Dental implant-prosthetic abutment assembly and method for manufacturing the assembly

Abstract

The present invention relates to a dental implant-prosthetic abutment assembly and a method for manufacturing the assembly, allowing the elimination of microleakage and bacterial penetration between the different parts of the assembly, thus achieving a seal and protection against the proliferation of peri-implant infections.

Description

[0001] DENTAL IMPLANT-PROSTHETIC ABUTMENT ASSEMBLY AND METHOD OF MANUFACTURING THE ASSEMBLY DESCRIPTION OBJECT OF THE INVENTION

[0002] The object of the present invention is a dental implant-prosthetic abutment assembly and a method of manufacturing the assembly.

[0003] The dental implant-prosthetic abutment assembly and the manufacturing method of the assembly prevent micro-leakage and bacterial penetration between the different parts of the assembly, thus achieving a seal and protection against the proliferation of peri-implant infections.

[0004] BACKGROUND OF THE INVENTION

[0005] Dental implants typically have a long-term success rate of around 95%, making them a popular alternative to traditional fixed or removable prostheses. However, as the duration of implant use increases, peri-implantitis has become a significant problem for patients, leading to implant failure with a prevalence ranging from 1% to 47%. Consequently, preventing and effectively treating peri-implantitis is crucial to ensuring patients' quality of life and overall health.

[0006] Most people with periodontitis respond well to treatment, maintaining stable periodontal tissues in the long term. However, in some cases, conditions such as bone loss, pus formation, and bleeding can progress rapidly. The reasons for these variations are not fully understood. Furthermore, peri-implantitis progresses more rapidly than periodontitis in animal models. Several studies have found a common microbiota associated with this condition. Research using PCR-amplified 16S rRNA pyrosequencing, which produces thousands of sequences from individual samples, allows for comprehensive analysis of taxonomically distinct communities, revealing that the peri-implantitis-specific microbial diversity stems from an imbalance in healthy oral communities.

[0007] In addition to being associated with periodontitis and peri-implantitis, these bacteria are linked to the worsening of other systemic diseases, such as diabetes mellitus, liver disease, Alzheimer's disease, and intestinal cancer metastasis, among others. Therefore, maintaining the health of peri-implant tissues is vital not only for implant success but also for the overall health of patients.

[0008] Many biological factors (genetics, immunology, allergies, risk factors, oral microbiome, etc.), social factors (smoking, poor oral hygiene, eating habits, etc.), and mechanical factors (implant surface, type, screw, material, torque, etc.) influence the development of peri-implantitis. Regarding these latter factors, all internally connected implants have a hole connecting the abutment and the implant, making them potential breeding grounds for bacteria. Therefore, the implant-abutment connection and the micro-space between the two are crucial for preventing bacteria from entering this hole.

[0009] The micro-space is defined as the microscopic gap between the implant-abutment interfaces. Some authors state that a precise fit between the implant and abutment is not possible due to precision limitations during the manufacturing process. Abutment connection types include internal hex, external hex, tapered, and platform switch. Butt joint connections offer less sealing efficiency than tapered connections. Therefore, the degree of fit between the implant and abutment interfaces depends primarily on the taper and the connection area. Most connections require a preloaded screw to achieve a close fit with the implant-abutment interface.

[0010] Considering two-piece implant arrangements, the microgap between the two components ranges from 0.1 µm to 10 µm before load application. This can increase after cyclic loading. The size of most oral bacterial flora is in the 0.2–10 µm range. This creates an entry point for bacterial products and endotoxins, allowing them to freely pass through and enter the implant's internal surface and the peri-implant area. The resulting reaction, i.e., inflammation, has been confirmed by neutrophil infiltration near the implant-abutment interface, regardless of the implant's position. Microleakage and bacterial penetration can vary in different implant systems. This difference could be due to varying degrees of taper and connection areas.

[0011] The dental implant and the method of manufacturing a dental implant of the present invention overcome all the previous drawbacks.

[0012] DESCRIPTION OF THE INVENTION

[0013] The object of the present invention is a dental implant-prosthetic abutment assembly that prevents microleakage and bacterial penetration between the different parts of the assembly, thus achieving a seal and protection against the proliferation of pre-implant infections.

[0014] The dental implant-prosthetic abutment assembly comprises a first piece attachable, in use, to the patient and a second piece attachable, in use, to the first piece, wherein the first piece comprises a first contact surface and wherein the second piece comprises a second contact surface, wherein the second contact surface is configured to, in use, at least partially, come into contact with the first contact surface.

