Dental device

Abstract

A dental device (1) is provided comprising at least an implant-type support (2) configured to be fastened to a bone portion of a user and defining a locking axis (3a); connection means (3) configured to operatively interconnect the support (2) and a dental prosthesis (10), defining at least one locking configuration wherein the support (2) and the prosthesis (10) are securely fastened, and including a joint (4) comprising at least a first portion (4a) predominantly extending along a direction parallel to the locking axis (3a), a body (5) comprising a guide (50) extending along a guiding direction (5a) transverse to the locking axis (3a) and a cavity (51) suitable for housing the first portion (4a), and obstruction means (6) comprising a slider (60) loosely housed within the guide (50), wherein the first portion (4a) comprises a hole (40) substantially aligned with the guide (50) when the connection means (3) are in the locking configuration, so as to allow the slider (60) to be inserted into the hole (40); wherein the obstruction means (6) are configured to exert a force on the slider (60) to move it along the guiding direction (5a) within the guide (50) such that at least part of the slider (60) enters the hole (40), thereby obstructing reciprocal movement between the joint (4) and the body (5) and wherein the device (1) further comprises resistant means (7) configured to generate, at least when the connection means (3) are in the locking configuration, a resistance (R) transverse to the guiding direction (5a) and suitable for resisting the approach of the body (5) to the joint (4).

Description

[0001] DESCRI PTION

[0002] DENTAL DEVICE

[0003] The present invention relates to a dental device of the type specified in the preamble of the first claim.

[0004] In particular, the present invention pertains to a dental device used by users requiring dental prostheses, primarily within the field of implantology with fixed-type prostheses.

[0005] As is well known, in the dental field, prostheses are intended to morpho-functionally rehabilitate dental arches with single, multiple, or total edentulism.

[0006] Specifically, in dentistry, a fixed prosthesis on implants may be cemented to the abutment screwed into the osseointegrated implant or directly screwed into the implant itself.

[0007] Since the 1980s, with the advent of modern implantology initiated by Branemark's studies, fixed prostheses on implants have remained unchanged, adhering to the fixation constraint through cementation or screwing, relying exclusively on implant support without gingival support.

[0008] The known technique described entails certain significant drawbacks.

[0009] The current technique for securing prosthetic parts, either screwed or cemented, have some operational issues. For instance, it often does not allow easy removal of prosthetic structures affixed to implants, because to disassemble a tooth cemented onto the abutment screwed into the implant, specialized extractors configured to hammer the prosthetic part are necessary, sometimes causing fractures to the prosthesis, resulting in significant damage.

[0010] With particular reference to the fixed-type implant prosthesis technique, such as the all-on-four system, although implantation techniques have evolved from Branemark to Malo, the methods of attaching prostheses to implants have remained unchanged, fundamentally relying on mechanical screw joints.

[0011] As a result, prostheses, also known as Toronto prostheses, have not undergone effective evolution and remain tied to old drawbacks.

[0012] Specifically, all-on-four type prostheses do not allow users adequate home hygiene, often leading to peri-implantitis, which causes the loss of implant pillars.

[0013] Additionally, from a dental perspective, the fixation of the all-on-four prosthesis is universally executed with titanium micro-screws, which often break under mechanical stress, creating significant issues for clinicians and, consequently, for patients or users.

[0014] Furthermore, such prosthetic rehabilitation necessitates users visiting a clinic every six months for maintenance. The known state-of-the-art devices must be disassembled to release the prosthesis for cleaning, especially in areas inaccessible to users.

[0015] In these areas, failure to perform proper and timely maintenance often results in peri-implant inflammations caused, for example, by food residues, plaque, and tartar buildup.

[0016] These drawbacks are, therefore, connected to the fact that the user cannot independently remove the prosthesis but requires a specialized dentist, with the further consequence that, in the event of mechanical breakage of the prosthesis, the user's life is disrupted, as they must seek out a specialized facility.

[0017] The above requirements involve inconveniences both for the user, whose daily life is disrupted, and for the operators who must address immediate emergencies.

[0018] Various devices are known to implement specific couplings between dental prostheses and implants. Certain devices, in particular, include magnetic couplings that allow attachment and detachment of the prosthesis from the implant by applying a predetermined separation force or using external tools to nullify the external magnetic attraction.

[0019] Among the various devices adopting more complex solutions is the device described in patent US-B-6171107. The latter essentially describes an implant that can house a prosthetic tooth shaped like the implant’s coupling portion, wherein the implant includes two sliders housed within guides and pushed outward by springs. The prosthesis, therefore, includes cavities designed to house at least part of the sliders. Consequently, the coupling is substantially achieved through the repelling force exerted by the springs, pushing the sliders into the prosthesis’s cavities.

[0020] However, even the devices described above have significant drawbacks.

[0021] In devices that include pure magnetic couplings, the magnets must be specifically shaped to stabilize the prosthesis on the implant. Moreover, the magnetic coupling force must be very high, as the denture can be subjected to substantial loads during activities such as chewing.

[0022] Regarding the device described in patent US-B-6171107, while the described drawbacks are essentially solved by the sliders locking the prosthesis parallel to the gingiva, other significant drawbacks remain.

[0023] In particular, the prosthesis must necessarily be hollowed out to allow containment of the implant portion that achieves the coupling. Furthermore, the prosthesis must include additional cavities to accommodate the sliders. These characteristics result in high manufacturing time and costs.

[0024] Additionally, the inclusion of extremely small springs results not only in high production costs but also in a higher likelihood of device breakage.

[0025] The primary drawback, however, lies in the requirement for magnets on the anterior and posterior sides of the prosthesis to solve the constraint created by the springs for both coupling and decoupling. Essentially, the sliders are indeed magnetized so that when brought close to external magnets, they experience an opposite magnetic force exceeding the spring’s elastic force. In this way, the sliders retract into their guides, removing the constraint between the prosthesis and the implant.

[0026] Therefore, such measures imply that the device described in patent US-B-6171107 prevents the coupling and decoupling of the prosthesis and implant in a short time. Essentially, in this regard, among the drawbacks of the device, there remain the known disadvantages of conventional mechanical connections in terms of maintenance.

[0027] A similar device is also described in patent application US-A-2016143713.

[0028] This application describes a dental device essentially comprising an abutment that can be fitted into a support incorporated within a prosthesis, inside of which a hollow guide is formed, allowing for the sliding of a cursor.

[0029] The cursor is then pushed towards the exit of the guide by a spring and is specifically designed to create a locking configuration wherein the cursor, under the action of the spring, inserts into a groove defined within the abutment.

[0030] Even the described prior art technique includes some significant drawbacks.

[0031] In particular, the coupling between the cursor and the groove, as described in the patent document, is not sufficiently stable. It has been observed that applying an extraction force on the dental prosthesis, i.e., perpendicular to the direction of movement of the cursor, may cause the prosthesis to detach from the abutment.

[0032] Additionally, such a mechanism is difficult to adapt to small-sized dentition because it is very complex and expensive to implement extremely small springs capable of applying sufficient coupling force on the cursor.

