METHOD FOR MANUFACTURING A DENTAL RESTORATION KIT

Description

[0001] The present invention relates to a method of manufacturing a dental restoration assembly intended to be fixed at one of its ends to a dental implant integrated into a bone structure of an individual.

[0002] Dental restoration allows for the creation of artificial teeth for a partially or completely edentulous patient. It is based on the integration of one or more implants into the bone structure, made by an incision in the gum in order to reach the bone structure and pierce it. Then, a healing element of a temporary dental restoration set is generally fixed on an implant and this set remains untouched until the implant is solidified in the bone structure by osseointegration and healing of the gum around the healing element. The dental restoration can be finalized by fixing a restoration abutment on the implant, on which a definitive dental prosthesis is fixed. The abutment and the dental prosthesis are personalized, adapted to the anatomy of the patient and the tooth to be replaced, to achieve a result as close as possible to the ideal natural dentition.For this, the precise volume of the space to be restored is generally taken into account, by taking an impression, which allows the personalized manufacture of the definitive dental prosthesis.

[0003] In the state of the art, existing methods of dental restoration encounter all or part of the following technical problems: in many existing processes, a new intervention on the gum is carried out after its healing following the implant placement, to make the impression, material or digital, of the space to be restored, while having a view of the implant and the gum to take into account precisely all of this geometry, with the aim of manufacturing an abutment and a prosthesis of precise shapes: this approach is naturally traumatic; other existing processes limit this trauma by using healing components which are not removed during an impression taking, so as not to hit the gum: in return, these processes use particular healing elements, generally of a substantially cylindrical shape and in any case standardized, and sometimes integrating indicators and / or several complementary components to allow the taking into account all or part of the geometry above the implant,without having full access to it by taking an impression. These less traumatic methods then have other disadvantages, of complexity and / or less good optimization of the healing phase; an advantageous implementation of the principle mentioned above is described in document WO2016066516. In this implementation, healing components of anatomical and standardized shape are used, allowing better optimization of the healing phase. A healing component is then chosen from a collection of healing components of various shapes to best define the healing shape of the gum most suited to the definitive dental prosthesis. However, given the diversity of existing dental anatomies, a healing component, even of anatomical shape, is not perfectly adapted to each situation. For example,special cases of particularly inclined implants cannot be managed by such an approach. This limitation is all the greater since there are only a limited number of standardized models of healing components, to facilitate their automatic recognition during the dental restoration phase, and not to overly complicate the logistical aspects of production, storage, etc., The document US2014 / 080092 describes a dental restoration process for designing a definitive dental prosthesis by reproducing or correcting the geometry of a temporary dental prosthesis, the latter being produced before the placement of an implant and before the decayed tooth is removed.

[0004] Thus, a general object of the invention consists of a method of manufacturing a dental restoration assembly which does not include all or part of the disadvantages of the state of the art.

[0005] More specifically, a first object of the invention is a dental restoration solution which minimizes patient trauma during the dental restoration process.

[0006] A second object of the invention is a dental restoration solution which allows for a restoration which is as adapted as possible to the patient's anatomy.

[0007] A third object of the invention is a dental restoration solution that is as universal as possible, suitable for any implant and any restoration.

[0008] A fourth object of the invention is the simplest possible dental restoration solution.

[0009] A fifth object of the invention is a method for manufacturing a dental restoration assembly that is as aesthetic as possible.

[0010] To this end, the invention is based on a method of manufacturing a temporary dental restoration assembly intended to be fixed at one of its ends to a dental implant integrated into a bone structure of an individual, characterized in that it comprises: a first step of taking a first digital impression of a buccal space of the individual, intended to accommodate the temporary dental restoration assembly, and a second step of constructing a first virtual three-dimensional model of a temporary dental restoration assembly based on the first digital impression, and a third step of constructing a database comprising digital data defining the first virtual three-dimensional model and identification data of the individual for whom the actual temporary dental restoration assembly corresponding to the first virtual three-dimensional model is intended to be placed in the mouth.

[0011] The first step in taking a first digital impression involves taking an impression of a buccal space above an implant

[0012] The database may include digital data of multiple virtual first three-dimensional models of provisional dental restoration assemblies, each associated with an identifying data item, and each first three-dimensional model in the database may be custom-designed and unique, distinct from other first three-dimensional models in the database.

