Zygomatic implant
By employing a segmented zygomatic implant design with differentiated threads and smooth connections, the stability and infection issues of implants in patients with maxillary bone defects are resolved, achieving stable fixation and antibacterial effects in different bone environments.
Patent Information
- Application Number
- CN202521964975.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2025-06-19
- Filing Date
- 2025-09-12
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-12
AI Technical Summary
Existing zygomatic implants are not stable enough in patients with maxillary bone defects. The threads are easily exposed, leading to difficulties in cleaning and infection risks. Furthermore, the existing designs are difficult to adapt to the mechanical requirements of different bone environments.
The segmented zygomatic implant design employs threaded structures with different diameters and angles at the zygomatic and maxillary ends, combined with a smooth connection, to provide differentiated mechanical distribution and antibacterial properties, while avoiding thread exposure.
It improves the stability and antibacterial properties of implants, reduces the risk of loosening and displacement, lowers the infection rate, and adapts to the needs of different bone environments.
Smart Images
Figure CN224671635U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of dental implant technology, specifically relating to a zygomatic implant. Background Technology
[0002] Transzygomatic implantation is a dental implant restoration method suitable for patients with severe maxillary bone defects or atrophy. Unlike conventional dental implants, patients with maxillary bone defects have limited bone volume at the zygomatic end, and the implant must only penetrate the double layer of cortical bone at the zygomatic end, with the remainder located in the maxillofacial soft tissue. Existing zygomatic implant designs have several problems, such as: insufficient implant stability; due to limited bone volume, once the implant loosens or breaks, it cannot be re-implanted; and the implant may have exposed threads at the intraoral end, making cleaning difficult and easily leading to peri-implantitis and other oral hygiene problems and related complications.
[0003] Application number WOAU23050950 discloses a zygomatic dental implant with an elongated body, comprising: an elongated apical portion for anchoring the implant in the patient's zygomatic bone, the apical portion having a central longitudinal axis; a coronal portion having an internally threaded hole through which an abutment tooth can engage with the implant; and a middle portion extending between the apical portion and the coronal portion, wherein the cross-sectional shape of the middle portion and / or the coronal portion, taken along a plane perpendicular to the central longitudinal axis, is oval. This patent still has room for improvement.
[0004] Existing zygomatic implants and methods are still significantly inadequate in meeting the needs of patients. There is an urgent need for a zygomatic implant to improve these issues, enhance implantation results, and improve patients' quality of life. Utility Model Content
[0005] To address the problems existing in the prior art, this utility model provides a zygomatic implant that enables the implant to be stably fixed in different bone environments. Especially in the zygomatic bone and maxilla, it can provide differentiated mechanical distribution according to the bone density and mechanical requirements of different locations, effectively solving the problems of implant loosening and displacement.
[0006] To address the aforementioned technical problems, this utility model provides the following technical solution: a zygomatic implant, comprising a zygomatic bone end implant, which is connected to a maxillary bone end implant via a connecting portion. The zygomatic bone end implant has a first threaded portion on its outer side, and the maxillary bone end implant has a second threaded portion on its outer side. This utility model employs a segmented zygomatic implant structure design, with threads at the bone integration sites with the zygomatic bone and maxillary tuberosity, but no threads within the maxillary sinus. This aims to improve implant stability, prevent the implant's threads from being exposed intraorally, and reduce the risk of post-implantation infection. The threaded structure of both the zygomatic bone end implant and the maxillary bone end implant, combined with the smooth surface of the connecting portion, optimizes the implant's stability and antibacterial properties, reducing the incidence of peri-implantitis.
[0007] Specifically, the thread diameter of the first threaded portion is smaller than that of the second threaded portion. The thread designs at the zygomatic and maxillary ends differ to accommodate different bone conditions. Through a segmented structure and differentiated thread dimensions, stable fixation of the implant is achieved in different bone environments, providing precise mechanical distribution, especially in the zygomatic and maxillary bones, improving implant stability and reducing the risk of loosening and displacement. This design has been shown in experiments to significantly reduce implant displacement, particularly in the different density environments of the zygomatic and maxillary bones. By applying different fixation forces according to bone conditions, the probability of postoperative implant loosening is reduced, and the fixation effect is effectively improved.
