Impression manufacturing system for manufacturing detachable dentures

Abstract

The invention relates to an impression system for producing dental prostheses for persons without teeth completely or without teeth in a single jaw, said system essentially comprising an upper template (1) having a cavity (1.1) capable of receiving impression material and adapted to the upper jaw of a patient, and / or a lower template (2) having a cavity (2.1) capable of receiving impression material and adapted to the lower jaw of the patient. The upper template (1) or the lower template (2) is provided with a cavity capable of containing impression material and adapting to the lower jaw of the patient, and the upper template (1) or the lower template (2) is provided with a positioning device in the oral cavity of the patient.

Description

Technical Field

[0001] As the title of the invention indicates, the present invention belongs to the technical field of dentistry, specifically to the technical field related to manufacturing detachable dentures.

[0002] More specifically, the system of the present invention is intended to create dentures for edentulous people (i.e., those who do not have any teeth of their own and therefore require complete dentures or prostheses) as well as those who are monodentate (i.e., those who have only one jaw with their own teeth). Background Art

[0003] Removable dental prostheses (also known as dentures) are external components whose function is to replace missing teeth and periodontal tissues that patients lose over time.

[0004] These dentures with artificial teeth allow, on the one hand, correct chewing of food and preservation of oral aesthetics and ease of speaking, and, on the other hand, oral hygiene, since these dentures can be cleaned while placed in the mouth and can also be easily removed from the mouth for the deepest and most thorough cleaning tasks.

[0005] These dentures are also a cheaper and less invasive alternative to known non-removable dental implants, which are inserted into the patient's bone bed via screws and therefore require surgery and time for healing, osseointegration, etc.

[0006] As for removable dentures, generally two main types of dentures can also be distinguished, based on the number of teeth they comprise. Thus, one of the two main types of dentures is intended for cases where the patient has his own tooth pieces without a fully formed dental arch, so that in this case the denture is fastened using natural tooth pieces with the help of more or less complex crimping systems, depending on the case.

[0007] On the other hand, another type of denture would be a denture with all the upper or lower teeth (usually 14 teeth in the upper denture and the same number of teeth in the lower denture) so that it rests and fully engages on the corresponding gums. This is the case of dentures required for patients who are called single jaw edentulous or completely edentulous.

[0008] Until now, the process of making this type of denture for people who are edentulous (either in one jaw or completely edentulous) has been somewhat laborious, mainly for two reasons. The first reason is of a technical nature: the complexity caused by the lack of a reference in the patient's mouth that would facilitate the correct design of the denture allowing for a correct posterior positioning in the mouth, and secondly, another reason is of a scheduling / temporary nature: because in order to correctly perform the method, the patient needs to make several visits to the clinic to collect data, design and adjust the denture.

[0009] As an example, the conventional workflow to date for making dentures for completely toothless people is as follows:

[0010] At the first visit, the patient goes to the clinic for the first time, where, in addition to the diagnosis, a simulated impression of the patient's mouth is obtained using any known technique. This impression is then sent to the laboratory to make a personalized tray to obtain a wax bite edge from the patient's bite.

[0011] -The patient then goes to the clinic a second time, where a bite registration is taken with the help of a personalized tray. The color of the teeth is also recorded if it has not been chosen at that time. Both the bite registration and the color registration are then sent back to the laboratory, where the professionals proceed with sculpting the teeth and mounting them on the template.

[0012] -The template is sent back to the clinic where the patient has a third visit to be tested and checked for correct occlusion, esthetics, centric relationship, vertical dimensions, and phonation.

[0013] - If everything is correct, the template is sent back to the laboratory where the denture is obtained by conventional moulding and injection moulding or injection moulding, as well as final grinding and polishing.

[0014] -Finally, the patient visits the clinic a fourth time for the delivery and final placement of the finished dentures, however, this is only assuming that there are no defects or additional corrections or adjustments required, otherwise, the number of visits will be much higher.

[0015] In view of the above, it is clear that the common method for making dentures for completely edentulous people has significant disadvantages. In addition to the obvious inconvenience caused to the patient by the multiple visits to the clinic, this method is also affected by other technical aspects such as preparation time, the need for experienced professionals to carry out the carving and assembly of the teeth, or increased handling of the denture, which increases the risk of microbial colonization on the surface of the denture.