[0033] Furthermore, the springs wear out and require constant maintenance.

[0034] To address these drawbacks, the dental device described in patent application WO- A-2021116961 has been developed.

[0035] However, although very efficient, it has been found that the dental device described in patent application WO-A-2021116961 , like all devices involving mechanical connections and magnetic devices, also has other significant drawbacks.

[0036] In particular, to obtain highly stable devices that can prevent any movement, even on a microscopic scale, of the prosthesis relative to the implant screwed into the gum, it is necessary to design coupling mechanisms with very low tolerances. However, this configuration can lead to situations where the devices seize up, with unintended cementation, for example due to conometric adhesion, of the mechanisms, which in some cases may even require the replacement of the entire implant componentry.

[0037] Conversely, adopting excessively high tolerances to reduce the likelihood of seizing results in the inevitable consequence of creating loose mechanisms that do not provide the necessary stability to the prosthesis, which, as part of a dental arch, must maintain its positioning even under high loads.

[0038] Therefore, these latter drawbacks cannot be solved by any of the known art devices. In this situation, the technical task underlying the present invention is to devise a dental device capable of substantially overcoming at least some of the mentioned drawbacks.

[0039] Within the scope of this technical task, an important aim of the invention is to provide a dental device offering a dental prosthesis fastening solution that is more advanced compared to the known techniques taught starting from Branemark to Malo.

[0040] In particular, it is essential that the aforementioned technical task is solved by providing a device with a relatively simple structure, which is very stable and reduces the number of components required for its implementation.

[0041] Another important aim of the invention is to create a dental device that allows easy assembly and disassembly of dental prostheses from implant pillars or similar structures.

[0042] As a result, another aim of the invention is to provide a device that allows a user to remove prostheses entirely independently for maintenance purposes, while maintaining the same functional efficacy as a fixed prosthesis.

[0043] Therefore, another aim of the invention is to obtain a dental device that reduces complications due to emergencies related to possible breakages or infections arising from the use of the known technique.

[0044] In addition, another objective of the invention is to create a dental device that is simultaneously extremely stable and has a reduced, if not negligible, likelihood of seizing during coupling or decoupling operations.

[0045] In particular, in this sense, another aim of the invention is to eliminate involuntary movements of the dental prosthesis relative to the gum, naturally when the device is in use, and to always ensure that the internal parts of the dental device remain mobile and cannot become stuck or cemented to other parts, for example, due to joints formed by thermal alterations in parts that can create friction.

[0046] The technical task and the specified aims are achieved by a dental device as claimed in appended claim 1.

[0047] Preferred technical solutions are highlighted in the dependent claims.

[0048] The features and advantages of the invention are clarified below by the detailed description of preferred embodiments of the invention, with reference to the attached drawings, wherein:

[0049] Fig. 1 shows a lateral sectional view of a dental device according to the invention in a preferred embodiment with elastic resistant means including a polymeric cylinder wherein the connection means are in a locking configuration;

[0050] Fig. 2 illustrates a lateral sectional view of the dental device of Fig. 1 wherein the connection means are in an unlocking configuration;

[0051] Fig. 3 is a lateral sectional view of a dental device according to the invention in an alternative embodiment with elastic resistant means including a spring wherein the connection means are in an unlocking configuration;

[0052] Fig. 4 represents a lateral sectional view of a dental device according to the invention in an alternative embodiment with resistant means including magnets embedded in the second portion of the joint wherein the connection means are in an unlocking configuration;

[0053] Fig. 5 shows a lateral sectional view of a dental device according to the invention in an alternative embodiment with resistant means including magnets embedded respectively in the second portion of the joint and in the body, wherein the connection means are in an unlocking configuration;

[0054] Fig. 6 illustrates an exploded view of a preferred embodiment of a dental device according to the invention;

[0055] Fig. 7a is a lateral sectional view of the dental device of Fig. 6 wherein the connection means are in an unlocking configuration;

[0056] Fig. 7b represents a transverse sectional view, perpendicular to the locking axis, of the dental device of Fig. 6 wherein the connection means are in an unlocking configuration;

[0057] Fig. 8a is a lateral sectional view of the dental device of Fig. 6 wherein the connection means are in a locking configuration;

[0058] Fig. 8b represents a transverse sectional view, perpendicular to the locking axis, of the dental device of Fig. 6 wherein the connection means are in a locking configuration;

[0059] Fig. 9 shows an exploded view of an embodiment of a dental device according to the invention;

[0060] Fig. 10 illustrates a transverse sectional view, perpendicular to the locking axis, of a dental device according to the invention wherein the connection means are in an unlocking configuration;

[0061] Fig. 11 is a frontal view of a dental device according to the invention wherein the connection means are in a locking configuration;

[0062] Fig. 12a represents a lateral sectional view of a dental device according to the invention in a preferred embodiment with magnetic elements wherein the connection means are in an unlocking configuration just before achieving the locking configuration;

[0063] Fig. 12b shows a lateral sectional view of a dental device according to the invention wherein the connection means are in a locking configuration;

[0064] Fig. 13 illustrates a second rear sectional view of a dental device according to the invention wherein the connection means are in a locking configuration;

[0065] Fig. 14 is a perspective view of a joint of a dental device according to the invention in an alternative embodiment;

[0066] Fig. 15a represents a lateral sectional view of a body of a dental device according to the invention in an alternative embodiment compatible with the joint of Fig. 14; Fig. 15b shows a lateral view of a cursor of a dental device according to the invention in an alternative embodiment compatible with the joint of Fig. 14 and the body of Fig. 15a;

[0067] Fig. 15c illustrates a lateral sectional view of the joint of Fig. 14;

[0068] Fig. 16 is a perspective view of a cursor of a dental device according to the invention in the embodiment of Figs. 9-13;

[0069] Fig. 17 represents a lateral sectional view of a dental device according to the invention wherein the connection means are in an unlocking configuration just before achieving the locking configuration, and the joint hole includes slanted side walls designed to allow the disconnection of the connection means without the use of external apparatus;

[0070] Fig. 18a shows a lateral sectional view of a dental device according to the invention in an alternative embodiment with an elastic element wherein the connection means are in an unlocking configuration just before achieving the locking configuration;

[0071] Fig. 18b illustrates a lateral sectional view of the dental device of Fig. 18a wherein the connection means are in a locking configuration;

[0072] Fig. 19 represents a lateral sectional view of a dental device according to the invention wherein the component does not entirely occupy the guide within which it is positioned;

[0073] Fig. 20 represents a lateral sectional view of a dental device according to the invention wherein the joint is mounted obliquely onto the support;

[0074] Fig. 21 illustrates a transverse sectional view, perpendicular to the locking axis, of a dental device according to the invention wherein the first tongue and the lateral tongues are arranged along a C trajectory but are mutually separated;

[0075] Fig. 22a is a lateral sectional view of a dental device according to the invention in an alternative embodiment wherein the component exerts a repulsive magnetic force on the cursor and is located at the bottom of the guide, facing it, and the connection means are in an unlocking configuration just before achieving the locking configuration;

[0076] Fig. 22b represents a lateral sectional view of the dental device of Fig. 22a where the connection means are in a locking configuration; and

[0077] Fig. 23 illustrates a frontal sectional view of a dental device known in the current state of the art.