[0013] The manufacturing method comprises a fourth step of manufacturing the actual temporary dental restoration assembly from the first virtual three-dimensional model, by transmitting the corresponding digital data to a manufacturing device by removing material and / or by adding material.

[0014] The temporary dental restoration kit may include a gum healing element and / or a dental prosthesis.

[0015] The temporary dental restoration assembly may be a single piece or constituted by the assembly of several elements, in particular comprising an abutment base intended to be fixed on the one hand to the implant and on the other hand to a healing cap or to a dental prosthesis, and / or in particular comprising a healing cap and a removable prosthesis or a scanning element mounted in a removable or non-removable manner on said healing cap.

[0016] The temporary dental restoration assembly may include a healing area with a transverse section having a trapezoidal or polygonal shape.

[0017] Also disclosed is a method of manufacturing a definitive dental restoration set for an individual, characterized in that it implements a method of manufacturing a temporary dental restoration set as described above, and: optionally a fifth step of entering an individual's identification data and reading from the database the digital data of the first three-dimensional model corresponding to the temporary dental restoration assembly worn by the individual; a sixth step of taking a second digital impression of the individual's oral space at the level of his temporary dental restoration assembly fixed on an implant, kept in the mouth during said second digital impression of the oral space, and a seventh step of determining the oral space to be restored, including the space not directly visible including the positioning and orientation of said dental implant, from the second digital impression and the first three-dimensional model, and an eighth step of constructing a second three-dimensional model of a definitive dental restoration assembly, taking into account the oral space to be restored established in the previous step.

[0018] The sixth step of taking a second digital impression of the buccal space may include taking the impression with an impression-taking element removably attached to the temporary dental restoration assembly.

[0019] The seventh step of determining the oral space to be restored may include: superposition of the first virtual three-dimensional model on the digitized temporary dental restoration model; and deduction of the oral space not directly visible, including the positioning and orientation of the implant and on which the temporary dental restoration assembly and the transmucosal part are fixed.

[0020] The manufacturing method may include a ninth step of manufacturing all or part of the final dental restoration assembly based on the second three-dimensional model.

[0021] These objects, characteristics and advantages of the present invention will be explained in detail in the following description of a particular embodiment made without limitation in relation to the attached figures among which: There figure 1 is a flowchart representing a method of manufacturing a dental restoration assembly according to one embodiment of the invention. The figures 2 to 5 illustrate steps of digitizing an oral space in a first phase of a method of manufacturing a dental restoration assembly according to an embodiment of the invention. The figures 6 to 9 illustrate steps for designing a temporary dental restoration assembly of a method for manufacturing a dental restoration assembly according to the embodiment of the invention. The Figures 10 and 11illustrate steps of manufacturing a temporary dental restoration assembly of a method of manufacturing a dental restoration assembly according to the embodiment of the invention. The figures 12 and 13 illustrate the result obtained after installation of a temporary dental restoration assembly obtained by a method of manufacturing a dental restoration assembly according to the embodiment of the invention. The figure 14 illustrates steps in scanning an oral space in a second phase of a manufacturing process for a definitive dental restoration set. figures 15 to 18 illustrate steps in manufacturing a final dental restoration assembly of a process for manufacturing a dental restoration assembly. The figures 19 and 20 illustrate steps in manufacturing a final dental restoration assembly of a method for manufacturing a dental restoration assembly. The figure 21depicts an exploded perspective view of a temporary dental restoration assembly in an alternative embodiment of a method of manufacturing a dental restoration assembly according to the embodiment of the invention. figure 22 illustrates a sectional view of a temporary dental restoration assembly fixed in the mouth according to the alternative embodiment of the invention. The figure 23 represents a view of the section of a healing zone of a temporary dental restoration assembly according to the embodiment of the invention. The figure 24 illustrates a sectional view of a temporary dental restoration assembly fixed in the mouth according to another alternative embodiment of the invention. The figure 25 represents a perspective view of a healing element according to the other variant of the embodiment of the invention. The figures 26 to 39illustrate steps of manufacturing a dental restoration assembly according to a variant of the embodiment of the invention.

