ES2369741T3 - MOLD FEMALE BAR. - Google Patents

Abstract

Female bar mold (10) for attaching a denture superstructure to a male bar mold (1), the female bar mold comprising a sleeve (11) arched in the cross-section at least approximately U-shaped, which can be placed on the male bar mold, on which at least one retaining element (14) is arranged to hold the denture superstructure, the at least one being retaining element (14, 14 ', 14' '; 141; 142) a part formed in the sleeve with essentially occlusal orientation, characterized in that the at least one retaining element (14; 14 ', 142,) extends over the entire length of the sleeve (11) and in the cross section presents the shape of a head (14 '; 143, 148) with connecting neck (14 "; 144, 147), so that the connecting neck forms on both sides a retaining recess (14' '; 145, 146) and the connecting neck of the at least one retaining element being displaced c on with respect to the vertex line of the sleeve.

Description

Female bar mold

The present invention relates to a female bar mold for attaching a denture superstructure to a male bar mold, according to the preamble of claim 1.

Female bar matrices are part of a bar joint with which partial or total prostheses are held in a retained manner in the implant in the lower or upper jaw. Such bar joints are constituted by a male bar mold and a female bar mold. The male rod mold is a precision mechanical anchoring element, which comprises a rod that runs between implants and orally blocks these together. The entire bar with the fixing means for fixation in the implants is called the male bar mold.

A female bar mold is integrated in the removable part of the dental prosthesis. The female bar mold, often referred to as bar retention, is constituted by a sleeve which is provided with corresponding retention elements to cause an anchoring in the denture superstructure.

In modern superstructures a metal support structure must be present on which the plastic superstructure itself is attached. The support structure is called a cast iron model. For the union of the model casting with the plastic structure, the model casting has perforations called polymerization windows.

While the development, which is often carried out by dentists, has essentially dealt with the decoupling connection between the female bar mold and the male bar mold, the problem of anchoring the female bar mold in the superstructure of Dental prosthesis, since this problem occurs essentially only in dental laboratories that are dedicated to the fabrication of the denture superstructure. Precisely in the case of the fabrication of the denture superstructure, however, it has been shown that the retention elements in the sleeve of the female bar mold can absorb an insufficient retention force, since the retention elements could be extraordinarily poorly held conditioned by the structure. The usual structures of the female bar matrices currently provide a sleeve in the cross-section at least approximately U-shaped, which in each case have a longitudinal surface that runs in a buccal way and one in a lingual way practically along the line of vertex, which have a maximum extension in the lingual or buccal direction, so that they do not exceed the width of the sleeve. This is also necessary since otherwise the thickness of the wall of the denture superstructure or of the dental structure would become thin wall or protrude from it.

The bar joint is a development of Dr. Hans Dolder and represents a solution to hold dentures that are not supported only exclusively in a gingival manner. As already mentioned, the Dolder bar has shown its effectiveness for many years. EP 1 192 916 shows a further development of the bar in which the fixing of the female mold on the male mold that functions as a bar, does not work with an elastic mechanical support, but with a permanent magnet adapted to the bar in a formal way Which is surrounded with a cuff. Also in the case of this solution, retention elements are formed lingually and orally, which form the shape of an elongated nose, laterally shaped. Also in this case the anchoring of the denture suprastructure is performed only in a rudimentary way.

From DE-3009758A a female rod mold is known which is constituted by a sleeve with pins formed therein, which run in the occlusal direction. The retention forces that can be obtained with it are minimal.

On the contrary, the solution according to DE-29609304 U is conventional, in which the female rod mold is formed as a sleeve with buccal and lingual shaped fins.

Absolutely unusual is a male rod mold, which is practically shaped in the patient and correspondingly the female rod mold is also formed as a U-shaped sleeve, right angle in the cross section and the mold is formed together female and male mold. The solution according to US2003 / 0211 444 cannot therefore be combined with a Dolder bar.

Finally, document US-4209 904 is known as a female bar mold that is formed by a number of superimposable retentions on the Dolder bar, the retentions presenting a sleeve section in which an appendage bent upward in the occlusal direction is formed. . The solution is suitable in itself only for superstructures without model casting, that is, without metal reinforcement. If the ear is in a place where the palatine surface of the teeth runs very close to the bar, then the retention ear should be sanded and the grip becomes very weak.