[0078] In this document, measurements, values, shapes, and geometric references (such as perpendicularity and parallelism), when associated with words like "approximately" or similar terms such as "almost" or "substantially", are to be understood as subject to measurement errors or inaccuracies due to production and / or manufacturing errors and especially as subject to slight deviations from the associated value, measurement, shape, or geometric reference. For example, such terms, when associated with a value, preferably indicate a deviation not exceeding 10% of the value itself.

[0079] Furthermore, when terms such as "first", "second", "upper", "lower", "primary", and "secondary" are used, they do not necessarily identify an order, priority of relation, or relative position but may simply be used to distinguish different components more clearly one from the other.

[0080] Unless otherwise specified, as appears from the following description, terms such as "processing", "computing", "determining", "computation", or similar, refer to the actions and / or processes of a computer or similar electronic computation device that manipulates and / or transforms data represented as physical quantities, such as electronic magnitudes of records of a computing system and / or memories, into other data similarly represented as physical quantities within computer systems, records, or other information storage, transmission, or display devices.

[0081] The measurements and data reported in this text are to be considered, unless otherwise specified, as performed in the International Standard Atmosphere ICAO (ISO 2533: 1975).

[0082] With reference to the Figures, the dental device according to the invention is globally indicated with the number 1.

[0083] The device 1 is preferably substantially at least part of a dental implant intended to enable the rehabilitation of at least a portion of edentulous dental arches. Specifically, the device 1 can be a prosthetic connection attachable to an osseointegrated implant.

[0084] In detail, it is preferably of the type for fixed prostheses, attachable to osseointegrated implants and connecting a portion of the implant to the fixed prosthesis. It also partially includes components of the implant or fixed prosthesis known in the current state of the art.

[0085] As is evident, therefore in this document, the term "dental implant" may collectively refer to the device 1 , meaning all the components that comprise the osseointegrated portion and the prosthetic portion, even though conventionally the term implant typically refers to the osseointegrated implant, i.e., solely the osseointegrated portion distinct from the prosthetic connection that links the prosthesis to the implant and within which the prosthesis may be integrated. Therefore, the term dental implant is to be understood broadly and includes the prosthesis, whereas the term osseointegrated implant refers solely to the osseointegrated portion that does not include the prosthesis.

[0086] The device 1 preferably includes at least one support 2 and connection means 3. Preferably, the support 2 is of the implantable type and, therefore, configured to be attached to a bone portion of a user. Alternatively, the support 2 can be free or attached to a model of a bone portion. This latter is preferably an artificial model, thus not human, representing the bone portion.

[0087] Essentially, the support 2 is, for instance, a common implant used in the all-on-four technique. Therefore, the support 2 may include what is conventionally called an osseointegrated implant. For this purpose, it can include a stem featuring one or more diaphragms surrounding the stem and designed to enable the locking of the support 2 within a bone portion in the mandibular region of a user by friction.

[0088] Essentially, therefore, the support 2 has a structure substantially similar to the structure of a common wall plug.

[0089] Naturally, the materials constituting the support 2 are biocompatible.

[0090] In any case, the support 2 defines a main axis 2a.

[0091] The main axis 2a can substantially coincide with the predominant development axis of the support 2. For instance, it can be a central axis of the support 2 when the support defines a shape very similar to a cylinder or a truncated cone.

[0092] Additionally, the support 2 preferably defines a locking axis 3a.

[0093] The locking axis 3a is preferably the direction along which the components of the device 1 are assembled. The locking axis 3a may be aligned with the main axis 2a, as shown in Fig. 3, or it may be slanted relative to it, as shown in Fig. 12.

[0094] The connection means 3 are instead configured to operatively interconnect the support 2 and a prosthesis 10. Specifically, the connection means 3 firmly attach the support 2 and the prosthesis 10 along the locking axis 3a.

[0095] The prosthesis 10 is preferably a dental prosthesis. Therefore, it can be a prosthesis defining an entire dental arch, a part of the dental arch, or even a single tooth or part thereof.

[0096] The prosthesis 10 is also attached to at least part of the connection means 3 using conventional methods, i.e. , methods widely used in techniques such as the all-on- four technique or prostheses attached to osseointegrated implants.

[0097] Essentially, the prosthesis 10 can be attached by bonding, using specific locking means such as micro screws and bolts, interlocking, screwing, or other known techniques.

[0098] Essentially, the method of attachment between the prosthesis 10 and the connection means 3 is not the object of the present invention, as it is widely known.

[0099] In general, the connection means 3 define at least one locking configuration. In the locking configuration, preferably, the support 2 and the prosthesis 10 are firmly attached.

[0100] By firmly attached, it is meant that the prosthesis 10 is locked relative to the support 2 and can only move integrally with the support 2.

[0101] Naturally, the connection means 3 also enable one or more unlocking configurations. Specifically, in at least one unlocking configuration, the support 2 and the prosthesis 10 are mutually movable at least along the locking axis 3a.

[0102] This configuration is, for instance, achieved when the connection means 3 are in the coupling phase, i.e., just before achieving the locking configuration. Obviously, in other unlocking configurations, the prosthesis 10 and the support 2 can be mutually movable in any direction.

[0103] The connection means 3 include, therefore, a joint 4 and a body 5.

[0104] The joint 4 and the body 5 are configured to be mutually coupled in such a way as to achieve the locking configuration.

[0105] Therefore, preferably, one of the joint 4 and the body 5 is attached to the support 2, and the other of the joint 4 and the body 5 is configured to be attached to the prosthesis 10.

[0106] To this end, specifically, the joint 4 or the body 5 attached to the support 2 can include a base with holes configured to be coupled to the support 2 in a conventional manner, for instance, through fixing screws 20, as clearly shown in Fig. 1 and 9. The joint 4 or the body 5 configured to be attached to the prosthesis 10 may include a flat area suitable for allowing, for example, the bonding of the prosthesis 10 onto the joint 4 or the body 5, facilitating its positioning.

[0107] These examples are, naturally, not binding but are merely simple illustrations of how the connections between the joint 4 or body 5 with the support 2 and / or the prosthesis 10 can be implemented. Indeed, the prosthesis 10 could also encapsulate or integrate the joint 4 or the body 5 within itself.

[0108] The joint 4, specifically, includes at least a first portion 4a, which extends predominantly along a direction parallel to the locking axis 3a. In this sense, the first portion 4a preferably includes a first tab 42 that extends in a direction parallel to the locking axis 3a.

[0109] This tab 42 thus defines a wall extending along the locking axis 3a. However, the first portion 4a could include second tabs 43, placed on the sides of the first tab 42 and also protruding along the locking axis 3a.

[0110] In detail, preferably, the first portion 4a defines a wall with a substantially C-shaped cross-section perpendicular to the locking axis 3a.

[0111] This C-shaped cross-section can be implemented in various ways: the tabs 42, 43 can be interconnected, forming a solid C cross-section, or a U shaped one, or a similar shape.