[0022] To simplify the description, the same references followed by a " ' " will be used to designate virtual elements in relation to corresponding real elements. These virtual elements will be defined by digital data, and represented on a screen of a human-machine interface of a computer implementing the method of the invention.

[0023] The invention will be illustrated from the description of a method of manufacturing a dental restoration assembly, which will sometimes be more simply called a dental restoration method, schematically represented by the figure 1 and detailed by the figures 2 to 20This process comprises two phases P1, P2: a first phase P1 called healing during which one or more implant(s) are integrated into the patient's bone structure by osseointegration, and during which a temporary dental restoration set is designed "custom-made", manufactured and then placed on the implant(s), then a second phase P2 of restoration as such, during which a definitive dental restoration set, designed in the same "custom-made" way, is manufactured and then placed on the implant(s), replacing the temporary restoration set. During the first phase P1 of the process, a healing period therefore takes place, during which the gum heals, and during which at least one implant welds to the bone by a phenomenon of osseointegration.This dental restoration process ultimately requires the implementation of a manufacturing process for a definitive dental restoration assembly, this assembly being fixed to at least one implant during the second phase of the dental restoration process.

[0024] We will now detail the dental restoration process.

[0025] The first phase P1 of the dental restoration process mainly includes four steps: a first step E1 of taking at least a first digital impression S1 of a buccal space intended to accommodate a temporary dental restoration assembly 100, represented by the figures 3 to 7 ; a second step E2 of constructing a first three-dimensional model D1 of all or part of the temporary dental restoration assembly 100 based on the first digital impression S1, represented by the figures 8 and 9; a third step E3 of constructing a digital file or database D comprising the first three-dimensional model D1 and an associated identification data D2, represented by the figure 10 ; and a fourth step E4 of manufacturing the temporary dental restoration assembly 100 based on the first three-dimensional model D1, represented by the figure 11 .

[0026] It is particularly interesting to note that the first phase P1 of the dental restoration process thus includes the “custom-made” manufacture of a temporary dental restoration set, perfectly adapted to the oral geometry of a patient.

[0027] The first step E1 can be carried out directly after a preliminary step of placing an implant, the result of which is illustrated by the figure 2 .

[0028] The first step E1 of taking a digital impression S1 is obtained by any device such as an oral scanner 110 for example. The first digital impression S1 comprises a representation of the oral volume in which the temporary dental restoration assembly will be integrated. It is obtained by scanning the profile of the gum 63, represented by the figure 3 , completed by a digitalization of the same space, carried out after screwing onto the implant a digital impression-taking component 111, as represented by the Figures 4 and 5 . The digitized oral space therefore concerns the volume left free by the tooth(s) to be replaced, after its or their removal. Digitization therefore makes it possible to detect and digitize the gum and neighboring teeth. This oral space is also created after having already positioned the implant(s). Digitization thus makes it possible to digitize a precise volume arranged above an implant already positioned in the mouth.

[0029] There figure 6 represents the image obtained by scanning the oral area to be restored with this impression-taking component 110. The figure 7 consists of superimposing a virtual impression component 111', originating from a digital library, the dimensions of which correspond to the real impression component 111 used during the scanning represented in Figure 5during the first step E1. This component superposition is carried out virtually, using the assistance of a human-machine interface, for example by manually identifying three identical particular points on the virtual impression-taking component 111' and on the image of the corresponding real impression-taking component 111 on the screen of the human-machine interface. This operation makes it possible to deduce the position and orientation of the implant 60, as well as the transmucosal space hidden within the gum, not directly visible by scanning only the buccal space of the figure 3 .

[0030] Finally, the first step E1 therefore makes it possible to determine the positioning and / or the shape of the implant 60, and / or the positioning and / or the shape of the gum 63, and / or the positioning and / or the shape of at least one tooth adjacent to or facing the temporary dental restoration assembly 100. The first digital impression S1 is automatically transmitted to a computer equipped with dental restoration software, which manages the human-machine interface and the aforementioned operations of an operator.

