyvinyl chloride, plastics, metals such as carbon, or latex, this is not always necessary and is not limited to these materials.

[0017] The denture magnet device of the present invention is used in daily clinical practice as a denture (complete denture, partial denture). Compared with implant surgery that implants metals or the like into the human body, it is simple and safe, and the accompanying clinical techniques are also straightforward. However, it is considered a clinically useful means due to space limitations.

[0018] For the installation position of the denture magnet device, a hole is provided in the denture base, and a cylindrical socket into which a permanent magnet with a diameter of 5 mm to 8 mm or 20 mm or less is inserted is encapsulated, and then wrapped and embedded with acrylic resin. However, magnets that have been subjected to rust prevention, corrosion resistance, oxidation resistance, and wear resistance processing, such as round, square, ring, ball, segment, dome, trapezoidal, U-shaped, powder, sheet type, etc., can also be wrapped and embedded in the denture base with acrylic resin and adsorbed by the magnetic force lines between the magnets.

[0019] The structure of the denture magnet device of the present invention is fixed to the jawbone and gums by the magnetic force of the embedded magnets. Today's magnets continue to be improved in terms of material and structure. As a result, it is now possible to produce free forms, especially a magnet structure with an ultra-thin thickness of 0.1 mm. Among permanent magnets, a neodymium magnet, when a magnet with a diameter of about 10 mm is held in the palm of the hand and iron objects or magnets are placed from the outside around the palm, will remain attracted by the magnetic force of the magnet in the palm. From these phenomena, it can be proven that magnetic force lines can penetrate through human bones and flesh, and it is also possible to be fixed as a denture base by sandwiching the magnets of the present invention. In addition, a denture base for embedding and encapsulating magnets is provided for both complete dentures and partial dentures. For example, there is no need to wear a clasp used for partial dentures, so the denture magnet device structure does not damage existing teeth and gums.

[0020] [[ID=ll]] Furthermore, the attractive holding force generated between the magnets is characterized by being maximum when trying to pull them apart in the magnetic flux direction generated between the two, and minimum in the direction perpendicular to the magnetic flux. A detachment method utilizing this is employed, but in some cases, detachment may be difficult due to the structure. The present invention also devises a method for detaching the denture. It is easy to disassemble, and after disassembly, there is also a reconstruction method for reattachment, which also leads to a reduction in treatment costs.

[0021] Regarding dentures to be implanted and encapsulated, for example, in a resin-based denture, so-called a general denture, the gum part is made of acrylic resin (plastic, etc.), and a basically round magnet that acts as the root of an artificial tooth is inserted. The denture is sandwiched and attached between the front side of the tooth alignment and the oral cavity side, and can be detached by shifting the denture left and right or weakening the magnetic force by reducing the size of the magnet. As an example, it can be detached when shifted by 1 mm or more.

[0022] An implant is a part for attaching artificial materials or accessories for artificial teeth. In dentistry, a part or all of the root made of a material that is familiar in current research is embedded in the jawbone that has been lost (naturally or due to an accident), and an artificial tooth made of plastic, ceramic, etc. is attached to it as a base, and these are called implants. Different from the conventional method in which a hole is made in the jawbone with a gingival punch, excavation is performed, and when the jawbone is thin, a method of increasing the jawbone is used. The present invention, like conventional denture attachment, is in a state where all teeth have been lost (edentulous jaw), but there is no pain or swelling, and normal eating can be done from that day. This is because excellent magnets have been continuously discharged after the war in 1945, and among them, the energy product of neodymium-iron magnets far exceeds BHma×360 KJ / m 3 (45 MGoe), and the magnetic properties are improving. To make use of this property, high skill and carefulness of dentists are required.

[0023] This is also because it does not have a complicated form that makes it difficult to clean the oral cavity, and is not significantly different from natural teeth in this regard. Oral cavity cleaning also has the characteristic that the plaque control record (PCR) is almost the same as that of natural teeth. Therefore, oral cavity management can be the same as usual (for natural teeth) oral cavity cleaning. The above-mentioned implant denture has a detachable denture magnet device structure.

