JP7153298B1 - Dentures and their attachments - Google Patents

Abstract

The present invention provides a denture and an attachment for the denture that allow a denture wearer to wear the denture for a long period of time with a normal occlusal force and feel a comfortable bite while eating. A keeper (250) made of a magnetic member that can be fixed to a stump (20) and adheres closely to the stump (20) by the magnetic pulling force of a magnet (150) is attached to the upper surface of the stump, and the denture is attached to the denture base with the mucous membrane of the stump. A housing accommodating recess 130 is formed to insert and hold the portion protruding from the housing, and this recess is provided with a magnet accommodating housing 160 having a magnet accommodating space that accommodates a magnet movably in a predetermined direction. is formed with an inward flange 162 for preventing the magnet from falling off, and the magnet in the magnet housing is oriented in a direction that connects the side of the denture that adheres to the mucous membrane of the denture base and the artificial tooth located on the top of the magnet housing. can move freely along the [Selection drawing] Fig. 1

Description

The present invention relates to dentures and their attachment attachments.

With the recent aging society, it has been observed that if the decayed tooth is left untreated for many years, the state of the crown of the tooth deteriorates, and eventually the crown collapses. The same applies to the case where a carious tooth has been treated a long time ago and a metal crown has been placed on it, but after many years have passed, the carious tooth that has developed inside gradually progresses and becomes considerably worse.

When such a state is reached, it is conceivable as a temporary countermeasure to remove the crown portion and leave only the root of the tooth, and use it as an abutment tooth to mount a conventionally known denture.

However, when wearing such dentures, it is essential to use a clasp (hook) on the part of the abutment teeth that supports the dentures. Therefore, when the mouth is opened, the metal part of the metal clasp can be seen from the outside, making it obvious that the other party is wearing dentures during a conversation. unfavorable to

On the other hand, if the extracted tooth is left unattended, the food cannot be sufficiently masticated and swallowed as it is, putting a burden on the digestive system and harming health. Therefore, a structure is known in which a keeper made of a magnetic material is embedded in the upper part of the stump, and a magnet housed inside the denture is brought into close contact with the upper surface of the keeper to fix the denture to the abutment tooth (see, for example, patent Reference 1).

JP 2011-224109 A

The above-described conventional magnetic attachment uses a disk-shaped magnet, but in the configuration of this conventional technique, the upper surface of the keeper and the lower surface of the magnet remain in contact and fixed without changing their positions at all. It maintains its position.

Therefore, when the denture is attached to the abutment tooth and then occlusion, if an occlusal force is applied to the abutment tooth through the denture, this occlusion force acts almost directly on the abutment tooth as a buckling load. Due to this, the magnet slides and falls off the keeper, resulting in a buckling failure condition and damaging the mucous membrane. As a result, the denture wearer feels severe pain and cannot maintain the wearing state as it is.

Even if the buckling phenomenon does not occur as described above, an occlusal force exceeding the allowable load that can be borne is applied to the root stump, and the fibrous tissue that connects the stump and the jawbone is damaged. cause damage to the periodontal ligament. Furthermore, since the occlusal force differs depending on the person who wears the denture, if the occlusal pressure is strong, the tooth root will break at once. In other words, the root stump splits and the protuberance of the fragment further damages the surrounding tissue. Such an unfavorable phenomenon causes a very serious symptom of traumatic occlusion. Specifically, by using dentures as described above, the onset of traumatic occlusion leads to tooth movement due to the repeated application of a load based on this occlusal force. There is no choice but to extract and remove the residual root that should have played a role in the jawbone.

Since the occlusal force acts as an impact force on the denture and the abutment tooth, the above phenomenon occurs in a short period of time. In other words, it is clear that the configuration of the prior art is mechanically broken from the beginning, and it is a structure that cannot be actually applied in the field of dental care.

It is an object of the present invention to provide a denture that is easy to put on and take off from an abutment tooth, is difficult to come off once it is put on, and allows long-term occlusion with a normal occlusal force, thereby providing a denture wearer with excellent wearing comfort and eating. To provide a high-performance denture and an attachment for the denture giving a comfortable chewing feeling and capable of masticating all kinds of foodstuffs with a strong occlusal force.

In order to solve the above-mentioned problems, the denture and its mounting attachment according to claim 1 of the present invention are:
A denture comprising an elongated denture base in which at least two artificial teeth are arranged adjacently and the plurality of artificial teeth are fixed on the top thereof; and an attachment for attaching the denture to an abutment tooth, wherein In the denture and its mounting attachment that can be attached to the abutment tooth by magnetic pulling force,
The abutment tooth can be fixed to the upper surface of the root stump by attaching a keeper made of a magnetic member formed so as to be tightly coupled to the upper surface of the stump by the magnetic pulling force of the magnet, on the upper surface of the stump. is to be formed,
The denture is formed with a bottomed housing accommodating recess for inserting and holding the portion of the abutment tooth protruding from the mucous membrane at a predetermined position in the longitudinal direction on the bottom side of the denture base that contacts the mucous membrane. and the housing accommodating recess includes a magnet accommodating housing having a magnet accommodating space that accommodates the magnet so as to be movable in a predetermined direction,
The portion of the magnet containing housing exposed from the bottom surface of the denture base is formed with an inward flange that prevents the magnet from falling off from the magnet containing housing when the denture is attached to the abutment tooth,
When the denture is attached to the abutment tooth, the magnet in the magnet containing housing is placed on the side of the denture that adheres to the mucous membrane of the denture base and on the tip side of the artificial tooth that is positioned above the magnet containing housing. It is housed so that it can move freely along the direction connecting
The portion surrounded by the inwardly directed flange of the magnet housing has a magnetic pulling force that causes the keeper to be in direct contact with the magnet when the denture is attached to the abutment tooth, and the denture is attached to the abutment tooth. at least a part of the surface of the keeper that contacts the magnet is formed as a keeper insertion hole that can enter the interior of the magnet containing housing when the keeper is attached to the magnet housing and engaged with the magnet;
When the denture is attached to the abutment tooth, the keeper insertion hole of the magnet containing housing exposed on the bottom surface of the denture base of the denture is brought closer to the keeper, so that the magnet is pulled by the magnetic pulling force of the magnet. The denture is attached to the abutment tooth while the keeper is tightly fixed and the denture is guided to the correct attachment position with respect to the abutment tooth, and in this attached state the entire bottom surface of the denture base of the denture is Together with the adhesion force generated by the close contact through the saliva layer, the denture is maintained in a state of being attached to the abutment tooth,
When the denture is attached to the abutment tooth and then occlusion, the occlusal force sinks the entire bottom surface of the denture base of the denture into the mucous membrane, and the magnetic force of the magnet coupled to the keeper by the magnetic pulling force of the magnet. The magnet is moved in the magnet containing housing to the side of the artificial tooth positioned above the magnet containing housing of the denture by inserting the connecting portion with the keeper from the keeper insertion hole into the magnet containing housing,
According to the degree of occlusion, as the compressive repulsive force applied from the mucous membrane to the denture base sinking into the mucous membrane increases, the magnet further moves within the magnet containing housing toward the artificial tooth side of the denture. and even when the occlusal force becomes the largest and the denture base of the denture stops sinking to the mucous membrane due to a balance with the compressive repulsive force received from the entire mucous membrane in close contact with the denture base, A certain space is ensured between the magnet and a portion of the interior of the magnet containing housing facing the magnet on the side of the artificial tooth.

In addition, the denture and its mounting attachment according to claim 2 of the present invention are the denture and its mounting attachment according to claim 1,
The keeper is attached to the upper part of the implant directly embedded in the jawbone instead of being attached to the upper surface of the stump that is connected to the jawbone through the periodontal ligament.

Further, the denture described in claim 3 is a denture that can be used only for the denture described in claim 1 or claim 2 and its attachment.

According to the present invention, it is easy to put on and take off from an abutment tooth, and once it is put on, it is difficult to come off, and it is possible to occlusion for a long time with a normal occlusal force, so that the denture wearer has an excellent wearing feeling and comfort during eating. It is possible to provide a high-performance denture and an attachment for the denture, which gives a comfortable bite feeling and can masticate all kinds of foodstuffs with strong occlusal force.

