JPH0251342B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION {Industrial Field of Application} The present invention relates to a device for maintaining a local denture on front or molar teeth.

{Prior Art} As a device for maintaining a local denture on front teeth or molar teeth, there is known, for example, the device shown in FIGS. 12 and 13 disclosed in Japanese Utility Model Application Publication No. 57-53260.

In Figures 12 and 13, A is a denture, B is a retained crown, C is a retained tooth, D is a recess provided on the cervical side of the denture A on the side opposite to the retained crown B, E is a gingiva, and 21 is an elastic It is a joint member made of a loop-shaped metal wire that can be deformed, and its base side is embedded in the denture A and placed in the recess D. 22 is a cut provided in the joint member 21, 23 is a fixed member whose end is fixed to the maintenance tooth crown B, and a rod-shaped support 24 of a size that can be inserted into the joint member 21 is provided at the end, And its tip has a slightly larger diameter.

Fixation of the denture by this retainer places the denture A in a predetermined position. Then, since the joint member 21 and the support body 24 overlap, when the denture A is pushed slightly strongly in the direction of the gingiva E, the large diameter portion at the tip of the support body 24 elastically deforms the joint member 21 through the cut 22, A support body 24 is inserted therein. When the large diameter part at the tip of the support body 24 passes, the joint member 21 returns to its original state, so the joint member 21 is locked to the large diameter part of the support body 24, and the denture A is held in a state where it does not separate unnecessarily. is fixed to the retaining crown B.

When separating denture A, reverse the above case.
The denture A is moved somewhat strongly in the direction of separating it from the gingiva E, the joint member 21 is elastically deformed, and it is separated from the support body 24.

{Problems to be solved by the invention} The conventional local denture maintenance device described above applies a rather large force to the denture A in order to cause the joint member 21 to slightly elastically deform both when the denture A is attached and removed. Since the denture A is required, there is a problem in that it is difficult to attach and detach the denture A.

In addition, since the force that elastically deforms the joint member 21 also acts on the retaining tooth crown B via the support body 24, there is a problem of giving strain to the retaining tooth C, and since the joint member 21 is repeatedly elastically deformed, There is a problem in that the spring stress tends to be weakened and its lifespan is relatively short.

The present invention solves the above-mentioned problems, and aims to provide a local denture maintenance device that allows the denture to be attached and removed easily and with ease, and has a long lifespan.

{Means for Solving the Problems} The local denture maintenance device of the present invention has a fixing member fixed to a retaining tooth crown and a martensitic metamorphosis that is fixed to the local denture and can be locked and detached from the fixing member. A retaining device for a local denture comprising a movable member made of a shape memory alloy, wherein the fixed member is provided with a support on which the movable member made of the shape memory alloy locks. In addition, the movable member is formed of a base portion fixed within the denture and two movable portions that protrude from the base and are lined up horizontally on the buccal and lingual sides toward the fixed member, and these movable portions It is configured to undergo martensitic transformation at a set temperature, deform into a memorized shape, and lock onto the support body, and when the two movable parts deform in the direction of closing inward or in the direction of opening outward. It is characterized in that when the support is deformed, either one of the supports is locked to the locking protrusion of the support.

The shape memory alloy may be unidirectional or bidirectional.

{Operation} The local denture maintenance device of the present invention fixes the support to the maintenance crown, and fixes the movable member to the denture at its base. Then, the pair of movable parts are slightly deformed in the direction of moving away from each other or in the direction of moving closer to each other,
The lower denture is moved downward and the upper denture is moved upward to set the denture in place. Then, the movable part becomes lockable to the locking protrusion of the support. In this state, the movable part is heated to a temperature higher than the set temperature, that is, the martensitic transformation temperature, by pouring hot water into the oral cavity. The movable parts are then fixedly attached to the support by restoring the memorized shape and locking each movable part to the locking protrusion of the support.

When removing the denture, cool the moving part by pouring cold water into the oral cavity, etc. The unidirectional shape memory alloy moving part will reduce its rigidity and become easier to elastically deform, so the denture cannot be moved. Then, the movable part easily elastically deforms and is easily separated from the locking protrusion of the support. Furthermore, when removing the set denture, the movable part deforms slightly, so that the denture can be set without any special deformation of the movable part.

