Zygomatic implant with partially interrupted threaded portion

Abstract

The present invention pertains to the field of odontological treatment components. It comprises a zygomatic implant having a partially interrupted threaded portion. Said implant (10) is defined by an elongated and cylindrical body (11) provided with a double screw thread (111). A conical apical region (12) of the implant (10) has a surface provided with a screw thread (121) and comprises at least three helical chambers (13) and a semi-spherical end (14). A cervical region (15) of the implant (10) is defined by a smooth cervical surface (15a). The edge of said smooth cervical surface (15a) is orthogonally attached to a perimeter and flat platform (16) that delimits the opening interspace of a prosthetic interface provided with at least one internal area with a hexagonal cross section (18). The elongated and cylindrical body (11) comprises at least one longitudinal stripe (112) having a smooth surface that interrupts the double screw thread (111). The double screw thread (111) is smoothly interrupted through a transition curvature (113), so that there are no cutting corners and cutting edges between the longitudinal stripe (112) and the portion provided with the double screw thread (111). The smooth longitudinal stripe (112) is located in the cervical portion of the zygomatic implant (10). The smooth longitudinal stripe (112) is aligned with one of the flat sides of the internal area hexagon (18) of the implant prosthetic interface. Sharp edges can cause mechanical irritation. The provision of a curved and gradual geometry, ensures the absence of sharp corners, which can cause mechanical irritation, and consequently, results in a safer and more comfortable configuration for patients.

Description

Descriptive Report of the Utility Model Patent for "Zygomatic implant with partially interrupted threaded portion."

[0001] This utility model relates to a dental device, more precisely to an implant designed to provide support for multiple prostheses used to replace missing maxillary teeth in a patient. More specifically, this utility model concerns a zygomatic implant that was developed with the aim of providing better installation conditions, greater mechanical stability, and greater comfort during use, when compared to similar devices known in the current state of the art. DESCRIPTION OF THE STATE OF THE ART

[0002] As is known to those skilled in the art, dental implants are osseointegrated components made of biocompatible materials (e.g., titanium and zirconia, among others) that are inserted / anchored into bone tissue with which they eventually integrate over time. The successful placement of such implants will be achieved if it promotes adequate primary and secondary stability, where: (i) primary stability represents the mechanical stability of the implant / bone assembly which, if achieved at the time of implant placement, may allow for the immediate placement of the prosthesis (a technique called immediate loading), and (ii) secondary stability represents the stability obtained by the adequate osseointegration of the implant after a certain period of time.

[0003] Specifically regarding zygomatic implants, these are medical devices used to fix multiple dental prostheses – usually full-arch implants – in patients with severe bone loss in the maxillary region. It should be noted that, under these conditions, the alternative to using zygomatic implants is... This would involve performing a bone graft beforehand, which requires a series of complex procedures, in addition to incurring a longer treatment time until the prosthesis can be effectively installed.

[0004] However, unlike conventional implants, zygomatic implants are installed with double anchorage, with the proximal anchorage in the patient's remaining maxillary bone and the apical anchorage in the zygomatic bone of the face – which forms part of the eye socket.

[0005] Figures 1.1 and 1.2 show examples of zygomatic anchorage in which it can be observed that, between the maxilla (M) and the zygomatic bone (OZ), there is a cavity commonly known as the maxillary sinus (SM). Therefore, after installation, the apical portion of the implant is inserted into the zygomatic bone, while the cervical portion remains inserted into the remaining maxillary bone / alveolar ridge. The intermediate portion of the implant, however, can be embedded in the bone, as occurs with implants 1 and 1' in Figure 1.1, pass through the maxillary sinus as with implants 2 and 2' in the same figure, or remain external to the zygomatic bone as with implant 3 in Figure 1.2, this technique being known as exteriorized placement.

[0006] Conventional zygomatic implants have threads (R) that cover their entire body, as illustrated in Figure 2. However, particularly in cases where the externalized placement technique is used (where part of the implant remains outside the bone structure), after the procedure the thread (R) of the intermediate portion of the body that passes through the maxillary sinus ends up interacting directly with the soft tissues of the face, potentially causing irritation and / or tissue inflammation. Additionally, the patient can feel the implant thread whenever, for any reason, their face is touched or pressed in the sinus region. jaw, which can be significantly uncomfortable.