[0015] Optionally, where the first piece is a dental implant and the second piece is a prosthetic abutment.

[0016] The first and second contact surfaces have a surface finish with a roughness of less than 0.6 µm, preferably less than 0.4 µm. This minimizes irregularities that would prevent proper sealing. Equivalently, the first and second contact surfaces have a surface finish of class N5 or better.

[0017] Preferably, the first contact surface and the second contact surface are essentially frustoconical surfaces. Preferably, the first frustoconical contact surface has a first generatrix and the first part comprises a first axis of revolution, and the second frustoconical contact surface comprises a second generatrix and the second part comprises a second axis of revolution, wherein the difference between twice the angle formed by the second generatrix and the second axis, and twice the angle formed by the first generatrix and the first axis, is less than 1.25 e , preferably less than 1.08 e In this way, a good seal is achieved due to the parallelism established between the first truncated conical surface and the second truncated conical contact surface.

[0018] Optionally, the assembly, in use, comprises a relationship between the surface application moment of a force on the second truncated conical surface, M sup .f, and the resisting moment in the connection zone between the first truncated conical surface and the second truncated conical surface, M res , which follows the following equation:

[0019]

[0020] where “A” is the major diameter of the truncated cone generated by the second truncated conical surface, “B” is twice the angle formed by the second generatrix and the second axis, and “C” is the height of the truncated cone generated by the second truncated conical surface, and

[0021] where “a” is the major diameter of the truncated cone generated by the first truncated conical surface, and “c” is the height of the truncated cone generated by the first truncated conical surface,

[0022] and where a is between 5.96 and 6.86, preferably between 6.06 and 6.76.

[0023] Optionally, the second component includes a preload factor greater than 18 Ncm, preferably greater than or equal to 20 Ncm. This ensures that all stress application regions are under compression even during occlusal loading when the dental implant-abutment assembly is in use.

[0024] In this way, the configured assembly achieves an efficient seal and therefore protection against the proliferation of peri-implant infections. Since it is a rigid joint without the possibility of using elastic elements, such as elastomeric gaskets or elastic polymeric or plastic materials that would simplify the sealing, the defined assembly achieves a watertight seal at the connection under load.

[0025] The invention also relates to a method of manufacturing the dental implant-prosthetic abutment assembly described above, wherein the method comprises the manufacturing stages of the first piece and the second piece according to the parameters described for said assembly.

[0026] DESCRIPTION OF THE DRAWINGS

[0027] To complement the description being made and in order to help a better understanding of the characteristics of the invention, according to various preferred examples of its practical embodiment, a set of drawings is included as an integral part of said description, in which, for illustrative and non-limiting purposes, the following has been represented:

[0028] Figure 1.- Shows an elevation view of the dental implant-prosthetic abutment assembly of the present invention.

[0029] Figure 2.- Shows a sectional view AA of Figure 1.

[0030] Figure 3.- Shows a cross-sectional view of the first piece along with detail A.

[0031] Figure 4.- Shows a cross-sectional view of the first piece along with a detail B.

[0032] PREFERRED EMBODIMENT OF THE INVENTION

[0033] Figure 1 shows an elevation view of the dental implant-prosthetic abutment assembly of the present invention.

[0034] In section AA of Figure 2, it can be seen that the dental implant-prosthetic abutment assembly of the present invention comprises a first piece (1) attachable, in use, to the patient and a second piece (2) attachable, in use, to the first piece (1), wherein the first piece (1) comprises a first contact surface (3) and wherein the second piece (2) comprises a second contact surface (4), wherein the second contact surface (4) is configured, in use, at least partially, to come into contact with the first contact surface (3), wherein the first piece (1) is a dental implant and the second piece (2) is a prosthetic abutment, where

[0035] - the first contact surface (3) and the second contact surface (4) comprise a surface finish comprising a roughness of less than 0.6 pm or of class N5 or higher, and / or

[0036] - the first contact surface (3) and the second contact surface (4) are essentially frustoconical surfaces, where the frustoconical first contact surface (3) has a first generatrix (G1) and the first piece (1) comprises a first axis of revolution (R1), and the frustoconical second contact surface (4) comprises a second generatrix (G2) and the second piece (2) comprises a second axis of revolution (R2), where the difference between twice the angle formed by the second generatrix (G2) and the second axis (R2), and twice the angle formed by the first generatrix (G1) and the first axis (R1), is less than 1.25 e , I,