1 is a side view showing the structure of a denture and its mounting attachment according to an embodiment of the present invention in a partial cross section along the longitudinal direction of the denture, showing a state in which a denture wearer wears the denture on the abutment tooth. It is a top view which shows the structure of the denture and its mounting attachment shown in FIG. 1 with a partial cross section along the longitudinal direction of denture. FIG. 3 is a partial plan view showing an enlarged part of the plan view shown in FIG. 2; FIG. 2 is a diagram corresponding to FIG. 1 and showing a state immediately before the denture wearer attaches the denture to the abutment tooth and immediately after removing the denture from the abutment tooth; FIG. 2 is a diagram corresponding to FIG. 1, showing a state in which the denture wearer has started occlusion after mounting the denture on the abutment tooth, and the denture base of the denture has sunk to some extent on the mucous membrane. FIG. 2 is a diagram corresponding to FIG. 1, showing a state in which a denture wearer has fully occlusion after fitting a denture to an abutment tooth, and the denture base of the denture has completely sunk into the mucous membrane and has stopped sinking. A cross-sectional view showing a state in which caries has progressed in the crown inside the crown with the metal crown covered (Fig. 7(a)), and a cross-section showing a state in which the metal crown and the crown have been removed from the state in Fig. 7(a). Fig. 7(b) and a sectional view showing a state in which a root canal is formed from the surface of a tooth root (Fig. 7(c)). 8(a) and 8(b) are cross-sectional views sequentially showing the process of pressing the keeper against the upper part of the wax in the correct position and posture using a surveyor after filling the inside of the root canal and the upper part of the tooth root with wax; Fig. 8(c) is a cross-sectional view (Fig. 8(c)) showing a state in which the keeper and wax are pulled out from the root stump for casting the keeper holder after the wax has hardened. After casting the keeper holder, the keeper holder is inserted into the root canal of the stump and both are fixed and combined with adhesive resin. It is sectional drawing which shows the process which fixes and couple|bonds in order of Fig.9 (a) thru|or FIG.9(c). Remove the lid cover of the magnet containing housing containing the magnet, remove the magnet once, insert the positioning adjustment disk into the magnet containing housing, further contain the magnet, cover the housing main body with the lid cover, and reassemble the magnet containing housing. 10(a) to 10(d) are sectional views showing the steps of assembling the . After fixing the keeper to the keeper holder in the order shown in FIGS. 11(a) to 11(b), the magnet containing housing containing the positioning adjustment disk shown in FIG. is a cross-sectional view (FIG. 11(d)) showing a state in which the keeper is attached to the upper part of the keeper via In the state shown in FIG. 11(d), the magnet-accommodating housing was fixed to the housing-accommodating hole via an adhesive resin to the denture of the present invention, which was produced by polymerization using wax dentures according to the usual method. ), and the denture according to the present invention is removed from the abutment tooth from the state of FIG. 12(a). 12(b), and in the state of FIG. 12(b), the keeper insertion hole of the magnet containing housing is used to remove the positioning adjustment disc while pulverizing it, and it protrudes from the top of the keeper. FIG. 12(c) is a diagram showing a state in which the housing mounting position/orientation adjusting pin is removed after the cutting remains and the upper surface of the keeper is polished. Fig. 12(c) is a view (Fig. 13(a)) just before the completed denture according to the present invention is attached to the abutment tooth using the magnetic pulling force of the magnet, and subsequently the present invention. Fig. 13(b) shows a state in which the denture is attached to the abutment tooth using the magnetic pulling force of the magnet (Fig. 13(b)), and subsequently the denture according to the present invention from the abutment tooth to the magnetic pulling force of the magnet. It is a figure (FIG.13(b)) which shows the state which resisted and removed. A cross-sectional view of a state in which caries has progressed to one side of the upper part of the tooth root (right side in the figure) (Fig. 14(a)), and a cross-sectional view of a state in which an appropriate keeper holder and keeper are attached to the tooth root in this state (Fig. 14). (b)), and a cross-sectional view of a state in which the carious tooth has progressed to the other side of the upper part of the tooth root (left side in the figure) (Fig. 14(c)), and a state in which an appropriate keeper holder and keeper are attached to the root in this state. is a cross-sectional view (FIG. 14(d)). FIG. 14 is a view corresponding to FIG. 13 showing a state in which the abutment tooth of the denture according to the present invention is constructed using an implant instead of a stump.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments and modifications of the denture and its mounting attachment according to the present invention will be described below with reference to the drawings. In the following description, drawings are created based on the form of attaching the denture and the attachment for the denture according to the present invention to the stump on the mandibular side of the jawbone.

Therefore, the upward direction, the downward direction, and the horizontal direction in the drawings and texts are defined based on the mode of implementation in such a form. In addition, the explanations in the following sentences and how to draw drawings are only examples of the scope of the present invention, and various shapes and sizes are possible within the range where the effects of the present invention can be exhibited. , size and material can be changed as appropriate.

In order to facilitate the understanding of the invention, the arrangement and dimensional relationships among the constituent elements in the drawings, the presence or absence of gaps, etc. are exaggerated to some extent, and the dimensional relationships differ from the actual ones. Therefore, when applying the denture and its mounting attachment according to the present invention to actual dental care, the present invention can be applied in various situations while changing the preferred form according to the wearing position and wearing site for each denture wearer and the number of artificial teeth. It should be noted in advance that such various variations are included in the scope of the present invention, as it is natural to make appropriate changes in accordance with the actual dental treatment that is conceivable. In the drawings, cross-sectional hatching is omitted as appropriate to facilitate understanding of the description.

FIG. 1 is a side view showing the structure of a denture and its attachment according to an embodiment of the present invention in a partial cross-section along the longitudinal direction of the denture, showing a state in which a denture wearer wears the denture on the abutment tooth. showing. Moreover, FIG. 2 is a top view which shows the structure of the denture and its mounting attachment which concerns on embodiment of this invention along the longitudinal direction of a denture with a partial cross section. FIG. 3 is a diagram corresponding to FIG. 1, and shows a state immediately before the denture wearer attaches the denture to the abutment tooth and immediately after removing the denture from the abutment tooth. FIG. 4 is a diagram corresponding to FIG. 1, and shows a state in which the denture wearer starts occlusion after fitting the denture to the abutment tooth, and the denture base of the denture has sunk to some extent into the mucous membrane. there is FIG. 5 is a diagram corresponding to FIG. 1, and shows a state in which the denture wearer fully occlusion after attaching the denture to the abutment tooth, and the denture base of the denture completely sinks into the mucous membrane and stops sinking. showing.

The denture and its mounting attachment 1 according to this embodiment have at least two artificial teeth 111, 112, 113, . - A denture 100 having an elongated denture base 120 with (110) fixed to the top, and an attachment for attaching the denture 100 to an abutment tooth 200 that serves as a so-called abutment tooth, and the magnetism of the magnet 150 It is a denture and its mounting attachment that can be attached to the abutment tooth 200 by a tensile force.

The abutment tooth 200 includes a stump 20, a keeper holder 210 fixed to the upper part of the stump 20, and a keeper composed of a magnetic member arranged on the upper surface of the keeper holder 210 in an optimal state (optimal position and posture). 250 is provided. A keeper 250 fixed to the top surface 22 of the root stump 20 via a keeper holder 210 can be tightly coupled to each other by a magnetic pulling force of a magnet 150 provided on the denture 100, which will be described later.

The keeper holder 210 is attached to the upper surface 22 of the stump 20 and holds the keeper 250 in a fixed state. When planted in a root canal 25 formed from the upper surface 22 of the stump 20 toward the lower end 21, the holder fixing leg 215 has a predetermined length.

The keeper 250 is made of a magnetic material suitable for use as a denture, as described above, and has a disk shape with a certain thickness. A portion of the lower side of the keeper 250 in the thickness direction fits into the recess 212 of the holder body 211 of the keeper holder 210 and is fixed to the keeper holder 210 with an appropriate adhesive.