[0016] However, despite the importance of these disadvantages, which are similar to those faced by patients with one jaw without teeth, it is more important that many of these operations performed in clinics to date are done without ensuring a certain quality, relying instead on the level of expertise of the professionals responsible for taking the measurements.

[0017] Specifically, we refer to the above steps of the method in which the patient comes to the clinic to both provide his / her bite record and to perform tests in which a template with teeth occlusion, esthetics, centric relationship, vertical dimensions and phonation is checked for correctness.

[0018] As previously mentioned, the testing is generally dependent on the expertise of the clinic professional, who is not provided with alignment, occlusion and other parameters following any proper examination method other than based on their good observation and experience. Summary of the invention

[0019] The system of the invention makes it possible to overcome the main drawbacks of the above-mentioned prior art, since generally the system of the invention makes it possible to reduce the number of patient visits to the clinic by half, thereby simplifying the process. In addition, the system of the invention makes it possible to reduce the manufacturing and processing time of the dentures, which in turn reduces the delivery time accordingly.

[0020] More specifically, by means of the technical features of the present invention as will be seen below, the technical features combine digital technology and manual technology, thereby obtaining benefits such as the following:

[0021] - Best aesthetics,

[0022] -Quality and hygiene control of processes and materials,

[0023] - Reduction of the testing period for patients,

[0024] - Higher clinic productivity, and

[0025] - Shorter recovery time.

[0026] All of this results in a better experience for dentists and patients, greater health safety, and ultimately better quality and greater reproducibility.

[0027] Furthermore, the system and method of the present invention provides clinic staff with a verification tool by which they can verify whether key parameters such as centric relation and vertical dimension are considered in the correct manner.

[0028] To this end, the impression-making system of the present invention for manufacturing removable dentures essentially comprises at least one template having a cavity capable of accommodating an impression material and being connected to the jaw of a patient in order to obtain an impression of the patient, wherein the template also comprises a positioning device which, among other functions, makes it possible to ensure the parallelism of the template relative to the bi-pupillary line (formed by an imaginary line connecting the centers of the two pupils of the patient receiving the denture) and the Camper plane, as well as to check whether the template is placed in the correct position relative to the midline of the face.

[0029] In particular, the positioning means are formed by at least one row of teeth, i.e., in the case where the template is intended to be attached to the patient's upper jaw, the positioning means are formed by at least the upper row of teeth, or, in the case where the template is intended to be attached to the patient's lower jaw, the positioning means are formed by at least the lower row of teeth.

[0030] In the rows of teeth, the free ends of the rows of teeth may also define a flat surface, so that the flat surface is used as a reference plane to check with the help of a Fox plane whether the template on which the flat surface is located maintains the above-mentioned parallelism with the bi-pupillary line and the Camper plane.

[0031] Likewise, according to a possible embodiment that will be explained in detail hereinafter, the positioning means may be formed not by a single row of teeth, but by two rows of teeth in occlusal position.

[0032] Thus, for example, in the case of an upper template, the positioning means will be formed by at least the upper incisors in the central part and at least two lower incisors in an occlusal position below the upper incisors, preferably at least two lower incisors in a central position.

[0033] In this way, the template with two rows of teeth makes it possible, in addition to evaluating the aesthetic part as described above, to record the midline of the denture, i.e. to check whether the template is positioned in the correct position relative to the midline of the face and, in addition, to check the height of the tangent line (i.e. the lower edge of the central incisor).

[0034] Therefore, in the case where the positioning device consists of two rows of teeth, the free ends of the second row of teeth (if it is a template intended to be attached to the upper jaw, the second row of teeth is the lower row of teeth, or if it is a template intended to be attached to the lower jaw, the second row of teeth is the upper row of teeth) define a flat surface so that this flat surface can be used as a reference plane to check whether the upper template maintains the above-mentioned parallelism with the bipupillary line and the Camper plane with the help of the Fox plane.

[0035] In addition, in order to record the optimal vertical dimension and define the centric relationship of the two templates, the system of the present invention may also include a centric relationship marking device, which can be well mounted on one of the upper template and the lower template when the patient is completely toothless and needs to use the upper template and the lower template, or directly mounted on the upper teeth or lower teeth or dental films depending on whether the patient is toothless in the lower jaw or the upper jaw.

[0036] The above centric relationship can be defined with the patient in his or her relaxed position, i.e., with no contact between the teeth, only slightly separated, and this relaxed position is considered the starting point for mandibular movement. This position is characterized by the patient's lack of muscle involvement, and is therefore used as the starting position, as it is the most stable and one of the easiest to reproduce.