[0037] - the assembly, in use, comprises a relationship between the moment of surface application of a force on the second truncated conical surface (4), M sup .f, and the resisting moment in the connection zone between the first truncated conical surface (3) and the second truncated conical surface (4), Mres , which follows the following equation:

[0038] >

[0039]

[0040] where “A” is the major diameter of the truncated cone generated by the second truncated conical surface (4), “B” is twice the angle formed by the second generatrix (G2) and the second axis (R2), and “C” is the height of the truncated cone generated by the second truncated conical surface (4), and

[0041] where “a” is the major diameter of the truncated cone generated by the first truncated conical surface (3), and “c” is the height of the truncated cone generated by the first truncated conical surface (3),

[0042] and where a is between 5.96 and 6.86, and / or

[0043] - the second piece (2) comprises a preload factor greater than or equal to 18Ncm.

[0044] The following tables show the preferred ranges of values ​​for the major diameter (a) of the truncated cone generated by the first truncated conical surface (3), the double (b) of the angle formed by the first generatrix (G1) and the first axis (R1), and the height (c) of the truncated cone generated by the first truncated conical surface (3), as well as the major diameter (a) of the truncated cone generated by the second truncated conical surface (4), the double (B) of the angle formed by the second generatrix (G2) and the second axis (R2), and the height (C) of the truncated cone generated by the second truncated conical surface (4), all for three configurations of dental implant-prosthetic abutment assembly, namely, mini, standard, and maxi.

[0045]

[0046]

Claims

CLAIMS 1. The dental implant-prosthetic abutment assembly of the present invention comprises a first piece (1) attachable to the patient in use and a second piece (2) attachable to the first piece (1) in use, wherein the first piece (1) comprises a first contact surface (3) and wherein the second piece (2) comprises a second contact surface (4), wherein the second contact surface (4) is configured to, in use, at least partially, come into contact with the first contact surface (3), characterized in that: - the first contact surface (3) and the second contact surface (4) comprise a surface finish comprising a roughness of less than 0.6 pm, and / or - the first contact surface (3) and the second contact surface (4) are essentially frustoconical surfaces, where the frustoconical first contact surface (3) has a first generatrix (G1) and the first piece (1) comprises a first axis of revolution (R1), and the frustoconical second contact surface (4) comprises a second generatrix (G2) and the second piece (2) comprises a second axis of revolution (R2), where the difference between twice the angle formed by the second generatrix (G2) and the second axis (R2), and twice the angle formed by the first generatrix (G1) and the first axis (R1), is less than 1.25 e , I, - the assembly, in use, comprises a relationship between the moment of surface application of a force on the second truncated conical surface (4), M sup .f, and the resisting moment in the connection zone between the first truncated conical surface (3) and the second truncated conical surface (4), M res, which follows the following equation: where “A” is the major diameter of the truncated cone generated by the second truncated conical surface (4), “B” is twice the angle formed by the second generatrix (G2) and the second axis (R2), and “C” is the height of the truncated cone generated by the second truncated conical surface (4), and where “a” is the major diameter of the truncated cone generated by the first truncated conical surface (3), and “c” is the height of the truncated cone generated by the first truncated conical surface (3), and where a is between 5.96 and 6.86, and / or The second piece (2) comprises a preload factor greater than 18Ncm.

2. The assembly of claim 1 characterized in that the first piece (1) is a dental implant and the second piece (2) is a prosthetic abutment.

3. The set of any of the preceding claims, characterized in that the first contact surface (3) and the second contact surface (4) comprise a surface finish comprising a roughness of less than 0.4 pm.

4. The assembly of any of the preceding claims, characterized in that the difference between twice the angle formed by the second generatrix (G2) and the second axis (R2), and twice the angle formed by the first generatrix (G1) and the first axis (R1), is less than 1.08 e .

5. The set of any of the preceding claims, characterized in that a is between 6.06 and 6.

76.

6. The assembly of any of the preceding claims, characterized in that the second part (2) comprises a preload factor greater than or equal to 20Ncm.

7. Method of manufacturing the dental implant-prosthetic abutment assembly of any of the claims, wherein the method comprises manufacturing steps of the first piece (1) and the second piece (2) according to the parameters described for said assembly.

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