METHOD FOR POSITIONING PROSTHETIC TEETH IN A DENTURE BASE
20180147036 ยท 2018-05-31
Inventors
Cpc classification
A61C13/0004
HUMAN NECESSITIES
A61C13/1009
HUMAN NECESSITIES
A61C13/01
HUMAN NECESSITIES
International classification
Abstract
The invention relates to a method for the positioning of prosthetic teeth in a denture base, wherein at least one respective recess is provided in the basal side of the prosthetic teeth and/or a plurality of recesses are provided in the denture base in the surface pointing in the occlusal direction, wherein the prosthetic teeth are connected to the denture base by inserting pins into the recesses, wherein the pins are arranged at the basal side of the prosthetic teeth and/or in the occlusal direction on the denture base and/or the pins are connected as separate retaining pins to the prosthetic teeth and the denture base, wherein the pins have engaging means and the recesses have corresponding counter engaging means, such that, during insertion, the pins lock with the recesses in such a way that the prosthetic teeth are pulled by a mechanical tension against the denture base and connected to the denture base.
The invention also relates to a prosthetic tooth, a set of prosthetic teeth and a denture base for carrying out the method.
Claims
1. A method for the positioning of prosthetic teeth in a denture base, comprising providing at least one respective recess in a basal side of the prosthetic teeth and/or providing a plurality of recesses in the denture base in a surface pointing in an occlusal direction, wherein the prosthetic teeth are connected to the denture base by inserting pins into the recesses, wherein: the pins are arranged at the basal side of the prosthetic teeth and/or in the occlusal direction on the denture base and/or the pins are connected as separate retaining pins to the prosthetic teeth (2) and the denture base (1), and the pins have engaging means and the recesses have corresponding counter engaging means, such that, during insertion, the pins lock with the recesses in such a way that the prosthetic teeth are pulled by a mechanical tension against the denture base and connected to the denture base.
2. The method according to claim 1, wherein during insertion of the pins into the recesses, the prosthetic teeth are fixed in the denture base without any play.
3. The method according to claim 1, wherein the recesses are cylindrical apart from the counter engaging means.
4. The method according to claim 1, wherein the recesses and the pins exhibit forms which fit one another.
5. The method according to claim 1, wherein each pin and each recess exhibits a distinctive form, such that in each case only one pin fits each recess.
6. The method according to claim 1, wherein the recesses and the pins are not rotationally symmetrical.
7. The method according to claim 1, wherein the counter engaging means are arranged on a lateral surface of the recesses, and the engaging means are arranged on a lateral surface of the pins.
8. The method according to claim 7, wherein the engaging means are formed by projections, and the counter engaging means are formed by engagement recesses or engagement projections.
9. The method according to claim 1, wherein the recesses and/or the pins in the denture base are arranged in receiver surfaces for the prosthetic teeth.
10. The method according to claim 1, wherein to carry out a test fitting, the prosthetic teeth are detachably connected to the denture base.
11. The method according to claim 1, wherein the denture base and/or the prosthetic teeth are produced as one piece with the recesses or with the recesses and the pins by a CAD/CAM process.
12. The method according to claim 1, wherein an intermediate space between the recesses and the associated pins is selected in such a way, or produced in such a way, that a defined quantity of adhesive is adsorbed when the pins are locked with the recesses.
13. The method according to claim 1, wherein the engaging means are arranged at the pins and the counter engaging means are arranged at the recesses in such a way that the prosthetic teeth can only be connected to the denture base in a specific orientation.
14. The method according to claim 1, wherein in each case one pin is arranged at basal ends of the prosthetic teeth, and a plurality of recesses (26) are arranged in the denture base (1), wherein preferably plugs are provided on lateral surfaces of the pins as engaging means and grooves are provided on the lateral surfaces as counter engaging means.
15. A method for producing a dental prosthesis, comprising positioning the prosthetic teeth in the denture base by a method according to claim 1, wherein the prosthetic teeth are adhesively bonded to the denture base.
16. A prosthetic tooth for the implementation of a method according to claim 1, wherein the prosthetic tooth comprises at a basal end at least one pin with an engaging means or at least one recess with a counter engaging means.