If the movable member is made of a bidirectional shape memory alloy, cool the movable part with cold water or the like to below the set temperature when setting the movable part so that it is not locked in the locking protrusion of the support. Transform it in advance. After the denture is set in a predetermined position, the movable part is heated to a temperature higher than the set temperature and deformed, and the movable part is locked to the locking protrusion of the support, thereby fixing the denture.

{Example} A first example of the local denture maintenance device of the present invention will be described based on FIGS. 1 to 3.

In Figures 1 to 3, reference numeral 1 denotes a movable member fixed to the denture A, with a cross section 8 on the side surface 3 of the rectangular parallelepiped base 2.
Square rod-shaped movable parts 4 and 5 are protruded from each other at appropriate intervals and are made of a unidirectional shape memory alloy such as a nickel-titanium alloy. 4
Reference numeral a denotes an engaging portion provided at the tip of the movable portion 4 so as to protrude toward the movable portion 5 side, and the tip thereof may be arbitrarily placed close to or in contact with the movable portion 5 depending on the positional relationship with the movable portion 5. Reference numeral 6 denotes a notch provided in the base 2, which ensures the fixation of the base 2 to the movable member 1.

Reference numeral 8 denotes a fixing member that is fixed to the maintenance crown B, and this has a rod-shaped support 10 erected in a direction perpendicular to the base 9 whose end is fixed to the maintenance crown B, and the tip of which is fixed to the maintenance crown B. Locking protrusions 11a, 11b on both sides in terms of diameter
It is composed of Reference numerals 12a and 12b are holding pieces protruding from the ends of the base 9 on both sides where the locking protrusions 11a and 11b are provided, and their opposing surfaces are sloped.

A movable part 4 protruding from the former movable member 1,
5 spacing and locking protrusions 11a, 11b of the support body 10
It is possible to insert the support body 10 between the movable parts 4 and 5 and to lock the movable parts 4 and 5 to the locking protrusions 11a and 11b by substantially matching the dimensions in the opposing directions. Movable parts 4 and 5 are formed in the.
The movable parts 4 and 5 are provided with the locking protrusion 11.
The shape of the movable parts 4 and 5 when they are locked is memorized, and the restoration temperature (martensitic transformation temperature) of the movable parts 4 and 5 is set to a temperature slightly higher than the intraoral temperature, for example, about 40°C to 45°C. It is set. Further, the holding pieces 12a and 12b are provided at positions where the movable parts 4 and 5 can be held between them from the outside.

As shown in FIG. 2, the movable member 1 and the fixed member 8 are connected to
The base 2 is embedded and fixed in the denture A by placing it in the recess D provided at the cervical end of the denture. On the other hand, the fixing member 8 is fixed to the cervical portion of the maintenance crown B by its base 9, and causes the support body 10 to protrude toward the denture A side.
Moreover, when the denture A is set in a predetermined position, the support body 10 is inserted between the movable parts 4 and 5,
The movable member 1 is attached to the denture A, and the fixed member 8 is attached to the maintenance tooth crown B, respectively, so that the movable parts 4 and 5 are locked to the locking protrusions 11a and 11b. E is the gingiva.

The fixation of the denture A by the movable part 1 and the fixed member 8 is as follows:
Both or one of the movable parts 4 and 5 are slightly bent in the direction of separation so that the locking protrusions 11a and 11b of the support body 10 can pass between them. Then, the denture A is set in a predetermined position, and the support 10 is inserted between the movable members 4 and 5. At this time, the movable parts 4 and 5 are located between the upper ends of the holding pieces 12a and 12b. In this state, hot water at a temperature higher than the set temperature of the movable parts 4 and 5, for example, about 45°C to 50°C, is poured into the oral cavity,
The movable parts 4 and 5 are heated to return them to their pre-memorized shapes. Therefore, the rigidity of the movable parts 4 and 5 increases, and they clamp the support body 10 and engage the locking protrusion 11 as shown in FIG.
a, 11b, and the holding piece 12
a, 12b, thereby preventing unnecessary separation from the support 10.