[0112] Alternatively, the tabs 42, 43 can be separate and arranged along a C-shaped trajectory, as shown in Fig. 13.

[0113] This C-shaped cross-section can, therefore, have a shape resembling a semicircle or include a circular arc that is more or less extended. For instance, the C crosssection can extend as a circular arc subtending an angle of 260°, as shown in Fig. 2.

[0114] However, the joint 4 could also include only the first tab 42, for instance, with a rectangular base in a cross-section perpendicular to the locking axis 3a.

[0115] In any case, the joint 4 is configured to be at least partially inserted into the body 5 along the locking axis 3a. The joint 4 is configured, in even greater detail, so that the first portion 4a is entirely inserted into the body 5 along the locking axis 3a.

[0116] Preferably, in addition to what has been said, the first portion 4a also includes a hole 40.

[0117] The hole 40 preferably extends in a direction inclined with respect to the locking axis 3a. Specifically, preferably, the hole 40 extends perpendicularly to the locking axis 3a.

[0118] The hole 40 can also be a through-hole or a blind hole. In this sense, if the hole 40 is blind and not a through hole, it may essentially be a groove made on the wall defined by the first portion 4a, as shown in Figs. 9 and 11 . If the hole 40 is a through- hole, it passes through the C-shaped wall or the tab completely. If the first portion 4a defines a C-shaped wall, the hole 40 is preferably located in the central zone of the C, that is, at the first tab 42.

[0119] Moreover, the first portion 4a defines a free end 41 .

[0120] The free end 41 is the portion of the joint farthest from the coupling zone with the support 2 or the prosthesis 10. Therefore, the free end 41 is the terminal part of the first portion 4a, that is, for example, the tip of the tab 42 or tabs 42, 43 defined by the joint 4.

[0121] Preferably, the free end 41 is wedge-shaped. The term wedge-shaped means that the first portion 4a defines, at the free end 41 , a tip created, for instance, with a cut inclined relative to the wall extending along the locking axis 3a.

[0122] The body 5 is, as stated, designed to house at least partially the joint 4 and, specifically, to house entirely the first portion 4a.

[0123] To this end, it includes at least one cavity 51.

[0124] The cavity 51 preferably extends in a direction parallel to the locking axis 3a when the connection means 3 are in the locking configuration. By this, it is meant that the geometric description of the cavity 51 , and other subsequently described parts, is carried out for simplicity, considering the locking configuration. Naturally, when the body 5 is detached from the joint 4, it is no longer integral with the joint 4, and the cavity 51 can extend in any direction.

[0125] In any case, the cavity 51 is designed to house the first portion 4a. For this purpose, the cavity 51 can be oversized relative to the first portion 4a. Alternatively, it can be counter-shaped relative to the first portion 4a itself. For instance, when the first portion 4a defines a C-shaped cross-section, the cavity can also define a C-shaped cross-section. This configuration is particularly stable both in terms of translation and rotation.

[0126] The body 5, however, is preferably configured to accommodate other objects.

[0127] It thus includes a guide 50. The guide 50 preferably extends along a guiding direction 5a.

[0128] The guiding direction 5a is preferably transverse to the locking axis 3a when the connection means 3 are in the locking configuration.

[0129] The guide 50 can thus define an entirely through hole within the body 5 along the guiding direction 5a. Alternatively, the guide 50 may define a partially through hole featuring an opening and a bottom.

[0130] The guide 50 can also assume various shapes, mainly dependent on the type of object to be accommodated inside. Various preferred, though not limiting, embodiments are subsequently described.

[0131] In any case, preferably, the guide 50 and the hole 40 are configured to align when the connection means 3 are in the locking configuration.

[0132] Additionally, preferably, the hole 40 has similar dimensions to the guide 50 and may also have similar shapes.

[0133] The connection means 3 also include obstruction means 6.

[0134] The obstruction means 6 are configured to block the mutual movement between the joint 4 and the body 5. Therefore, they block the two elements to achieve the locking configuration.

[0135] The obstruction means 6, specifically, are configured to block the first portion 4a within the cavity 51. As such, they could include simple irreconcilable locking elements.

[0136] However, preferably, the obstruction means 6 are configured to be resolvable on command.

[0137] Preferably, the obstruction means 6 include a slider 60.

[0138] The slider 60 is preferably loosely housed within the guide 50. Specifically, preferably, the slider 60 is loosely housed at the bottom of the guide 50.

[0139] Additionally, the obstruction means 6 are configured to exert a force onto the slider 60, such as to move the slider along the guide 50, so that at least part of the slider 60 enters the hole 40.

[0140] In this way, the slider 60 interferes with the mutual movement between the joint 4 and the body 5, and the connection means 3 define the locking configuration.

[0141] In particular, preferably, the force exerted on the slider 60 to move it is magnetic. Therefore, preferably, the obstruction means 6 are configured to exert a magnetic force on the slider 60. This magnetic force can also be either an attractive or repulsive force, as described in more detail later. Even more preferably, the force exerted on the slider 60 can be exclusively magnetic.

[0142] The obstruction means 6 can include a component 61.

[0143] The component 61 , if present, is preferably secured within the body 5. Specifically, the component 61 can be secured within the body 5 near the opening of the guide 50. Essentially, the component 61 can, in at least one embodiment, act as a cap for the guide 50.

[0144] The component 61 can be snap-fitted into the body 5 or removable from it. Consequently, the slider 60 could also be removed from the body 5 when the connection means are in the disengaged configuration.

[0145] Preferably, the component 61 is fixed within the body 5 in such a way as to face the guide 50 and be separated from the guide 50 by the cavity 51 .

[0146] In essence, the cavity 51 intersects the guide 50 and bisects it into two portions, which respectively house the slider 60, or part of it, and the component 61 .

[0147] The component 61 could therefore occupy the entire portion of the guide 50 wherein it is housed or partially occupy it so that the slider 60, when the connection means 3 are in the locking configuration, is partially positioned within the guide 50, even on the side adjacent to the component 61 , as shown in Fig. 19.

[0148] As already mentioned, preferably, the guide 50 and the hole 40 are aligned when the connection means 3 are in the locking configuration. This alignment allows the slider 60 to be inserted into the hole 40. The slider 60 can be partially housed in the hole 40, for example, when the latter is not a through-hole, or it can pass entirely through the hole 40.

[0149] Advantageously, if the component 61 is present, it is configured, in at least one embodiment, to create a mutual magnetic attraction force with the slider 60. In this regard, one or both of the component 61 and the slider 60 can be magnetized, or one of them can be magnetically reactive, for instance, containing at least some metallic material. For example, the slider 60 may include a central portion 60a made of neodymium covered with a coating 60b of titanium carbide. Alternatively, the coating 60b could include a hard stone, such as ruby or diamond, either natural or synthetic, to increase its glide within the guide 50 and reduce friction. Thus, in general, the central portion 60a is the ferromagnetic part of the slider 60, while the coating 60b, surrounding at least part of the central portion 60a, preferably facilitates the sliding of the slider 60 along the guiding direction 5a. Therefore, preferably, the coating 60b is at least present in the portion of the slider 60 intended to interact with the joint 4.