[0007] In an attempt to reduce such inconveniences, zygomatic implants with differentiated external characteristics have emerged, such as the one revealed in document BRMU9101211-2 (Figure 3), which has an intermediate portion (IP) with a completely smooth and polished perimeter to increase comfort and also prevent the fixation of bacteria, since it has a surface roughness lower than the size of the bacteria. In this case, the threads are located in the cervical and apical regions of the implant.

[0008] US patent document 5,564,926 also describes an implant with a threadless medial portion, whose body consists of two cylindrical segments with distinct cross-sections, where the distal portion – which is installed in the zygomatic bone – has a smaller diameter than the proximal portion of the implant.

[0009] It is observed that in both the BRMU9101211-2 implant and the one described in document US5,564,926, after the threaded apical portion passes through the maxillary bone hole, insertion proceeds by simply pressing the implant in the direction of installation due to the smooth surface; however, during this process, deviations in the correct axial direction of the implant may occur, resulting from the mobility provided by the absence of a thread in its intermediate portion. This can hinder the immediate location of the pre-formed hole in the zygoma and, therefore, make installation difficult. Furthermore, any inaccuracies in the positioning and installation of the implant apex in the zygomatic bone may cause the cervical thread to unduly widen the maxillary bone hole, compromising the adequate primary stability of its final placement.

[0010] The implant revealed in document US9, 125,708 – which can be produced in metallic or ceramic material – has a portion The apical (PA) portion is threaded with a conical end (see attached Figure 4) to facilitate the identification and penetration of the implant into a previously shaped hole in the zygoma using a drill. The intermediate and cervical (PIC) portions of the implant have a completely smooth surface and a diameter equal to or less than the diameter of the threaded portion. The purpose of the smooth surface is to prevent irritation or damage to the adjacent soft tissue. However, when the diameter of the threaded apical portion of the implant is greater than the diameter of the cervical region, a small gap will appear in the mandibular hole relative to the smooth portion of the implant. This, in addition to the total absence of threads in the cervical region of the implant, compromises the adequate and desirable primary stability of the installation.

[0011] The implant revealed in document WO2011 / 063958 (Illustrated in the attached Figure 5) has a cylindrical, uncut, and substantially smooth "guide portion" (GP) at the apical end – although it may be provided with microscopic structures to facilitate osseointegration – which acts as a simple guide for the initial insertion of the implant into the bone to avoid deviations during installation. Therefore, it is an implant indicated for cases that demand a high degree of positioning precision. After this guide portion (GP), the implant is provided with self-tapping threads (SAT) to allow the installation and fixation of the implant in the bone base. The self-tapping characteristic of the threads is due to a longitudinal interruption (LI) present in the mid-apical portion of the implant, since this interruption allows the formation of tapered ends that assist in cutting the bone during rotation for its installation.Therefore, the interrupted thread region of the aforementioned implant should always be located in its apical portion to ensure that the first threads... The threads must be self-tapping (RAC) in order to allow the piece to be installed and properly fixed to the bone.

[0012] The use of an implant with such a configuration for fixation in the zygomatic bone can also cause significant subsequent discomfort to the patient, mainly due to the fact that the self-tapping threads (RAC) are tapered at the ends that delimit the longitudinal interruption (IL), and depending on their position after installation, they can be easily felt by the user and may even cause irritation and / or unwanted injuries.

[0013] It is noted, therefore, that the current state of the art lacks zygomatic implants that have a shape that prevents the device from being perceived when the user touches and / or presses the skin, but at the same time provides good installation conditions and adequate final stability. OBJECTIVES OF THE UTILITY MODEL

[0014] The present utility model therefore aims to solve the drawbacks observed in zygomatic implants known in the current state of the art, mainly with regard to the fact that such implants interact directly with soft tissues after the use of externalized installation techniques, which may cause irritation and / or tissue inflammation and be perceptible to the touch on the user's face.

[0015] Therefore, one of the objectives of this utility model is to reveal a versatile zygomatic implant, since it can be used regardless of the installation characteristic - externalized, embedded in the bone or internal to the maxillary sinus.

[0016] Additionally, one of the main objectives of the present utility model is to provide a zygomatic implant that is smooth and threadless in a longitudinal section of its mid-portion. cervical - more specifically in the region of your body that will not eventually be positioned inside bony structures after installation (i.e., it will be located externally to the maxillary sinus as observed in Figure 1.2) - but which, nevertheless, is capable of promoting adequate imbrication of the implant in the alveolar bone, thus ensuring the desired primary stability of the installation.