[0031] The software, assisted or not by a practitioner, can then design a first three-dimensional model D1 of all or part of the temporary dental restoration assembly, in the second step E2 of the process, as illustrated by the figures 8 to 10, since he knows perfectly the geometry of the oral space to be restored around the implant 60. This temporary dental restoration assembly can take several forms and include one or more elements, as will be detailed later. In the embodiment described and shown, this assembly, represented by the figure 11 , is monobloc and includes a pillar 1 for its fixation on an implant in its lower part, a healing zone 10 in its intermediate part and a temporary prosthesis 30 in the upper part, approaching the shape of a real tooth. The three-dimensional model D1 of the temporary dental restoration set therefore corresponds to a digital representation, custom-designed to fit perfectly into the patient's free oral space, from the implant, within the gum and between one or more adjacent or facing teeth. The figure 10corresponds to a graphic representation of the digital data of the first three-dimensional model D1, this representation therefore corresponding to the virtual 100' temporary dental restoration set

[0032] Then, the method implements the third step E3 which comprises the development of a database D, or more generally a storage of digital data in an electronic memory, which notably comprises the digital data defining the first three-dimensional model D1 described above, associated with an identification data D2 making it possible to make the link with the individual concerned by the dental restoration. This identification data may comprise for example a name of the person concerned, and / or an identification number of this person, such as for example a social security number. The database D may comprise other data, such as a tooth number to be treated in the jaw of the person, according to a given convention. As a remark, the database D may be recorded in a memory of the computer or on a remote data server, connected to the computer.

[0033] In addition, the database D may also include an identification of the type of temporary dental restoration set, and / or the type of certain standard elements used in the temporary dental restoration set. Finally, the digital file D may also include a three-dimensional model of the shape and / or position of at least one tooth adjacent to or facing the dental restoration set and / or any information useful to the practitioner concerning the restoration of this tooth. These data may in whole or in part be used in the manufacturing process of the temporary dental restoration set and / or the definitive dental restoration set.

[0034] Finally, the method implements a fourth step E4 of manufacturing the actual temporary dental restoration assembly 100 corresponding to the first three-dimensional model D1, from the digital data of the database D. For this manufacturing, the computer can transmit the digital data file corresponding to the first three-dimensional model D1 to a manufacturing device, capable of reading this file and automatically launching the corresponding manufacturing, by removing material, for example using a machining device, or by adding material. The temporary dental restoration assembly 100 obtained, shown in the figure 11 , after any additional finishing operations, such as polishing for example, is then fixed to the implant 60.

[0035] The result obtained is represented by the figures 12 and 13. The temporary dental restoration assembly 100 is fixed to the implant 60 by means of a screw 115 passing through a central interior opening along its entire length. This assembly has the function of inducing the healing of the gum around its healing zone 10, and of forming a temporary tooth by the prosthesis 30 imitating the shape of a tooth, thus forming an aesthetic appearance to this temporary, provisional restoration. This temporary dental restoration assembly 100 being custom-designed, its healing function and its aesthetic function are implemented optimally for each person treated, regardless of their oral configuration.

[0036] In addition to the advantages described above, the provisional dental restoration assembly allows the implementation of the second phase P2 of dental restoration during which a definitive dental restoration assembly is designed, manufactured and placed with minimal trauma to the gum 63.

[0037] The second phase P2 of the dental restoration process, implemented after a period of healing of the gum 63 and / or osseointegration of the implant 60, mainly comprises the following steps: a fifth step E5 of identification of the temporary dental restoration assembly 100 present in the mouth. It can be done by an identifier linked to the person treated. This step finally comprises the identification of at least one data item of the digital file D, which makes it possible to obtain the first three-dimensional model D1 corresponding to the temporary dental restoration assembly 100 of the person; a sixth step of taking a second digital impression E6 S2 of the oral space comprising the temporary dental restoration assembly 100 fixed in an implant 60; a seventh step E7 of determination of the oral space, comprising the detection of the positioning and orientation of the implant 60, according to the second digital impression S2 and the digital data of the temporary dental restoration assembly 100 associated with the identification data D2, and therefore with the individual concerned by the dental restoration.As a note, this determination is carried out without removing the temporary dental restoration element, which limits the trauma for the patient; an eighth step E8 of construction of a second three-dimensional model F1 of all or part of the definitive dental restoration assembly, based on the information obtained by the previous steps; and a ninth step E9 of manufacturing the definitive dental restoration assembly from the second three-dimensional model F1.