[0008] Specifically, the first threaded portion has a single tooth groove depth of 0.25mm~0.35mm and a thread inclination angle of 8°~12°; the second threaded portion has a single tooth groove depth of 0.3mm~0.4mm and a thread inclination angle of 8°~12°. The first threaded portion is used to tightly fit with the zygomatic bone during implantation, ensuring stable implantation. Its thread length is 6mm~10mm, preferably 7.5mm, with a preferred single tooth groove depth of 0.3mm. The thread pitch is consistent, and the thread inclination angle can be 10°. The second threaded portion is used for the tight integration of the maxilla and the implant, ensuring the firmness and longevity of the implantation. Its thread length is 8mm~12mm, preferably 10mm, with a preferred single tooth groove depth of 0.35mm. The thread spacing is consistent, and the thread inclination angle can be 10°. A fine anchorage is achieved through the first threaded portion with the high-density zygomatic cortex, while the second threaded portion creates a larger bone contact surface and stronger mechanical retention force in the low-density maxillary bone region, thus forming a gradient stress transfer from cortical bone to cancellous bone throughout the implant-bone interface. The second threaded portion includes a guide section and a main thread section. The guide section has a thread length of 1.5mm to 3mm, with a preferred single tooth depth of 0.3mm, which allows it to contact the bone tissue before the main thread section of the second threaded portion during implantation, providing a smooth implantation transition and reducing initial implantation torque. The tilt angle and varying tooth depths further enhance the stability of the implant.
[0009] Specifically, the connecting part is a rod with a smooth surface. The smooth surface of the connecting part reduces the risk of soft tissue friction and bacterial adhesion, which helps with postoperative oral hygiene maintenance and extends the lifespan of the implant. In clinical practice, peri-implantitis is a common problem leading to implant failure. This invention reduces the infection rate and inflammation incidence through this technical means, improving postoperative recovery for patients.
[0010] Specifically, the connecting part is a rod with a length of 15mm to 30mm. The connecting part is cylindrical, preferably with a diameter of 3.2mm and a length of 16mm to 28mm, specifically 16mm, 19mm, 22mm, 25mm, and 28mm, providing various specifications to adapt to different jawbone structures. It adopts a modular design, which is convenient to operate and highly flexible.
[0011] The zygomatic bone implant end features a guide ball protruding outwards. This guide ball is a smooth hemisphere integrally connected to the first threaded portion. The end is smooth and protrudes 1mm-2mm to reduce micromovement and friction of the implant, ensuring smooth guidance during surgery and avoiding soft tissue damage when exiting the zygomatic bone. The maximum diameter of the guide ball is smaller than the thread root diameter of the first threaded portion, forming a "guide-expansion" implantation path. The guide ball opens the path before the thread, allowing the larger-diameter first threaded portion to follow smoothly with less torque. This design significantly reduces implantation resistance, avoiding the "jamming" phenomenon caused by the small difference between the ball and thread diameters in traditional designs, and reducing compression and micro-damage to the zygomatic bone tissue during surgery.
[0012] The first threaded portion has a first threaded notch, and the second threaded portion has a second threaded notch.
[0013] Specifically, the first threaded notch is elongated, with its length aligned with the axial direction of the first threaded portion, extending through the thread of the first threaded portion. During implantation of the zygomatic bone end implant into the zygomatic bone, the threads may rub against the zygomatic bone, potentially producing small bone fragments. These fragments can be discharged through the first threaded notch, preventing reduced friction at the connection between the zygomatic bone end implant and the zygomatic bone due to these fine bone fragments. Furthermore, because the first threaded notch breaks the thread of the first threaded portion, the number of thread openings increases, making implantation easier during surgery and reducing the time the patient's affected area is exposed to air during the procedure. Compared to partial non-through thread designs, the through thread notch used in this invention offers several technical advantages through its unique structure: This through design creates a highly efficient and continuous chip removal channel during implantation, completely preventing bone chip blockage and the resulting abnormal increase in implantation torque and micro-damage to surrounding bone. In terms of mechanical performance, the notch divides the long thread into multiple independent short thread segments, providing a multi-bladed cutting effect and reducing resistance during implantation. Furthermore, after bone healing, it forms multi-level mechanical locking points distributed along the implant depth, thereby enhancing the implant's resistance to rotation and lateral forces. In addition, on long, continuous threads, stress tends to concentrate on a few threads. The through thread notch interrupts the continuous transmission of stress along the thread, helping to distribute occlusal forces more evenly, improving overall stress distribution, preventing localized bone resorption, and achieving a more stable and long-lasting implant outcome.