[0017] Another objective of the present utility model is to disclose a zygomatic implant that is threaded along its entire length, including the longitudinal section opposite the aforementioned smooth longitudinal section.

[0018] Additionally, one of the main objectives of this utility model is to provide a means for the operator to position the smooth portion of the zygomatic implant facing the front (vestibular) of the patient after installation, so as to keep it further away from the soft tissues and, thereby, significantly reduce the chances of tissue irritation and / or inflammation, as well as promoting less sensitivity to touch.

[0019] Finally, another objective of the present utility model is to provide a means for the transition between the smooth portion and the threaded position of the implant to be completely free of sharp edges, also aiming to improve user comfort and safety during use. SUMMARY OF THE UTILITY MODEL

[0020] The present utility model therefore refers to a zygomatic implant with a partially interrupted threaded portion, which is defined by an elongated and cylindrical body 11 provided with a thread 111; a conical apical region 12 with a threaded surface 121, said conical apical region 12 being provided with at least three helical chambers 13 and a semi-spherical end 14; and a cervical region defined by a smooth cervical surface 15 whose edge is solidly, orthogonally, to a perimeter and flat platform 16 that delimits the opening of a prosthetic interface provided with at least one internal section with a hexagonal cross-section 18.

[0021] In a preferred embodiment of the present invention, the elongated and cylindrical body 1 1 comprises at least one longitudinal strip 1 12 with a substantially smooth surface, said smooth longitudinal strip 1 12 being located in the cervical portion of the zygomatic implant 10; the connection between the threads 1 1 1 and the smooth longitudinal strip 1 12 being made by a transition curve 1 13, and the smooth longitudinal strip 1 12 being aligned with one of the flat faces of the internal section with hexagonal cross-section 18 of the prosthetic interface of the implant 10.

[0022] Preferably, the smooth longitudinal band 1 12 starts at the smooth cervical surface 15 and extends to the mid-region of the zygomatic implant 10 or, alternatively, said smooth longitudinal band 1 12 extends beyond the mid-region of the zygomatic implant 10.

[0023] Also according to a preferred embodiment of the present utility model, the prosthetic interface of the zygomatic implant 10 comprises a truncated cone region 17 with a progressively reduced diameter from the platform 16 towards the apex of the implant, a hexagonal region 18, and a cylindrical region provided with a female thread 19. Optionally, such prosthetic interface may comprise one of the following interfaces: Morse taper, external hexagon or internal hexagon.

[0024] It should be noted that in the preferred embodiment presented here, the surface of the smooth longitudinal strip 1 12 is recessed by a distance r in relation to the perimeter of the threads 1 1 1 .

[0025] Additionally, and according to a preferred embodiment of the present utility model, there may be at least A marker means disposed of on the zygomatic implant 10, said marker means indicating the position of the flat face of the internal section with hexagonal cross-section 18 of the prosthetic interface of the implant 10 corresponding to the positioning of the smooth longitudinal strip 112. It should be noted that the marker means may be located in one of the following locations on the zygomatic implant 10: platform 16, smooth cervical surface 15, or truncated cone region 17 of the prosthetic interface, and may comprise at least one of a color marking, an inscription, a protrusion or a recess.

[0026] Furthermore, preferably in the apical region 12 of the present zygomatic implant 10, the angulation ai of the thread 121 will be greater than the angulation 0C2 of the core, while the thread 111 should be cylindrical and with ridges parallel to the longitudinal axis of the core of the cylindrical body 11 in which it is located. It should be noted that the thread 121 of the apical region 12 comprises a substantially trapezoidal geometry (also known as an inverted Buttress thread) having some threads with a tapered ridge, while the thread 111 of the cylindrical body 11 comprises a trapezoidal geometry. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present utility model will now be described in more detail based on an example embodiment shown in the attached figures, which illustrate:

[0028] Figs. 1.1 and 1.2 - representations of the internal structures of the face showing the zygomatic bone, the cavities of the maxillary sinuses and the maxillary bone in which a multiple prosthesis (protocol; see fig. 1.1) is properly installed with the aid of zygomatic implants of the current state of the art;

[0029] Fig. 2 - an isolated view of a prior art zygomatic implant, which is threaded along its entire body;

[0030] Fig. 3 - a perspective view of another implant of the current state of the art, which has a smooth medial region of its body and is threadless;

