JPH08117B2 - Denture clasp detector - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention attaches a patient's dentition to a modeled model, and fills in a defect in the dentition.
The present invention relates to a device for detecting a portion for fixing a clasp, which is a fixing means, to a tooth corresponding to an abutment tooth of a model for fixing a denture.

[0002]

2. Description of the Related Art When manufacturing a local denture, it is important in dental technology to determine the attachment / detachment direction of the denture, and conventionally, a parallel measuring device (Savayer) 1 shown in FIG. Then, the platform M was tilted to determine the attachment / detachment direction of the denture. In this method, a detecting needle called an analyzing rod is applied to the tooth side surface, and the tip of the clasp is put in an undercut below the contact point, and the denture is maintained by the elasticity of the clasp. Although it is considered that the denture designed in this way is attached and detached in a direction parallel to the analyzing rod, in most cases, the denture is detached by applying a rotational motion alternately to the left and right. However, the rotational motion has not been sufficiently analyzed in the conventional denture design. “Clasp Denture with a rotation path for attaching and removing dentures” (Quintessence of Dental Technology 198
As you can see in the article such as December 9 issue, page 1523), the rotation path (Rotary path)
Although there has been an interest in a method for attaching and detaching a denture using the above, a specific device or apparatus for executing the method has not been proposed yet.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and an object thereof is to find an optimum portion for hanging a clasp, which is a means for fixing a local denture, on an abutment tooth. It is to be able to accurately grasp in advance.

The present invention also provides a local denture having a clasp which is designed to be attached and detached with a rotational movement, so that a necessary and sufficient maintenance force can be obtained when it is attached to an actual intraoral tooth. The purpose is to

[0005]

In order to solve the above-mentioned problems, the present invention provides an upper surface of another tooth C'which is the center of the rotational movement, in which the clasp is attached to and detached from the tooth C by a mounting method utilizing a rotation path. A first detector 11 whose tip is in contact with the first
It is possible to fix one of the first and second detectors 11 and 12 and the second detector 12 that can come into contact with the side surface of the tooth C that holds the clasp in parallel with the detector 11, and set the other one to both. A support 13 for mounting the detectors so that they can be approached and separated while keeping parallel to each other, and a support 1 for disposing the first and second detectors 11 and 12 above the model B set upward.
The detector for the denture clasp portion is configured by the mounting member 14 that is swingably attached to the denture clasp 3.

[0006]

FIG. 1 shows a parallel measuring device, that is, a savager 1, and a platform M for setting an intraoral plaster model B for producing a denture. These are detectors for a denture clasp part according to the present invention. Used with 10. The savigator 1 has a base 2 and a column 3 standing upright on the rear portion thereof, and the column 3 has a bending arm 4
A support rod 5 is vertically attached and vertically movable via. Reference numeral 6 denotes a shaft holder, which has a shaft insertion port on the lower surface thereof, and fixes the inserted shaft-shaped mounting member 14 with a setscrew 7, as described later. Each part can be fixed appropriately.

The detector 10 shown in FIGS. 1 and 2 relates to the first embodiment of the present invention, and has only one support 13 made of elongated linear rods on the left and right. This support 1
3 is made of a rigid material and has a length sufficient to cover the space between the teeth in the oral cavity, and has scales 25 provided along the length direction.

A first detector 11 is movably provided on the support 13. That is, the slider 16 which is slidable along the length direction of the support body 13 is fitted and the first detector 11 which protrudes in the sliding direction, that is, the direction orthogonal to the length direction of the support body 13 is so-called below the slider 16. It is attached as one of the rising rods. The first detector 11 is made of a needle-shaped rigid body so that the tip of the first detector 11 contacts the upper surface of the tooth C '. A mounting member 14 for mounting the detector 10 on the savigator 1 is pivotally supported on a slider 16 by a support shaft 26 so as to be swingable.