[0038] During the identification step E5, a practitioner indicates an identification data item for the person concerned, via a human-machine interface, which will be compared to a set of identification data contained in the database D. Specifically, the practitioner can, for example, enter the patient's name (or their social security number). This identification data item generates a search among the identification data D2 stored during the first phase P1 of the process, which allows access to the first three-dimensional model D1 containing the digital data relating to the temporary dental restoration set 100 of the person concerned.

[0039] The sixth step E6, represented by the figure 14, includes taking a digital impression S2, for example obtained by any device such as an oral scanner 110 for example. This second digital impression S2 includes a representation of the oral volume in which the final dental restoration assembly will be integrated. As a note, this step is carried out with the presence of the temporary restoration assembly 100. This second digital impression S2 is close to the first digital impression S1 made in the first phase P1 and could almost be optional. However, it is strongly recommended since it allows taking into account the new shape of the gum 63 after healing, and a possible displacement of the assembly.

[0040] There figure 15represents the image obtained on a screen by scanning S2 of the oral area to be restored, as well as a virtual 100` temporary dental restoration set, corresponding to the first three-dimensional model D1 identified in the previous step. The rest of the process, represented by the figure 16 , includes a step E7 of determining the area not directly visible in the oral space.

[0041] According to this embodiment, this step consists of superimposing the virtual temporary dental restoration assembly 100' on the image of the real digitized temporary dental restoration assembly 100. This superposition of components is carried out virtually, using the assistance of a human-machine interface, for example by manually identifying three particular identical points on the digitized image and on the virtual component.

[0042] After the correct positioning of the virtual temporary dental restoration assembly 100`, the precise knowledge of its external shape makes it possible, by an automatic calculation by software of the restoration system, to deduce useful information on the area not directly visible from the oral space by the second scan S2, including in particular the position and orientation of the implant 60 on which the temporary dental restoration assembly 100 is fixed, as well as the transmucosal part, that is to say the space hidden within the gum around the healing area of ​​said temporary dental restoration assembly 100.At the end of this seventh step E7, the oral area to be restored is perfectly known, by the association on the one hand of the digital data of the second digital impression S2, and / or of the first digital impression S1, which are sufficient to provide the information on the visible space, and on the other hand of the digital data obtained indirectly from the first three-dimensional model D1 stored, as explained above, which completes the information by providing information on the space not directly visible, up to the implant.

[0043] In an alternative embodiment, software could autonomously and automatically carry out the superposition of components, without assistance from an operator.

[0044] In an eighth step E8, when the restoration software has accurately determined the oral space to be restored, including the parts not directly visible up to the positioning and orientation of the implant, it deduces from this knowledge the final geometry of the definitive dental restoration assembly to be manufactured, which must be fixed to the implant and occupy the entire gingival volume, then the geometry of the definitive dental prosthesis intended to imitate the aesthetic appearance of the missing tooth. The definitive dental restoration assembly must naturally restore as best as possible the function of the missing tooth, particularly chewing, as well as its external appearance. At the end of this eighth step E8, a second three-dimensional model F1 of a definitive dental restoration assembly is available. This dental restoration assembly can include standard elements and custom-made elements such as a definitive dental prosthesis.

[0045] As a note, this restoration process can be done completely digitally, therefore virtually, and / or completely automatically or preferably through the assistance of a practitioner, using his know-how through a human-machine interface, as illustrated by the figures 17 and 18 . In this example of dental restoration, a definitive abutment 40 intended for fixation in the implant 60 is defined, then the definitive dental prosthesis or crown 70, intended for fixation on this abutment 40, is drawn and virtually defined.

[0046] Alternatively, this construction of the definitive restoration may include phases of construction of a plastic or plaster model. In the latter case, a physical impression, for example in silicone, can be made, or an impression automatically manufactured from the digital data obtained from the oral space. A plaster cast can be poured into the impression to create the master model, that is to say a replica of the dental arch to be restored, which is then used as part of the traditional restoration. At the end of this step, the definitive restoration model possibly manufactured is digitized.

[0047] In all cases, step E8 allows the obtaining of digital data corresponding to a second three-dimensional model F1 of a definitive dental restoration set.