[0031] Fig. 4 - another perspective view of an implant using the current technique, with threads only in its apical portion and the rest of its body (in the medial and cervical regions) completely smooth and without threads;

[0032] Fig. 5 - a side view of another implant from the current state of the art, which presents a longitudinal interruption in the apical region of its body, delimited by the ends of tapered and sharp threads;

[0033] Fig. 6 - a perspective view of a preferred embodiment of the zygomatic implant with a partially interrupted threaded portion - object of the present utility model;

[0034] Fig. 7 - an enlarged and partially sectioned detail of the cervical portion of the zygomatic implant shown in Figure 6, allowing observation of the alignment between the inner hexagon of the coupling interface and the region with the partially interrupted thread;

[0035] Fig. 8 - shows a side view of the cervical region of the zygomatic implant body of Figure 6, in which the partially interrupted thread is located, in total alignment and projection in relation to a top view that allows observation of the internal portion of the cervical end of the piece;

[0036] Fig. 9 - a side view of the object of the present utility model, with enlarged details of the threads existing in its apical and cervical portions,

[0037] Fig. 10.1 - a bottom view showing the apical end of the zygomatic implant object of the present utility model;

[0038] Fig. 10.2 - a lateral view of the apical portion of the implant The zygomatic bone is represented in Figure 6, emphasizing the difference in angle between the implant core and its thread;

[0039] Fig. 11 - an enlarged detailed view of the cervical end of the zygomatic implant presented herein;

[0040] Fig. 12 - a detailed enlarged side view of the core of the zygomatic implant of the present utility model, showing the shape of its smooth region as a result of the partially interrupted thread;

[0041] Figures 13 and 14 show cross-sections of the zygomatic implant of the present utility model (Figure 13) and the WO2011 / 063958 implant of the current state of the art (Figure 14), respectively, allowing comparison of the difference in transition between the smooth and threaded regions of the two versions; and

[0042] Fig. 15 - shows an enlarged detail of the cervical portion of the zygomatic implant, the subject of this utility model application. DETAILED DESCRIPTION OF THE UTILITY MODEL

[0043] The object of this utility model will now be described and explained in more detail based on the attached drawings, which are merely illustrative and not limiting, since adaptations and modifications can be made without departing from the scope of the claimed protection.

[0044] As previously mentioned, Figures 1 to 5 show zygomatic implants of the current state of the art, which were presented in the "Description of the state of the art" section at the beginning of this report.

[0045] Figure 6 illustrates a preferred embodiment of the zygomatic implant 10 of the present utility model, which is defined by: - an elongated and cylindrical body 11; - a conical apical region 12 covered by a thread 121, the said conical apical region 12 having at least three helical chambers 13 and a semi-spherical end 14; and - a cervical end defined by a smooth surface 15 that closes into a perimeter and flat platform 16 that gives the implant the characteristic of a straight interface.

[0046] The elongated, cylindrical body 11 is also provided with threads 111, except for a longitudinal strip 112 which has a substantially smooth surface – that is, no thread fillets pass through it. 111, given that they are interrupted on the periphery of that region. It should be noted that the illustrative drawings accompanying this application represent the preferred embodiment of the zygomatic implant 10 containing only one smooth longitudinal band. 112, however, experts in the field will realize that it will obviously be possible to use at least one more smooth strip on the body, in a symmetrical position to strip 112, provided that the ultimate goal of solving the drawbacks of the current technique is maintained.

[0047] In this respect, it should be clarified that the threads 111 – which will be double, presenting a trapezoidal profile – are interrupted smoothly, that is, through a transition curve 113, so that there are no sharp corners and cutting edges between the smooth longitudinal strip 112 and the threaded portion 111, as can be seen in the attached Figures 13 and 15. Furthermore, preferably the radius of this longitudinal strip 112 is 2.5 mm with its axis offset from the axis of the implant 10, which keeps the surface of the longitudinal strip 112 recessed at a distance r from the perimeter of the threads 111 and, therefore, further away from the internal tissues of the patient's face.

[0048] A comparative analysis between Figures 13 and 14 clearly shows how the interruption of the threads in the prior art generates blunt and sharp points (RAC). While the thread interruption of the present proposal is done gradually and, therefore, without the presence of sharp and / or blunt points. Furthermore, it is possible to observe that the thread interruption method of the state of the art maintains practically the same perimeter area as the rest of the implant, while in the zygomatic implant now presented, this area is significantly reduced and recessed, thus distancing the smooth longitudinal strip 112 from the soft tissues of the user's face as explained above.