A second detector 12 arranged in parallel with the first detector 11 is attached to one end of a support 13. The insertion port 15 through which the second detection element 12 is inserted is formed at the top and bottom of the end portion, and the second detection element 12 is inserted therein and fixed by the screw 20. The second detector 12 shown in FIG. 1 is made of a needle-shaped rigid body similar to the first detector 11, but the second detector of FIG.
2'is shown and both detectors 12, 12 'can be freely exchanged in the present invention.

A stopper 17 for the slider 16 to which the first detector 11 is attached is provided at the other end of the support body 13, and a window 28 is opened in the slider 16 for the first detection. It is convenient for taking note of the position of the child 11.

The detector 10 according to the first embodiment described above can sufficiently achieve the object of the present invention. In that case, however, it is premised that the detector 10 shown in FIG. 1 is used together with the detector 10. Illustrative Savaya 1
Has a telescopic arm 4 and a support rod 5 that can move up and down, and has a high degree of freedom. On the other hand, using a savigator that does not have as many degrees of freedom as the one in FIG.
It is possible to provide the detector according to the second embodiment shown in FIG.

The detector according to the second embodiment is also an elongated straight rod 1.
8, a first detector 11 is slidably provided by using a slider 16, and an upper and lower insertion hole 27 is formed at one end of a straight rod 18 thereof, and a second detector 12 is provided in parallel therewith in parallel with the first detector 11. Is the same as that of the first embodiment. However, in the case of the second embodiment, a similar elongated straight rod 19 is arranged above one straight rod 18, and they are connected by a short connecting rod 21 pivotally supported at the other end to form a lower straight rod 18. A movable rod 23 is axially supported upward at one end to form a parallel link as a whole, and is characterized in that a support 13 having a large degree of freedom is formed.

The mounting member 14 is an upper straight rod 19 of the support 13.
It is attached via a slider 24 and a bearing arm 30 to the rod 23. Therefore, it can be said that it can move relatively along the lengthwise direction of the rod 19 as in the case of the first detector 11, and is also orthogonal to the rod 19. It is rotatable about two orthogonal axes 26 and 29. In FIG. 3, the same components as those in the first embodiment are referred to by the reference numerals, and detailed description thereof will be omitted. Incidentally, 31 is the first detector 1
The operation knob provided in 1 is shown. Reference numerals 32 and 33 denote stoppers, which prevent the movable rod 23 from coming out upward or downward from a vertical hole 22 formed in one end portion of the upper straight rod 19 in the vertical direction.

The detector 10 according to the present invention constructed as described above is a local denture D for filling a defective portion of a dentition of a model B modeled from the patient's oral cavity for making a denture.
It is used to detect and determine the clasp site, which is a means of immobilization of. The mounting member 14 of the detector 10 is inserted into the shaft holder 6 of the savager 1, and the screw 7 is tightened and attached. The instrument to be used may be either the first or second embodiment, but here, the second embodiment will be described (FIG. 4).

When the model B is an upper jaw model as shown in FIGS. 4 and 5, the right first to fourth teeth and the left first to fifth teeth of the dentition are shown.
The teeth, the left seventh and eighth teeth are healthy teeth, and the right fifth to eighth teeth and the left sixth tooth are defective teeth. Therefore, it is the current task to determine the clasp site in order to fix the local denture D consisting of the right fifth to eighth teeth and the left sixth tooth in the oral cavity, and the abutment tooth for maintaining the denture D is Right fourth tooth C, left fifth tooth C'and left seventh tooth
It becomes a tooth C ″ (see FIG. 4). The clasp K is a member that is attached to the abutment tooth so as to surround it and that secures the denture D so that it does not come off. It has left and right arm portions m and n to be stopped and a rest r that is hung on the upper ends of the abutment teeth to prevent the denture D from sinking.