In this embodiment, since the keeper holder 210 itself is also fixed to the upper surface portion 22 of the root stump 20 , the keeper 250 also attaches the denture 100 to the upper surface portion 22 of the stump 20 with the disc-shaped upper plane. It is fixed so as to be substantially perpendicular to the occlusal direction in the closed state. The optimal adjustment method for making this direction perpendicular to the occlusal direction when the denture 100 is worn will be described later in detail.

The denture 100 has at least two artificial teeth 111, 112, 113, . .

Further, the denture 100 is provided on the upper part of the denture base 120 as artificial teeth 111, 112, 113, . there is In the present invention, the type, number, and arrangement of premolars, molars, and the like provided on the denture base 120 can be combined in various ways within the range in which the effects of the present invention can be exhibited, and the denture 100 is attached. It can be selected as appropriate according to the site and the condition of the missing tooth around the stump 20 .

A bottomed housing accommodation recess 130 is formed at a predetermined position in the longitudinal direction on the bottom side of the denture base 120 that contacts the mucous membrane 30 . The recessed portion 130 for inserting and holding the magnet 150 has a magnet housing space for housing the magnet 150 movably in a predetermined direction, and the portion of the abutment tooth 200 protruding from the mucous membrane 30 is inserted into the housing housing recess 130 . A magnet containment housing 160 is provided to allow for A magnet 150 is movably housed inside the magnet housing 160 .

The housing accommodating recess 130 has one circular opening at a predetermined position on the bottom surface of the denture base 120, and the artificial tooth 111 is inserted in the denture base 120 in a direction substantially perpendicular to the opening surface of this opening. , 112, 113, . Although the bottom portion is provided inside the denture base 120 in this embodiment, it may be formed separately from the outside of the denture 100, and the artificial teeth 111, 112, 113, . ) may be formed in an arrangement state reaching the base end portion of .

The magnet containing housing 160 has a substantially cylindrical tubular shape, and a disk-shaped magnet 150 contained in the magnet containing housing 160 is movable along the axial direction of the magnet containing housing 160 inside the magnet containing housing 160 . It has a structure in which one surface of the magnet 150 can be directly brought into close contact with the upper surface 251 of the keeper 250 by a magnetic pulling force without falling out of the containing housing 160 .

In this embodiment, the magnet containing housing 160 is composed of a cylindrical body 161 made of non-magnetic stainless steel with openings at both ends, and one end of the cylindrical body 161 with a It consists of an inwardly directed flange 162 that is bent inwardly over the entire length thereof, and a lid cover 163 made of a plastic plate that covers the other end of the cylindrical body. Also, the disk-shaped magnet 150 is housed inside the magnet housing 160 before the cylindrical body 161 is covered with a lid cover 163 made of a plastic plate.

Then, the magnet containing housing 160 is attached to the housing containing recess 130 of the denture base 120 with respect to the bottom surface of the housing containing recess 130 (in FIGS. 1 and 4 to 6, shown as the upper surface on the artificial tooth side). A housing accommodating recess 130 formed at the bottom of the denture base 120 with a lid cover 163, which is the other end of the cylindrical body, abutting and an inward flange 162, which is one end of the cylindrical body of the magnet housing 160. The magnet housing 160 is attached to the housing housing recess 130 with an adhesive between the outer peripheral surface of the magnet housing 160 and the inner peripheral surface of the housing housing recess 130 so that the magnet housing 160 and the housing housing recess 130 are substantially flush with each other. It is stored securely in the

An inward flange 162 forming a part of the magnet containing housing 160 is exposed from the bottom surface of the denture base 120, and when the denture 100 is attached to the abutment tooth 200, the magnet 150, which will be described later, falls off the magnet containing housing 160. play a role in preventing

The portion surrounded by the inward flange 162 of the magnet containing housing 160 brings the keeper 250 into direct contact with the magnet 150 by a magnetic pulling force when the denture 100 is attached to the abutment tooth 200, and also holds the denture 100 as the abutment. At least a part of the surface of the keeper 250 in the thickness direction that is in contact with the magnet 150 when the keeper 250 is attached to the tooth 200 and engaged with the magnet 150 is formed as a keeper insertion hole 165 that can enter the inside of the magnet containing housing 160 .

In this embodiment, as shown in the drawings, the keeper 250 fits into the recessed portion 212 of the keeper holder 210 having an ashtray, and the upper surface 251 of the keeper 250 forms the recessed portion 212 of the keeper holder 210. It is substantially flush with the upper portion of the surrounding upright portion 213 . Therefore, in this embodiment, the size of the keeper insertion hole 165 of the magnet containing housing 160 is set within the magnet containing housing 160 including not only the keeper 250 but also the surrounding upright portion 213 of the keeper holder 210 coupled with the keeper 250 . It is large enough to enter.

When the denture 100 is attached to the abutment tooth 200 , the magnet 150 in the magnet housing 160 is attached to the side of the denture 100 that is in close contact with the mucous membrane 30 of the denture base 120 and the artificial tooth 111 positioned above the magnet housing 160 . , 112, 113, .

The magnet 150 has a disk shape and extends between a lid cover 163 and an inward flange 162 in the magnet housing 160 along the central axis of the cylindrical body of the magnet housing 160 in the thickness direction of the magnet 150 (centering on the magnet 150). axial direction). In this embodiment, the outer diameter of the magnet 150 is slightly smaller than the inner diameter of the cylindrical body of the magnet containing housing 160, and is dimensioned so as not to hinder the free movement of the magnet 150 within the magnet containing housing 160. It is decided.

The magnetic poles of the disk-shaped magnet 150 are divided into two parts in the thickness direction of the magnet 150. For example, one half of the magnet 150 in the thickness direction and facing the lid cover 163 of the magnet containing housing 160 is divided into two parts. In the case of the N pole, the other half of the magnet 150 in the thickness direction and facing the inward flange 162 side of the magnet containing housing 160 is the S pole. Alternatively, if one half of the magnet 150 in the thickness direction and facing the lid cover 163 of the magnet containing housing 160 is the S pole, the other half of the magnet 150 in the thickness direction is the magnet. The portion facing the inward flange 162 side of the accommodation housing 160 is an N pole.

Next, the positional relationship and dimensional relationship of each component of the denture 100 and its mounting attachment 1 according to the present embodiment described above, the magnitude of the magnetic pulling force of the magnet 150, and the like will be described.

The keeper insertion hole 165 of the magnet containing housing 160 is exposed at the bottom surface of the denture base 120 of the denture 100 so as to be substantially flush with the bottom surface of the denture base 120 as described above. By bringing the exposed keeper insertion hole 165 of the magnet containing housing 160 close to the keeper 250, the magnet 150 and the keeper 250 are closely fixed by the action of the magnetic pulling force of the magnet 150, and the denture 100 is correctly attached to the abutment tooth 200. The arrangement configuration is such that the denture 100 is attached to the abutment tooth 200 while being guided to the position.

Further, the magnetic pulling force of the magnet 150 is obtained by moving the keeper insertion hole 165 of the magnet containing housing 160 closer to the keeper 250 as described above, so that the magnet 150 and the keeper 250 are tightly fixed by the action of the magnetic pulling force of the magnet 150. Above, in the mounting state of both of these, that is, the mounting state of the denture 100 to the abutment tooth 200, the entire bottom surface of the denture base 120 of the denture 100 is in close contact with the saliva layer 90. A magnetic pulling force is generated that is large enough to keep the denture 100 attached to the abutment tooth 200 .

In the drawings showing this embodiment, the state in which the denture 100 is attached to the abutment tooth 200 of the lower jawbone 60 is depicted. It goes without saying that the magnet 150 is adapted to generate a magnetic pulling force sufficient to sufficiently exhibit the above-described effects even when the magnet 150 is attached.

A more detailed description will now be given of how the magnet 150 moves within the magnet containing housing 160 after the denture 100 is attached to the abutment tooth 200 . Specifically, when the denture 100 is attached to the abutment tooth 200 and then occlusion, the occlusion force subsides the entire bottom surface of the denture base 120 of the denture 100 to the mucous membrane 30, and the keeper 250 magnetically pulls the magnet 150. A portion of the magnet 150 coupled with the keeper 250 and a surrounding portion of the keeper holder 210 enter the magnet accommodating housing 160 through the keeper insertion hole 165 . With this movement, the magnet 150 in the magnet containing housing 160 moves toward the artificial teeth 111, 112, 113, . . . . In the subsidence state of the denture base 120, the saliva of the saliva layer 90 intervening between the denture base 120 and the mucous membrane 30 is pushed out of the denture base 120 as shown in the changes in FIGS. ing.