[0049] It is important to highlight that, in the illustrative drawings accompanying this report, the aforementioned smooth longitudinal strip 112 begins immediately after the smooth cervical surface 15 of the implant 10. However, those skilled in the art will understand that such a smooth longitudinal strip 112 may extend in length and surpass the median region of the implant 10, or be located only in the cervical portion thereof, but away from the smooth cervical surface 15. Such positions do not interfere with the adequate anchorage conditions of the implant 10, since its effective interaction with the patient's bone regions will already have been guaranteed by the threads 121 of the conical apical region 12, and the initial thread fillets 111 of the cylindrical body 11 contiguous to the apical region 12.

[0050] The aforementioned smooth cervical surface 15 of the zygomatic implant tip 10 terminates in a perimeter platform 16, preferably orthogonal to its surface. This perimeter platform 16 delimits the opening of the prosthetic interface, whose longitudinal axis coincides with the axial axis of the implant, as shown in Figures 7 and 15 attached. From the platform 16 towards the apical region, this prosthetic interface is defined by: a truncated cone region 17 whose diameter is progressively reduced from the platform 16 towards the apex of the implant; a hexagonal region 18; and a cylindrical region provided with 19mm female thread for coupling and securing the appropriate prosthetic component (not shown).

[0051] It should be clarified that the preferred prosthetic interface described above is an example and can be replaced by any other type of interface known in the current state of the art, such as Morse taper, external hexagon, or internal hexagon, without thereby departing from the scope of protection claimed herein.

[0052] Figures 7 and 8 show that the longitudinal strip 112 of implant 10 is aligned / indexed to one of the straight faces of the hexagonal region 18 of the prosthetic interface, so as to allow the installer, at the end of the installation, to position the implant so that the unthreaded longitudinal strip 112 faces the patient's vestibular side, in order to avoid the inconveniences and discomforts previously described and, consequently, improve its use compared to similar implants known in the current art. As is known, with the use of zygomatic implants of the current state of the art, the user is able to feel the threads of the piece by applying any pressure to their face, which can cause discomfort, irritation and a bad impression.In the case of implants with a cutting interruption in the thread, such as that disclosed in document WO2011 / 063958 (whose cross-section is shown in attached Figure 14), there is the aggravating factor that the blunt edges of the threads – which are formed at the point of interruption – can cause injuries to the internal surface of the facial region covering the maxillary sinus area during potentially more intense external pressures. Therefore, the configuration presented here aims to ensure that, after implant placement, the user does not risk internal injuries or discomfort during any pressures applied to their face. Furthermore, the configuration disclosed here creates a recess r on the implant surface 10 that will face a. The user's vestibular system keeps it in a "deeper" position compared to conventional implants - and consequently, makes it inaccessible to gentler pressures on the face.

[0053] The identification of the face of the hexagonal region 18 that is indexed to the smooth longitudinal strip 112 can be done by associating the visualization of the already installed implant (remembering that the installation process of zygomatic implants involves the prior opening of a space for visualization of the maxillary sinus) with the use of a hexagonal installation key (not shown) provided with marking elements in positions corresponding to the straight faces, simply positioning the marker corresponding to the face of hexagon 18 that is aligned / indexed to the smooth longitudinal strip 112 of implant 10 towards the vestibular side of the patient.

[0054] Optionally, the face of the hexagonal region 18 that is indexed with the smooth longitudinal strip 112 can be identified on the implant itself 10 by means of any marker which, for example, can be a color marking, an inscription, a protrusion or a recess, and such marker can be located on the platform 16, on the smooth cervical surface 15, or on the truncated-conical region 17 of the prosthetic interface.

[0055] The zygomatic implant 10 can be produced in any diameter suitable for the function of use of the piece, and in the preferred embodiment presented here, this diameter measures 4.0 mm. Furthermore, its external thread 111, which has two entries on the right next to the smooth cervical surface 15, preferably has a trapezoidal profile as can be seen in the attached Figure 9 (i.e., it does not have a cutting characteristic), and in the cylindrical body portion 11 the height hi of the thread fillet 111 will preferably be 0.20 mm. The thread 121 of the apical region 12 will also have a substantially trapezoidal geometry (also known as (Inverted Buttress thread), some threads may have a more tapered crest than others, as shown in the enlarged detail of Figure 9, in order to better penetrate the bone during installation.