17. A set of prosthetic teeth with a plurality of different prosthetic teeth according to claim 16.
18. A denture base for the implementation of a method according to claim 1, wherein the denture base comprises, in the surface pointing in the occlusal direction, at least one pin with an engaging means and/or at least one recess with a counter engaging means.
19. The method according to claim 3, wherein the recesses exhibit a straight cylindrical geometry apart from the counter engaging means.
20. The method according to claim 6, wherein the recesses and the pins do not exhibit any rotational symmetry axis.
21. The method according to claim 8, wherein the engaging means are formed by beads, grooves, spherical sections, or hooks, and the counter engaging means are formed by grooves or by negative forms of the engaging means.
22. The method according to claim 9, wherein the recesses and/or the pins in the denture base are arranged in receiver recesses for the prosthetic teeth, wherein the receiver recesses form negatives of the basal ends of the prosthetic teeth.
23. A method for producing a dental prosthesis, comprising positioning the prosthetic teeth in the denture base by a method according to claim 15, wherein the prosthetic teeth are adhesively bonded to the denture base after the test fitting.
24. A denture base for the implementation of a method according to claim 18, wherein the at least one pin and/or the at least one recess is or are arranged in a receiver surface or in a plurality of receiver surfaces for prosthetic teeth.
Description
[0054] Hereinafter exemplary embodiments of the invention are explained on the basis of five schematically represented figures, but without thereby restricting the invention, wherein:
[0055]
[0056]
[0057]
[0058]
[0059]
[0060]
[0061] In the figures, in the case of different embodiments, the same reference numerals are used in part for parts of the same type, in particular for engaging means of the same type but differing in detail. Sectionally cut surfaces are represented as shaded sections in the figures.
[0062]
[0063] Provided at the pin 12 is an engaging means 14, which engages in a counter engaging means 16 in the recess 6 when the pin 12 is inserted fully into the recess 6. The pin 12, the engaging means 14, and the denture base 1, are made of one piece from a pink-colored plastic such as, for example, PMMA (polymethyl methacrylate), and preferably produced by means of a CAD/CAM process. The engaging means 14 is arranged as a spherical section on the surface of the pin 12, and projects over the cylindrical lateral surface of the pin by 0.01 mm to a maximum of 1 mm, preferably by 0.05 mm to 0.4 mm. The counter engaging means 16 is correspondingly a hollow form which can receive the engaging means 14, preferably an engagement recess 16 in the form of the negative of the spherical section of the engaging means 14. Specifically, a rotation of the prosthetic tooth 2 in the denture base 1 about the cylindrical axis of the pin 12 or of the recess 6 respectively is no longer automatically possible, and the intermediate space between the assembled prosthetic tooth 2 and the denture base 1 remains small. For the definitive securing of the orientation of the prosthetic tooth 2 in the denture base, use can also be made of a specific form of the receiver surface 10, onto which the prosthetic tooth 2 is to be placed in flush contact connection in only one specific orientation.
[0064] The engaging means 14 at the pin 12 and the pin 12 itself, and, to a lesser extent also the prosthetic tooth 2, and therefore the recess 6, are elastically deformable, such that the pin 12 is insertable, with the engaging means 14, into the recess 6, in that the engaging means 14 are elastically compressed. As soon as the engaging means 14 engage into the counter engaging means 16, the compressed engaging means 14 is relaxed (not necessarily completely, or preferably not completely), and to a slight degree the expanded recess 6 also relaxes. The engaging means 14 is in this case arranged at a slightly lesser height at the pin 12 than the counter engaging means 16 in the recess 6. As a result, the engaging means 14 cannot relax entirely, and the residual tension draws the prosthetic tooth 2 in the direction of the denture base 1. Already sufficient for this is a height difference between the engaging means 14 and the counter engaging means 16 of 0.1 mm, but it is also possible, depending on the geometry of the engaging means 14 and of the counter engaging means 16, for greater height differences to also be selected.
[0065] In order for the mechanical tension to build up, the engaging means 14 and the counter engaging means 16 are configured with surfaces inclined towards one another, which in the present case are realized by the roundings of the spherical sections. Due to the rounded form of the engaging means 14 and of the counter engaging means 16, no further element exerting a mechanical tension or a mechanical traction is required.