After the movable parts 4 and 5 return to the memorized shape,
Although the temperature is lower than the set temperature, since the oral cavity temperature is maintained close to the earlier set temperature, it still has sufficient rigidity and will not separate from the support body 10. Moreover, in this embodiment, as shown in FIG. 3, the holding pieces 12a and 12b hold the movable parts 4 and 5 from the outside and prevent the movable parts 4 and 5 from being deformed. Unnecessary separation of movable parts 4 and 5 from 10 can be more reliably prevented.

Furthermore, the engaging portion 4a provided on the movable portion 4 is also connected to the support 1.
0, the denture A will not move away from the retaining crown B in the direction opposite to the retaining crown B.

In addition, since the movable parts 4 and 5 firmly clamp the support body 10 due to their rigidity as described above, the holding pieces 12a and 12b can also be omitted.

When removing the denture A, the movable parts 4 and 5 are kept at a low temperature by pouring cold water into the oral cavity. Then, the rigidity of the shape memory alloy movable parts 4, 5 decreases and elastic deformation becomes easy, so if the denture A is lightly moved upward or downward depending on the mounting position, the movable parts 4,
5 is easily deformed and separated from the support body 10, and the denture A can be removed.

The reason why the movable parts 4 and 5 have an octagonal cross section is that both edges of their opposing surfaces are sloped, so that the support 10 can be inserted between the movable parts 4 and 5, and the support 10 can be easily inserted between the movable parts 4 and 5.
Since this is to facilitate the separation of the movable parts 4 and 5 from the movable parts 4 and 5, the opposing surfaces of the movable parts 4 and 5 may be curved, or the cross section may be circular. When inserting the support body 10 between the movable parts 4 and 5, the deformation of the movable parts 4 and 5 is increased, and when separating the movable parts 4 and 5 from the support body 10, the locking protrusion 11a , 11b are sloped, the movable parts 4 and 5 can be easily attached and detached.
It is also possible to make the cross sections of the movable parts 4 and 5 square.

The movable member 1 can also be made of a bidirectional shape memory alloy. In this case, the movable part 4,
5 are heated above the set temperature, they deform in the memorized closing direction and the locking protrusions 11a, 11
Lock it to b. Then, when the movable parts 4 and 5 are cooled to the set temperature or lower, they deform in the memorized opening direction and separate from the locking protrusions 11a and 11b.

Therefore, by cooling the movable parts 4 and 5 before setting and removing the denture A, and by heating the movable parts 4 and 5 to a temperature higher than the set temperature when setting and fixing the denture A. Therefore, the denture A can be easily put on and taken off without strain.

FIG. 4 shows a second embodiment, in which engaging parts 4 are bent toward each other at the ends of the movable parts 4 and 5.
a, 5a are provided. Other configurations are the first
It is the same as the example.

FIG. 5 shows a third embodiment, in which the portion of the base 9 of the fixing member 8 where the support 10 is provided is approximately the same size as the support 10. Other configurations are the first
Same as the example.

6 and 7 show a fourth embodiment, in which a support 10 is erected at the tip of a base 9 protruding from the maintenance crown B,
In addition, locking protrusions 11a and 11b are provided on the support body 10 and the maintenance tooth crown B in a bridging manner.
In this embodiment, it is appropriate to use the movable member 1 having the configuration shown as the second embodiment in FIG.
The engaging parts 4a and 5a are connected to the support body 10 and the locking protrusion 11.
a, 11b.

FIG. 8 shows a fifth embodiment, in which engaging portions 4b, 5b are provided protruding from the distal ends of the movable parts 4, 5 of the movable member 1 on the opposite surfaces of the opposing surfaces.

The fixing member 8 has plate-shaped supports 10a and 10b erected at both ends of the base 9, and their tips are inclined inward to form locking protrusions 11a and 11b. , supports 10a, 10b
The engagement pieces 14a and 14b are bent at the ends facing the denture A, respectively.