[0024] The implant-supported denture of this invention, although there are individual differences among patients, is fitted with the artificial denture between approximately 35mm and 45mm from the first premolar to 50mm from the lower dental arch on the oral side of the denture, with a protrusion of approximately 2.5mm, a pipe of approximately 2.5mm thickness embedded, and a magnet embedded within it. The outer surface of the artificial denture is also protruded by approximately 2.5mm, and a magnet of approximately 5mm in diameter is embedded within the artificial denture, but this does not affect the appearance of the patient.

[0025] The magnets of this invention are round and square in shape. When using spheres or hemispheres, the strength of the magnetic field lines is varied, and the force F[N] acting between like poles or opposite poles of the magnets is calculated to prevent magnetic saturation in the narrow space of the oral cavity.

number

[0026] When chewing food while wearing dentures, 00g f ~2kg f Although the load is assumed to be 500-700g, the denture magnet device of the present invention has an attractive force of 500-700g. f This means that, taking into account the effects of magnetism on the human body, a range is set in which the denture magnet device will not detach even without excessive attraction, making it possible to attach and detach it without difficulty.

[0027] Furthermore, when considering occlusal load, round magnets, spherical magnets, and square magnets, which have less cracking and chipping and higher mechanical strength, are used, but are not limited to these.

[0028] The attractive force of a magnet increases with increasing contact area, and in the case of spherical magnets, the thicker the magnet, the easier it is to attract the centers of two spherical surfaces together. For example, in situations where even a 0.1 mm difference is unacceptable during installation, the attractive force decreases to approximately 55% when the diameter is reduced to 3 / 4. Therefore, dentures lacking rigidity due to even slight differences will deform under manual pressure during biting. Accordingly, the design incorporates magnets to ensure strength and rigidity in the dentures, resulting in a good biting sensation when wearing them.

[0029] When multiple magnets are embedded in the denture magnetic device of the present invention, round, spherical, and square magnets are embedded at intervals of 5 mm to 9 mm between the front and side surfaces of the denture base, and the denture is attached by sandwiching the gums between these magnets. When only one magnet is embedded, it is embedded on the anterior side of the denture, and the denture does not become dislodged during normal biting or chewing hard foods, and the denture can be removed more easily.

[0030] The denture magnet device of the present invention is intended for use within the specifications of general complete dentures, but it can also be used with partial dentures or special dentures for the oral cavity, depending on the position where the magnet is embedded. [Brief explanation of the drawing]

[0031] [Figure 1] Diagram showing an externally applied magnetic field. [Figure 2] Diagram showing magnetic field due to magnetization [Figure 3] Diagram showing a uniform magnetic field inside a sphere [Figure 4] Top view showing denture magnet devices embedded on the inner and outer surfaces of a pre-fabricated denture base. [Figure 5] Front view showing denture magnet devices mounted on the outer surfaces of the denture bases of the upper and lower dentures of a pre-made denture. [Figure 6] Side view of a denture with magnets embedded on the outer surface of the denture base under a denture magnetic device. [Figure 7] Side view of a denture magnet device coated with acrylic resin. [Figure 8] Back view of a denture magnet device with magnets coated in acrylic resin. [Figure 9] Enlarged lateral view showing a denture magnet device attached to the gums (jawbone). [Figure 10] Perspective view of a denture magnetic device with socket stopper. [Figure 11] Standard dimensions of complete intraoral dentures [Figure 12] Diagram showing a diatomic molecule as an example of molecular structure. [Figure 13] Diagram showing silicone bonded to the denture base of a denture magnet device. [Figure 14]Diagram of the equation of motion for air column oscillation in the oral cavity [Figure 15] (a) Cross-sectional view of the denture magnetic device being shaken from side to side when removed. (b) Cross-sectional view of the denture magnetic device that has shifted and come off. [Modes for carrying out the invention]