[0014] Specifically, the second threaded notch is elongated, with its length aligned with the axial direction of the second threaded portion, and its length less than two-thirds of the thread length of the second threaded portion. During the fixation of the maxilla and implant, bone fragments can be discharged through the second threaded notch, preventing reduced friction at the connection between the implant and the maxilla due to fine bone fragments. To ensure implant stability, the notch location must avoid areas of high stress concentration. In the design, the length of the second threaded notch is less than two-thirds of the thread length of the second threaded portion to prevent the notch from being too long and affecting load distribution, thus impacting torsional and compressive strength. Through the synergistic effect of differentiated thread design and stress-optimized notch, adaptive anchoring and long-term stability of the implant can be achieved in the different bone environments of the zygomatic bone and maxilla.
[0015] The zygomatic bone implant and its connecting portion are detachably connected to the maxillary bone implant.
[0016] This invention provides a segmented zygomatic implant and oral implant to overcome the shortcomings of existing zygomatic implants in terms of stability, cleaning difficulty, and postoperative complications. This invention aims to improve the stability and antibacterial ability of the implant and reduce the incidence of peri-implantitis by improving the implant structure design. Specifically, the zygomatic end features a small-diameter, shallow-tooth, deep-thread design combined with a through-notch, specifically designed for precise anchoring into the high-density zygomatic cortex, providing initial stability and anti-torsional support; while the maxillary end is equipped with a large-diameter, deep-tooth, deep-thread design and a partial notch, designed to increase the contact area with the low-density maxilla, enhancing load-bearing capacity and long-term mechanical locking.
[0017] Compared with the prior art, this utility model has the following obvious technical advantages: (1) The segmented structure optimizes the stability and mechanical distribution of the implant: Through the segmented design of the zygomatic bone end implant, the connecting part and the maxillary bone end implant, the combination of different thread structures and smooth surfaces effectively solves the problems of implant loosening and displacement after surgery. This structural design can achieve stable fixation in different bone environments, especially in the zygomatic bone and maxilla, and can provide differentiated mechanical distribution for different bone density and mechanical needs, reduce micro-movement and displacement of the implant after surgery, and ensure the long-term stability of the implant.
[0018] (2) Optimized thread design enhances implant fixation: This invention employs a differentiated thread design, with the thread diameter at the zygomatic bone end being smaller than that at the maxillary bone end. This design optimizes the fixation force at both ends, providing stronger stability in two different bone structures. The uniformity of the thread spacing ensures a uniform distribution of helical force, and the sufficient tooth depth further enhances the implant fixation, thereby reducing the risk of postoperative implant loosening and displacement. This optimized design can improve the integration strength between the implant and the jawbone based on bone conditions, resulting in better torque and tensile strength resistance of the implant postoperatively.
[0019] (3) Smooth surface design reduces postoperative complications: The smooth surface design of the connecting part and the tail end of the zygomatic bone effectively reduces soft tissue friction and damage, lowers the risk of bacterial adhesion, and thus significantly reduces the incidence of postoperative peri-implantitis. By inhibiting bacterial adhesion and biofilm formation, the implant of this invention can improve postoperative oral hygiene and reduce the chance of implant infection. Especially in clinical practice, peri-implantitis and infection are common problems. The smooth surface treatment of this invention can reduce the occurrence of complications and improve the quality of postoperative recovery.
[0020] (4) Multi-size design adapts to different anatomical structures: The connector design offers multiple sizes to flexibly adapt to the anatomical needs of different patients. This multi-size modular design not only adapts to various zygomatic and maxillary bone structures but also improves surgical flexibility, enabling surgeons to select the most suitable implant length based on the patient's specific anatomical characteristics, thereby ensuring the best surgical outcome. This modular design effectively reduces the risk of postoperative implant displacement and maladaptation. Attached Figure Description
[0021] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the zygomatic implant scheme of this utility model.
[0023] Figure 2 This is a schematic diagram of the zygomatic bone end implant of this utility model.
[0024] Figure 3 This is a schematic diagram of the maxillary bone implant of this utility model.
[0025] Reference numerals: 10-zygomatic bone end implant; 101-first threaded portion; 102-first threaded notch; 103-guide ball head; 20-connection portion; 30-maxillary bone end implant; 301-second threaded portion; 302-second threaded notch. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0027] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.
[0028] Example 1 See Figure 1 A zygomatic implant includes a zygomatic bone end implant 10, which is connected to a maxillary bone end implant 30 via a connecting portion 20. The zygomatic bone end implant 10 has a first threaded portion 101 on its outer side, and the maxillary bone end implant 30 has a second threaded portion 301 on its outer side. Figure 2 and Figure 3 These are schematic diagrams of the zygomatic bone end implant 10 and the maxillary bone end implant 30 of this utility model.