As the compressive repulsive force applied from the mucous membrane 30 to the denture base 120 subsiding on the mucous membrane 30 increases according to the degree of occlusion, the magnet 150 moves through the magnet containing housing 160 to the artificial teeth 111, 112, 113, . . . is further moved to the (110) side.

Furthermore, even when the occlusal force is maximized and the compressive repulsive force received by the denture base 120 of the denture 100 from the entire mucous membrane 30 in close contact with the denture base 100 is balanced and the sinking motion of the denture base 120 to the mucous membrane 30 is stopped, the magnets A constant space (see space 170 in FIG. 6) is ensured between 150 and the portion of the artificial teeth 111, 112, 113, . . . The outer shape of the magnet containing housing 160 and the shape and volume of the internal space are defined as follows.

Subsequently, the procedure for attaching the denture 100 to the abutment tooth 200 by the denture and its attachment 1 according to the present embodiment, the explanation of the process related to occlusion after attachment, and the removal of the denture 100 from the abutment tooth 200 are shown in the drawings. will be described in detail in accordance with the order of steps. In this description, a state in which the denture 100 is attached to the abutment tooth 200 of the lower jawbone 60 is depicted, but conversely, the denture 100 is attached to the abutment tooth 200 of the upper jawbone 60. Even if there is, it will be the same operation and effect just by turning it upside down.

In advance, the dental clinic selects and removes a natural tooth which is a natural tooth for forming the abutment tooth 200 and whose crown portion needs to be removed due to the progress of caries, and then the upper surface portion of the stump 20 is removed. 22, a fixing hole for the keeper holder 210 is drilled. Then, by fitting the keeper 250 into the recessed portion 212 on the upper surface of the keeper holder 210 and fixing it, the abutment tooth 200 applicable to the present invention is formed at a dental clinic. This process can be better understood from what is shown in FIG. That is, FIG. 7 is a cross-sectional view (FIG. 7(a)) showing a state in which caries has progressed in the crown inside the crown while the metal crown is still covered, and a state in which the metal crown and the crown are removed from the state of FIG. FIG. 7B is a cross-sectional view showing the removed state, and FIG. 7C is a cross-sectional view showing the state in which a root canal is formed from the surface of the tooth root.

Similarly, the denture 100 applicable to the present invention having the magnet containing housing 160 containing the magnet 150 described above in the denture base 120 is manufactured at a dental clinic and prepared. Then, the denture wearer picks up the denture 100 with fingers and brings the denture 100 closer to the abutment tooth 200 . Note that FIG. 3 shows a state immediately before the denture wearer mounts the denture 100 on the abutment tooth 200 .

At this time, by bringing the keeper insertion hole 165 of the magnet containing housing 160 exposed from the bottom surface of the denture base 120 closer to the keeper 250 , the magnet 150 and the keeper 250 are tightly fixed by the action of the magnetic pulling force of the magnet 150 , and the denture 100 is attached. It is possible to attach the denture 100 to the abutment tooth 200 while guiding it to the correct attachment position with respect to the abutment tooth 200 . That is, the denture wearer can accurately provisionally position the denture 100 on the abutment tooth 200 by utilizing the magnetic pulling force of the magnet 150 . In addition, FIG. 1 shows a state in which the denture wearer has attached the denture 100 to the abutment tooth 200 as described above.

By temporarily positioning the denture 100 on the abutment tooth 200 and simultaneously pressing the entire denture lightly against the mucous membrane 30 with fingers, the air intervening between the bottom surface of the denture base 120 and the surface of the mucous membrane 30 in contact with the bottom surface of the denture base 120 is released into this gap. , and the two come into tight contact with each other through the saliva layer 90 . In this way, the magnetic pulling force of the magnet 150 of the denture 100 with respect to the abutment tooth 200 and the entire bottom surface of the denture base 120 and the entire surface of the mucous membrane 30 acting in the same direction as this pulling force act on the saliva layer 90 . It is possible to firmly attach the denture 100 to the abutment tooth 200 by the adhesion force through the denture.

When the denture 100 is attached to the abutment tooth 200 of the upper jawbone 60, as the denture 100 approaches the abutment tooth 200, the magnet 150 in the magnet containing housing 160 approaches the keeper 250 from the lower side of the housing. The magnetic pulling force acting on the keeper 250 gradually increases, and the magnet 150 moves toward the upper jaw so that the magnet 150 contacts the inward flange 162 forming the keeper insertion hole 165. Similar to operation and action.

Subsequently, the process of occlusion will be described based on the drawings according to the magnitude of the occlusion force. 4 and 5, in which artificial teeth 111, 112, 113, . . . An arrow F directed from top to bottom represents a simplified bite force acting on each artificial tooth 111, 112, 113, . It is. The length of this arrow F indicates the magnitude of the occlusal force acting on each of the artificial teeth 111, 112, 113, . . . (110).

FIG. 4 shows a state in which the denture wearer attaches the denture 100 to the abutment tooth 200, starts occlusion, and the denture base 120 of the denture 100 sinks to the mucous membrane 30 to some extent. According to the figure, each arrow F has a uniform length, indicating that the occlusal forces are acting equally on the artificial teeth 111, 112, 113, . . . (110).

In this case, as can be seen by comparison with FIG. 1, the entire denture base 120 of the denture 100 is evenly pressed against the mucous membrane 30 by the occlusal force, and the mucous membrane 30 is evenly crushed, resulting in a gap between the denture base 120 and the mucous membrane 30. It can be understood that the entire denture 100 is evenly sunk against the mucous membrane 30 by pushing out the saliva layer 90 intervening in the denture. That is, in this state, the entire denture base 120 of the denture 100 crushes the mucous membrane 30, so that the reaction force received from the crushed mucous membrane 30 as a whole balances the occlusal force.

As can be seen by comparing FIG. 4 with FIG. 1, as the occlusal force sinks the entire bottom surface of the denture base 120 of the denture 100 to the mucous membrane 30, it is coupled to the keeper 250 by the magnetic pulling force of the magnet 150. The connecting portion of the magnet 150 with the keeper 250 and the surrounding standing portion 213 of the keeper holder 210 enter the magnet housing 160 through the keeper insertion hole 165 . With this movement, the magnet 150 in the magnet containing housing 160 moves toward the artificial teeth 111, 112, 113, . . .

As the degree of occlusion increases, the compressive repulsive force applied from the mucous membrane 30 to the denture base 120 sinking on the mucous membrane 30 increases. Accordingly, the magnet 150 , the keeper 250 in close contact with the magnet 150 , and the peripheral standing portion 213 of the keeper holder 210 located in the vicinity of the portion of the keeper 250 in close contact with the magnet 150 move inside the magnet containing housing 160 to the artificial tooth 111 of the denture 100 . , 112, 113, .

Subsequently, when the degree of occlusion of the denture wearer becomes maximum, the state shown in FIG. 4 changes to the state shown in FIG. In addition, FIG. 5 shows a state in which the denture wearer attaches the denture 100 to the abutment tooth 200 and then occlusion, and the denture base 120 of the denture 100 completely sinks into the mucous membrane 30 and stops sinking.

In the state shown in FIG. 5, the occlusal force is maximized, and the denture base 120 of the denture 100 is balanced with the compressive repulsive force received from the entire mucous membrane 30 in close contact with the denture base 100, causing the denture base 120 to sink further into the mucous membrane 30. It is in a stopped state. That is, in this state, the magnet 150 no longer moves toward the lid cover 163 inside the magnet containing housing 160 .

In this state, as can be seen from FIG. 6, as a feature of the present invention, the magnet 150 and the artificial teeth 111, 112, 113, . . . A constant space 170 remains between them.

That is, even when the occlusal force is maximized and the compressive repulsive force received by the denture base 120 of the denture 100 from the entire mucous membrane 30 in close contact with the denture base 100 is balanced and the sinking motion of the denture base 120 to the mucous membrane 30 is stopped, the magnet 150 and the portion of the magnet containing housing 160 facing the magnet 150 on the side of the artificial teeth 111, 112, 113, . . . It is a feature of the invention.