[0048] Finally, the method implements a ninth manufacturing step E9 of the actual definitive dental restoration assembly 200, from the digital data file corresponding to the second three-dimensional model F1. For this manufacturing, the computer can transmit the corresponding digital data file to a manufacturing device, capable of reading this file and automatically launching the corresponding manufacturing, by removing material, for example using a machining device, or by adding material. figure 19 represents as an example the production of the crown 70 from the machining of a block of material with an initial parallelepiped shape. The figure 20 illustrates the final dental restoration assembly 200 obtained, after assembly of the crown 70 and the abutment 40.

[0049] Finally, it is clear from this second phase of the process that the restoration is made with minimal trauma. Indeed, the manufacturing of the definitive dental restoration assembly 200 is carried out without temporary removal of the provisional dental restoration assembly, without disturbing the still fragile healing of the gum. In addition, since the provisional dental restoration assembly has been custom-designed, the healing of the gum is carried out in the most anatomical shape possible, as close as possible to the final restoration, which allows for continuity of healing and / or adhesion of the gum 63 without disturbance around the definitive restoration assembly 200.

[0050] The dental restoration process therefore implements a manufacturing process for a dental restoration assembly, which is broken down into two phases P1, P2.

[0051] Phase P1 is in itself essential and important. It implements a process for manufacturing a temporary dental restoration assembly intended to be fixed at one of its ends to a dental implant integrated into a bone structure of an individual, which comprises the following steps: a first step E1 of taking a first digital impression S1 of an oral space intended to accommodate the temporary dental restoration assembly, and a second step E2 of constructing a first virtual three-dimensional model D1 of a temporary dental restoration assembly based on the first digital impression S1, and a third step E3 of constructing a database D comprising digital data defining the first three-dimensional model D1 and identification data D2 of the individual for whom the actual temporary dental restoration assembly corresponding to the first three-dimensional model D1 is intended to be placed in the mouth.

[0052] By adding the second phase P2 of the method, a method for manufacturing a definitive dental restoration assembly 200 is disclosed, implementing the following steps: a fifth step E5 of entering an identification data D2 of the individual and reading in the database D the digital data of the first three-dimensional model D1 corresponding to the temporary dental restoration assembly 100; a sixth step E6 of taking a second digital impression S2 of the oral space of the individual at the level of his temporary dental restoration assembly fixed on an implant 60, kept in the mouth, and a seventh step E7 of determining the oral space to be restored, including the space not directly visible including the positioning and orientation of said dental implant 60, from the second digital impression S2 and the first three-dimensional model D1, and an eighth step E8 of constructing a second three-dimensional model F1 of a definitive dental restoration assembly 200, taking into account the oral space to be restored established in the previous step.

[0053] The invention also relates to a dental restoration device, implementing all or part of the manufacturing steps of a dental restoration assembly described previously.

[0054] Such a dental restoration device comprises a central processing and control unit, here comprising at least one microprocessor, linked to an electronic memory, on which software is executed which allows the implementation of all or part of the steps of the restoration method described above. This central unit is linked by a communication device to a module for obtaining digital data representing all or part of a patient's dentition, which may consist of a device such as a buccal scanner and / or to a remote data server. It is also linked to a human-machine interface, comprising for example a screen and / or a keyboard, to allow exchanges with a practitioner, as explained above. The central unit then carries out all the necessary processing, calculations and others, by software means.It is finally capable of generating and transmitting manufacturing commands to a device for manufacturing a dental restoration assembly, in particular components such as a restoration abutment and / or a prosthesis. It can be linked to a manufacturing device by material removal, such as a machining machine, or by material addition, such as a 3D printer. The manufacturing device can be capable of manufacturing all or part of the temporary dental restoration assembly and / or all or part of the definitive dental restoration assembly.

[0055] Naturally, the invention is not limited to the temporary dental restoration assembly described in the preceding embodiment. This assembly may be a single piece or be presented in several separate assembled components.

[0056] In particular, the temporary dental restoration assembly may comprise a first component or abutment base 1, and a separate healing element 10 intended for assembly on the abutment 1. This healing element may be in the form of a healing cap, the shape of which is substantially restricted to the gingival volume, to be limited to the healing function. Such a cap thus comprises a small volume emerging part. An example of such a construction is represented by the figure 21 .