[0066] For the final securing of the prosthetic tooth 2 in the denture base 1, first an adhesive (not shown) is inserted into the recess 6 and/or applied onto the pin 12. The correct seating of the prosthetic tooth 2 during the hardening of the adhesive (for example a PMMA cement (polymethyl methacrylate cement or another two-component adhesive) is guaranteed by the mechanical tension which the engaging means 14 and the counter engaging means 16 exert on one another. As soon as the adhesive has hardened, the prosthetic tooth 2 is secured and the dental prosthesis assembled. Surplus adhesive can be removed before and/or after the hardening of the adhesive. In this situation it is of advantage if the free volume between the prosthetic tooth 2 and the denture base 1 is precisely defined by the seating, and therefore the volume of adhesive required is precisely known. Nevertheless, the adhesive is preferably used to a small degree in surplus, in order to ensure that no cavities or gaps remain between the prosthetic tooth 2 and the denture base 1 which are not filled with adhesive. Likewise, the dental prosthesis can be polished after the hardening of the adhesive, in order to obtain a better visual impression.
[0067] Before the final connection, the prosthetic tooth 2 can be separated from the denture base 1 again by the application of suitable force. This can be helpful, for example, in order to test the seating of the dental prosthesis which has been provisionally assembled in this way on the patient (referred to as a test fit). If necessary, the prosthetic tooth 2 can be ground slightly at the basal side to achieve a better fit, provided that this does not incur the complete loss of the mechanical tension between the denture base 1 and the inserted prosthetic tooth 2.
[0068] Provided in front and behind the prosthetic tooth 2, shown in section, are further prosthetic teeth (not shown), which are connected in the same way or with an alternative method according to the invention to the denture base 1, such that, with the prosthetic tooth 2, the other prosthetic teeth, and the denture base 1, a partial dental prosthesis or a full dental prosthesis can be produced.
[0069]
[0070] Provided at the pin 32 is an engaging means 34, which engages in a counter engaging means 36 in the recess 26 when the pin 32 is inserted entirely into the recess 26. The pin 32, the engaging means 34, and the prosthetic tooth 2 are made as one piece from a tooth-colored plastic such as, for example, PMMA. The denture base 1 is made as one piece from a pink-colored plastic such as, for example, PMMA, and is preferably produced by means of a CAD/CAM process. The engaging means 34 is arranged as a circumferential bead on the surface of the pin 32 in the region of the tip of the pin 32 (bottom in
[0071] The engaging means 34 at the pin 32 and the pin 32 itself, as well as, to a lesser degree also the prosthetic tooth 2 and therefore the recess 26, are elastically deformable, such that the pin 32 with the engaging means 34 is insertable into the recess 26, elastically compressing the engaging means 34. As soon as the engaging means 34 engages into the counter engaging means 36, the compressed engaging means 34 relaxes (not necessarily completely, or preferably not completely), and to a slight degree also the expanded recess 26. The engaging means 34 is in this situation arranged at a slightly lesser height at the pin 32 than the counter engaging means 36 in the recess 26. As a result of this, the engaging means 34 cannot relax entirely, and the remaining mechanical tension draws the prosthetic tooth 2 in the direction of the denture base 1. For this purpose, a height difference between the engaging means 34 and the counter engaging means 36 of 0.1 mm is sufficient, but, depending on the geometry of the engaging means 34 and of the counter engaging means 36, greater height differences can also be selected.
[0072] In order for the mechanical tension to be able to build up, the engaging means 34 and the counter engaging means 36 are configured with surfaces inclined towards one another due to the rounding. Due to the rounded shape of the engaging means 34 and of the counter engaging means 36 no further element is required to produce a mechanical tension.