The technique for leaving this space 170 will be described below. The bite force is typically about 3 MPa to about 9 MPa (average 30-90 kg/cm ² (300-900 tons/m ² )) and is quite large. In addition to this, the number of times of chewing per mouthful is usually about 20 to 30 times, and about 30 mouthfuls of food are chewed at one meal. In other words, the number of chewing times for one meal is 20×30=600 times, 600×3=1800 times for three meals a day, and about 2000 times if other snacks are added.

As a result, the number of times of mastication in one month is 2000×30 days=60000 times, and in six months, 60000 times×6 months=360000 times.

In other words, a bite force of about 3 MPa to about 9 MPa (average 30 kg to 90 kg per 1 cm ² (300 tons to 900 tons per 1 m ² )) acts on the abutment teeth in each of the extremely large number of chewing motions described above. become.

In recent years, when people are said to be in the age of 100 years of life, for example, when they wear dentures in their 60s or 70s, there is no option to replace the extracted teeth with implants, which costs a lot per tooth. , will continue to use dentures for nearly 30 years to 30 years or more. In addition, there are cases in which implants cannot be implanted due to various factors such as the size and shape of the jawbone, the arrangement of nerves in the jawbone, and dentures must be used continuously.

Here, denture wearers who extract natural teeth and wear dentures instead are generally old as described above. Also, the abutment teeth that support the dentures are not in a completely healthy state, and it is fully conceivable that the periodontal ligament 40, which is an important fibrous tissue connecting the tooth root and the jawbone, has deteriorated to some extent. In such a case, the following problems occur if the occlusal motion is performed countless times with a large occlusal force without wearing the denture according to the present invention for at least three meals a day or between meals.

For example, as disclosed in the literature (Japanese Patent Laid-Open No. 2011-224109) cited as a conventional technique, in order to completely fix a denture to a stump that constitutes a part of an abutment tooth as an abutment tooth, When the engagement fixing part is provided on the axis of the abutment tooth, the occlusal force acts directly on the periodontal ligament under the abutment tooth, resulting in damage to the remaining limited periodontal ligament of the abutment tooth. , causing the abutment tooth itself to oscillate and fail to function as an abutment tooth for fixing the denture. In addition to this, eventually the abutment tooth itself did not function as a natural tooth and was either extracted along with the root and replaced with an implant or the like, or the remaining abutment tooth was used to include this part after the extraction. Extremely troublesome post-treatment, such as remaking dentures, is required.

On the other hand, according to the present invention, when the occlusal action is started, not only the residual root that constitutes a part of the abutment tooth as an abutment tooth, but also the extremely important role of fulfilling the role as the abutment tooth It is possible to prevent such a large occlusal force from being applied as an impact force to the periodontal ligament that fulfills the function, that is, the periodontal ligament that connects the stump and the jawbone.

In addition, as is clear from the structure of the present invention, since the occlusal force is not directly applied to the magnets or the keeper, even if the denture is used for a long period of time, the loss of the original function of the denture due to the breakage of the magnets or the keeper can be avoided. It is possible to prevent these broken fragments from remaining in the oral cavity and accidentally swallowing the broken part of these magnets and keepers.

Furthermore, when occlusion is always accompanied by a mortar-grinding motion in order to reliably grind food, the angle of action of the occlusal force due to this mortar-grinding motion changes from a vertical direction to an oblique direction. There is a force that shifts the lateral direction (direction perpendicular to the occlusion direction) and a moment that causes it to fall down. In the structure in which the denture and the magnet are integrated as in the prior art, these forces and moments are directly applied to the magnet fixed integrally with the denture due to this mortar-grinding movement, resulting in a gap between the magnet and the keeper. Or local wear of both occurs.

Even in such a case, the section modulus changes due to the change in the shape of the magnet or keeper, and there is a risk that cracks will occur in this portion even by normal bite force, eventually breaking the magnet or keeper. As with the above, there is a concern that the broken fragments of the magnet and the keeper may remain in the oral cavity, and part of the broken magnet and the keeper may be mistakenly ingested due to the structure of the prior art. be. However, according to the structure of the present invention, it is possible to continue using the denture for a long period of time without the above-mentioned inconveniences.

Furthermore, according to the structure of the prior art as described above, the force acting on the abutment tooth of the denture in the lateral direction (the direction perpendicular to the occlusal direction) or the moment of tilting the denture base causes the denture base to move. The rim portion locally impinges on the gingiva around the abutment portion and exerts a shearing force that delaminates the gingiva. As a result, this part of the gingiva is locally inflamed, and there is a great possibility that the denture wearer will be unable to continue wearing the denture because of the pain.

On the other hand, according to the structure of the present invention, even if the denture wearer bites the denture 100 with all one's might, the upper surface of the magnet 150 firmly adhered to the keeper 250 by the magnetic pulling force is the bottom surface of the magnet containing housing 160 on the side of the artificial teeth. In other words, there is no contact with the lid cover 163 placed on the artificial tooth side of the magnet containing housing 160, and a certain amount of gap (space) 170 always remains.

As a result, even if the denture wearer occlusion firmly, the occlusion force at this time will not be applied to the magnet, and the magnet can be prevented from being damaged. As a result, the magnitude of the magnetic pulling force exerted on the keeper 50 by the magnet 150 can be kept constant for a long period of time, and the presence or absence of magnet breakage can be prevented without impairing the firm wearing feeling of the denture. It is possible to avoid unnecessary maintenance of the denture, which requires visiting a dental clinic for confirmation and repair when the magnet is damaged, and cost and time loss associated therewith.

Owing to the structural features peculiar to the present invention as described above, once the denture and its mounting attachment according to the present invention are worn, it is possible to maintain the wearing state for a long period of time, and frequent visits to the dental clinic for maintenance are possible. There is no need to go to the hospital, and the denture and its mounting attachments can be destroyed to avoid serious problems such as refitting new dentures and their mounting attachments.

As a result, once the denture and its mounting attachment according to the present invention are worn, it is possible to maintain the wearing state for a long period of time, and there is no need to frequently visit the dental clinic for maintenance. can be prevented from breaking and causing serious problems such as refitting new dentures and their attachments.

In addition, since food can be sufficiently masticated in the mouth without exerting excessive force on the abutment teeth, the burden on digestive organs such as the stomach and intestines can be reduced, and nutrition can be obtained from food. It can be fully absorbed, helping to maintain the health of the elderly and improving the quality of life.

In addition, according to the present invention, during occlusion, the denture base can be pressed against the mucosa and fully chewed without being overly sensitive about damaging the valuable stump and surrounding periodontal ligament. It also has the following effects due to being able to do it.

Specifically, when chewing food, it is necessary to move the masseter muscle and chew with sufficient bite force. Here, by attaching the denture according to the present invention to the abutment teeth, the habit of firmly using the pterygoid muscle, which is a part of the muscle of mastication, is acquired in order to generate sufficient bite force during daily meals. Attach. This pterygoid muscle promotes blood circulation in the pterygoid venous plexus, resulting in an improvement in the masticatory system as a whole, thus ensuring an adequate supply of blood from the heart to the brain and surrounding organs of mastication. It exerts a secondary effect.

In this way, blood can be supplied from the artery of the heart to the brain and peripheral sensory organs during occlusion, which contributes to the prevention and inhibition of the progression of dementia, which has become a recent problem.

Furthermore, for example, if a general denture fixed with a clasp is used for a long period of time, the clasp part will be plastically deformed and eventually fatigue fractured. These may be damaged, and fragments of the clasp may be swallowed together with food, resulting in accidental ingestion.

However, when the denture and its attachment according to the present invention are used, such complicated movements of the denture associated with occlusion do not have a mechanical effect on the abutment tooth, and the abutment tooth itself maintains its role. The dentures themselves can be used for a long period of time without being damaged.