[0032] The denture magnet device structure according to the present invention is a denture magnet device that is rust-proof, corrosion-resistant, oxidation-resistant, and wear-resistant, consisting of a denture base with embedded magnets and artificial teeth, and a denture magnet device that is formed by encapsulating it in a pre-existing denture. The denture magnet device is formed by inserting a permanent magnet of 20 mm or less into artificial gums or by coating the magnet with resin or acrylic resin, and embedding and encapsulating it in a denture base. By attracting it to the human gums with a magnetic force that requires three times the magnetic field lines of the magnets themselves, it can be used as a denture without the need for procedures such as embedding metal in the tooth roots.

[0033] Furthermore, since this denture magnet device does not require any procedure on the human body, it can be implanted or encapsulated into commonly used, pre-fabricated dentures.

[0034] The denture magnet device of the present invention does not require abutment devices such as partial dentures or overdentures, and adheres to the gums with the denture body itself. Clasps used in conventional dentures require prior testing of retention force (force that resists detachment), support force (effect that supports function), and gripping force (effect that resists lateral movement) before the denture is manufactured and adjusted, but these tests become unnecessary except in special cases.

[0035] The denture magnet device of the present invention uses magnetic structures arranged at intervals of a few millimeters to grip the gingiva (gums) when worn, and maintains magnetic force between the magnetic structures while worn, and is horizontal to the direction of insertion and removal of the denture, which are essential for more effective use.

[0036] Today's magnets can be manufactured with a thickness of less than 1 mm, thanks to continuous improvements in materials and structure, and remarkable advancements in processing methods. As a result, it is now possible to create magnets of any shape and ultra-thin magnetic structures as thin as 0.2 mm.

[0037] Furthermore, there are many types of magnets, differing not only in size and retention force, but also in shape and connection state. Since there is little literature on what magnetic force is necessary for denture attachment, based on experiments and the experience of dentists, dentures weigh between 800g and 2kg, and typically around 500-700g. f It is said that retention force is necessary. In the fabrication of dentures, fit, external shape, occlusion, and rigidity are the basic elements, and consideration must be given to reinforcing structures and frame designs, including occlusal registration, artificial tooth arrangement, and grinding, and symmetry must be taken as much as possible, as well as ample space and room to enhance self-cleaning and hygiene.

[0038] Even in the design of general dentures other than those using a denture magnetic device structure, if rigidity is lacking, deformation of the denture base due to occlusion can be expected. Considering the possibility of discomfort such as difficulty biting through food, anxiety when biting hard, and changes in shape due to improper care by the denture wearer, it is crucial to ensure a three-dimensional reinforcing structure.

[0039] While the largest possible magnet size is selected for use in denture magnet devices, the development process focused on maximizing magnetic force rather than simply size, using a formula to determine the optimal magnetic force. However, experimental results provide a more accurate understanding of magnetic force. Experiments have confirmed that, regardless of magnet size, increasing the leakage magnetic field reduces the attractive force between magnets, and even small magnets can achieve maximum magnetic force if they exert a strong magnetic output.

[0040] Generally, magnets are surface-treated, and coatings or platings such as nickel, epoxy, nylon, fluororesin, zinc, gold, chromium, tin, and rhodium are applied to prevent rust, corrosion, oxidation, and wear. The ferrite magnets used in this invention are made from iron oxide and are therefore considered resistant to rust. However, because they are used in the oral cavity, it is preferable to apply rust prevention, corrosion resistance, oxidation resistance, and wear resistance treatments. Furthermore, if the denture is subjected to impact, the orientation of the magnetic poles of the magnet atoms may be disrupted, causing demagnetization. Therefore, it is preferable to coat them with resin or the like after the rust prevention, corrosion resistance, oxidation resistance, and wear resistance treatments.