[0150] The component 61 , in turn, may also include a magnet coated with titanium carbide or other useful materials, such as parylene.

[0151] In this embodiment, the slider 60 and the component 61 attract each other at least in the locking configuration.

[0152] Preferably, the component 61 is configured to remain securely fixed to the body 5, while the slider 60 moves toward the component 61 .

[0153] Essentially, when the connection means 3 are in the locking configuration, the slider 60 is drawn toward the component 61 , enters the hole 40, and obstructs the mutual movement between the joint 4 and the body 5.

[0154] The support 2 and the prosthesis 10 can thus be stably secured to each other.

[0155] The insertion of the slider 60 into the hole 40 depends, as previously described, on the configuration of the hole 40. If the latter is not a through-hole and defines a simple groove on the wall of the first portion 4a, the slider 60 merely approaches the component 61 sufficiently to block the translational movement between the joint 4 and the body 5 along the locking axis 3a.

[0156] If, on the other hand, the hole 40 is a through-hole, the slider 60 is abuts against the component 61 and passes through the hole 40.

[0157] Both the free end 41 and the slider 60 define specific design features to facilitate the coupling of the joint 4 and the body 5.

[0158] Indeed, in a fully disengaged configuration, the slider 60 can rest against the component 61 , if present on the body 5, before the first portion 4a is inserted into the cavity 51.

[0159] However, the wedge-shaped free end 41 is configured to separate the slider 60 and the component 61 when the first portion 4a is inserted into the cavity 51 . Essentially, the tip of the free end 41 impacts the slider 60 and, as the first portion 4a advances into the cavity 51 , forces the slider 60 to retreat along the sloping plane defined on the free end 41 with respect to the wall of the first portion 4a, particularly, for example, the tongue 42.

[0160] To facilitate this retraction, also the slider 60 can also define certain key features. Specifically, the slider 60 may feature a tip rounded edge 600. This edge 600 is therefore preferably configured to ease the introduction of the free end 41 between the slider 60 and the component 61 . Additionally, if the coating 60b is present, it covers the central portion 60a at least in the area corresponding to the edge 600.

[0161] Essentially, the rounded edge 600 allows for the creation of a gap between the slider 60 and the component 61 , into which the tip of the wedge-shaped free end 41 can be inserted.

[0162] As previously mentioned, the guide 50, the hole 40, and the slider 60 can define several different embodiments.

[0163] By way of example, in a preferred embodiment, the guide 50 can be a cylindrical conduit, the hole 40 can have a truncated -cone shape, and the slider 60 can include a cylindrical body compatible with the guide 50 and a truncated -cone-shaped tip configured to fit into the hole 40.

[0164] If present, the rounded edge 600 is located at the truncated-cone-shaped tip.

[0165] In an alternative embodiment, the guide 50 can be a conduit with a predominantly parallelepiped shape and a rectangular base, the hole 40 can also have a predominantly parallelepiped shape with a rectangular base, and the slider 60 can include a body with a predominantly parallelepiped shape and a rectangular base, compatible with the guide 50 and the hole 40.

[0166] In this second embodiment, the guide 50 can also include one or more slots 500. The slots 500 are essentially grooves, preferably rectilinear, designed to create sliding tracks for the slider 60.

[0167] In turn, the slider 60 can include one or more fins 601 . The fins 601 may be simple rectilinear lateral projections of the slider 60.

[0168] Primarily, the fins 601 , if present, are configured to be housed within and to slide in a controlled manner within one or more slots 500.

[0169] In the preferred embodiment, the joint 4 is configured to be secured to the support 2, and the body 5 to the prosthesis 10.

[0170] Therefore, in this embodiment, the body 5 defines an attachment surface 52. The attachment surface 52, preferably flat, is configured to allow the stable fastening of the prosthesis 10.

[0171] The joint 4, in this embodiment, includes a second portion 4b. The second portion 4b is a base or shoulder configured to allow the reciprocal fastening of the joint 4 and the support 2. This second portion 4b is preferably conical around the locking axis 3a. Furthermore, in greater detail, it converges toward the body 5 at a first convergence angle ai, between 3° and 20°. Specifically, the first convergence angle ai is preferably approximately 5°.

[0172] Additionally, in turn the body 5 may include a housing 53.

[0173] If present, the housing 53 is also preferably conical. Furthermore, the housing 53 is designed to contain the second portion 4b.

[0174] In this regard, advantageously, the housing 53 defines a second convergence angle 0(2, measured relative to an axis parallel to the locking axis 3a, equal to or smaller than the first convergence angle a1 , thus for example, equal to or less than 20°, and more specifically, preferably 5°.

[0175] In addition, the second portion 4b defines an annular element centred along the locking axis 3a. The second portion 4b therefore includes a recess 45.

[0176] The recess 45 may essentially be a cavity wherein elements, as better described later, can be stably inserted. The recess 45 is preferably centred with respect to the locking axis 3a and can, for example, define an approximately cylindrical shape. The second portion 4b may also define a fastening hole 44.

[0177] The fastening hole 44 may communicate with the recess 45. Alternatively, the recess 45 and the fastening hole 44 may coincide. Or instead, the fastening hole 44 may be separated from the recess 45, for example, by a perforated wall designed to allow the passage of the fastening screw 20.

[0178] The fastening hole 44, shown in Fig. 15c, is preferably a through-hole along the second portion 4b, centred along the main axis 2a, and designed to accommodate part of the fastening screw 20, particularly the head. The locking axis 3a can therefore align with the main axis 2a or can extend along an inclined direction with respect to the main axis 2a, as shown in Fig. 20. Therefore, the fastening screw 20 can be housed obliquely within the second portion 4b.

[0179] When the fastening hole 44 is transverse to the locking axis 3a, it may be necessary to use fastening tools, such as screwdrivers, at an angle.

[0180] The first portion 4a is advantageously configured to be positioned around part of the fastening hole 44, whether it has a C-shaped cross-section or only includes the tongue 42.

[0181] This configuration allows the operator to easily secure the joint 4 to the support 2 by conveniently tilting the screwdriver in any direction, as the first portion 4a only occupies part of the space around the fastening hole 44.

[0182] In an alternative embodiment, the force that pushes the slider 60 along the guide 50 into the position where the connection means 3 achieve the locking condition could be elastic. Therefore, this force could be exerted by an elastic element 62.

[0183] If present, the elastic element 62 is placed, for example, between the bottom of the guide 50 and the slider 60.

[0184] Essentially, the slider 60 could thus be subjected to a repulsive force, relative to the bottom of the guide 50, aligned with the guide and designed to push the slider 60 toward the hole 40, as shown in Figs. 18a-18b.

[0185] This latter embodiment can similarly be implemented with the slider 60 and the component 61 .

[0186] In this case, the component 61 is included within the body 5. Specifically, it may be included at the bottom of the guide 50. Alternatively, the component 61 can seal the guide 50 like a plug. Additionally, the component 61 can be secured to the body 5, for example, embedded in it, or it can be removably secured at the bottom of the guide 50 or constitute the bottom of the guide 50, as shown in Figs. 22a-22b.

