Holder for producing a replica of a denture

Abstract

Holder for use in the production of a replica of a dental prosthesis, characterized in that the holder (10) has a first holder part (12) and a second holder part (14), wherein the first holder part (12) and the second holder part (14) are movable relative to one another on a fixed path along a plug-in direction (S) and are displaceable from a remote position to an assembled end position, and wherein the first holder part (12) and the second holder part (14) each have a recess (44) for receiving a handle (46) of an impression tray (16).

Description

The invention relates to a holder for use in the production of a replicate of a dental prosthesis.Dental prostheses which are used to replace individual teeth or even an entire denture generally comprise a gum part which is formed from plastic and bears against the jaw (upper jaw or lower jaw) of a patient. In addition, the prosthesis usually comprises at least one tooth, which is likewise made of plastic. The gingival part and the at least one tooth are then connected and together form the complete dental prosthesis.In dental prostheses, it is important that these fit the patient well. For this purpose, the dental prostheses must on the one hand be well adapted to the jaw and in particular to the jawbones, and on the other hand a dental prosthesis must also have a good fit and be pleasant to wear during all movements of the jaw, the tongue, the cheeks, the lips, etc. In addition, the dental prosthesis is to be adapted to the relative position of the lower jaw and upper jaw.However, dentures made one-time-expensive-are subject to wear and discolorations during use, so that they usually have to be replaced after a certain time.Usually, a completely new dental prosthesis is then produced which-in order to meet the above-mentioned conditions-is usually produced with the following steps: a) taking an impression from the upper and / or lower jaw (depending on where the prosthesis is to be produced) and producing a plaster model of the upper and / or lower jaw. The plaster model is usually produced in the dental laboratory. b) Based on the plaster model, a so-called individual (impression) spoon is then prepared for the patient, which already takes into account the size of the upper and / or lower jaw. This impression tray is generally made of light-curing plastic c) A functional impression is carried out by means of the individual tray, wherein the individual tray is provided with addition-crosslinking polyvinylsiloxane and is inserted into the mouth of the patient, and the patient carries out a plurality of dynamic movements, wherein the mucosa and the muscles of the upper jaw and / or lower jaw leave a characteristic impression in the material. d) Based on the functional impression, a plastic base is now produced which is already matched to the upper jaw and / or lower jaw. e) The plastic base is now provided with a wax wall and a so-called bite registration is taken, In order to determine the relative position of upper jaw and lower jaw. f) The new dental prosthesis is subsequently produced on the basis of the function imprint and the bite registration.If the above-mentioned complicated procedure is to be omitted and a denture is already present, the first two steps for manufacturing the individual spoon can be omitted and the present denture can be used as an individual spoon for carrying out the functional test and the bite registration. However, this has the disadvantage that the existing dental prosthesis must then remain in the laboratory in order to produce the final dental prosthesis in conjunction with the information from the function imprint and the bis-registry. In order to return the existing prosthesis to the patient as quickly as possible, the corresponding work must be prioritized in the laboratory for this purpose, as a result of which the normal workflow is interrupted.The known methods described above for producing a dental prosthesis have the disadvantage, among other things, that they either last very long and require the presence of a patient at several deadlines. In the case that the existing dental prosthesis is used, the patient has to do without the existing dental prosthesis for several (1-2 depending on the workload of the technician) days.The underlying object of the invention is therefore to provide a holder for use in the production of a replicate, by means of which a replicate of a dental prosthesis can be produced in a simple manner.The holder for use in the manufacture of a replicate has a first holder part and a second holder part, the first holder part and the second holder part being relatively movable relative to each other on a fixed path and being displaceable from a remote position to a composite end position. The first holder part has a recess for receiving a handle of an impression tray and the second holder part also has a recess for receiving a handle of an impression tray.In this case, a replicate is understood to mean essentially a copy of an already present dental prosthesis.Thus, the holder serves on the one hand for fixing two impression spoons with which a negative impression of an existing prosthesis and subsequently a replicate blank can be produced and on the other hand for defining the defined path on which the impression spoons can be moved relative to one another up to an end position.The depressions are in particular each adapted to standard handles of impression spoons and have in particular a rectangular shape, wherein in particular the width of the inlet opening of the depression is smaller than the length (depth extension) of the depression. In particular, the width of the depression is between 15 cm and 25 cm, and preferably between 18 cm and 20 cm, and in particular 19.5 cm. The length of the depression is in particular between 25 cm and 35 cm, and preferably between 28 cm and 32 cm, and particularly preferably 30 cm. The height of the depression is in particular between 0.8 cm and 1.3 cm. With these dimensions, conventional impression spoons can be stably