[0056] As previously mentioned, the apical region 12 has a substantially conical profile, featuring a semi-spherical end 14 and three helical chambers 13 evenly distributed around its perimeter (see Figure 10.1). Additionally, the thread 121 of this apical region 12 has a progressive increase in depth or height h2 - which will preferably reach a maximum value of 0.4 mm - in the cervical direction.

[0057] Furthermore, in the attached Figure 10.2, it can be seen that the angulation ai of thread 121 is more pronounced than the angulation a.2 of the implant core in the apical region 12, this conformation being intended to aid in the insertion and interaction of the piece with the zygomatic bone. Thus, the combination of a conical apical profile with a semi-spherical tip 14, helical chambers 13, and a progressive increase in the depth h2 of thread 121 contribute to promoting good apical anchorage and, consequently, to the primary stability of the implant.

[0058] Due to the fact that it is an implant for fixation in the zygomatic bone, it can be manufactured in a wide range of lengths, such as 30.0 / 35.0 / 37.5 / 40.0 / 42.5 / 45.0 / 47.5 / 50.0 / 52.5 and 55.0 mm, preferably in Pure Grade 4 Titanium (according to ASTM F67 standard "Unalloyed Titanium, for Surgical Implant Applications"), although other manufacturing materials such as Zirconia or biocompatible polymeric materials may alternatively be used. Furthermore, optionally, the implant 10 may have a differentiated geometry in the central region 141 of the semi-spherical end 14, as illustrated in Figure 10.2, to allow for proper coupling of the part to the packaging. which will contain it - it should be noted that in the preferred embodiment illustrated in the indicated drawing, the central region 141 is flat, but it may have other characteristics according to the requirements of the packaging to be used.

[0059] The smooth longitudinal strip 112 of the body 11 should, in the preferred embodiment presented here, begin at a distance di of 1.60 mm and end at a distance 62 between 16.0 and 16.5 mm from the platform 16 of the implant 10, as shown in the attached Figure 12 (which shows only the core of the body 11, without the threads 111). Additionally, in the cervical region, the thread 111 should end at a distance ch of, preferably, 2.0 mm from the platform 16, with a thread pitch p of around 0.65 mm (see Figure 9).

[0060] It is important to note that it will eventually be necessary to perform an additional torque-directed or counter-torque movement in order to position the aforementioned smooth longitudinal strip 112 in the desired position – that is, facing the patient's vestibular side. Considering that the most unfavorable positioning would occur when point O shown in the cross-section of Figure 13 is facing the vestibular side at the end of the installation, in the worst case it would be necessary to perform a complementary half-turn movement to properly position the longitudinal strip 112 towards the patient's vestibular side.

[0061] Therefore, using the preferred value of 0.65 mm for the thread pitch p, and since the implant will preferably be produced with a double thread, each 360-degree rotation of the implant will result in an advance of 1.30 mm. Thus, in the worst case, at the end of the installation, it will be necessary to apply a complementary torque or counter-torque of half a rotation, resulting, in the example considered, in a maximum complementary displacement of 0.65 mm. Therefore, the maximum displacement value required for the positioning of the band is... A longitudinal 112 in the patient's vestibular position corresponds to half the implant advancement.

[0062] The manufacture of implant 10, object of the present utility model - which consists of the operations of (i) dimensional transformation of the raw material, (ii) machining, (iii) sanitization and (iv) packaging - requires the use of a milling cutter with lateral cutting (not shown) to guarantee the geometry in the longitudinal strip 112 devoid of thread, and such tool must be able to repeat a curved transition profile 113 between the longitudinal strip 112 and the thread fillets 111 as represented in Figure 13.

[0063] For the use of the zygomatic implant 10, after preparing the installation site properly – which includes opening a space that allows visualization of the maxillary sinus and, consequently, of the implant itself – the operator must remove the implant from its packaging using the torque wrench that attaches to its prosthetic interface. This action will automatically position one of the wrench's marking elements corresponding to the face of the hexagonal region 18 that is aligned with the smooth longitudinal strip 112. Next, the implant 10 is positioned in the previously shaped hole using appropriate drills, and torque is applied to insert the implant.