[0187] In any case, preferably, in the embodiment just described, the magnetic force exerted between the component 61 and the slider 60 is a repulsive force.

[0188] The main advantage of this embodiment is to avoid using a spring which, in cases where the body 5 is of reduced size, may be practically impossible to include.

[0189] In general, therefore, the component 61 , if present, is secured within the body 5 in such a way as to face or be part of the guide 50 and is configured to exert a magnetic force of either mutual attraction or repulsion with the slider 60, so that, when the connection means 3 are in the locking configuration, the slider 60 is drawn toward or repelled from the component 61 , enters the hole 40 (whether it is a through-hole or not), and obstructs the mutual movement between the joint 4 and the body 5.

[0190] In this configuration as well, the hole 40 may be moreover a through-hole or a blind hole. The through-hole 40 is preferable, though not essential, as it has the advantage of enhancing the locking strength between the body 5 and the joint 4 in any embodiment. With the through-hole 40, the slider 60 passes through the hole 40, penetrating the first portion 4a. The passage occurs whether the slider 60 abuts against the component 61 due to the attractive magnetic force, or pushed away from the component 61 due to the repulsive magnetic force, or pushed away from the bottom of the guide 50 by the elastic element 62 due to the repulsive elastic force. To improve the stability of the coupling between the joint 4 and the body 5, the device 1 preferably includes additional elements.

[0191] Specifically, advantageously, the dental device 1 includes resistant means 7.

[0192] The resistance means 7 are configured to generate, at least when the connection means 3 are in the locking configuration, a resistance R.

[0193] The resistant R is essentially a force. Therefore, it advantageously acts transversely to the guiding direction 5a. Consequently, the resistance R is designed to resist the approach of the body 5 to the joint 4, as shown in Fig. 1 .

[0194] Thus, essentially the resistance means 7 allow the device 1 to be preloaded with a resistance R when the connection means 3 are in the locking configuration. This preload helps stabilize the locking applied by the obstruction means 6, on which the resistance R acts, at least indirectly.

[0195] In other words, the resistance means 7 act like a damper, cushioning the coupling between the joint 4 and the body 5.

[0196] In this context, the resistance means 7 could, for example, be implemented as a simple gasket, even just a layer of deformable material, possibly an 0-ring, designed to be compressed during the approach of the joint 4 and the body 5. Therefore, in at least one embodiment, the resistance means 7 could include a gasket placed between the joint 4 and the body 5 when the connection means 3 are in the locking configuration. For instance, the gasket could be implemented as an 0-ring extending around the locking axis 3a and resting on the top of the second portion 4b or on the bottom of the body 5.

[0197] More specifically, the resistance means 7 could include a block 70. The block 70 is preferably made from antibacterial material.

[0198] Moreover, the block 70 could have, for example, a piston-like shape, i.e. approximately cylindrical, or other shapes. For instance, the block 70 could also have a basket or cap-like shape, forming a stem and a head with a larger crosssection than the stem and designed to rest on part of the second portion 4b over which the body 5 is intended to overlap. In this context, the block 70 could partially include a gasket designed to be placed between the joint 4 and the body 5.

[0199] If present, the block 70 is preferably housed, entirely or partially in the case of a basket or cap-like shape, within the recess 45 of the second portion 4b. If the recess 45 corresponds to the fastening hole 44, the block 70 can rest on the fastening screw 20. Alternatively, the block 70 could rest on a shoulder present at the bottom of the recess 45.

[0200] In any case, the block 70 is movable or elastically deformable at least along the locking axis 3a.

[0201] If the block 70 is deformable, it preferably includes an elastomeric material.

[0202] Additionally, or alternatively, if the block 70 is a rigid element, the resistant means 7 may include a thrust element 71.

[0203] If present, the thrust element 71 is configured to transmit at least part of the resistance R to the block 70. For example, the thrust element 71 can transmit at least part of the resistance R as an elastic resistance.

[0204] In this sense, the thrust element 71 can include a spring, as shown in Fig. 3.

[0205] Alternatively, the thrust element 71 can transmit at least part of the resistance R as a magnetic repulsion. In this context, as shown in Fig. 4, the thrust element 71 and / or the block 70 could be magnetic and both included within the second portion 4b of the joint 4.

[0206] Alternatively, as shown in Fig. 5, the thrust element 71 and / or the block 70 could be magnetic and included respectively within the second portion 4b of the joint 4 and the body 5.

[0207] Naturally, although less advantageous, the resistant means 7 described so far in their “passive” embodiments could also be “active.” For example, the block 70 could be configured to be moved from the outside to allow the preload resistance R to be adjusted.

[0208] The operation of the dental device 1 previously described structurally is as follows. The clinical operator, after installing the support or supports 2 onto the user’s bony portions, can secure a prosthesis 10 to part of the connection means 3, for example, to the base of the joint 4 or the body 5.

[0209] The operator can then insert part of the joint 4 into the body 5.

[0210] In this situation, two different scenarios, among others, may occur:

[0211] If the obstruction means 6 are pre-installed within the body 5, then the slider 60 is initially abutting against the component 61 or part of the body 5. However, upon insertion of the first portion 4a, the slider 60 is pushed away from or drawn toward the component 61 by the free end 41 of the joint 4. The first portion 4a is then free to continue its movement into the cavity 51 , and when the wall extending along the locking axis 3a is fully housed in the cavity 51 , the guide 50 and the hole 40 align. Thus, the slider 60 can return into the hole 40 and / or come into contact with the component 61. In this manner, the slider 60 obstructs the movement of the first portion 4a within the cavity 51 , and the connection means 3 achieve the locking configuration.

[0212] Naturally, if the slider 60 is pushed by the component 61 or by the elastic element 62, the slider 60 can re-enter the hole 40 and / or come into contact with a wall of the body 5, as shown in Figs. 18a-18b and 22a-22b. In this case as well, the slider 60 obstructs the movement of the first portion 4a within the cavity 51 , and the connection means 3 are in the locking configuration.

[0213] When the coupling between the joint 4 and the body 5 is achieved, the relative movement along the locking axis 3a between the joint 4 and the body 5 is partially hindered by the resistance R applied by the resistant means 7, which, then, once the locking is achieved through the slider 60, defines a preload applied to the connection means 3 of the device 1 .

[0214] The dental device 1 according to the invention also enables the embodiment of a new assembly method. The assembly method is preferably performed with the support 2 detached. Alternatively, the assembly method is performed with the support 2 secured to a model of the bony portion, i.e., not on the human body. Under no circumstances do the described assembly methods involve procedures involving humans.

[0215] The method may therefore include at least one placement phase and one securing phase.

[0216] In the placement phase, the first portion 4a enters part of the cavity 51 in an unlocked configuration such that the first portion 4a pushes the slider 60 away from or toward the component 61 .

[0217] In the securing phase, the first portion 4a is completely inserted into the cavity 51 so that the guide 50 aligns with the hole 40, and the slider 60 is drawn toward or pushed away from the component 61 and enters the hole 40, obstructing the relative movement between the joint 4 and the body 5.