[0073] For the final securing of the prosthetic tooth 2 in the denture base 1, first an adhesive (not shown) is introduced into the recess 26 and/or applied onto the pin 32. The correct seating of the prosthetic tooth 2 on the hardening of the adhesive (for example a PMMA cement or another two-component adhesive) is ensured by the mechanical tension which the engaging means 34 and the counter engaging means 36 exert on one another. As soon as the adhesive has hardened, the prosthetic tooth 2 is secured and the dental prosthesis assembled. Surplus adhesive can be removed before and/or after the hardening of the adhesive. In this situation it is of advantage if the free volume between the prosthetic tooth 2 and the denture base 1 is precisely defined by the seating, and therefore the volume of adhesive required is precisely known. Nevertheless, the adhesive is preferably used in a slight amount in excess, in order to ensure that no cavities or gaps remain between the prosthetic tooth 2 and the denture base 1 which are not filled with adhesive. Likewise, the dental prosthesis can be polished after the hardening of the adhesive in order to obtain a better visual impression.
[0074] Before the final connection, the prosthetic tooth 2 can be separated from the denture base 1 again by the application of suitable force. This can be helpful, for example, in order to test the seating of the dental prosthesis which has been provisionally assembled in this way on the patient. If necessary, the prosthetic tooth 2 can be ground slightly at the basal side to achieve a better fit, provided that this does not incur the complete loss of the mechanical tension between the denture base 1 and the inserted prosthetic tooth 2.
[0075] Provided in front of and behind the prosthetic tooth 2, shown in section, are further prosthetic teeth (not shown), which are connected in the same way or with an alternative method according to the invention to the denture base 1, such that, with the prosthetic tooth 2, the other prosthetic teeth, and the denture base 1, a partial dental prosthesis or a full dental prosthesis can be produced.
[0076]
[0077] The connection of the left prosthetic tooth 2 (on the left in
[0078] The right prosthetic tooth 2 (on the right in
[0079] The mechanical tension can be exerted by the elasticity of the retaining pin 52 and/or by additional elastic elements (not shown).
[0080] For the correct orientation of the prosthetic teeth 2 and in order to connect the prosthetic teeth 2 to the denture base 1 with the aid of adhesive, reference is made to the embodiment in
[0081]
[0082] The second pin, shown in
[0083] The third pin, shown in
[0084] The fourth pin, shown in
[0085] The fifth pin, shown in
[0086] Described briefly hereinafter is how, with such pins according to
[0087] In the middle of a receiver recess of a denture base, a pin according to
[0088] The optimum structural design and positioning in the CAD process can take place before a correction, optimally after a correction, after a test fitting. The cylinder (the pin) can also be provided on the basal surface of the prosthetic tooth, and the recess on the denture base.
[0089] Small holes on the securing surface of the prosthetic teeth and the denture base can allow for surplus securing compound (adhesive) to escape, such that the prosthetic teeth are in fact locked at the desired height relative to the denture base.
[0090]
[0091]
[0092] With the mechanically tensioned connection represented in
[0093] The exemplary embodiment according to
[0094] As well as the engagement arrangements shown with
[0095] The features of the invention disclosed in the foregoing description as well as in the claims, figures, and exemplary embodiments can be essential, both individually and in any desired combination, for the realization of the invention in its different embodiments. It is understood that the device for the numbers of prosthetic teeth 2 shown, in addition to the exemplary embodiments shown, is transferable without further ado to other quantities of prosthetic teeth 2, wherein the full set of fourteen prosthetic teeth 2 per denture base 1 is preferred for a full dental prosthesis according to the invention.
LIST OF REFERENCE NUMERALS
[0096] 1 Denture base [0097] 2 Prosthetic tooth [0098] 4 Basal end of the prosthetic tooth [0099] 6 Recess [0100] 8 Surface of the denture base aligned towards the occlusion plane [0101] 10 Receiver surface/receiver recess [0102] 12 Pin [0103] 14 Engaging means/projecting spherical section [0104] 16 Counter engaging means/engagement recess as spherical section [0105] 26 Recess [0106] 32 Pin [0107] 34 Engaging means/projecting circumferential bead [0108] 36 Counter engaging means/engagement recess as ring-shaped groove [0109] 38 Engaging means/engagement recess as ring-shaped groove [0110] 39 Counter engaging means/projecting circumferential bead [0111] 46 Recess [0112] 47 Recess [0113] 52 Retaining pin [0114] 54 Engaging means/projecting hook [0115] 56 Counter engaging means/cut-out opening [0116] 57 Counter engaging means/cut-out opening [0117] 64 Engaging means/projecting engaging means [0118] 65 Engaging means/engagement recess [0119] 66 Engaging means