[0041] Conventional implant procedures involve the location or surrounding areas of the human gums, tooth roots, alveolar ligament, and alveolar bone. After implant placement surgery, maintenance is required by the patient, dentist, and dental technician. Since typical implants cannot be removed by the user, there are virtually no non-surgical options if problems such as repairs occur. In particular, for elderly people who frequently undergo hospital examinations, metal in the body can often be a problem. If dentures that provide sufficient adhesion are removable, maintenance is easier, they are safer to use, and they have less impact on the human body. Furthermore, if dentures are not properly fitted, speech can be difficult to understand, and chewing is also affected. Dentures that are worn constantly are practically a part of the body, and a strongly adhesive denture magnetic device can be worn in a healthy state regardless of the oral environment. The denture magnetic device of the present invention is characterized by the fact that magnets are attached to the gums in the oral cavity from the front to the back of the gums using magnetic force that requires magnetic field lines, and they attract each other with straight magnetic field lines. As shown in Figure 9, the natural gum tissue is sandwiched between the front and back surfaces of the artificial gum, and the natural gum is connected to the artificial gum by magnetic field lines, eliminating the need for surgery or other procedures. However, it cannot be said with certainty that there will be no adverse effects on the human body in the event of an accident while wearing the device.

[0042] Furthermore, magnets can lose their magnetic force during use, and this is due to three factors: external demagnetization, self-demagnetization, and temperature demagnetization. To counteract this demagnetization, simply attaching the magnet to another magnet with a stronger magnetic force can restore its magnetic force, aligning the magnetic poles of the atoms and making them more responsive. In this case, one consideration would be to use the denture magnet device of the present invention in a dedicated storage case with a strong magnetic force, but as a simpler method, the magnetic force can be restored by bringing a strong magnet into contact with the denture magnet device.

[0043] For the spherical and hemispherical magnets used in denture magnet devices, the surrounding magnetic flux density was taken into consideration. In other words, the relationship between the three-dimensional movement of the sphere and hemisphere and the magnetic force at the time of collision was investigated to see if the impact on the sphere and hemisphere could be weakened. It is well known that magnets are susceptible to impact and can break, but by avoiding direct impact on the magnet, the impact on the jawbone and gums is minimized, and the magnet is not damaged. In the experiment, the impact was a compression wave of varying strengths and weaknesses. The impact is very weak in air, but the oral cavity is narrow and there are rapid changes in conditions due to eating and drinking, so measures were taken to attenuate the shock waves when eating hard foods or chewing. In addition, if the artificial teeth of the denture are in a pulp cavity (cavity), this may help to mitigate the impact caused by occlusion when the denture is worn.

[0044] As shown in

[0043] above, shock waves caused by biting during eating and drinking are actually experienced by many patients. For example, when dentures collide in the oral cavity because food such as cabbage or burdock cannot be bitten through, the instantaneous pain accompanied by a strange sound causes the patient to cry out, which is precisely the moment when a shock wave occurs, and this shock wave is a major problem for denture wearers. In

[0008] [Non-Patent Literature 3], experiments were conducted using a shock wave tube improved for physicochemical phenomena, and it was found that physically, shock waves are represented as waves accompanied by very steep pressure, and mathematically, as surfaces where the pressure changes discontinuously. When experiments were conducted using an electron microscope with a size of approximately 20 mm, similar to that of dentures, the pressure, velocity vector direction, etc., outside of the shock wave were visualized by image processing using computer graphics (hereinafter referred to as CG). From this, it can be concluded that the silicone on the oral cavity side of artificial dentures shown in Figure 13 is effective in preventing pain during biting and speech difficulties, and it is an inexpensive method.

