Device for fixing clasp dental prosthesis

FIELD: medical engineering.

SUBSTANCE: device has beam for fixing artificial denture, cramp iron and bracket. The cramp iron is connected to the beam in a way allowing its arrangement on oral surface of abutment tooth. The bracket is set as cantilever on beam edge to be placed in longitudinal slot of abutment tooth that is produced in chewing side of the abutment tooth inclined to oral surface. Longitudinal slot bottom is rounded in cross-section. Longitudinal slot walls are smoothly rounded in cross-section to meet chewing surface of the abutment tooth. At least a part of bracket is manufactured to fit longitudinal slot bottom in its cross-section.

EFFECT: improved features insetting removable prosthesis; provided natural chewing pressure transfer upon abutment tooth.

4cl, 3 dwg

 

The invention relates to prosthetic dentistry and can be used for fastening removable dentures, mainly clasp.

The most common currently is a device for fastening clasp dentures containing beam, designed for fixing on her artificial teeth, clasps and connected to the beam and located on the vestibular and oral surfaces of the abutment tooth, respectively (Germany Application No. 4436516 And 61 With 13/267, publ. 1996), (European patent application No. 0134846 And 61 With 13/225, publ. 1985). The device allows for quick and easy installation removable clasp dentures, and various designs differ only in the form of the clasps.

Restriction devices are: distribution of chewing pressure on the edge of the abutment tooth that the operation of the prosthesis leads to revisionaries transmission of masticatory load on the periodontium.

Known joist attachments, executed in the form of a beam - Patricia mounted on two abutment teeth, and a matrix for forming therein an artificial tooth (Castle fixing dental prostheses”, Lebedenko YOU, Peregudov, A.B., Hopeline Christmas eve, M: Molodaya Gvardiya, 2001, p.18-19). Beams carry out various forms. Rectangular beams come mainly in the lateral parts, and round or oval in froh is decided.

Restriction devices are: the need for two or more abutment teeth with a gap between them; removable clasp prosthesis, if performed directly on the beam, easily installed, and binding directly to the beam can lead to an overload of the abutment teeth, or requires fairly often, once in six months to relocate plastic base of the prosthesis.

Also known various devices for forming artificial teeth in between two supporting that contain inserts made with the possibility of consolidation in the longitudinal horizontal groove of the occlusal surfaces of the abutment teeth, and a beam that was placed all the boxes and connecting the abutment teeth (U.S. Patent No. 4431417 And 61 13/22, publ. 1984), (European patent application No. 017244 And 61 With 13/26, publ. 1985), (U.S. Patent No. 5007, And 61 13/12, publ. 1991). The advantage of such devices is the ability to distribute the load to several of the abutment teeth.

Restriction devices are: the use for the manufacture of a separate non-removable artificial teeth; the necessity for the formation of the artificial tooth of two adjacent abutment teeth with a small gap between them; as there is only one beam element for fixing an artificial tooth t is chewing load in artificial tooth is passed directly to him, that leads to the production of beams of hard material.

A device for fastening a dental prosthesis containing a beam designed for fixing on her artificial teeth, Klammer connected to the beam with the possibility of its location on the oral surface of the abutment tooth, the abutment element mounted on the edge of the beam with the possibility of its location in the groove of the abutment tooth (USSR Author's certificate No. 1801410 And 61 13/10, publ. 1993).

In this technical solution, the supporting element is designed as u-shaped bracket with curved in the opposite direction clamps, which are installed in the side of the vertical slots of the abutment teeth. In the embodiment, the removable clasp prosthesis device is equipped with two clasps, one of which is located on the oral surface of the abutment tooth.

The advantage of this device over others are: the use of two functional elements to transfer the load of the clamp and the support element, and Klammer connected to the beam with the possibility of its location on the oral surface of the tooth, which does not spoil the aesthetic effect during installation of the prosthesis.

Limitations of this technical solution are: the inconvenience of installation of removable dentures if placed too close to the reference tooth of the other of the natural tooth; not bodymist perform in the reference tooth of the two vertical grooves, that increases the duration of the preparatory operations of the abutment teeth, and also leads to additional trauma to the patient during the execution of the preparatory operations; most importantly, this design passes on the abutment tooth along its vertical axis during the chewing load large bending moments, like the use of rail attachments, the friction force in this attachment is not regulated and depends on the length of the vertical slot and the width of the clamp, so that when the atrophy of the alveolar ridge is the castle mount is very rigid and inadequate load bearing teeth; performing in the abutment teeth of the vertical slots and install the retainers leads to unnatural transmission of masticatory load on the supporting teeth, therefore reducing the trauma of the tissues supporting the teeth when installing such a prosthesis can only be achieved in the manufacture of dentures, similar in form to symmetric; in the absence of a significant number of natural teeth such mounting requires a large number located at a small distance from each other of the abutment teeth, which reduces the ability to use the device for his testimony to clasp prosthesis; if the number of the abutment teeth and their unnatural load the e chewing pressure decreases the durability of the clasp prosthesis; the device has a complicated construction, thereby increasing the cost of the prosthesis, as well as getting two clamps in vertical slots when the donning of the prosthesis is rather time-consuming, it leads to complexity of the installation of patients dentures, as well as the time getting used to it.