[0037] Even more specifically, in order to record the optimal vertical dimension and define the centroidal relationship of the two templates, the centroidal relationship marking device includes a height-adjustable marking element.

[0038] Thus, for the example of making an impression for a completely edentulous person, in the marking process, after the first impression material has been applied to both templates and the height of the vertical dimension has been recorded, the above-mentioned centric relation marking means is arranged (in this example, it will be marked on the upper template) to obtain better adjustment and position recording. Specifically, the process will have the following steps:

[0039] - Place the centric relationship markers at the appropriate position on the lower template according to the patient's occlusion type,

[0040] - adjusting the vertical dimension by adjusting the marking means, and

[0041] -With the mouth relaxed, record (mark) the centric relation of the patient's mouth on the upper template.

[0042] Thus, after the second impression material has been applied to the template and the template has been inserted into the patient's mouth, the position of the template can be adjusted and a check can be made as to whether the template is optimally positioned and the templates can be adjusted to each other by matching the tip of the marking element of the centric relationship marking device with the position marked as optimal.

[0043] For all the above mentioned situations, with the impression system of the invention, a significant improvement over the prior art is obtained in terms of accuracy and efficiency, not only for the professional or prosthetist using the impression system, but also for the patient himself, who only has to go to the clinic twice, the first time to collect all the data and obtain the impression, and the second time when the final denture is already provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to facilitate a better understanding of the characteristics of the invention, according to a preferred example of a practical embodiment of the invention, a series of drawings are provided as an integral part of said description, in which, by way of illustration and not limitation, the following are shown:

[0045] Figure 1.1 , Figure 1.2 and Figure 1.3 A bottom perspective view, a top perspective view and a front view respectively show an example of an upper template of an impression making system for manufacturing a removable dental prosthesis of the present invention, wherein the positioning device consists of two rows of teeth.

[0046] Figure 2.1 and Figure 2.2 On the other hand two perspective views of a possible embodiment of the invention are shown, in which the lower template has positioning means formed by a row of teeth.

[0047] Figure 3.1 , Figure 3.2 and Figure 3.3 A bottom perspective view, a top perspective view, and a rear view are respectively shown of another example of a lower template of an impression making system for manufacturing a removable denture of the present invention.

[0048] Figure 4.1 and Figure 4.2 Two perspective views of a support device for a centric relation marking device of an impression making system for making a removable dental prosthesis of the present invention are shown.

[0049] Figure 5.1 and Figure 5.2 Two perspective views of a marking element of a center relation marking device and adjustment of the marking element in a supporting device are shown respectively.

[0050] Figure 6 A rear perspective view of an embodiment of an impression making system for making a removable dental implant of the present invention is shown, wherein the position of the upper template, the lower template, and the centric relation marking device can be seen when the centric relation marking device is located on the base template.

[0051] Figure 7.1 and Figure 7.2 Two perspective views of a possible embodiment of the invention are shown, in which the positioning device has a detachable fixing mechanism which enables the positioning device to be assembled and disassembled relative to the upper and lower templates, respectively.

[0052] Figure 8 Finally, a perspective view of another possible embodiment of the support device of the centric relation marking device of the impression making system for manufacturing the removable dental prosthesis of the present invention is shown. DETAILED DESCRIPTION

[0053] In view of the provided figures, it can be seen that in a preferred embodiment of the invention, the impression-making system of the invention for manufacturing removable dentures comprises at least one template (1, 2) having a cavity (1.1, 2.1) capable of accommodating an impression material and adapted to the jaw of a patient to obtain an impression of the patient, wherein the template (1, 2) also comprises positioning means which make it possible to ensure the parallelism of the template relative to the bi-pupillary line (formed by an imaginary line connecting the centers of the two pupils of the patient receiving the denture) and the Camper's plane, as well as to check the symmetry (i.e. whether the template is positioned in the correct position relative to the midline of the face).

[0054] Specifically, the positioning device is formed by at least one row of teeth (3, 4), in other words, the positioning device is formed by at least the upper row of teeth (3) when the template (1) is used to be attached to the patient's upper jaw, or by at least the lower row of teeth (4) when the template (2) is used to be attached to the patient's lower jaw.