In order to determine the portion where the clasp K should be attached to the abutment tooth C, the conventional design is first performed, and then the rest r of the abutment tooth C'which will be the center of rotation when the denture D is removed. The tip of the first detection element 11 is applied to the upper end on which the second detection element 12 is applied (FIG. 4), and the second detection element 12 is brought into contact with the outer surface of the abutment tooth C on which the clasp K is applied. At that time, the second detector 12
And the contact point of the abutment tooth C is marked on the tooth side surface (marked with X in FIG. 7). The colored detector 12 'can be used for this marking. FIG. 7 (a) shows a state in which the circle mark of the clasp part determined by the conventional design and the mark x of the contact point are in agreement, and therefore, the clasp cannot maintain. In FIG. 7B, it can be seen that the second detector 12 is in contact with the circles and the crosses, and the clasp cannot be maintained.
In FIG. 7 (c), the contact point X of the second detector is distant from the clasp point O, and therefore the clasp K hangs under the undercut portion and is locked inside the rotation path. It is judged that the maintenance of can be expected. With respect to the other abutment teeth C ′ and C ″, the same operation as described above is repeated to determine the optimum clasp site.

[0017]

Since the present invention is constructed and operates as described above, it is possible to accurately detect in advance the optimum portion for hanging the clasp, which is a means for fixing a local denture, on the abutment tooth. And can decide. Therefore, according to the present invention, a local denture having a clasp that is designed to be attached and detached with a rotational movement has an effect that it can be fixed to an actual abutment tooth in the oral cavity with a necessary and sufficient maintenance force.

[Brief description of drawings]

FIG. 1 is a perspective view showing a detector and a savigator according to a first embodiment of the present invention.

FIG. 2 is a front view of the detector of the first embodiment.

FIG. 3 is a front view of a detector according to a second embodiment.

FIG. 4 is a plan view of an intraoral model and a partial denture.

FIG. 5 is a front view of the same use state.

FIG. 6 is an explanatory view of the same as above.

FIG. 7A is an explanatory diagram of an example without maintenance. (B) Explanatory drawing of the example without maintenance. (C) Explanatory drawing of an example with maintenance.

Claims (4)

[Claims] 1. Attached to an intraoral model B for making a denture,
A device for detecting a portion for fixing a clasp, which is a fixing means, to a tooth C corresponding to an abutment tooth for fixing a partial denture that fills a missing part of a dentition, and is a mounting method using a rotation path. The clasp is attached to and detached from the tooth C by means of which the tip is brought into contact with the upper surface of another tooth C ′ which is the center of the rotational movement.
The detector 11 and the second detector 1 capable of contacting the side surface of the tooth C to which the clasp is hooked in parallel with the first detector 11.
2 and a support 13 for fixing one of the first and second detectors 11 and 12 and attaching the other one so as to be able to approach and separate while keeping the two detectors parallel to each other. A clasp part detector for a denture, which comprises a mounting member 14 swingably attached to a support 13 for disposing the first and second detectors 11 and 12 above the model B. 2. The support 13 is composed of one elongated straight rod, and the second detector 12 is detachably mounted in a small hole 15 provided in a direction orthogonal to one end of the straight rod. The slider 1 slidable along the support 13 of the support 1
3. The detector for the clasp part of a denture according to claim 1, wherein the first detector 11 is attached in a direction orthogonal to 3 and a retainer 17 for the slider 16 is provided at the other end of the support 13. 3. The support 13 comprises two elongated straight rods 18, 19 which can be arranged in parallel, a short connecting rod 21 which rotatably connects them at the other end, and one end of one straight rod 18. The movable rod 23 is rotatably pivotally supported, and the upper portion of the movable rod 23 projects upward through a vertical hole 22 provided in the other linear rod 19 in the vertical direction. The detector of the clasp part of the denture according to claim 1, wherein two detectors (11, 12) are provided, and the mounting member (14) is attached to the other straight rod (19) through a slidable slider (24). 4. The second detector 12 is detachably fixed to one end of the support 13 by a screw 20, and is replaceable with a colored detector 12 'such as a chalk that can be colored. A detector for the clasp part of the denture described.