In addition, since the entire denture is attached to the abutment tooth without using a clasp, a metal member such as the clasp is not exposed to the outside. As a result, when the mouth is opened, the metal part of the clasp is not visible from the outside, and it is completely impossible to see that the denture is worn. It can be said that there are In addition, from this point of view, the denture wearer can go out and enjoy conversations with friends and acquaintances without worrying about it, and if a question arises while shopping or attending a lecture, etc., the other person can ask a question. It is possible to listen without hesitation in a sufficiently audible voice.

Next, a specific procedure for configuring the abutment tooth 200 according to the present invention will be described. In this explanation, one example is given as an illustration, but even in other states of natural teeth, stump 20 and periodontal ligament 40 form the foundation of abutment tooth 200 in a firm state. The present invention can be applied to any form if possible.

In the following explanation, since caries had occurred in the crown, it was treated and a metal crown was placed on the crown, but after a long period of time, the caries in the crown inside the metal crown could not be treated Description is based on the case where newly developed caries erodes (caries) the enamel of the crown and erodes the entire dentin of the crown. In other words, the crown cannot fulfill its role as the base on which the metal crown is placed. Assume that the situation is

Fig. 7 is a cross-sectional view showing a state in which caries has progressed in the crown inside the crown with the metal crown covered (Fig. 7(a)), and the state of Fig. 7(a) with the metal crown and the crown removed. Fig. 7(b) is a cross-sectional view showing a state, and Fig. 7(c) is a cross-sectional view showing a state in which a root canal is formed from the surface of a tooth root.

In the present invention, when the state shown in FIG. 7(a) is reached, the dentist removes the metal crown and removes the entire crown at the dental clinic, thereby forming a flat portion on the upper portion of the stump 20. (See FIG. 7(b)), a root canal 25 as a hole for holding a keeper is formed to a certain depth from approximately the center position of the upper surface of the tooth crown toward the tip of the root (see FIG. 7(c)). . Then, a wax 209 is poured into this portion for molding the keeper holder 210 (see FIG. 8A), and a keeper mounting handling pin 255 erected from the central portion of the disk-shaped keeper 250 is held by the surveyor 80. While doing so, the upper surface 251 of the keeper 250, that is, the contact surface with the magnet 150 after wearing the denture, is adjusted so that it is substantially perpendicular to (coincides with) the occlusal direction of the portion forming the abutment tooth 200 of the denture wearer (Fig. 8(a) to FIG. 8(b)).

Then, the hardened wax 209 in this state is molded (see FIG. 8C), and a metal keeper holder 210 is formed by casting by a so-called lost wax method. Then, the keeper holder 210 is ground and firmly attached to the root stump 20 with an adhesive resin cement or the like (see the process from FIG. 9(a) to FIG. 9(b)). In accordance with this, the keeper attachment handling pin 255 of the keeper 250 is cut off leaving a certain length to form a housing position/posture adjustment pin 256, and the keeper 250 is inserted into the recess 212 on the upper surface of the keeper holder 210. With the housing mounting position/orientation adjusting pin 256 projecting through an adhesive resin cement or the like, they are firmly brought into close contact and fixed (see FIG. 9(c)). This completes the preparation for the configuration of the abutment tooth 200 side in the present invention.

Subsequently, adjustment work is performed so that the denture 100 having the magnet containing housing 160 can be mounted on the abutment tooth 200 while maintaining an optimum positional relationship that differs for each denture wearer. In this adjustment work, a positioning adjustment disc 350 (see FIGS. 10(c) and 10(d)) unique to the present invention is used.

The positioning adjustment disk 350 has an optimum relative position/posture relationship with respect to the keeper 250 and the keeper holder 210 fixed to the abutment tooth 200 by the magnet containing housing 160 when the denture 100 is attached to the abutment tooth 200. As a result, the keeper 250 and the surrounding upright portion 213 of the keeper holder 210 holding the keeper 250 can easily enter the magnet housing 160 through the keeper insertion hole 165 at the start of occlusion, and the denture wearer can fully occlusion. A disk-shaped adjuster used to leave a constant gap (space) 170 between the top surface of the magnet 150 housed in the magnet housing 160 and the bottom surface of the magnet housing 160 on the artificial tooth side even when is.

From such a role, the thickness of the positioning adjustment disk 350 should be larger than the depth at which the denture base 120 sinks when the denture 100 is attached to the abutment tooth 200 and then fully occlusion. It has a sufficient thickness.

More specifically, the positioning adjustment disc 350 is made entirely of resin, and has a thickness to fulfill the above-described role, an outer diameter that can be accommodated in the magnet accommodation housing 160, and a keeper insertion hole. It has an outer diameter that does not fall off from 165. Furthermore, in the center of the positioning adjustment disk 350 in the axial direction, there is provided a disk temporary attachment through hole into which a housing attachment position/posture adjustment pin 256 projecting upward from the keeper 250 in a partially remaining state after cutting can be inserted. 356 along the central axis of the positioning disc 350 .

Subsequently, the shape and size of the oral cavity of each denture wearer using the above-described positioning adjustment disk 350 unique to the present invention, the formation state of the jawbone, and the thickness and size of the abutment tooth 200 are adjusted. A method of making a custom denture 100 that provides optimum chewing comfort is further described.

In FIG. 10, the lid cover of the magnet containing housing containing the magnet is removed, the magnet is temporarily removed, the positioning adjustment disk is inserted into the magnet containing housing, the magnet is contained, and the lid cover is put on the housing body. 10(a) to 10(d) are cross-sectional views showing steps of assembling the magnet containing housing again; FIG.

First, the lid cover 163 of the magnet containing housing 160 is removed (see FIG. 10(a)), the positioning adjustment disk 350 is inserted toward the inward flange 162, and subsequently the magnet 150 is inserted into the positioning adjustment circle. It is inserted into the magnet containing housing 160 so as to overlap the plate 350, and the lid cover 163 is again placed over the opening of the main body of the magnet containing housing 160 (see FIG. 10(c)). is tightly fixed to the housing body (see FIG. 10(d)). In this state, the upper surface of magnet 150 and lid cover 163 are in contact with each other.

Next, the housing mounting position/posture adjustment pin 256 left on the upper surface 251 of the keeper 250 for a certain length after cutting is inserted into the disk provisional disk 350 of the positioning adjustment disk 350 that appears approximately at the center of the keeper insertion hole 165 . The magnet containing housing 160 is placed on the keeper 250 while inserting the mounting through hole 356 (see FIG. 10(c)). Then, it protrudes to some extent from the upper surface 251 of the keeper 250 of the abutment tooth 200 into the through-hole 356 for disc temporary mounting of the positioning adjustment disc 350 appearing at the center of the keeper insertion hole 165 of the magnet containing housing 160 . The state where the magnet containing housing 160 is placed on the upper surface 251 of the keeper 250 is maintained so that the housing mounting position/orientation adjusting pin 256 after cutting is inserted.

In this state, in this embodiment, the upper surface of the magnet 150 and the lid cover 163 are in contact with each other as described above. It is important to understand the effects of the present invention that the positioning adjustment disk 350 is actually removed (see FIG. 13(b)). In other words, the thickness of the positioning adjustment disk 350 is greater than the depth at which the denture base 120 sinks into the mucous membrane 30 when the denture wearer occlusion as described above.

Therefore, when the denture 100 is actually attached to the abutment tooth 200 after the denture 100 is completed, the magnet 150 contacts the inward flange 162 of the magnet containing housing 160 while being in close contact with the keeper 250 facing the magnet 150 . (see FIG. 13(b)). In this state, when the denture wearer bites the denture 100 with all one's might, the denture base 120 of the denture 100 sinks into the mucous membrane 30 to the maximum depth, and is joined to the jawbone 60 via the periodontal ligament 40. The upper surface 251 of the keeper 250 fixed to the top of the stump 20 through the keeper holder 210 enters the magnet housing 160 through the keeper insertion hole 165 of the magnet housing 160 .

However, even in such a state, the upper surface of the magnet 150, which is firmly attached to the keeper 250 by the magnetic pulling force, is the bottom surface of the magnet containing housing 160 on the side of the artificial tooth, that is, the cover covering the artificial tooth side of the magnet containing housing 160. It is a feature of the present invention that a certain amount of gap (space) 170 always remains without contacting 163 . In this way, the process proceeds to the preparatory stage of the manufacturing process for the abutment tooth 200 according to the present invention.