[0055] However, according to Figure 1.1 , Figure 1.2 and Figure 1.3 In the possible embodiment shown, the positioning means can be formed by two rows of teeth (3, 4) in an occlusal position, one of the two rows being located above the other.

[0056] Thus, for example, in the case of the upper template shown in the attached figures, the positioning means will be formed by two rows of teeth, in which both the upper row of teeth (3) and the lower row of teeth (4) are formed by 4 incisors and 2 canines, i.e. there are 6 teeth in each row.

[0057] However, according to another possible embodiment of the present invention (not shown), the upper template (1) will include an upper row of teeth (3) and a lower row of teeth (4) located below the upper row of teeth, wherein the upper row of teeth has at least 2 upper incisors located in the central part, and the lower row of teeth has at least two lower incisors, preferably, at least two lower incisors are also located in the central position.

[0058] On the other hand, according to a possible embodiment, whether when there is only one row of teeth or when there are two rows of teeth as in the previous example, the free ends of these rows of teeth (3, 4) can form or define a flat surface (5) so that this flat surface is used as a reference plane to check whether the upper template (1) maintains the above-mentioned parallelism with the double pupil line and the Camper plane. This can be particularly useful in Figure 1.1 and Figure 1.3, where, in the former, the flat surface (5) is clearly visible, and in the latter, it can be seen how, when the patient places the upper template (1) in his / her mouth, he / she can compare the horizontal line defined by the flat surface (5) with his / her bi-pupillary line, either visually or with the help of a Fox plane or a simple ruler. It is logical that, in the case of a template comprising two rows of teeth (3, 4) as in the above-mentioned figures, the free end will be the free end of the lower row of teeth (4) if it is a template intended to be attached to the upper jaw, or, conversely, the free end of the upper row of teeth (3) if it is a template intended to be attached to the lower jaw.

[0059] Furthermore, as described above, in order to record the optimal vertical dimensions and define their central relationship, according to a possible practical embodiment, the system of the present invention may include a central relationship marking device (6), which in turn includes a marking element (7) with a pointed end (7') to record the optimal position.

[0060] The centric relationship marking device (6) can be well mounted on one of the templates (1, 2) when the patient is completely toothless and needs to use the upper template (1) and the lower template (2), or can be directly mounted on the upper teeth or lower teeth or dental films depending on whether the patient is toothless in the lower jaw or the upper jaw.

[0061] More specifically, in the case of a person who has no teeth at all and such Figure 4.1 , Figure 4.2 and Figure 6 As shown, the centroidal relationship marking device (6) comprises a longitudinal base (8) having two anchors (9) at the end of its lower surface and a central hole (10), in which the marking element (7) is attached. In particular, for the example of embodiment shown in the said figures, the marking element (7) comprises a threaded area that cooperates with a complementary thread present inside the central hole (10), which enables the marking element (7) to be positioned at different heights or depths inside the said central hole (10).

[0062] In this way, once the marking element (7) is located in the central hole (10), the position of the marking element can be changed by screwing the first marking element until the tip (7') is stopped or contacts the lower surface of the upper template (1) and reaches the previously recorded vertical dimension in the static position, thereby defining the vertical dimension in this set of templates.

[0063] In addition, if Figure 5.1 and Figure 5.2As shown, the marking element (7) has a gripping device formed by a faceted profile (7") of a hexagon or the like, which can cooperate with a wrench to provide comfortable and accurate positioning of the wrench.

[0064] However, in order to record the optimal vertical dimension and define the centric relation, the centric relation marking device (6) must be able to be positioned in different locations depending on the patient's occlusion, i.e. depending on what type of occlusion or malocclusion (Type I, Type II, Type III) the patient has.

[0065] To this end, both the upper template (1) and the lower template (2) may include two guides (11), which in turn include adjustment means to position the center relationship marking device (6) in an appropriate position, as described above.

[0066] Specifically, as in Figure 3.2 and Figure 3.3 It can be seen in the example of the embodiment shown, in which the adjustment means are located in the lower template (2), said adjustment means being formed by a plurality of recesses (12) in the form of circular holes, to which the ends of the base (8) of the median relationship marking means (6) have anchors (9) which can be attached. However, for another embodiment of the invention (not shown), the recesses (12) can be formed by elongated holes, or according to another possible and even more general embodiment (also not shown in the drawings), said adjustment means can be formed by openings in the form of longitudinal slots, so that the adjustment means are not necessarily limited to a specific number of recesses and so that the anchors (9) can be positioned at any position along said slots.