accommodated in the depression with their handle.In particular, the holder has two mutually corresponding interconnectable elements for defining the fixed track. The connecting elements are in particular designed in the manner of a plug connection and have a plug receptacle and a plug element. The connecting elements can be inserted into one another in a plug-in direction S.In particular, the plug-in receptacle is designed as an elongate projection and has a receiving opening which is designed such that the plug-in element can be inserted in the receiving opening in a positive-locking manner. In particular, the receiving opening has a square outer contour and the plug element is designed as an elongate projection with a square cross section. A rotation during the plug-in movement is thereby avoided. Alternatively to a square cross-section, other cross-sections are also possible which effectively avoid twisting, such as any polygons.To define the end position, the first holder part and / or the second holder part have a stop. The first holder part and the second holder part can be moved towards each other in the plug-in direction S until the end position is reached by striking at least one of the stops.The stop of the first holder part and / or the stop of the second holder part is formed in particular by a base plate adjoining the connecting element. The base plate extends in particular in a direction transverse and in particular perpendicular to the plug-in direction S. In particular, the second holder part with the plug-in element has a base plate as a stop, which in the end position abuts against the end face of the plug-in element surrounding the receiving opening.In a practical embodiment of the holder, the first holder part and / or the second holder part has a support section for supporting an impression tray against tilting. The support section extends in particular in a plane perpendicular to the plug-in direction S. The support section is in particular part of a base plate and extends in a plane with the base plate. The support section is provided for the purpose that, when the first holder part and the second holder part are inserted into one another with impression spoons and impression material, the impression spoons are not pushed apart but stably assume the end position.The support section can have a trapezoidal base surface in particular. In particular, a side length of a side facing the connecting element is shorter than a side length of a side facing away from the connecting element. The support section is thus adapted to the widening shape of an impression tray.The support section of the first holder part and / or of the second holder part has, in particular, an abutment elevation at its end facing away from the connecting element. The elevation serves in particular to compensate for a difference in height in the rear side of the impression tray; the handle is usually welded to the rear side of the tray section and therefore the rear side of the impression tray is not planar. As a result of the contact elevation, the two impression spoons in the holder are aligned parallel. The contact elevation is in particular designed as a rib.The depression for positioning the handle of the impression tray is formed in particular between the base plate and a connecting element, i.e. either the plug-in receptacle or the plug-in element. The depression extends in particular in a plane parallel to the base plate.The base plate extends in particular in a plane transversely and in particular perpendicularly to the plug-in direction (S). In particular, a connection section and the support section thus extend transversely to the plug-in direction S.In a further practical embodiment, the first holder part and / or the second holder part are formed in multiple parts. In particular, the first holder part and / or the second holder part comprise the base plate and the respective connecting element. The base plate and the connecting element are each glued to one another. The base plate is designed identically in particular for the first holder part and the second holder part, so that particularly simple production is made possible.Alternatively, it is also possible to produce the base plate and the connecting element in one piece.The base plate has in particular a connection section for positioning and connecting the respective connecting element. The connecting section has an edge elevation in particular on the surface and positioning elements for the clear positioning of the connecting elements. In particular, quarter circles can be provided as positioning elements at two adjacent corners.In a further practical embodiment, the holder is made of plastic. In particular, the various parts of the holder can be produced by means of plastic injection molding and / or by 3D printing.The holder can serve in particular for use in a following method for producing a replicate of a dental prosthesis: a) providing an already present dental prosthesis. This is the dental prosthesis to be replaced. The patient is already accustomed to this. b) Production of a negative impression of the existing dental prosthesis by positioning the existing dental prosthesis between two impression spoons filled with impression material, wherein the spoons are positioned in a predetermined relative position by means of the holder. In particular, the existing dental prosthesis is first pressed into the impression material in an impression tray with a first side or first half, and then the second impression tray is brought up to the first impression tray for the purpose of also impression of the second side or second half, c) removing the existing dental prosthesis from the impression material and the trays. The removal or removal of the existing dental prosthesis takes place in particular only after the molding material has cured. For removal, the two impression spoons are in particular removed from each other again. The filling of the remaining cavity with filling material is then carried out in order to produce a replicate blank, wherein the two impression cups