The closest technical solution, devoid of the above disadvantages, is a device for fastening clasp dental prosthesis containing a beam designed for fixing on her artificial teeth for the clasp dental prosthesis, Klammer connected to the beam with the possibility of its location on the oral surface of the abutment tooth, the bracket installed the console on the edge of the beam with the possibility of accommodation in the longitudinal groove of the abutment tooth, made in the abutment tooth from chewing surfaces (Patent of Russian Federation №2206292 And 61 With 13/275, publ. 20.06.2003).

In this technical solution, the groove perform horizontal natural tooth and bracket length in the longitudinal horizontal groove is selected greater, at least 2/3 the length of mesio-distal occlusal surfaces of the abutment tooth. Essentially, in the known device the external Klammer that most of the known technical solutions was always located on the vestibular surface the displacement of the reference tooth, replaced on the bracket, which is actually inside the longitudinal horizontal groove of the abutment tooth, thereby providing a release force of a denture clasp and secure fit.

Since the notch feature in the natural tooth of the patient, options run to secure the clasp prosthesis should:

- the thickness of the bracket should be not less than 2 mm and provide its location below the occlusal surfaces of the abutment tooth;

to enter the box, made in the form of a matrix beam of attachmen, with the possibility of fixing in the longitudinal horizontal groove of the occlusal surfaces of the abutment tooth and the bracket to perform in the form of a corresponding male mould for placement in the matrix beam of attachmen;

- the surface of the bracket facing the occlusal surfaces of the abutment tooth, to perform curvilinear and the corresponding shape of the occlusal surfaces of the abutment tooth;

- the length of the bracket in the area of the occlusal surfaces of the abutment tooth to choose equal lengths of mesio-distal occlusal surfaces of the abutment tooth or the length of the bracket to choose greater than the length of mesio-distal occlusal surfaces of the abutment tooth and the bracket to do with the possibility of accommodation in longitudinal horizontal groove of the occlusal surfaces of at least the boom of the abutment teeth.

Thus, when using the natural abutment teeth of a patient for fastening clasp dental prosthesis depending on the state of the restraint device anchor tooth is necessary to complicate the design of this device is to improve the quality and expand the functionality of its application.

Solved by the invention is to improve the quality and expand the functionality of the application device for fastening clasp dental prosthesis, simplified construction, in various disorders of the restraint apparatus of the teeth and the mounting bracket and clamp directly to the crown of the artificial tooth.

The technical result that can be achieved by using the claimed device, a simplified design, easy installation removable prosthesis when placed next to anchor an artificial tooth of another natural tooth, reducing the duration of the preparatory operations of the abutment teeth and, therefore, injury to the patient, ensuring the natural transmission of masticatory pressure on the abutment tooth and the reduction of its load, providing the possibility of using the device for different forms of dentures and for a different number of missing teeth, if necessary use the minimum amount the VA abutment teeth, to increase the durability of the design, installation and improvement of use.

To solve the problem with achievement of the technical result in the device for fixing a dental prosthesis containing a beam designed for fixing on her artificial teeth for the clasp dental prosthesis, Klammer connected to the beam with the possibility of its location on the oral surface of the abutment tooth, the bracket installed the console on the edge of the beam with the possibility of accommodation in the longitudinal groove of the abutment tooth, made in the abutment tooth from chewing surface, according to the invention as a reference tooth used an artificial tooth, the crown of which is from his chewing surface a longitudinal groove with an inclination towards the oral surface of the reference tooth, and the bottom of a longitudinal groove in cross section is made rounded, and the walls of the longitudinal groove in cross section is smoothly rounded with the chewing surface of the base of the tooth, while at least part of the bracket in its transverse cross-sectional shape corresponding to the shape of the walls and bottom of the longitudinal groove.

Possible additional embodiments of the device in which it is advisable to:

- the bottom of the longitudinal groove was located in the longitudinal plane balanced and the abutment tooth;

the thickness of the bracket was selected not less than 1.5 mm and provided its location is below or flush with the chewing surface of the base of the tooth;

the wall of the longitudinal groove of the vestibular surface of the abutment tooth was made smooth, and from the oral surface is curved to form a ledge between the bottom of the longitudinal groove and the chewing surface of the base of the tooth.

These advantages, and features of the present invention are explained the best option its performance with reference to the accompanying figures.

1 schematically depicts a view of the chewing surface of the teeth when the device;

Figure 2 is a view along arrow a from the oral surface of a tooth.

Figure 3 - cross section in figure 2.

Device for fastening a dental prosthesis (figure 1) contains the beam 1, which is designed for fixing on her artificial teeth. Klammer 2 is connected to the beam 1 with its location on the oral surface of the reference tooth 3. The bracket 4 has a console on the edge of the beam 1 (saddle-shaped part of a denture clasp) with the possibility of accommodation in the longitudinal groove of the reference tooth 3 (1, 2). A longitudinal groove made in the reference tooth 3 from his chewing surface.