[0045] Furthermore, as described in Reference 1, if we consider spherical magnets, which are metal spheres of the same radius uniformly magnetized, as atoms, and multiple such magnets joined together as molecules, then since there is only one type of atom, the molecule is determined by the arrangement and polarity of the constituent atoms, and molecules possess mutual potential energy (MPE) due to the repulsive and attractive forces between atoms. MPE is a function of the arrangement and polarity of the constituent atoms, and a molecule is stable when it is at the minimum point of MPE. That is, if the arrangement and polarity are shifted slightly from the minimum point, it will try to return to the original arrangement and polarity. As shown in Figure 12, this is the state where MPE is minimized in an arrangement where two atoms are touching. In Figure 12, the black arrows represent the magnetic moments of the atoms, and the dashed arrows represent the resultant force of the forces that the atom receives from other atoms. Since the two atoms attract each other and are stable in forming a molecule, it is possible that a denture magnet device using spherical magnets can maintain a stable attractive force when worn, although there are dissenting opinions. However, iron is composed of atoms, not molecules. In this process, the magnetic mass is crushed using a jet mill, and then decomposed using a thermal decomposition method that typically involves electrochemical reduction and aggregation followed by superheating. By dividing it into nanometer-sized particles, it becomes molecular-level rare earth powder particles too small to be seen with the naked eye. It was a molecular-level magnetic material where it was impossible to even determine whether the magnetism was weak or if the magnetic poles were lost due to the heat. Therefore, we adopted the calculation formula based on the generally accepted magnetic molecular theory. These were verified using various equipment and instruments from the Industrial Technology Center and private companies, as well as a large electron microscope, but whether similar results can be obtained is still under research, and no conclusion has been reached.

[0046] Spherical magnets (ball-shaped magnets) used in denture magnetic device structures have several advantages: they are less prone to cracking and chipping, have high strength, and are resistant to rust due to surface treatments such as nickel plating. While there are individual differences in occlusal force in the oral cavity, strong forces can be expected, and given that they are used in an environment where moisture from saliva is constantly present, spherical magnets (ball-shaped magnets) are considered the most suitable magnets for use in denture magnetic devices. However, it should be considered that the magnet portion may be easily replaced by a dentist or dental technician as it deteriorates due to rust, demagnetization, etc.

[0047] Furthermore, spherical neodymium magnets, which can be miniaturized using a strong magnetic field and are therefore widely used, can also be used for small dentures and denture bases with thin walls.

[0048] However, since the strength of the magnetic force is determined by the height and contact area, and greatly affects the magnetic force value, using magnets that can obtain a larger contact area, such as cylindrical or square shapes other than spherical ones, can reduce the number of magnets that need to be implanted. In addition, the best combination of magnets is selected according to the strength of the magnetic force and the shape of the denture, and the magnetic force and shape are adjusted, such as spherical or square shapes, and sizes of 20 mm or less.

[0049] While the reliability of the surface magnetic flux density of magnets is ensured by using regularly calibrated measuring instruments, the commonly cited attractive force is not subject to publicly defined measurement standards or methods, and therefore each measurer uses their own unique standards and methods. Although the attractive force of a magnet is considered only a reference value, in this invention, since it is used for the purpose of attraction, the magnet is selected based on its attractive force.

[0050] Permanent magnets include neodymium magnets, samarium-cobalt magnets, ferrite magnets, and alnico magnets, listed in order of increasing coercivity. High coercivity allows for the creation of strong magnets even in thin, plate-like forms. Alnico magnets have low coercivity and tend to demagnetize easily when made into thin plates where the north and south poles are close together. However, neodymium magnets have very high coercivity, allowing for the creation of strong magnets even in thin, plate-like forms. Therefore, in the oral cavity, where space is limited, neodymium magnets are preferable.

[0051] Furthermore, although the strength of a magnetic field cannot be directly seen with the five human senses, by bringing a magnetic fluid uniformly dispersed on a sheet into contact with a magnetic surface and observing the magnetic flux distribution, it is possible to indirectly confirm the presence of the magnetic force of the denture magnet device of the present invention by using it as a simple magnetic sensor.

[0052] Magnets exhibit performance differences depending on their shape. When using the same material but with different dimensions, the complex shape significantly impacts performance, and the thicker the magnetization, the stronger it becomes against heat and reverse magnetic fields. Therefore, using spherical magnets that allow for increased thickness even in confined spaces is important. This can be quantified using the permeance coefficient (PC), and when comparing neodymium magnets with different outer diameters and thicknesses, regardless of the outer diameter, thicker magnets have a higher permeance coefficient and are stronger against heat and reverse magnetic fields. This makes them useful for denture magnet devices used in the oral cavity, where temperature fluctuations occur.