[0057] In this example, the function of the cap or healing element 10 is to be housed within the incised gum, after fixing an implant, by fixing, preferably removable, on an abutment base connected to the implant. The final configuration is shown in the figure 22In this configuration, the implant 60 is secured to the bone part 62, the abutment base 1 is fixed on the implant 60, so that its collar 2 is positioned at the border between the bone part 62 and the gum 63. The cap 10 covers the abutment base 1 up to the collar 2, so that the gum 63 is almost exclusively in contact with the cap 10. The assembly formed by the assembly of a cap on a abutment base thus corresponds to a healing assembly, which temporarily participates in the restoration process, allowing healing and the smooth manufacture of the definitive prosthesis, as will be detailed later.

[0058] The gum 63 therefore heals around a lateral surface 13 of the cap 10. For this purpose, this lateral surface 13 is designed to correspond as closely as possible to the patient's oral environment. In particular, whatever the orientation or position of the implant in the bone portion 62, a custom-made cap can be perfectly adapted to the shape of the gum and to the shape of the adjacent or facing tooth(s). Such a cap is therefore unique because it corresponds to the patient's own anatomy.

[0059] There figure 24 illustrates a variant embodiment of the figure 22 , in which the healing element 10 is a one-piece cap, also called a healing pillar. This healing element 10 integrates the pillar base 1 of the figure 22 , thus includes a connection allowing it to be fixed directly to an implant 60. This healing element is shown alone in perspective from below on the figure 25 . In addition, the figures 26 to 39 schematically illustrate steps of the method of manufacturing a dental restoration assembly, similar to the method described in detail previously but based on a healing element 10 as shown in the figure 25 .

[0060] As a note, in this document, an adjacent tooth designates a tooth positioned on the same jaw and directly next to the tooth to be restored and an opposite tooth designates a tooth of the opposite jaw, likely to come against the tooth to be repaired when the jaw is closed. The upper terminal surface 14 of the cap is intended to remain visible above the gingival surface 64 of the gum 63, since the gum remains in full contact with the lateral surface 13 of the cap. As a note, the upper part of the lateral surface 13 and the terminal surface 14 therefore form an emerging surface of the cap.

[0061] According to another variant not illustrated, a healing cap, also called a healing abutment, is directly fixed on the implant 60, without the use of an intermediate abutment base. The healing cap then comprises a central opening, aligned with the axis of the implant, through which passes a screw holding the healing cap on the implant. Such a healing element is then monobloc, that is to say that it is made of a single piece and preferably from a single material.

[0062] According to another variant not illustrated, a healing cap of a temporary dental restoration assembly could comprise a connection device in its upper part, adapted for the removable connection of a scanning component of the type shown in figure 4, for its removable attachment to the healing cap during the sixth step of the second scanning S2 at the start of the second phase P2 of the dental restoration process. It could also, as a variant, comprise a connection device in its upper part, adapted for the removable connection of a temporary 60 or definitive 70 prosthesis.

[0063] Similarly, the final dental restoration assembly may have a different architecture than that described above, in one or more pieces. Furthermore, nothing precludes retaining some of the components of the provisional dental restoration assembly in the final dental restoration assembly.

[0064] The method comprises a software element that allows designing a dental restoration assembly, or a component such as a healing cap or a dental prosthesis. The first three-dimensional model D1 comprises a digital representation of all the elements forming the temporary dental restoration assembly, in particular the abutment base 1, the cap or abutment or healing area 10, and the prosthesis 30. These elements can be assembled together, in accordance with the assembly that will be carried out later on the implant. Being a standard element, the three-dimensional model of the abutment base 1 is also standard and can be retrieved from a data library stored in a memory of the computer.At least the three-dimensional model of the healing area is a tailor-made digital representation, i.e. designed to fit perfectly into the implant, into the gum of the person concerned and among one or more adjacent or facing teeth.

[0065] According to an essential approach of the invention, at least the healing zone of the temporary dental restoration assembly is custom-defined, uniquely and perfectly adapted to each individual treated. It follows that this healing zone always has an anatomical shape. The healing zone can be mounted on a standard abutment or also custom-designed. The possible temporary prosthesis is likewise custom-defined or among standardized shapes. It is noted that the transverse section of the healing zone by a plane perpendicular to its lateral surface has a particular anatomical shape.