[0218] In the embodiment wherein the component 61 is separate from the guide 50 due to the cavity 51 , during the placement phase, the first portion 4a pushes the slider away from the component 61 , and during the securing phase, the slider 60 is drawn toward the component 61 .

[0219] In the embodiment wherein the component 61 is facing to the guide 50, or part of it, during the placement phase the first portion 4a pushes the slider toward the component 61 , and during the securing phase, the slider 60 is pushed away from the component 61 .

[0220] Thus, the joint 4 could be fully or only partially housed within the body 5.

[0221] Naturally, if the joint 4 has a second portion 4b for securing to the support 2, as shown, for example, in Figs. 9-17, part of the joint 4 remains outside the body 5.

[0222] It is important to note that the wedge-shaped free end 41 is not essential to the invention. In this case, the coupling could be achieved with the assistance of an external apparatus.

[0223] Such an external apparatus could be an element capable of exerting an attractive or repulsive force on the slider 60, greater than the attractive or repulsive force exerted by the component 61 .

[0224] In this sense, the external apparatus could even be a simple magnet.

[0225] Preferably, with this mode of use, the operator can bring the magnet close to the bottom of the guide 50, on the external surface of the body 5, so as to achieve the movement of the slider 60 away from or toward the component 61 and allow the first portion 4a to enter the body 5 without obstruction.

[0226] Thus, the aforementioned assembly method might not include the placement phase but could include a preparation phase.

[0227] In the preparation phase, an external apparatus configured to exert a magnetic force on the slider 60, greater than the magnetic force exerted between the slider 60 and the component 61 , is positioned near the bottom of the guide 50 so as to move the slider 60 away from the component 61 and allow the insertion of the first portion 4a. Naturally, if the obstruction means 6 include the elastic element 62 and are without the component 61 , the external apparatus could exert an attractive magnetic force on the slider 60 to overcome the elastic repulsion force relative to the bottom of the guide 50 and retract the slider 60 to define an unlocked configuration.

[0228] The use of the external apparatus is also relevant for the subsequent decoupling of the slider of the connection means 3, once the slider 60 is inserted into the hole 40, i.e., once the locking configuration is achieved. In this regard, the decoupling method could include at least an extraction phase wherein an external apparatus configured to exert a magnetic force on the slider 60, greater than the magnetic force exerted between the slider 60 and the component 61 , is positioned at the bottom of the guide 50 so as to move the slider 60 away from the component 61 and allow the removal of the first portion 4a.

[0229] However, such a decoupling method is not necessary and could be avoided by creating holes defining inclined side walls 400, transverse to the guide direction 5a, i.e., the alignment direction of the guide 50 and the hole 40, configured to allow, as occurs with the wedge-shaped free end 41 , the slider 60 to be pushed away from the component 61 by applying a force along direction 2a sufficient to overcome the friction exerted by the side walls 400 of the holes on the surface of the slider 60 in relation to the magnetic attraction force generated by the slider 60 and the component 61 .

[0230] An example of this configuration is illustrated in Fig. 17.

[0231] Thus, the decoupling method could include a removal phase wherein a pushing force is applied on the body 5 or on the joint 4 along the locking axis 3a, greater than the parallel component to the locking axis 3a of the frictional force exerted by the inclined side walls 400 of the hole 40 on the slider 60, proportionally to the mutual magnetic attraction or repulsion force between the slider 60 and the component 61 . In the configuration wherein the slider 60 is pushed toward the hole 40 by the elastic element 62, the first component 61 is preferably not present, but the elastic force acting on the slider 60 can similarly be overcome by the external apparatus configured to exert a magnetic force opposite and greater than the elastic force.

[0232] In a second situation instead, the obstruction means 6 might not be pre-assembled with the body 5 or could be partially assembled.

[0233] Thus, an operator could insert the slider 60 into the guide 50, subsequently fully insert the first portion 4a into the cavity 51 , and then cap the guide 50 with the component 61 , thereby attracting the slider 60 toward the component 61 and locking the joint 4 and the body 5 together.

[0234] Alternatively, the component 61 could be inserted into the guide 50 to cap it after the slider 60 is inserted into the same guide 50, allowing to implement the embodiment shown in Figs. 15a-15b.

[0235] Thus, the invention allows for the embodiment of a new second assembly method. This second method therefore includes a first insertion phase, a second insertion phase, and a locking phase.

[0236] In the first insertion phase, the slider 60 is inserted into the guide 50 such that it does not obstruct the cavity 51 .

[0237] If the obstruction means include the elastic element 62, the elastic element 62 may also be inserted into the guide 50 before the slider 60 during this phase.

[0238] Naturally, the same component 61 could be inserted into the guide 50, as could the elastic element 62, before the slider 60.

[0239] In the second insertion phase, the first portion 4a is fully inserted into the body 5 so that the guide 50 and the hole 40 are aligned.

[0240] In the locking phase, the component 61 is secured to the body 5, preferably at the opening of the guide 50, to cap the guide 50 and draw the slider 60 into the hole 40 and locking the joint 4 and the body 5 together. The slider 60 can be drawn into the hole 40 either by attraction or repulsion, depending on where the component 61 is positioned.

[0241] Advantageously, one or more of the assembly methods include a pushing phase.

[0242] The pushing phase is preferably carried out during insertion. Thus, the push is applied by pressing the body 5 against the joint 4 along the locking axis 3a. Advantageously, the push occurs by exerting a push that exceeds the resistance R. This ensures that the connection means 3 achieve the locking configuration. Furthermore, the resistant means 7 determine, due to the resistance R, a preload on the device 1 .

[0243] The dental device 1 according to the invention offers significant advantages.

[0244] Indeed, the dental device 1 provides a completely advanced fastening solution compared to the existing state-of-the-art solutions, which require specific operations by a professional operator.

[0245] Specifically, the most notable advantage is that the assembly and disassembly of the connection means 3 is very quick and does not require particular skills.

[0246] Thus, the device 1 enables any user to perform maintenance cycles more frequently and independently of specialized centres.

[0247] As a result, another important advantage is the reduction in both the likelihood of gum infection for the user and the number of emergencies caused by such infections. It is important to highlight that the dental device 1 allows for a removable dental prosthesis with the same efficiency in terms of stability as fixed prostheses, but without requiring mucosal support, relying exclusively on implants.

[0248] Moreover, despite its extremely efficient coupling, the configuration of the joint 4 allows the inclination of the locking axis 3a relative to the main axis 2a to be varied and consequently, inclined implants can be created without constraints, as shown in Fig. 20.

[0249] Additionally, the device 1 , when in a fully magnetic configuration, eliminates the use of springs, which can lead to significant issues regarding the longevity and maintenance of the device itself.

[0250] The provision of a magnetic force onto the slider and the fact that it inserts into a through-hole results in a highly efficient dental device 1 , which cannot under any circumstances be removed from the mandibular or maxillary bone structure without the assistance of external magnetic or electromagnetic means.