[0053] Denture magnet devices use round, square, and spherical magnets. In the case of round magnets, the magnetic force is evenly distributed along the horizontal axis of the plane, and it is well known that the magnetic force increases with the height of the magnet, and is greatly related to the magnetic flux density. This is because, with respect to the magnetization direction, the higher the height, the higher the magnetic flux density, and since magnetization occurs in the height direction, the magnetic force becomes stronger in proportion to the height. Denture magnet devices used in the oral cavity, where the contact area is limited, need to be held between the gingiva (jawbone) by the magnets, so the distance between spherical magnets must be considered.

[0054] Furthermore, the magnetization direction of the magnets can be as follows: for cylindrical magnets, it can be in the height direction, radial direction, double-sided 4-pole, double-sided 4-pole, single-sided 2-pole, single-sided 2-pole, single-sided multi-pole, single-sided multi-pole, or outer circumference multi-pole; for ring magnets, it can be in the height direction, radial direction, single-sided multi-pole, inner circumference multi-pole, or outer circumference multi-pole; for rectangular magnets, it can be in the height direction, single-sided multi-pole, or double-sided multi-pole; for segment C-type magnets, it can be radially in the outer diameter N and inner diameter S, radially in the outer diameter S and inner diameter N, height direction, width, or spherical (ball-type) radial direction. In this invention, the magnetization direction is selected depending on the direction in which the magnet is embedded in the denture.

[0055] In terms of denture structure, there is a difference in the length of the denture base between the anterior teeth and the left and right posterior teeth. In the denture magnetic device structure, multiple magnets are placed on the denture base, but the denture base for the anterior artificial teeth has a tooth root portion that does not reach the jawbone or gums. This is due to the thin width structure of the anterior side of the denture, and in addition to connecting the artificial teeth, the purpose is to increase the strength of the thin surrounding area by embedding magnets.

[0056] Furthermore, when using magnets, the magnetic permeability becomes extremely low, which can lead to magnetic saturation close to a vacuum. To control these issues, semiconductors are being used to accumulate data. By aggregating more data, it will be possible to create smaller and lighter devices, improve accuracy and performance, and enable treatment for a larger number of patients.

[0057] The magnets used in this invention are round, square, and spherical, but among them, the spherical magnets do not change shape even when external force is applied or they are rotated. This is because they possess rotational symmetry, which refers to the property that the exact same shape is repeated with a rotation of 2π / n (where n is a positive integer). Considering motion or operations that are performed without changing the distance from a fixed point or the relative position between them, and without axial movement, experiments using this calculation method showed that among the many advantages of spheres, the spherical magnet has a large space for confining the magnetic field lines in a small area, and because it is the same shape and easy to handle, it can be used in narrow places such as denture bases, but a large number of magnets need to be implanted.

[0058] Conventional magnetic dentures are all vertical and require surgery to implant metal or other keeper components. However, the magnetic device of the present invention uses magnetic force to sandwich the natural jawbone and the natural gums covering the jawbone between horizontal magnetic keepers, a method that has never existed before, resulting in a bloodless denture. Moreover, it can be used from the day of insertion, takes no time, and costs about the same as a regular removable denture. The magnets of the magnetic attachment of the present invention are placed in multiple locations, but the formula for calculating the distance between two points is generally a function d that satisfies three conditions: if a≠b, then d(a,b)>0, d(a,a)=0, d(a,b)=d(b,a), and d(a,b)+d(b,c)≧d(a,c).