As a reference tooth 3 used an artificial tooth, the crown of which is outside the s chewing surface a longitudinal groove with an inclination towards the oral surface of the reference tooth 3 (figure 3). The bottom of a longitudinal groove in cross section is made rounded. Wall of a longitudinal groove in cross section is smoothly rounded with the chewing surface of the base of the tooth 3. At least part of the bracket 4 (the lower part of the bracket 4) in its transverse cross-sectional shape corresponding to the shape of the walls and bottom of the longitudinal groove. Figure 1 also schematically shows the arc 5 bugel prosthesis.

To ensure the application of best chewing load on the abutment tooth 3 the bottom of the longitudinal groove may be located in the longitudinal plane of symmetry of the reference tooth 3 (figure 3).

To improve the aesthetics of the thickness t of the bracket 4 can be selected not less than 1.5 mm in order to ensure that its location is below or flush with the chewing surface of the base of the tooth 3 (2, 3). In the case of use for fastening clasp prosthesis to the crown of the artificial tooth thickness t of the bracket 4, as shown by the study can be compared with the closest analogue somewhat reduced.

To improve the fixing clasp prosthesis wall of the longitudinal groove of the vestibular surface of the reference tooth 3 is made flat, and from the oral surface is curved with the formation of the protrusion 6 between the bottom of the longitudinal groove and the chewing surface of the base of the tooth 3 (figure 3).

A device for fastening the Bureau is part of the dental prosthesis as follows.

Wear a prosthesis as follows. The bracket 4 is adjudged to slide in an inclined longitudinal groove of the occlusal surfaces of the abutment tooth and Klammer 2 fits tightly oral tooth surface, holding the prosthesis at its equator. Due to the placement of the bracket 4 in a longitudinal groove made in the reference tooth 3 inclined (at an angle of about 30°) to the oral surface of the reference tooth 3 from the chewing surface, it is possible to ease the installation of removable dentures if placed too close to the reference tooth of another natural tooth. When performing machining of the crown of the abutment teeth 3 decreases the duration of the preparatory operations. The device provides constructive natural transmission of masticatory pressure on the abutment tooth 3 and reduces its load, and the bottom of the longitudinal groove may be located in the area of the longitudinal plane of symmetry of the reference tooth 3. Additional improvement of the fixing clasp prosthesis can be achieved due to the fact that the wall of the longitudinal groove of the vestibular surface of the abutment tooth 2 is made flat, and from the oral surface is curved with the formation of the protrusion 6 between the bottom of the longitudinal groove and the chewing surface of the base of the tooth 3, with a longitudinal groove in cross section is S-obratno the form. A device with a longitudinal slot S-shaped form can be used without the clamp 2, then it will be fixed due to the elasticity of the arc 5 bugel prosthesis. However, in this case, decrease the possibility of activation of the attachment.

A longitudinal groove does not necessarily have to be performed with direct bottom in its longitudinal cross-section, as shown in figure 2. The longitudinal groove may be partially and fully rounded bottom, a convexity directed towards the chewing surface (figure 2 not shown). This allows more gentle dissection to the coronal portion of the abutment tooth 3.

The design allows the manufacture of prostheses of different forms with different amounts of missing teeth. In addition, it is possible to use for the installation of the prosthesis minimum number of abutment teeth 3. The longitudinal groove may be made in the crown of the reference tooth 3 method of modeling wax composition or from blanks made of molded plastic, comprising a matrix and Patricia, respectively.

The most successful of the claimed device for fastening a dental prosthesis is industrially applicable in prosthetic dentistry for fixing dentures, mainly clasp.

1. Device for fastening clasp prosthesis containing a beam prednaznachennoe is for fixing on her artificial teeth for the clasp dental prosthesis, Klammer connected to the beam with the possibility of its location on the oral surface of the abutment tooth, the bracket installed the console on the edge of the beam with the possibility of accommodation in the longitudinal groove of the abutment tooth, made in the abutment tooth from chewing surface, characterized in that as a reference tooth used an artificial tooth, the crown of which is from the chewing surface of the longitudinal groove with an inclination towards the oral surface of the abutment tooth and the bottom of a longitudinal groove in cross section is made rounded, and the walls of the longitudinal groove in cross section is smoothly rounded with the chewing surface of the base of the tooth, with at least part of the bracket in its transverse cross-sectional shape corresponding to the shape of the walls and bottom of the longitudinal groove.

2. The device according to claim 1, characterized in that the bottom of the longitudinal groove is located in the longitudinal plane of symmetry of the anchor tooth.

3. The device according to claim 1, characterized in that the thickness of the bracket is chosen not less than 1.5 mm, and providing its location is below or flush with the chewing surface of the base of the tooth.

4. The device according to claim 1, characterized in that the wall of the longitudinal groove of the vestibular surface of the abutment tooth is made smooth, and from the oral surface - KRI is ainamoi with the formation of the protrusion between the bottom of the longitudinal groove and the chewing surface of the base of the tooth.



 

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