Accordingly, it is an objective of the present invention to improve a female bar mold of the type mentioned above so that the retention forces of the female bar mold with respect to the denture superstructure can be raised without weakening, in this respect, the suprastructure of dental prosthesis placed on it or without having to accept other inconveniences of the state of the art.

This objective solves a female rod mold according to the preamble of claim 1. The continuous configuration of the retention elements allows the dental technician to adapt the retention element by means of polishing in any place without damaging the sleeve, without there is a weakening of the structure or without other negative effects.

In most cases, essentially more space in the occlusal direction is available to the laboratory technician who manufactures a denture superstructure. Since the forces that occur in case of use act essentially in an occlusal manner, however, it is necessary that the retention elements or the at least one retention element be lowered so that it deviates from the occlusal direction.

In the drawings the preferred embodiments of the object of the invention are represented in a simplified manner and are explained by the following description.

Sample:

Figure 1 the view of a Dolder bar fixed in two implants in perspective representation

Figure 2 represents a section through a first embodiment of a female bar mold perpendicular to its longitudinal direction, while

Figure 3 shows the same representation of a second embodiment.

Figure 4 shows a partial view of a female bar mold from the side that is used in a special way. Finally shows

Figure 5 an especially preferred embodiment of a female rod mold with a cross-sectional shape configured in a different way in side view and

Figure 6 in a perspective representation. In

Figure 7 shows a female bar mold of the conventional type on a smaller scale.

First of all, it now deals with Figure 7, in which a conventional female bar mold is shown in the cross-section. The female bar mold forms the tightening part with which a total or partial prosthesis is elastically fastened on a male bar mold. Therefore, in the placed state, the partial or total prosthesis covers the Dolder bar, according to figure 1, completely. In this regard, the length of the female bar mold corresponds at most to the length of the beam or bar 2. The female bar mold itself is designated in this case with A. It is constituted by an elongated sleeve B in the form of an arc in the cross section. This sleeve is often also referred to as a retention sleeve, since it is placed correspondingly, as mentioned, on the bar 2 of a male mold of bar 1. The retention sleeve B is delimited in longitudinal direction on both sides by walls of press C. These become a support arch. In the support arch area, retention elements E are formed. The path of these retention elements runs exactly in a buccal-lingual manner. Given that the forces to be absorbed from the denture superstructure essentially run in the occlusal direction, the direction is not too important in itself but rather the dimension of the retention elements. In the case of the previous configuration, it was not possible to increase the retention elements, since they exceed the width of the two clamping walls.

In Fig. 2, a preferred embodiment of the female mold according to the invention is shown in a cross-section in a longitudinal manner with respect to the orientation of the female bar mold. The female bar mold is designated in conjunction with 10. This comprises the sleeve or retaining sleeve 11 which also in this case also has two clamping walls 12 that run longitudinally, arranged approximately in parallel. In this case, the two clamping walls 12 also become a support arch 13. At least one retaining element 14 must be present on the support arch 13, which is essentially oriented in an occlusal direction. In this regard, the design of the retaining element 14 must be such that there is at least one recess that deviates from the occlusal direction. Given that in the case of chewing, not only forces are produced in the occlusal direction on the superstructure but also components of force that deviate from it, which act essentially in the oral or lingual direction are added, is the arrangement that essentially runs in the direction occlusal of the at least one retaining element 14 especially advantageous since these force components can also be absorbed optimally.

In the embodiment according to figure 2 two retention elements are shown. A first retention element is oriented practically only in the occlusal direction and is designated 141. This first retention element 141 runs along the entire length of the female bar mold 10 or the entire length of the sleeve 11. It has essentially a sectional shape transverse forming a head 143, which is joined forming a piece on a neck 144 with the support arch 13. Due to the neck 144 of the first retaining element, recesses 145 are produced on both sides that can continuously absorb forces that occur essentially in occlusal direction. However, in order to better anchor the anchoring of the foundry material to be applied thereto of the denture superstructure, a second retaining element 142 is provided in this preferred embodiment which is inclined so as to do so with respect thereto. to the first retention element at an angle α. This second retaining element runs in the same way parallel to the longitudinal direction of the female bar mold 10 and in the same way parallel to the first retaining element 141. Due to this inclined shape, an even larger recess 146 below this results. second retention element 142.