[0029] This invention employs a segmented zygomatic implant design, featuring threads at the bone junctions with the zygomatic bone and maxillary tuberosity, but no threads within the maxillary sinus. This design aims to enhance implant stability, prevent thread exposure at the intraoral end, and reduce the risk of post-implantation infection. The threaded structure of the zygomatic bone implant 10 and the maxillary bone implant 30, combined with the smooth surface of the connecting portion 20, optimizes implant stability and antibacterial properties, reducing the incidence of peri-implantitis.
[0030] Specifically, the thread diameter of the first threaded portion 101 is smaller than that of the second threaded portion 301. The thread designs at the zygomatic bone end and the maxillary bone end are different to adapt to the bone conditions of different locations. Through the segmented structure and differentiated thread dimensions, stable fixation of the implant is achieved in different bone environments, especially in the zygomatic bone and maxilla, providing precise mechanical distribution, which can improve the stability of the implant and reduce the risk of loosening and displacement. This design has been shown in experiments to significantly reduce implant displacement, especially in the different density environments of the zygomatic bone and maxilla. By applying different fixation forces according to the bone conditions, the probability of postoperative implant loosening is reduced, and the fixation effect is effectively improved.
[0031] Specifically, the first threaded portion 101 has a single tooth groove depth of 0.25mm~0.35mm and a thread inclination angle of 8°~12°; the second threaded portion 301 has a single tooth groove depth of 0.3mm~0.4mm and a thread inclination angle of 8°~12°. The first threaded portion 101 is used to tightly fit with the zygomatic bone during implantation to ensure stable implantation. Its thread length is 6mm~10mm, preferably 7.5mm, and its preferred single tooth groove depth is 0.3mm. The thread pitch is consistent, and the thread inclination angle can be 10°. The second threaded portion 301 is used for tight integration between the maxilla and the implant to ensure the firmness and longevity of the implantation. Its thread length is 8mm~12mm, preferably 10mm, and its preferred single tooth groove depth is 0.35mm. The thread spacing is consistent, and the thread inclination angle can be 10°. The second threaded portion 301 has an inlet section and a main thread section. The thread length of the inlet section is 1.5mm to 3mm, and the preferred single tooth groove depth is 0.3mm. This inlet section is used to contact the bone tissue before the main thread section of the second threaded portion 301 during implantation, providing a smooth implantation transition and reducing initial implantation torque. The torque is reduced because at the beginning of implantation, only a small area of the inlet section rubs against the hard cortical bone, rather than the entire threaded portion. Friction is proportional to the contact area; a smaller contact area means lower frictional resistance. Furthermore, the tilt angle and different tooth depth designs can further enhance the stability of the implant.
[0032] Specifically, the connecting portion 20 is a rod with a smooth surface. The smooth surface of the connecting portion 20 reduces the risk of soft tissue friction and bacterial adhesion, thus aiding in postoperative oral hygiene maintenance and extending the lifespan of the implant. In clinical practice, peri-implantitis is a common cause of implant failure. This invention reduces the infection rate and inflammation incidence through this technical means, improving postoperative recovery for patients.
[0033] Specifically, the connecting part 20 is a rod with a length of 15mm to 30mm. The connecting part 20 is cylindrical, preferably with a diameter of 3.2mm and a length of 16mm to 28mm, specifically 16mm, 19mm, 22mm, 25mm, and 28mm, providing various specifications to adapt to different jawbone structures. It adopts a modular design, which is convenient to operate and highly flexible.
[0034] The zygomatic bone implant 10 has a guide ball head 103 protruding outward at its end. The guide ball head 103 is a smooth hemisphere and is integrally connected to the first threaded portion 101. The end is smooth and protrudes 1mm to 2mm to reduce micromovement and friction of the implant, ensuring smooth guidance during surgery and avoiding soft tissue damage when exiting the zygomatic bone. The maximum diameter of the guide ball head is smaller than the thread root diameter of the first threaded portion to form a "guide-expansion" implantation path. The guide ball head 103 opens the path before the thread, and then the larger diameter first threaded portion 101 can follow smoothly with less torque. This design significantly reduces implantation resistance, avoids the "jamming" phenomenon caused by the small difference between the ball head and the thread diameter in traditional designs, and reduces compression and micro-damage to the zygomatic bone tissue during surgery.