[0059] Furthermore, Non-Patent Document 4 describes the long-term clinical application evaluation of currently used magnetic attachments conducted by various institutions, detailing their effectiveness, progress, and abutments. According to these findings, while magnetic attachments are slightly inferior to conventional implants in terms of retention and masticatory function, they are recognized as effective in maintaining comfort and periodontal tissue health. However, even with magnetic attachments, surgical procedures are required to implant the support base, which does not change the burden on the patient. The denture magnetic device of the present invention allows for the attachment of dentures without burden by clamping the gum tissue from both sides using magnetic force, without the need to implant abutments or other structures within the gum tissue.

[0060] Hereinafter, preferred embodiments of the present invention will be described based on the drawings. Figure 4 shows a denture magnet device 2 embedded in three locations on the front, inner, and outer sides of the denture base 7 of a pre-fabricated artificial denture 1.

[0061] Figure 5 shows a ready-made artificial denture with five magnetic devices 2 implanted and fitted into each of the upper and lower dentures. However, the number of implanted magnetic devices 2 and the implantation positions can be increased or decreased to match the shape of the denture.

[0062] Figure 6 shows a denture magnet device 9 in which a magnet 5 is coated with acrylic resin 13 and embedded and fitted to the left, right, front, and back sides of the denture base 7. However, if a socket or the like is not used, the size of the magnet can be wider, and the denture magnet device 9 can be selected according to the shape of the magnet (such as cylindrical or square), the thickness and size of the denture base, and the type of denture (such as a partial denture).

[0063] Figure 7 shows a magnet 5 coated with acrylic resin 13. In addition to acrylic resin and other resins, coatings that provide rust prevention, corrosion resistance, oxidation resistance, and wear resistance are preferable.

[0064] Figure 8 is a bottom view of a denture magnetic device 9 in which a magnet 5 coated with acrylic resin 13 is embedded and fitted into the denture base 7. When attached to the gums (jawbone) 10, the denture magnetic device 9 is attracted to the gums 10 by the magnetic force of the magnet 5, as shown in Figure 9. The embedding and fitting position of the magnet 5 is changed depending on the length of the denture base 7, but it is preferable to select it based on the condition of the patient's gums (jawbone) 10.

[0065] Figure 10 is a side view of an example of a commercially available artificial denture magnet device 2, but the angle and shape of the bent portion 6 of the socket 4 can be selected depending on the size of the socket 4.

[0066] Furthermore, when a denture device 2 or 9 with a magnet 5 embedded and fitted is stored using a method that prevents magnetic fields from passing through, the magnet will be positioned in the middle of the socket 4. The magnetic force of the magnet 5 will cause it to move toward the bent portion 6, maintaining suction by gripping the gum (jawbone) 10. In the event that the denture base 7 is damaged by some impact, this prevents the magnet 5 from being released from the socket 4. Additionally, by passing the stopper 3 through the rear and pressing it against the denture base 7, the denture magnet device 2 can be embedded and fitted into the denture base 7 in a stable and fixed state.

[0067] Figure 11 shows the standard dimensions of a complete denture. The denture magnet device of the present invention is supervised by an oral surgeon and is naturally used within the specifications of a complete denture. However, in the case of special dentures such as partial dentures or dentures where the gums (jawbone) 10 have atrophied due to aging, the size of the denture magnet device 2 and the implantation position of the magnets are determined under the guidance of an oral surgeon to create a safer denture.

[0068] Figure 13 shows silicone 11 bonded to the denture base 7 and a denture magnet device 9 embedded in the denture base. The bonding position 12 of the silicone 11 is determined based on the condition of the patient's gums (jawbone), such as gums that have degenerated due to aging, or gum elevation after tooth loss due to an accident, and this, along with whether or not to use silicone. Silicone 11 is not always used, and the decision largely depends on the examination by an oral surgeon or dentist.