[0067] Therefore, the recess (12) defines different positions corresponding to different types of oral cavity according to the occlusion type of the oral cavity.

[0068] Furthermore, the number and spacing of the recesses (12) will be determined by the size of the templates (1, 2) calculated by the applicant, wherein in order to cover 80%-90% of the openings of the most common sizes, templates of 5 sizes will be sufficient, which in turn will also affect the above-mentioned adjustment device for the centric relationship marking device (6), because it is expected that in the case of a template of the smallest size in a set or series of 5 templates, the recesses (12) may not be consistent in number or in the relative distances between the recesses relative to the case of a template of the largest size in the series of 5 templates.

[0069] On the other hand, the upper surface of the guide (11) forms a horizontal plane, so that once placed in the patient's mouth, the correct position of the guide relative to the bi-pupillary line can be checked by checking parallelism.

[0070] In this way, once the marking element (7) is located in the central hole (10), the position of the first marking element can be changed by twisting it until the tip (7') of the first marking element contacts or abuts the lower side of the upper template (1) (if the marking element (7) is already arranged on the lower template (2) or has been arranged directly on the lower jaw), or until the tip abuts the upper surface of the lower template (2) (if the marking element (7) is already arranged on the upper template (1) or has been placed directly on the upper jaw), and from that moment on, twisting is continued until the previously recorded vertical dimension is reached in the rest position.

[0071] On the other hand, according to these possible embodiments, both the upper template (1) and the lower template (2) include a marking platform (13), preferably, the marking platform has a smooth surface and occupies a large central area, which can be Figure 1.1 As shown in Figure 5 or in Figure 2, the tip (7') of the marking element (7) of the centration marking device (6) will be stopped. The tip (7') can also be made of a material (such as graphite) that can form a mark on the platform (13) to indicate the best position for the centration to be recorded on the platform (13).

[0072] More specifically, the centric relationship is recorded or marked in such a way that the patient must move the jaw forward and backward with the mouth relaxed. Later, he / she should move the jaw, placed at the back, laterally to the sides. This will cause the tip (7') of the marking element (7) to draw or mark a figure in the shape of an arrow on the above-mentioned marking platform (13), thereby defining the best position for recording the vertical dimensions and the bite at what will be the tip of the arrow. The position will then be marked on the platform (13) with any element such as an adhesive indicator (not shown) so that it will not be lost when the templates (1, 2) are processed.

[0073] On the other hand, as can be seen in the example shown in the attached drawings, both the upper template (1) and the lower template (2) comprise a plurality of through holes (14) which allow excess impression material to escape and adhere to the template during the impression making operation. Furthermore, in the case of an upper template (1) and a lower template (2), the upper template and the lower template have, on their front area, an undercut (15) which enables adaptation to the user's tongue tie.

[0074] Finally, in Figure 7.1 and Figure 7.2 In the example performed in , a possible embodiment of the invention is shown, wherein the system comprises a detachable fixing device (16) for connecting the templates (1, 2) and their corresponding positioning devices.

[0075] Thus, in particular, the removable fixing device (16) is formed by a tongue-and-groove system, wherein the template (1, 2) is a template comprising a concave portion and the positioning device (i.e. one or more rows of teeth (3, 4)) has a convex portion. However, other possible embodiments are not excluded, in which the convex portion is located in the template (1, 2) and the concave portion is located in the device, or even in other possible embodiments, a removable joint system other than the tongue-and-groove system can be used.

[0076] Even more specifically, returning to the example shown in the attached figures, the male part of the removable fixing device is constituted by a cylindrical part suspended or suspended on a rib parallel to one of the generatrixes of the cylindrical part, and in a complementary manner, the female part is formed by a cylindrical channel at the bottom and has a longitudinal channel at the top. In this way, once the cylindrical male part has been inserted by sliding, it is not possible to remove it by pulling upwards, since said cylindrical part will not be able to escape through the longitudinal channel of the female part, thus remaining trapped inside the female part until the above sliding operation is repeated in the opposite direction.

[0077] However, according to another example of embodiment (not shown in the figures), it may be interesting that these rows of teeth (3, 4) can be arranged in the template (1, 2) with a certain degree of freedom to correct the position relative to the template in which they are located or relative to the patient's existing teeth, for which purpose the system used will be of the ball joint type or similar to allow relative movement between the two parts.