[0035] The first threaded portion 101 is provided with a first threaded notch 102, and the second threaded portion 301 is provided with a second threaded notch 302.
[0036] Specifically, the first threaded notch 102 is elongated, with its length direction aligned with the axial direction of the first threaded portion 101, extending through the thread of the first threaded portion 101. When the zygomatic bone implant 10 is inserted into the zygomatic bone, the threads may rub against the zygomatic bone, potentially producing small bone fragments. These fragments can be discharged through the first threaded notch 102, preventing a decrease in friction at the connection between the zygomatic bone implant 10 and the zygomatic bone due to these fine bone fragments. Furthermore, because the first threaded notch 102 breaks the threads of the first threaded portion 101, the number of threaded openings increases, making implantation during surgery easier and reducing the time the patient's affected area is exposed to air during the procedure.
[0037] Specifically, the second threaded notch 302 is elongated, with its length aligned with the axial direction of the second threaded portion 301, and its length less than two-thirds of the thread length of the second threaded portion 301. During the fixation of the maxilla and the implant, bone fragments can be discharged through the second threaded notch 302, preventing reduced friction at the connection between the implant and the maxilla due to fine bone fragments. To ensure implant stability, the notch location must avoid areas of high stress concentration. In the design, the length of the second threaded notch 302 is less than two-thirds of the thread length of the second threaded portion 301 to avoid the notch being too long and affecting load distribution, thus impacting torsional and compressive strength. Through the synergistic effect of differentiated thread design and stress-optimized notch, adaptive anchoring and long-term stability of the implant can be achieved in the different bone environments of the zygomatic bone and maxilla.
[0038] The zygomatic bone implant 10, the connecting part 20, and the maxillary bone implant 30 are detachably connected.
[0039] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the present utility model, and are not intended to limit the implementation methods of the present utility model in any way. Any person skilled in the art may make some modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the present utility model, but these should still be regarded as the same technology or embodiments as the present utility model. This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.
Claims
1. A zygomatic implant, comprising a zygomatic bone end implant (10), characterized in that: The zygomatic bone implant (10) is connected to the maxillary bone implant (30) through the connecting part (20). The zygomatic bone implant (10) has a first threaded part (101) on its outer side and the maxillary bone implant (30) has a second threaded part (301) on its outer side. The thread diameter of the first threaded part (101) is smaller than the thread diameter of the second threaded part (301). The first threaded part (101) has a first threaded notch (102) on its first threaded part (101) and the length of the first threaded notch (102) extends through the thread of the first threaded part (101). The second threaded part (301) has a second threaded notch (302) on its second threaded part (301) and the length of the second threaded notch (302) is less than two-thirds of the thread length of the second threaded part (301).
2. The zygomatic implant according to claim 1, characterized in that: The depth of a single tooth groove in the first threaded part (101) is 0.25mm~0.35mm, and the thread inclination angle is 8°~12°; the depth of a single tooth groove in the second threaded part (301) is 0.3mm~0.4mm, and the thread inclination angle is 8°~12°.
3. A zygomatic implant according to claim 1, characterized in that: The connecting part (20) is a rod with a smooth surface.
4. A zygomatic implant according to claim 3, characterized in that: The length of the connecting part (20) is 15mm~30mm.
5. A zygomatic implant according to claim 1, characterized in that: The zygomatic bone implant (10) has a guide ball head (103) protruding outward at its end. The guide ball head (103) is a smooth hemisphere and is integrally connected with the first threaded part (101) to guide the implantation path.
6. A zygomatic implant according to claim 5, characterized in that: The maximum diameter of the guide ball (103) is smaller than the thread root diameter of the first threaded part (101).
7. A zygomatic implant according to claim 1, characterized in that: The first threaded notch (102) is elongated, and its length direction is the same as the axial direction of the first threaded portion (101).
8. A zygomatic implant according to claim 1, characterized in that: The second threaded notch (302) is elongated, and its length direction is the same as that of the second threaded portion (301).
9. A zygomatic implant according to claim 1, characterized in that: The second threaded portion (301) is provided with an inlet section and a main thread section, wherein the single tooth groove depth of the thread in the inlet section is smaller than the single tooth groove depth of the thread in the main thread section, so as to provide a smooth implantation transition and reduce the initial implantation torque.
10. A zygomatic implant according to claim 1, characterized in that: The zygomatic bone implant (10), the connecting part (20), and the maxillary bone implant (30) are detachably connected.