[0251] Furthermore, the dental device 1 is extremely stable and, at the same time, has a reduced, if not negligible, likelihood of seizing during the disconnection or connection of the coupling mechanisms. Stability is advantageously provided effectively by the resistant means 7 through the preload defined by the resistance R.

[0252] Specifically, in this sense, the preload eliminates unintended movements of the dental prosthesis relative to the gum, particularly in relation to the osseointegrated implant on the gum, naturally when the device is in use, and always ensures that the internal parts of the dental device 1 remain always mobile and cannot become stuck or cemented to other parts, for example, due to thermal alterations of components that can generate friction.

[0253] Thus, the preload also prevents the risk of seizure in cases of very tight tolerances. Additionally, if the resistant means 7 are present between the joint 4 and the body 5 having the shape of a gasket, they also provide an antibacterial effect, further improving the efficiency and durability of the device 1 , reducing the frequency of periodic maintenance required to ensure the correct and safe functioning of the device 1 in use, as the components that ensure its proper functioning are “shielded” by the resistant means 7.

[0254] The invention is subject to variations within the scope of the inventive concept defined by the claims.

[0255] For example, the guide 50 could be open on both sides and lack a bottom. In this configuration, the device 1 could include caps designed to block the guide 50 when needed. Moreover, the device 1 could also include a hybrid configuration wherein the elastic element 62 and the component 61 coexist. Furthermore, the elastic and magnetic forces, respectively generated by the elastic element 62 and the component 61 , could work together or be configured to work in opposition, for example, depending on the side whereon the component 61 is positioned or its polarization relative to the slider 60.

[0256] In this context, all details are replaceable with equivalent elements, and the materials, shapes, and dimensions can be any.

Claims

C LAI M S1. Dental device (1 ) comprising at least:- an implant-type support (2) configured to be fastened to a bone portion of a user and defining a locking axis (3a);- connection means (3) configured to operatively interconnect said support (2) and a dental prosthesis (10) in a fixed manner along said locking axis (3a), defining at least one locking configuration in which said support (2) and said prosthesis (10) are securely fastened, and including:- a joint (4) comprising at least a first portion (4a) extending predominantly along a direction parallel to said locking axis (3a),- a body (5) comprising a guide (50) extending along a guiding direction (5a) transverse to said locking axis (3a) and a cavity (51 ) extending in a direction parallel to said locking axis (3a) and suitable for housing said first portion (4a) at least when said connection means (3) are in said locking configuration,- obstruction means (6) comprising a slider (60) loosely housed within said guide (50);- one of said joint (4) or said body (5) being fastened to said support (2) and the other of said joint (4) or said body (5) being configured to be fastened to said prosthesis (10);- said first portion (4a) comprising a hole (40) substantially aligned with said guide (50) when said connection means (3) are in said locking configuration, so as to allow said slider (60) to be inserted into said hole (40);- said obstruction means (6) being configured to exert a force on said slider (60) to move said slider (60) along said guiding direction (5a) within said guide (50) such that at least part of said slider (60) enters said hole (40) when said connection means (3) are in said locking configuration, thereby obstructing reciprocal movement between said joint (4) and said body (5); and said device (1 ) being characterized by further comprising:- resistant means (7) configured to generate, at least when said connection means(3) are in said locking configuration, a resistance (R) transverse to said guiding direction (5a) and suitable for resisting the approach of said body (5) to said joint(4).

2. Device (1 ) according to claim 1 , wherein said resistant means (7) comprisea gasket arranged between said joint (4) and said body (5) at least when said connection means (3) are in said locking configuration.

3. Device (1 ) according to any of the preceding claims, wherein said joint (4) comprises a second portion (4b) defining an annular element centred along said locking axis (3a) and including a cavity (45), and said resistant means (7) comprise a block (70) housed in said cavity (45) and movable or elastically deformable at least along said locking axis (3a).

4. Device (1 ) according to any of claims 2-3, wherein said block (70) comprises elastomeric material and / or said resistant means (7) comprise a thrust element (71 ) configured to transmit at least part of said resistance (R) to said block (70) as an elastic resistance or magnetic repulsion.

5. Device (1 ) according to any of the preceding claims, wherein said slider (60) comprises a ferromagnetic central portion (60a) and a coating (60b) arranged around at least part of said central portion (60a) and including a hard stone, either natural or synthetic.

6. Device (1 ) according to at least claim 2, wherein said second portion (4b) is conical around said locking axis (3a) and converges toward said body (5) at a first convergence angle (a1 ) between 3° and 20°.

7. Device (1 ) according to the preceding claim, wherein said body (5) comprises a conical housing (53) suitable for containing said second portion (4b) and defining a second convergence angle (a2), measured relative to an axis parallel to said locking axis (3a), equal to or less than said first convergence angle (a1 ).

8. Device (1 ) according to any of the preceding claims, wherein said force exerted on said slider (60) is magnetic or elastic.

9. Device (1 ) according to any of the preceding claims, wherein said force is a magnetic force of attraction or repulsion, and said obstruction means (6) comprise a component (61 ) fastened within said body (5) so as to face or be part of said guide (50) and configured to generate said magnetic force of reciprocally attraction or repulsion with said slider (60), such that when said connection means (3) are in said locking configuration, said slider (60) is pulled toward or repelled from said component (61 ), is inserted into said hole (40), and obstructs reciprocal movement between said joint (4) and said body (5).

10. Device (1 ) according to the preceding claim, wherein said component (61 )is fastened within said body (5) so as to face said guide (50) and is separated from said guide (50) by said cavity (51 ), generating said magnetic attraction force with said slider (60).

11. Device (1 ) according to claim 9, wherein said component (61 ) closes or is part of said guide (50) and generates said magnetic repulsion force with said slider (60).

12. Device (1 ) according to any preceding claim, wherein said hole (40) is a through-hole such that when said connection means (3) are in said locking configuration, said slider (60) passes through said hole (40).

13. Device (1 ) according to any preceding claim, wherein said hole (40) is non-through and defines a groove made on a wall defined by said first portion (4a).

14. Device according to any preceding claim, wherein said first portion (4a) defines a wedge-shaped free end (41 ) configured to separate said slider (60) and said component (61 ) or said slider (60) and part of said body (5) when said first portion (4a) is inserted into said cavity (51 ).

15. Method for assembling a dental device (1 ) according to any preceding claim, wherein said support (2) is free or fastened to an artificial model of a bone portion, and said method comprises:- placing said first portion (4a) within part of said cavity (51 ) in an unlocked configuration such that said first portion (4a) pushes said slider (60) away from or toward said component (61 );- fully inserting said first portion (4a) into said cavity (51 ) such that said guide (50) aligns with said hole (40) and said slider (60) is pulled toward or pushed away from said component (61 ), is inserted into said hole (40), and obstructs reciprocal movement between said joint (4) and said body (5); and is characterized by comprising, during said insertion:- pushing along said locking axis (3a) said body (5) against said joint (4) by applying a pushing force exceeding said resistance (R) to bring said connection means (3) into said locking configuration and determine a preload defined by said resistance (R) on said device (1 ).

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