are positioned again in the predetermined relative position. d) Carrying out a functional impression, wherein an impression compound is applied to the side of the replicate blank facing the jaw. For the function molding, the replicate blank is inserted into the patient and the patient performs dynamic movements. In the impression material, a characteristic impression is produced during dynamic movements of the patient. Alternatively or preferably additionally, bite registration is carried out, wherein an impression compound is applied to the tooth side of the replicate blank and the patient guides the jaws towards one another and bitts them. e) Finally, the replicate - i.e. the new denture - is produced on the basis of the replicate blank using the functional impression and / or the bite registration.Overall, the existing dental prosthesis is therefore first shaped and doubled and a replicate blank is produced. For this purpose, rapidly moldable and curable, but nevertheless cost-effective, plastics are used. Subsequently, the replicate blank can be used for the final fabrication of the new dental prosthesis, i.e. the replicate.This method offers several advantages to the patient; he does not have to perceive frequent deadlines in practice, nor does he have to do without his existing dental prosthesis over a longer period of time. By copying the existing dental prosthesis, the new dental prosthesis is a replicate which reaches as close as possible to the old dental prosthesis and which is particularly pleasant for the patient and does not produce a new feel or a feeling of disturbance.A further advantage is, as explained below, that the method predominantly uses materials that are available as standard in dentist practice and only a suitable holder for the spoons is optionally additionally required.In step b), the impression spoons are moved towards each other on a defined path for producing the negative impression and are positioned relative to each other by means of the holder in a defined end position at a defined distance. In particular, after the moulding material has cured, the two moulding spoons are moved apart again on the same fixed path, so that the existing dental prosthesis can be removed. The defined path and the defined relative position are predefined by the holder. This ensures reproducibility of the movement and of the end position.To produce the replicate blank, the impression spoons are in step c) in particular fed onto one another again on the same defined path and brought into the same relative position. The exact repetition of the movement is realized in particular by the holder. Overall, this ensures as far as possible that the replicate blank corresponds to the existing dental prosthesis.The negative impression is produced in step b), in particular, by means of alginate as the impression material. Alginate is inexpensive and permits precise impression. In addition, it does not bond to other materials in the cured state. The replicate blank in step c) is produced in particular from plastic, such as a prosthesis plastic (e.g. PalaPress®), or from a silicone-based material (e.g. StoneBite® or Smart-Bite®). These are each materials which are part of the standard equipment in dentist practice.In particular, the impression material cures in step b) between 1 min and 10 min and preferably between 1 min and 3 min, and the impression spoons can be separated again after this time has elapsed. The filling material in step c) cures in particular in a time period between 3 min and 25 min and preferably in a time period between 3 min and 15 min, so that a solid replicate blank is then produced.Further practical advantages and examples are explained below in conjunction with the figures. They show FIG. 1 shows a holder with a first holder part and a second holder part arranged separately therefrom, each with an impression tray arranged thereon, in a perspective view, FIG. 2 shows the holder from FIG. 1 in a assembled position in a second side view, FIG. 3 shows the first holder part in a perspective view, FIG. 4 shows the second holder part in a perspective view, FIG. 5 shows a base plate of the holder in a perspective view, FIG. 6 shows a plug-in receptacle in a perspective view, FIG. 7 shows a plug element in a perspective view, FIG. 8 shows an illustration of a first method step with an existing dental prosthesis and a first holder part, FIG. 9 shows an illustration of a further method step with a holder according to FIG. 1, and FIG. 10 shows an illustration of a further method step with a replicate blank in the mouth.In connection with Figures 1 to 7, a holder 10 for use in the production of a denture replicate is explained below.The holder 10 has a first holder part 12 and a second holder part 14. As can be seen clearly in FIGS. 1 and 2, the first holder part 12 and the second holder part 14 each serve to receive an impression tray 16.The first holder part 12 comprises a base plate 18 and a connecting element 20 in the form of a plug-in receptacle 22 having a receiving opening 24 (cf. FIGS. 3 and 5 ). The plug-in receptacle 22 is formed by an elongated base body with a receptacle opening 24 with a rectangular outer contour.The second holder part 14 comprises a base plate 18 and a connecting element 20 in the form of a plug element 26 (cf. FIGS. 4 and 5 ). The plug element 26 is designed as an elongate projection with a square cross section, which can be received in the receiving opening 24.The base plate 18 is designed as a flat base body and has a connecting section 28 for the respective connecting element 20. The connecting section 28 is square and has a circumferential elevation 30 - forming a U - on the outer sides. The respective connecting element 20 is arranged on the elevation 30 (cf. FIGS. 3 and 4 ).To form a positive fit between the base plate 18 and the respective connecting element 20, the base plate 18 has projections 32 designed as a quarter circle at two corners. The plug-in receptacle 22 has corresponding circular-segment-like recesses 34. The recesses 34 are formed over the entire length