[0069] Figure 14 shows the equation of motion for the vibration of an air column in the oral cavity. Let S be the cross-sectional area of ​​the mouth, and L be the length from side to side of the mouth. The vibration of the air column in the oral cavity is given by the density of the gas, the pressure, and its bulk modulus, as shown in the figure. TIFF2026046964000003.tif8170 When motion occurs and this small volume of gas is displaced by u, the gas is easily compressed, therefore the small volume Let's assume that TIFF2026046964000004.tif13170 is small. First, let's consider the impact that occurs as a result of this displacement, for example, when biting or tearing something. TIFF2026046964000005.tif33170[Formula 111] TIFF2026046964000006.tif47170[Formula 222] Therefore, the equation of motion at work here is [Equation 333]. [Formula 333] TIFF2026046964000008.tif2087 is equivalent to [Formula 444]. [Formula 444] TIFF2026046964000009.tif1956u is a function of x and t, so it has been expressed as a partial fraction. This equation of motion is identical in form to the diagram of string vibration (P66) and the movement of the mouth, so the solution is similar, and it is u = U0sin(ωt+φ)sin(kx+ψ). However, [Equation 555]. [Formula 555] TIFF2026046964000010.tif1929

[0070] A fitting test was conducted on a model using the denture magnet device of the present invention. For the upper denture, socketless magnets 5 were embedded and fitted into three locations on the denture base. The magnets exhibited strong attraction and did not detach or fall out. However, removal was sometimes difficult depending on the angle at which the denture was shook by hand.

[0071] Because the denture base of partial dentures is narrow, they were attached using a socketless denture magnetic device. By selecting the size and shape of the magnet, sufficient magnetic force was achieved. For partial dentures that are not intended to be removed, a magnet with a stronger magnetic force can be used, and they can be attached without using clasps (fasteners).

[0072] Furthermore, when the lower denture with the magnetic device for dentures of the present invention was fitted in a living organism under the supervision of an oral surgeon, even in elderly individuals with atrophied lower gums (jawbone), the magnetic force gripped the gums (jawbone) at one point on the front and back sides of the center, preventing the lower denture from coming loose and ensuring a tight fit. As shown in Figure 15, when removing the lower denture from the gums (jawbone), as shown in Figure (a), sliding the lower denture from side to side by hand created a gap as shown in Figure (b), allowing it to be easily removed even with the weak grip strength of elderly individuals.

[0073] Although the present invention has been specifically described above based on examples, it goes without saying that the present invention is not limited to the above examples and can be modified in various ways without departing from its essence. For example, although the above-described examples show an example for complete dentures, it can also be applied to partial dentures or by changing to various different shapes. [Explanation of symbols]

[0074] 1. Pre-made artificial dentures 2. Magnetic devices for existing dentures 3. Stopper Stick 4 sockets 5 Magnets 6. Bends 7 Denture base 8. Artificial teeth 9. Denture magnetic devices 10. Gums (jawbone) 11 Medical-grade silicone 12 Medical silicone implant site 13 Acrylic resin

Claims

1. An artificial denture magnet device comprising an artificial denture base and artificial teeth in which magnets are embedded, The aforementioned artificial denture magnet device is characterized by having permanent magnets of 20 mm or less inserted into the artificial denture portion, with multiple magnets enclosed in the artificial denture base, and the magnetic field lines between the magnets sandwiching and attracting the human dental base.

2. A magnetic device for pre-made prosthetic dentures, which is embedded and sealed into a pre-made adult oral denture consisting of an artificial denture base and artificial teeth, The aforementioned magnetic device for artificial dentures is characterized by inserting and forming a plurality of permanent magnets of 20 mm or less into a pre-existing artificial denture base or an existing adult oral denture, and using the magnetic field lines between the magnets to sandwich and attract the human dental base.

3. The magnets of the artificial denture magnet device and the commercially available artificial denture magnet device are round, cylindrical, spherical, hemispherical, square, rectangular prism, perforated, square, ring-shaped, ball-shaped, segment-shaped, dome-shaped, trapezoidal, U-shaped, powder, sheet-shaped, etc., with a diameter of 20 mm or less, and are subjected to rust-preventive, corrosion-resistant, oxidation-resistant, and wear-resistant processing, and are embedded in the artificial denture base, and the magnets are used to sandwich and attract the human dental base by magnetic force, as described in claim 1 or 2.

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