Preparations for the fabrication process on the denture side then begin. FIG. 12 shows the state shown in FIG. Figure 12(a) showing the state of being attached to the keeper of the abutment tooth corresponding to the state of Fig. 11(d), and the denture according to the present invention to the abutment tooth from the state of Fig. 12(a). 12B), and in the state shown in FIG. FIG. 12C is a diagram showing a state in which the housing mounting position/orientation adjusting pin projecting from the upper part of the keeper is removed and the upper surface of the keeper is polished.

Specifically, following the above-described state, a plurality of artificial teeth 111, 112, 113, . • Prepare a wax denture corresponding to the denture base 120 with (110). Then, the wax denture is pressed against the abutment tooth 200 side, and the denture 100 is polymerized and polished according to the usual method to produce a completed denture.

FIG. 12(a) shows a state in which the completed denture 100 is attached to the abutment tooth, and the hatched portion of the denture base 120 turns into wax and covers the circumference of the magnet housing 160. This step corresponds to the form in which the

Then, the magnet containing housing 160 is removed from the abutment tooth 200 side, and the positioning adjustment disc 350 is pulverized using the keeper insertion hole 165 of the housing body and then removed from the magnet containing housing 160 (FIG. 12(c)). reference). As a result, only the magnet 150 returns to the state in which it is accommodated in the magnet accommodation housing 160 again in the normal orientation and posture.

12, in the actual process, the magnet containing housing 160 containing only the magnet 150 is inserted into the housing containing recess 130 formed in the waxed denture using an adhesive resin cement or the like, and does not fall off. You can combine the two as follows:

In accordance with the above work, the magnet containing housing 160 placed on the keeper 250 is removed from the keeper 250, and the remaining part of the housing mounting position/posture adjusting pin 256 after cutting protrudes from the upper surface 251 of the keeper 250 to some extent. is cut, the proximal end is roughly ground, and when the denture 100 is attached to the abutment tooth 200, the upper surface 251 of the keeper 250 is exposed from the keeper insertion hole 165 of the denture 100 and the magnet 150 exposed from the magnetic pulling force. The upper surface of the keeper 250 is finished by polishing so that the two are firmly adhered to each other by surface contact with each other (see FIG. 12(c)).

Then, in a state in which the denture 100 is brought close to the keeper 250 and the denture 100 is temporarily joined to the abutment tooth 200 by the magnetic pulling force of the magnet 150, whether or not the denture 100 is correctly joined to the abutment tooth 200 is determined. It is confirmed whether the wearer can firmly bite the denture 100 while sinking the abutment tooth 200 sufficiently.

FIG. 13 is a view (FIG. 13(a)) just before the denture according to the present invention completed in FIG. Fig. 13(b) shows a state in which the denture according to the present invention is attached to the abutment tooth using the magnetic pulling force of the magnet (Fig. 13(b)), and subsequently, the denture according to the present invention is pulled from the abutment tooth to the magnet. It is a figure (FIG.13(b)) which shows the state which resisted magnetic pulling force and was removed.

Only the magnet 150 described above is placed in the housing space of the denture base 120 having a predetermined number of artificial teeth 111, 112, 113, . . . (110). The built-in magnet containing housing 160 is inserted in a regular direction, and an adhesive resin cement is interposed between them to firmly fix them. Through the above procedure, the denture 100 according to the present invention, in which the inward flange 162 of the magnet housing 160 and the keeper insertion hole 165 are exposed from the predetermined position on the bottom of the denture base 120, is completed.

FIG. 14 is a cross-sectional view (FIG. 14(a)) showing a state in which caries has progressed to one side of the upper part of the tooth root (right side in the figure), and a state in which an appropriate keeper holder and keeper are attached to the root in this state. (Fig. 14(b)), and a sectional view (Fig. 14(c)) of a state in which caries has progressed to the other side of the upper part of the tooth root (left side in the figure), and a suitable keeper holder and keeper in this state is attached to the tooth root (Fig. 14(d)).

When caries has progressed considerably and has eroded (caries) up to the dentin at the top of the tooth root, all the caries must be removed up to this eroded portion. In this way, when caries has progressed considerably, the upper surface 22 of the stump 20 is not substantially parallel to the surface of the mucous membrane 30 as in the drawings described so far, and the upper surface is at a certain oblique angle. The upper part of the root must be removed until the root is removed. Even in such a case, the wax 209 is poured as described above, and the upper surface of the keeper 250 is adjusted while the housing mounting position/orientation adjustment pin 256 erected from the central portion of the disk-shaped keeper 250 is held by the surveyor 80 . 251 is adjusted to be substantially perpendicular to the occlusal direction of the portion forming the abutment tooth 200 of the denture wearer.

Then, using the hardened wax 209 in this state as a mold, a metal keeper holder 210 is produced by casting. Then, the keeper holder 210 is ground and attached to the stump 20, and then firmly fixed to the stump 20 with an adhesive resin cement or the like. As a result, it is possible to attach the keeper 250 to the keeper holder 210 while aligning the magnet adhesion surface of the keeper 250 with the acting direction of the occlusion force.

In the manufacturing process of the denture mentioned above, the content that can be cited as a characteristic point in the present invention will be described. Specifically, it protrudes to some extent from the upper surface 251 of the keeper 250 of the abutment tooth 200 into the disc temporary attachment through hole 356 of the positioning adjustment disc 350 appearing at the center of the keeper insertion hole 165 of the magnet containing housing 160 . The state in which the magnet containing housing 160 is placed on the upper surface 251 of the keeper 250 is maintained so that the housing mounting position/orientation adjusting pin 256 after cutting is inserted. Then, the wax denture corresponding to the denture base 120 provided with a plurality of artificial teeth 110 according to the present invention is pressed against the abutment tooth 200 side, and according to the usual method, the denture 100 is polymerized and polished to produce a completed denture. be.

As a result, when the denture is attached to the abutment tooth, the concentricity of the disk-shaped magnet 150 of the denture and the disk-shaped keeper 250 that is coupled to the magnet 150 by magnetic pulling force is matched. In addition, since the housing mounting position/posture adjusting pin 256 protrudes vertically from the upper surface of the keeper 250, the denture is manufactured in a state in which the contact area is maximized without creating a gap between the overlapping portions of the magnet 150 and the keeper 250. becomes possible. That is, it is possible to manufacture a denture with the greatest attachment force when attached to the abutment tooth 200 . As a result, it is possible to firmly maintain the wearing state not only when the denture is attached to the mandibular abutment tooth, but also when the denture is attached to the maxillary abutment tooth.

In addition to the above, a total of 28 human teeth, consisting of four types of molars, premolars, canines, and incisors, are implanted in the upper and lower jaw bones 60 via the periodontal ligament 40 in the state of natural teeth. It is configured in a state where Therefore, depending on the type of tooth and the position of the tooth, even if only the portion of the crown where the caries has progressed is removed and the upper part of the root is formed into a flat shape for fixing the keeper holder 210, the occlusal direction can be changed. It may be oblique at a certain angle instead of being substantially perpendicular to the direction.

Even in such a case, the keeper holder 210 is cast and the keeper holder 210 is cast in the same manner as in the case where the caries has progressed considerably to erode (caries) the dentin on the upper part of the tooth root. The keeper 250 is placed on the holder 210 so that the bonding surface of the keeper 250 with the magnet 150 on the upper surface faces the direction perpendicular to the occlusal direction. It is possible to manufacture the dental prosthesis and its mounting attachment 1 according to the invention under optimum conditions.

Regarding the size of the denture, that is, the size and shape of the denture, the position of the housing accommodation recess, the housing accommodation recess, the magnet accommodation housing inserted and fixed therein, the diameter and depth of the magnet in the magnet accommodation housing, Since it is impossible for the denture wearer to have exactly the same shape depending on the shape of the jawbone of the denture wearer and the state of the missing tooth portion, it is necessary to examine the denture wearer at the dental clinic and determine the most preferable embodiment.

When such a large occlusal force, which constantly changes in direction and magnitude during occlusion, acts on the clasp portion of a denture that has a conventional clasp, this portion may loosen or break due to metal fatigue. I had a problem.