[0078] at last, Figure 8 An example of a centric relation marking device (6') for use in the case where the patient is monojawed and edentulous is shown, in which case, as already stated, the centric relation marking device will be able to be attached directly to the upper or lower teeth or dental plates depending on whether the patient is monojawed and edentulous in the lower or upper jaws.

[0079] Therefore, in this case, the central relationship marking device (6) also includes a longitudinal base (8'), so that the longitudinal base has two anchors (9') at the end of its lower surface and has a threaded center hole (10'), in which the marking element (7) (not shown in the figure) is maintained at different heights or depths within the center hole (10'), as explained above.

[0080] However, for this example of embodiment, the anchor (9') is formed by an arched portion constituting two shells beneath which the patient's dental film will be located and which will serve as a basis for arranging the above-mentioned centric relation marking device (6).

Claims

1. An impression making system for making removable dentures, comprising: - at least one template (1, 2) having a cavity (1.1, 2.1) capable of receiving an impression material and adapted to the patient's jaw, and - positioning means for positioning at least said template (1, 2) in the oral cavity of a patient, Characterized in that the positioning means are formed by at least one row of teeth (3, 4).

2. The impression making system for manufacturing removable dentures according to claim 1, characterized in that: The mold making system comprises an upper mold plate (1) and a lower mold plate (2).

3. The impression making system for manufacturing removable dentures according to claim 1 or 2, characterized in that: The positioning device is formed by two rows of teeth in an occlusal position, the two rows of teeth being an upper row of teeth (3) and a lower row of teeth (4).

4. The impression making system for manufacturing removable dentures according to claim 3, characterized in that: The upper row of teeth (3) consists of at least two teeth, and the lower row of teeth (4) consists of at least two teeth.

5. The impression making system for manufacturing removable dentures according to claim 4, characterized in that: The upper row of teeth (3) is formed by four upper incisors, and the lower row of teeth (4) is formed by at least two lower incisors located in a central position.

6. An impression making system for producing removable dental prostheses according to any one of the preceding claims, characterized in that The free ends of the rows of teeth (3, 4) define a flat surface (5).

7. An impression making system for producing removable dental prostheses according to any one of the preceding claims, characterized in that The impression making system comprises a detachable fixing device (16) for connection between the template (1, 2) and the positioning device.

8. The impression making system for manufacturing removable dentures according to claim 7, characterized in that: The removable fixing means (16) are formed by a tongue and groove system, wherein the templates (1, 2) comprise a female portion and the positioning means have a male portion.

9. The impression making system for manufacturing removable dentures according to claim 7, characterized in that: The removable fixing device (16) is formed by a system enabling relative movement between the templates (1, 2) and the positioning device.

10. An impression making system for producing removable dental prostheses according to any one of the preceding claims, characterised in that The impression making system comprises a centroidal relation marking device (6), which comprises a marking element (7) having a pointed end (7') and adjustable in height, to record the optimum position of the vertical dimension.

11. The impression making system for making removable dentures according to claim 10, characterized in that: The upper template (1) and / or the lower template (2) comprises two guides (11), and the guides comprise adjustment devices for positioning the center relationship marking device (6).

12. The impression making system for making removable dental prostheses according to claims 10 and 11, characterized in that The centring marking device (6) comprises a longitudinal base (8) having two anchors (9) at the ends of its lower surface, which can be coupled to the adjustment means of the templates (1, 2).

13. An impression making system for manufacturing removable dentures according to any one of claims 10 to 12, characterized in that: The adjustment device of the guide (11) is formed by a plurality of recesses (12).

14. An impression making system for manufacturing removable dentures according to any one of claims 10 to 12, characterized in that: The adjustment means of the guide (11) are formed by grooves.

15. The impression making system for manufacturing removable dentures according to any one of claims 10 to 14, characterized in that: The marking element (7) comprises a threaded region which cooperates with a complementary thread present in the central hole (10) of the centring marking device (6).

16. The impression making system for manufacturing removable dentures according to claim 11 or 13, characterized in that: The guide member (11) forms a plane on the upper surface of the guide member.

17. An impression making system for producing removable dental prostheses according to any one of the preceding claims 10 to 16, characterized in that The upper template (1) and / or the lower template (2) comprises a marking platform (13), which occupies a large central area of ​​the upper template and / or the lower template.

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