[0066] Such a transverse section, which gives the final shape to the gum after healing, is advantageously of a substantially trapezoidal shape. With reference to the figure 23 , it comprises a large side 141, which will be arranged on the outside of the mouth (vestibular side), a small side 142 opposite parallel, which will be arranged on the inside of the mouth (lingual side), connected by two sides 143, 144. The crossing of the diagonals of the trapezium makes it possible to define a center 15. Advantageously, this center is intended for alignment with the axis of the implant 60.

[0067] The trapezoidal shape of the cross-section can vary, approaching a triangle, if its small side 142 is very small. The trapezium can also approach a rectangle, whose large side goes from the outside of the mouth to the inside, and corresponds to sides 143, 144. On the contrary, the trapeziums can approach a rectangle, or even a square, whose large side is in the opposite direction, and corresponds to sides 141, 142, which are of similar but slightly different lengths. Naturally, this substantially trapezoidal shape retained has rounded corners and curved sides, to ensure that it does not hit the gum.

[0068] In another embodiment, the cross-section could approximate any polygon, such as a three-, five-, or six-sided polygon whose dimensions are specifically adapted to the patient's oral environment. Alternatively, the angles of these polygons could be so rounded that the overall shape would approximate an oblong, or even an ovoid, or any other shape further removed from a polygon.

[0069] Advantageously, all or part of the temporary or permanent dental restoration assembly may be made of a material compatible with a rapid manufacturing method, available in the practitioner's office. For example, a healing element and / or a prosthesis may be made of a ceramic material or a plastic material, compatible with medical use, and of a pink, white or cream color. Alternatively, it may be made of metal, for example titanium, or may be made of zirconia. A healing element and / or a prosthesis may, for example, be produced by machining, in particular by three-dimensional milling from a block of material or by additive synthesis, i.e. by three-dimensional printing.

Claims

1. Method for manufacturing a temporary dental restoration assembly (100) intended to be attached, at one of its ends, to a dental implant (60) integrated in a bone structure (62) of an individual, characterized in that it comprises: - a first step (E1) of taking a first digital impression (S1) of an oral space of the individual, intended to receive the temporary dental restoration assembly (100), where the first step (E1) of taking a first digital impression (S1) comprises taking an impression of an oral space above an implant, and - a second step (E2) of constructing a first three-dimensional virtual model (D1) of a temporary dental restoration assembly (100) according to the first digital impression (S1), and - a third step (E3) of constructing a database (D) comprising digital data defining the first three-dimensional virtual model (D1) and an item of identification data (D2) of the individual in whose mouth the actual temporary dental restoration assembly corresponding to the first three-dimensional virtual model (D1) is intended to be placed, and - a fourth step (E4) of manufacturing the actual temporary dental restoration assembly (100) from the first three-dimensional virtual model (D1) and on the basis of the digital data of the database (D), by transmitting the corresponding digital data to a device for manufacture by removal of material and / or by addition of material.

2. Manufacturing method according to the preceding claim, characterized in that the first step (E1) of taking a first digital impression (S1) of an oral space comprises digitization of the profile of the gingiva, supplemented by digitization of the same oral space after a component (111) for taking a digital impression has been screwed onto an implant.

3. Manufacturing method according to one of the preceding claims, characterized in that the database (D) comprises digital data of several first three-dimensional virtual models (D1) of temporary dental restoration assemblies (100), each being associated with an item of identification data (D2), and in that each first three-dimensional model (D1) of the database (D) is customdesigned and unique, distinct from the other first three-dimensional models (D1) of the database (D).

4. Manufacturing method according to one of the preceding claims, characterized in that the temporary dental restoration assembly (100) comprises a gingival healing element (10) and / or a dental prosthesis (30).

5. Manufacturing method according to one of the preceding claims, characterized in that the temporary dental restoration assembly (100) is in one piece or is composed of several elements, comprising in particular an abutment base (1) intended to be attached on the one hand to the implant (60) and on the other hand to a healing cap (10) or to a dental prosthesis (30), and / or comprising in particular a healing cap (10) and a removable prosthesis or a digitization element mounted removably or non-removably on said healing cap (10).

6. Manufacturing method according to one of the preceding claims, characterized in that the temporary dental restoration assembly (100) comprises a healing zone whose transverse section has a trapezoidal or polygonal shape.