In addition, when a conventional denture having a clasp on the abutment tooth is worn, the clasp stands out when the mouth is opened, causing an aesthetic problem. Furthermore, long-term use loosens the clasp, making it easier for the denture to come off, and the tongue continues to hold the denture that is about to come off in the mouth. As a result, it was not possible to continue to use it for a long period of time, and this hindered the improvement of quality of life, which is considered important with the advent of the aging society in recent years.

Furthermore, when using conventional dentures with clasps, it is necessary to periodically check for looseness in the clasps and, if looseness is found, restore the clasps to their original state, requiring time-consuming maintenance. was. In addition, when removing and cleaning a denture with a conventional clasp, especially for denture wearers with handicapped fingertips, the denture may be accidentally dropped on the floor and the clasp made of metal may be bent. There was also a fear that the wire might break or break. In such cases, this clasp portion can be repaired to its original condition, or if it is bent or damaged beyond repair, the entire clasp can be replaced with a new one, creating a cumbersome problem. rice field.

The denture cannot be used while the clasp part is being repaired or replaced, which is extremely inconvenient. However, according to the present invention, there is no metal part such as a clasp for fixing and supporting the denture on the outside of the denture. It has a very big advantage that you can continue to use it with peace of mind.

In addition, according to the present invention, since the denture is guided to the optimal mounting position via the magnetic pulling force of the magnet, it becomes very easy to put on and take off the denture, and the elderly can move their fingertips dexterously. A denture wearer who cannot wear a denture can easily attach and detach the denture from the abutment tooth by himself/herself.

It should be noted that each of the above-described embodiments and various modifications thereof merely show exemplary contents of the present invention, and various structures having different shapes, materials, sizes, etc., can be used as long as they are within the scope of the present invention. It goes without saying that it could also be a denture and its mounting attachments.

For example, in the present invention, instead of attaching the keeper to the upper surface of the stump that connects to the jawbone 60 via the periodontal ligament 40, unlike the above-described embodiment, the keeper is placed on the top of the implant 50 directly embedded in the jawbone 60. It may be so arranged that it can be attached to the FIG. 15 is a view corresponding to FIG. 13 showing a state in which an implant 50 is used instead of the stump 20 to construct the abutment tooth of the denture according to the present invention.

In addition, since the configuration other than the implant 50 is the same as that of the above-described embodiment, the corresponding reference numerals are shown in FIG. 15 and the detailed description thereof will be omitted. The same is true when the implant 50 is used as part of the abutment tooth instead of the stump 20 . As a result, the abutment teeth for attaching the dentures of the present invention can be maintained in a healthy state for a long period of time.

In forming the abutment tooth according to the present invention, in addition to the above application modes, for example, when a considerably hard object is bitten, part of the crown is broken and falls off, and the crown is greatly chipped. It can also be applied to a case where it has been put away.

Also, in this embodiment, the keeper fits into the recess of the keeper holder having the ashtray top so that the upper surface of the keeper is substantially flush with the upper portion of the surrounding upright portion forming the recess of the keeper holder. The size of the keeper insertion hole of the magnet containing housing is such that not only the keeper but also the surrounding rising portion of the keeper holder around the keeper can enter the magnet containing housing.

However, instead of this, the thickness of the keeper is greater than the depth of the dented portion of the keeper holder, and the keeper protrudes upward from the dented portion of the keeper holder. If the floor is deeper than the mucous membrane sinks, the size of the keeper insertion hole of the magnet housing may be an inner diameter that allows the keeper alone to enter the magnet housing during occlusion.

Further, in the case of the above-described embodiment, the space formed by the inner peripheral surface of the magnet containing housing 160 has a cylindrical shape. However, in exhibiting the effects of the present invention, the shape is not limited to a cylindrical shape. .

1 denture and its mounting attachment 20 stump 21 lower end 22 upper surface 25 root canal 30 mucous membrane 40 periodontal ligament 50 implant 60 jawbone 80 surveyor 90 saliva layer 100 denture 111, 112, 113, ... (110) artificial tooth 120 denture Floor 130 Housing accommodating recess 150 Magnet 160 Magnet accommodating housing 161 Cylindrical body 162 Inward flange 163 Lid cover 165 Keeper insertion hole 170 Gap (space)
200 abutment tooth 209 wax 210 (310, 410) keeper holder 211 (311, 411) holder main body 212 (312) recessed portion 213 (313) surrounding upright portion 215 (315, 415) holder fixing leg portion 250 keeper 251 upper surface 255 Keeper attachment handling pin 256 Housing attachment position/posture adjustment pin 350 Position adjustment disk 356 Through hole for disk temporary attachment

Claims (3)

A denture comprising an elongated denture base in which at least two artificial teeth are arranged adjacently and the plurality of artificial teeth are fixed on the top thereof; and an attachment for attaching the denture to an abutment tooth, wherein In the denture and its mounting attachment that can be attached to the abutment tooth by magnetic pulling force,
The abutment tooth can be fixed to the upper surface of the root stump by attaching a keeper made of a magnetic member formed so as to be tightly coupled to the upper surface of the stump by the magnetic pulling force of the magnet, on the upper surface of the stump. is to be formed,
The denture is formed with a bottomed housing accommodating recess for inserting and holding the portion of the abutment tooth protruding from the mucous membrane at a predetermined position in the longitudinal direction on the bottom side of the denture base that contacts the mucous membrane. and the housing accommodating recess includes a magnet accommodating housing having a magnet accommodating space that accommodates the magnet so as to be movable in a predetermined direction,
The portion of the magnet containing housing exposed from the bottom surface of the denture base is formed with an inward flange that prevents the magnet from falling off from the magnet containing housing when the denture is attached to the abutment tooth,
When the denture is attached to the abutment tooth, the magnet in the magnet containing housing is placed on the side of the denture that adheres to the mucous membrane of the denture base and on the tip side of the artificial tooth that is positioned above the magnet containing housing. It is housed so that it can move freely along the direction connecting
The portion surrounded by the inwardly directed flange of the magnet housing has a magnetic pulling force that causes the keeper to be in direct contact with the magnet when the denture is attached to the abutment tooth, and the denture is attached to the abutment tooth. at least a part of the surface of the keeper that contacts the magnet is formed as a keeper insertion hole that can enter the interior of the magnet containing housing when the keeper is attached to the magnet housing and engaged with the magnet;
When the denture is attached to the abutment tooth, the keeper insertion hole of the magnet containing housing exposed on the bottom surface of the denture base of the denture is brought closer to the keeper, so that the magnet is pulled by the magnetic pulling force of the magnet. The denture is attached to the abutment tooth while the keeper is tightly fixed and the denture is guided to the correct attachment position with respect to the abutment tooth, and in this attached state the entire bottom surface of the denture base of the denture is Together with the adhesion force generated by the close contact through the saliva layer, the denture is maintained in a state of being attached to the abutment tooth,
When the denture is attached to the abutment tooth and then occlusion, the occlusal force sinks the entire bottom surface of the denture base of the denture into the mucous membrane, and the magnetic force of the magnet coupled to the keeper by the magnetic pulling force of the magnet. The magnet is moved in the magnet containing housing to the side of the artificial tooth positioned above the magnet containing housing of the denture by inserting the connecting portion with the keeper from the keeper insertion hole into the magnet containing housing,
According to the degree of occlusion, as the compressive repulsive force applied from the mucous membrane to the denture base sinking into the mucous membrane increases, the magnet further moves within the magnet containing housing toward the artificial tooth side of the denture. and even when the occlusal force becomes the largest and the denture base of the denture stops sinking to the mucous membrane due to a balance with the compressive repulsive force received from the entire mucous membrane in close contact with the denture base, A denture and its attachment, characterized in that a certain space is secured between the magnet and a portion of the interior of the magnet containing housing facing the magnet on the side of the artificial tooth facing the magnet. 1. The keeper is attached to the top of an implant directly embedded in the jawbone, instead of being attached to the upper surface of the stump that is connected to the jawbone through the periodontal ligament. a denture and its mounting attachments as described in . A denture that can be used only with the denture and attachments thereof according to claim 1 or claim 2.

Images