The entire sleeve 11 is a prefabricated element purchased by the dental laboratories and subsequently modeled, these assembling the sleeve 11 in a casting of G models and due to this the dental prostheses are formed. The retaining elements 14 protrude from the casting of G models and serve, as mentioned, for the continuous joint fastening of the denture suprastructure. According to this, a gap that allows a certain spring movement of the clamping walls remains between the clamping walls 12 of the sleeve 11 and the casting of models G.

The continuous configuration of the retention elements allows the dental technician to adapt to the circumstances the retention element by polishing in any place without damaging the sleeve, without causing a weakening of the structure or without other negative effects.

In Fig. 3 a second preferred embodiment of the object of the invention is shown in the same representation as in Fig. 2. Again the female bar mold 10, constituted by the sleeve 11, included in the cast iron part is shown. G models, and the sleeve 11 again has clamping walls 12 that run parallel to each other and whose wall thickness, as in the case of the embodiment according to Figure 2, from the support arch 13 towards the ends ends in a tapered manner to thereby increase the spring action of the clamping walls 12. In the support arch 13 this time a single retaining element 14 is formed. This single retaining element 14 is it extends again over the entire length of the sleeve 11 and also has in this case a head 14 'and a neck 14 ". Essentially, the retention element 14 is oriented in the occlusal direction, however, it has, as in the previous embodiment with respect to the second retention element 142, an inclination in the oral or lingual direction. The inclination in the oral or lingual direction depends on the mounting position and is determined by the dental laboratory. Typically, however, the mounting position will be such that the retaining element 14, in the assembled state, is mounted in an oral manner rather outwardly. If a single retention element is present, then it can be logically configured in a larger way than in the case of the variant in which two retention elements are present which run in the same way in parallel. The inclination is essentially used to make a 14 "increased" recess. The inclination of the retention element is usually between 0 ° and 45 °, however it is preferably selected between 10 ° and 30 °. If, however, two retention elements are present, as in the embodiment described above, then the two retention elements can be logically provided one with a buccal inclination and the other with a lingual inclination or they can also have only one of The two are inclined. According to this, the angle α is also logically variable to a large extent. At most it does not rise however

preferably over 90 ° and preferably the angle α rises



at between 10º and 45º. Precisely in case of

configuration of the solution with two retention elements that run in the longitudinal direction, as shown in Figure 2, the length of the connecting necks 144 and 147 with different lengths is made to be able to configure due to this the heads of the elements of Retention large enough and simultaneously ensure good mass flow to form the denture superstructure.

The dental technician can find for himself even more measures both in the case of the embodiment according to Figure 2 and in the case of the embodiment according to Figure 3 to simultaneously increase retention and also to make certain adaptations of the shape in the sleeve path . This is represented symbolically in Figure 6 in which a sleeve 11 with a single retention element 14 is shown from the side. The retention element is interrupted in this case by sawing, corrosion or corresponding filing so that it is separated with recess This use in which the recess edges are formed so that they run distally and mesially, part of sleeves with retention elements that extend continuously throughout their length. If the sleeve 11 is manufactured in a mold casting process, then the recess edges 16 in the retaining element 14 are also molded directly from the beginning. However, since the dental laboratory can adapt in any case anyway, a solution is preferred in which the dental laboratory itself places the recess edges.

A preferred embodiment of the female bar mold 10 is shown in Figures 5 and 6. This again has a continuous extension, adapted to the length of the male bar mold. The sleeve 11 is also constituted in this case by two clamping walls 12, which are units with each other through the support arch 13. To increase the clamping force of the sleeve 11 by the bar 2, the clamping walls 12 are provided with stepped thickening placed on its inner side, tightening bands 121.

The sleeve 11 has mirror symmetry with respect to the longitudinal axis or with respect to the vertex line S of the support arch. Eccentrically to this vertex line S is the neck 14 " del in this case only retention element 14. The neck 14 " represents the joint to the head 14 ’of the retaining element 14. This head has another form of cross-section with respect to the examples described above. In principle, the cross-sectional shape of the head 14 ’can have any shape.