[0064] At this point, it is important to clarify that throughout the implant installation, it will be necessary to rotate the implant, including when the partially interrupted threaded portion is inserted into the jawbone. This is due to the presence of thread 111 in the region posterior to that where the smooth longitudinal strip 112 is located (remembering that with the use of implants known in the current state of the art, the unthreaded portion is located around the entire perimeter of the implant, so that for its installation it is sufficient to...). (The operator simply slides this section through the hole already formed in the bone). The external shape of the zygomatic implant 10 presented here ensures that it remains aligned with the axial installation axis throughout the procedure, therefore preventing the possibility of unwanted misalignments - which facilitates the operation, in addition to guaranteeing perfect positioning for the placement of the planned prosthesis.

[0065] Upon completion of the installation – that is, after the apical end of implant 10 has been fixed to the zygomatic bone and its entire body has been inserted into the patient's maxilla until platform 16 faces the alveolar ridge – the operator must position the implant with the smooth longitudinal band 112 facing the buccal side. This is done by jointly visualizing the position of implant 10 with the position of the visual marker on the installation key – that is, the implant 10 is screwed in a little further clockwise or counterclockwise until the appropriate marker on the installation key points to the patient's buccal side, thus making the smooth longitudinal band 112 also face the buccal side. Once this process is complete, simply attach the chosen prosthetic component and, subsequently, the prosthesis to finalize the patient's maxillary dental rehabilitation procedure.

[0066] Having described a preferred embodiment, it should be understood that the scope of the present invention encompasses other possible variations, being limited only by the content of the appended claims, including possible equivalents.

Claims

CLAIMS 1. Zygomatic implant with partially interrupted threaded portion, said implant (10) being defined by: - an elongated and cylindrical body (11) provided with a double thread (111); - a conical apical region (12) with a threaded surface (121), wherein said conical apical region (12) comprises at least three helical chambers (13) and a semi-spherical end (14); and - a cervical region defined by a smooth cervical surface (15) whose edge is orthogonally attached to a perimeter and flat platform (16) that delimits the opening of a prosthetic interface provided with at least one internal section with a hexagonal cross-section (18), characterized by the fact that: - the elongated and cylindrical body (11) comprises at least one longitudinal strip (112) with a substantially smooth surface, - wherein the said smooth longitudinal band (112) is located in the cervical portion of the zygomatic implant (10); - wherein the connection between the threads (111) and the smooth longitudinal strip (112) is made by a transition bend (113), and - wherein the smooth longitudinal strip (112) is aligned with one of the flat faces of the inner section with hexagonal cross-section (18) of the implant prosthetic interface (10).

2. Zygomatic implant according to claim 1, characterized in that the smooth longitudinal strip (112) starts at the smooth cervical surface (15), and extends to the median region of the zygomatic implant (10).

3. Zygomatic implant according to claim 1, characterized in that the smooth longitudinal band (112) is extends and surpasses the median region of the zygomatic implant (10).

4. Zygomatic implant according to claim 1, characterized in that the prosthetic interface comprises: a truncated-conical region (17) with a progressively reduced diameter from the platform (16) towards the apex of the implant; a hexagonal region (18); and a cylindrical region provided with a female thread (19).

5. Zygomatic implant according to claim 1, characterized in that the prosthetic interface comprises one of the following interfaces: Morse taper, external hexagon or internal hexagon.

6. Zygomatic implant according to claim 1, characterized in that the surface of the smooth longitudinal strip (1 12) is recessed at a distance (r) from the perimeter of the threads (1 1 1).

7. Zygomatic implant according to claim 1, characterized in that it comprises at least one marker means disposed in the zygomatic implant (10), said marker means indicating the position of the flat face of the internal section with hexagonal cross-section (18) of the prosthetic interface of the implant (10) corresponding to the positioning of the smooth longitudinal strip (1 12).

8. Zygomatic implant according to claim 7, characterized in that the marker medium is located in one of the following locations of the zygomatic implant (10): platform (16), smooth cervical surface (15), or truncated cone region (17) of the prosthetic interface.

9. Zygomatic implant according to claims 7 and 8, characterized in that the marking means comprises at least one of a color marking, an inscription, a raised area or a recess.

10. Zygomatic implant according to claim 1, characterized by the fact that it comprises an angle (oci) of the thread (121) greater than the angle (012) of the core of the apical region (12) of the zygomatic implant (10), while the thread (111) is parallel to the core of the cylindrical body (11) in which it is located.

11. Zygomatic implant according to claim 1, characterized in that the thread (121) of the apical region (12) comprises substantially trapezoidal geometry having some threads with tapered crest, and the thread (111) of the cylindrical body (11) comprises trapezoidal geometry.

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