of the plug receptacle 22, so that the plug receptacle 22 can be arranged in two orientations on the base plate 18. The plug element 26 has a base plate 36, wherein the base plate has recesses 38 corresponding to the projections 32.The base plate 18 further has a support section 40 adjoining the connection section 28. The support section 40 is trapezoidal and has a greater width at the end remote from the connection section 28 than adjacent to the connection section 28.The connecting elements 20 are each placed on the U-shaped circumferential elevation 30, and a depression 44 is formed between the respective connecting element 20 and the base plate 18 or between the respective connecting element 20 and the connecting section 28, which depression serves to receive a handle 46 of an impression tray 16, as can be seen from a viewing together of FIGS. 3 and 1.The first holder part 12 and the second holder part 14 are of substantially the same construction and each have an identically formed base plate 18 with a connection portion 28 and a support portion 30 and each have a connecting element 20.The holder 10 is designed such that the first holder part 12 and the second holder part 14 can be detached from one another, as can be seen in the detached position in FIG. 1, and can be brought into a fitted position, as can be seen in the position in FIG. 2. For this purpose, the first holder part 12 and the second holder part 14 have the connection elements 20 corresponding to one another in each case in the manner of a plug connection.The plug connection is produced by the plug element 26 being inserted into the receiving opening 24 of the plug receptacle along a plug direction S. The square cross section of the receiving opening 24 and the plug element 24 counteracts a rotation of the first holder part 12 and the second holder part 14 and the plug connection is produced on a fixed path.The first holder part 12 and the second holder part 14 can be inserted into one another until a defined end position is reached (cf. FIG. 2 ). The defined end position is reached when the base plate 36 of the second holder part 14 as a stop 48 abuts against the end face 50 surrounding the receiving opening 24.In a direction perpendicular to the plug-in direction S, the base plate 18 extends in each case on the first holder part 12 and likewise on the second holder part 14.In the following, in conjunction with FIGS. 8 to 10, a method for producing a replicate of a dental prosthesis using a holder 10 described above will be explained.In FIG. 8, the first holder part 12 is shown with an impression tray 16, wherein impression material 52 is filled into the impression tray 16 and an existing dental prosthesis 54 is inserted. The first holder part 12 and the second holder part are guided into the end position in which two impression spoons 16 filled with impression material 52 are arranged in the predetermined end position, with the existing dental prosthesis 54 positioned therebetween, in order to create a negative impression of the existing dental prosthesis 54.The impression cups 16 are now brought back into the predetermined end position by means of the holder 10, wherein the cavity which has been produced by the removal of the existing dental prosthesis 54 is filled with filling material 56 (cf. FIG. 9 ). The filling material 56 now forms the replicate blank 58, which can be seen in FIG. 10.In FIG. 10, two replicate blanks 58 aand 58 bcan be seen, wherein one replicate blank 58 ais arranged in an oral cavity 62 on the upper jaw 64 and the replicate blank 58 bis arranged on the lower jaw 66. In each case, impression compound 60 is applied to the side of replicate blank 58 a, 58 bfacing respective jaw 64, 66 in order to carry out the functional impression. In addition, an impression compound 60 is applied to the side of the replicate blank 58 a, 58 bfacing the respectively opposite jaw 64, 66, in order to carry out the bite registration.List of reference characters10 Holder 12 First holder part 14 Second holder part 16 Impression tray 18 Base plate 20 Connecting element 22 Plug-in receptacle 24 Receiving opening 26 Plug-in element 28 Connecting portion 30 Elevation 32 Projection 34 Recess (plug-in receptacle) 36 Base plate 38 Recess (base plate) 40 Support portion 42 Contact elevation 44 Depression 46 Handle 48 Stop 50 End face 52 Impression material 54 Existing dental prosthesis 56 Filling material 58 Replicate blank 60 Impression material 62 Oral cavity 64 Upper jaw 66 Lower jaw

Claims

Holder for use in the production of a replicate of a dental prosthesis, characterized in that the holder (10) has a first holder part (12) and a second holder part (14), wherein the first holder part (12) and the second holder part (14) are relatively movable with respect to one another on a defined path along a plug-in direction (S) and are displaceable from a remote position into a assembled end position, and wherein the first holder part (12) and the second holder part (14) each have a depression (44) for receiving a handle (46) of an impression tray (16).Holder according to the preceding claim, characterized in that the fixed path is formed by two corresponding interconnectable elements (20, 22, 26).Holder according to one of the preceding claims, characterized in that the first holder part (12) and / or the second holder part (14) have a stop (48) for defining the end position.Holder according to one of the preceding claims, characterized in that the first one holder part (12) and / or the second holder part (14) have a support section (40).Holder according to one of the preceding claims, characterized in that the depression (44) is formed between a connecting element (20) and a base plate (18).Holder according to one of the preceding claims, characterized in that a base plate (18) extends transversely with respect to the plug-in direction (S).Holder according to one of the preceding claims, characterized in that the first holder part (12) and / or the second holder part (14) are formed in multiple parts.

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