In the form represented in this case, the head has a widening that runs transversely to the

longitudinal direction, which therefore runs in the oral-lingual direction. It is striking in this case a flattening 140 of head 14 ’. This flattening 140 is preferred to avoid a notching effect under the forces which occur in occlusal direction in the superstructure. Preferably, this flattening runs from perpendicular to the occlusal direction.

The eccentric orientation of the neck 14 " of the retention element 14 is related to the path other than the palatine surfaces of the teeth. However, the eccentric arrangement of head 14 ’must be so that the head does not protrude on any side of the elongation of the clamping walls. Oral dental surfaces, exteriors run rather perpendicularly, while palatine dental surfaces run from inclined way towards the oral direction. Accordingly, in the mounted position, the retaining element 14 is arranged displaced from the palatal side. In figure 5 it would be on the left, therefore, the palatine surface.

This arrangement also leads to the recess between the sleeve and the head 14 ’on one side, usually the side

buccal, is smaller than on the palatal side, where in most cases it has more room. The female bar mold according to the invention allows the use of space in the best possible way also in case of reduced site proportions with optimal anchorage, due to its special design that can adapt properly to each superstructure.

List of reference numbers: 1 Male bar mold 2 Beam or bar 3 Fixing heads 4 Threaded hole 5 Implant A Female bar mold B Retaining sleeve or sleeve C Tightening walls D Support arch E Retention element G Retaining part G cast of models S Line of vertex of the sleeve 10 Female mold of bar 11 Sleeve 12 Walls of tightening 13 Support arch 14 Retention element 14 'Head of the single retention element 14 " Neck of the single retaining element 14 " 'Rebate 15 Recess, palatal side 16 Recess edges 121 Tightening band 140 Flattening 141 First retention element 142 Second retention element 143 Head of the first retention element 144 Neck of the first retention element 145 Lowering of the first retention element 146 Reduction of the second retention element 147 Neck of the second retention element 148 Head of the second retention element

Claims (10)

one.

Female bar mold (10) for attaching a denture superstructure to a male bar mold (1), the female bar mold comprising a sleeve (11) arched in the cross-section at least approximately U-shaped, which can be placed on the male bar mold, on which at least one retaining element (14) is arranged to hold the denture superstructure, the at least one being retaining element (14, 14 ', 14 "141; 142; ) a part formed in the sleeve with essentially occlusal orientation, characterized in that the at least one retaining element (14; 14 ', 142,) extends over the entire length of the sleeve (11) and in the cross section has the shape of a head (14 '; 143, 148) with connecting neck (14 "; 144, 147), so that the connecting neck forms on both sides a retaining recess (14 "'; 145, 146) and being formed the connecting neck of the at least one retaining element d and displaced way with respect to the vertex line of the sleeve.

2.

Female bar mold according to claim 1, characterized in that the at least one retaining element (14; 142) additionally has an oral or lingual inclination that deviates from the occlusal direction.

3.

Female mold of bar according to claim 2, characterized in that the difference in inclination of the at least one retaining element (14; 142) with respect to the occlusal direction, is between 0 ° and 45 °, preferably between 10 ° and 30 °.

Four.

Female bar mold according to claim 1, characterized in that it has two parallel retention elements (141, 142), which extend over the entire length of the sleeve (11), which both have essentially an occlusal orientation with respect to each other. at an angle (α).

5.

Female bar mold according to claim 4, characterized in that the angle (α) between the two retention elements (141, 142) is a maximum of 90 °, this angle being preferably between 10 ° and 45 °.

6.

Female bar mold according to claim 4, characterized in that the two retaining elements (141, 142) have in the cross section the shape of a head (143, 148) with a connecting neck (144, 147).

7.

Female bar mold according to claim 6, characterized in that the length of the connecting necks (144, 147) is different.

8.

Female bar mold according to claim 1, characterized in that the head of the bar element has a flatness that extends over the entire length.

9.

Female bar mold according to claim 8, characterized in that the flattening runs perpendicular to the occlusion direction.

10.

Female bar mold (10) according to one of claims 1 to 9, characterized in that the at least one retaining element (14; 141, 142) extending over the entire length of the sleeve (11) is provided, in one or more sites, with recess edges (16) perpendicular to the longitudinal direction of the retaining element.