The movable parts 4 and 5 have an engaging part 4c,
The shape when 5c is locked inside the locking protrusions 11a and 11b of the fixing member 8 is memorized. Since the other configurations are the same as those of the first embodiment, the same reference numerals are given.

In this embodiment, the movable parts 4 and 5 are deformed in a direction in which they become closer together, and the distal ends of the movable parts 4 and 5 are inserted between the locking protrusions 11a and 11b and inside them. Then, the movable parts 4 and 5 are heated to a temperature higher than the set temperature by, for example, soaking hot water in the oral cavity, and the movable parts 4 and 5 are restored to the memorized shape, and the engaging parts 4b and 5b are connected to the locking protrusions 11a and 11b. The movable parts 4 and 5 are fixed to the fixed member 8 by being locked inside.

When removing the denture A, do so after cooling the movable parts 4 and 5.

FIG. 9 shows a sixth embodiment, in which the distal ends of the supports 10a, 10b in the fourth embodiment are not inclined, but instead are formed into hemispherical or semi-cylindrical shapes protruding from the inner surfaces of the supports 10a, 10b. Stop protrusion 11
a, 11b, and in the same way as in the fourth embodiment, engaging parts 4c, 5c of the movable parts 4, 5 are provided.
It is something that engages. The other configurations are the same as the fourth embodiment.

10 and 11 show a sixth embodiment, in which a concave groove portion 15 is formed in a part of the maintenance tooth crown B, and this concave groove portion 15
A fixing member 8 is provided.

{Effects of the Invention} As described above, the local denture maintenance device of the present invention has a pair of movable parts made of a shape memory alloy, and is locked to a locking protrusion provided on the support of the fixed member. Since the shape of the denture is memorized in the movable part, by slightly deforming the movable part when attaching the denture, each part can be moved against the support without applying special force to the denture. By making the movable part lockable, the denture can be set in a predetermined position, and by heating the movable part with hot water, etc.
They can be reliably locked to the locking protrusion of the support.

When removing the denture, the movable part can be easily deformed or deformed by cooling the movable part with cold water, so that the denture can be easily removed.
Therefore, it is possible to easily attach and detach the denture without putting strain on the retained teeth. In addition, since it is not necessary to forcefully elastically deform the movable parts, even after repeated use over a long period of time,
It is possible to securely fix the denture.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, and FIG. 1 is a perspective view in which a fixed member and a movable member are separated;
Fig. 2 is a partially sectional front view of the installed state, Fig. 3 is a sectional view of the movable part locked to the support,
Fig. 4 is a plan view of the second embodiment, Fig. 5 is a perspective view of the third embodiment, Figs. 6-7 show the fourth embodiment, Fig. 6 is a perspective view, and Fig. 7 is a plan view. , FIG. 8 is a perspective view of the fifth embodiment in which the fixed member and the movable member are separated;
FIG. 9 is a sectional view of the sixth embodiment, FIGS. 10-11 are a seventh embodiment, FIG. 10 is a plan view, FIG. 11 is a sectional view, and FIGS. 12-13 are a conventional example. 1st
FIG. 2 is a partially sectional front view, and FIG. 13 is a plan view of the joint member. A: Denture, B: Maintenance crown, 1: Movable member, 4,
5: Movable part, 8: Fixed member, 10: Support body, 11
a, 11b: Locking protrusion.

Claims (1)

[Scope of Claims] 1. Consisting of a fixed member fixed to the maintenance tooth crown and a movable member fixed to the local denture and made of a shape memory alloy that undergoes martensitic transformation so as to be able to engage and detach from the fixed member. A retaining device for a local denture, wherein the fixed member is provided with a support on which the movable member made of the shape memory alloy is engaged, and the movable member has a base fixed to the denture. It is formed by two movable parts protruding from the base that are lined up horizontally on the buccal and lingual sides toward the fixed member, and these movable parts undergo martensitic transformation at a set temperature and deform into the memorized shape. When the two movable parts are deformed in the direction of closing inward or in the direction of opening outward, the locking protrusion of the support body is configured to engage with the support body. A retaining device for a local denture, characterized in that it locks in the area.