Absorbable bone pin for dental implant

Abstract

The utility model discloses a kind of absorbable bone nails of dental implant, including the end cap structure of top, the main part of gradually contracting from top to bottom in conical platform shape and being connected below end cap structure, cylindrical extension section is connected in main part bottom, conical end is connected in extension section terminal, the upper bottom diameter of conical platform shape main part is same with end cap structure diameter, the diameter of bottom surface of conical end is same with extension section diameter;Wherein, end cap structure, main part, extension section and end are coaxially arranged, and are made into integrated molding structure using homograft bone;The conical platform shape main part of this product is wide on top and narrow on bottom, consistent with end cap diameter, gradually fits when implanting and bone tissue, contact area gradually increases, main part is fully embedded when end cap bottom is pasted alveolar bone surface, resistance increases suddenly, help doctor accurate depth judgment.End cap, main part coaxial, symmetric regular form, implant along preset axis can prevent inclination, also convenient to observe, improve accuracy.Homograft bone integrated structure, give consideration to physical strength, biocompatibility and absorbability.Can be absorbed by human body, under the premise of guaranteeing supporting effect, also can induce osteoblast to form new bone, realize fusion replacement.Slow absorption in the process of inducing bone, avoid secondary surgery to remove, prevent soft and hard tissue resorption reconstruction caused by secondary surgery.

Description

Technical Field

[0001] This utility model relates to the field of dental implant technology, specifically to an absorbable bone screw for dental implantation. Background Technology

[0002] In current alveolar bone augmentation surgery, the stability of the bone augmentation area is a necessary condition for osteogenesis, as the use of bone screws is crucial. In moderate to severe bone defects, the lack of stable support can lead to a decrease in both the quality and quantity of bone formation. Tent screws can increase the stability of the graft area, but they are usually made of non-absorbable metal, requiring a second surgery for removal, and increasing the risk of exposure during the healing process. Traditional absorbable bone screws typically have a small support area, are difficult to fix, and are prone to breakage due to their weak instrument strength. Meanwhile, three major issues hinder clinical outcomes and patient experience when using bone screws: First, uncontrolled implantation depth. Current screws lack precise positioning structures, relying on doctors' experience to judge implantation depth, which can easily lead to excessively deep screws damaging nerves and blood vessels or insufficiently shallow screws affecting stability due to deviations in force control. Second, high risk of postoperative loosening. The screw surface is mostly a smooth cylinder, lacking sufficient mechanical interlocking ability with alveolar bone tissue. During the postoperative healing period, it is easily loosened due to chewing forces, tissue swelling, and other factors, resulting in poor bone augmentation. Third, the risk of secondary trauma. The use of non-absorbable hard materials such as stainless steel and titanium alloys can easily lead to leakage. Patients with metal allergies should avoid using these screws, and a second surgery is required to remove them, not only prolonging the treatment period but also increasing the risk of further alveolar bone damage and infection. Utility Model Content

[0003] Therefore, this invention provides an absorbable bone screw for dental implantation to solve the above-mentioned problems in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] According to a first aspect of this utility model, a resorbable bone screw for dental implantation.

[0006] This utility model has the following advantages:

[0007] 1. The frustum-shaped main body gradually tapers from top to bottom, with the diameter of the upper base perfectly matching the diameter of the end cap structure, forming a stepped transition shape that is wider at the top and narrower at the bottom. When the bone screw is implanted into the alveolar bone, the frustum-shaped structure of the main body will gradually conform to the bone tissue. As the implantation progresses, the contact area between the main body and the bone wall gradually increases. When the bottom of the end cap structure conforms to the surface of the alveolar bone, the main body has been completely embedded in the bone tissue. At this point, the implantation resistance increases significantly, and the doctor can clearly judge by touch whether the preset depth has been reached, without relying on subjective experience, thus avoiding depth loss control.

[0008] 2. The end cap structure, main body, extension, and end cap are coaxially arranged, giving the bone screw a symmetrical and regular shape. During implantation, the dentist only needs to advance the screw along the preset axis using conventional dental implant tools (such as a bone screw driver) to ensure that the bone screw is always implanted perpendicular to the alveolar bone surface, avoiding tilted implantation caused by structural eccentricity (tilted implantation easily causes uneven force on the bone screw, accelerating loosening). At the same time, the coaxial structure also makes it easier for the dentist to observe the position of the bone screw through endoscopy or X-ray, further improving the accuracy of implantation.

[0009] 3. The integrated structure made of allogeneic bone has better biocompatibility and osteoconductivity compared to traditional metal materials or synthetic absorbable materials. The composition of allogeneic bone is highly consistent with human bone tissue. After implantation, it can be recognized by human bone cells and gradually integrated into bone cells. Bone cells can adhere to and proliferate on the surface and internal pores of the bone nail, gradually forming new bone tissue, realizing the integrated fusion of "bone nail-autologous bone", and ultimately achieving complete absorbable replacement.

[0010] 4. Existing metal bone screws are non-absorbable and require a second surgery for removal, which can easily cause further damage to the alveolar bone and increase the risk of infection. This bone screw utilizes the absorbable properties of allogeneic bone, naturally degrading without the need for a second surgery. During the bone healing process, the allogeneic bone is gradually absorbed and degraded by osteoclasts and replaced by newly formed autologous bone tissue. After healing, the bone screw completely integrates into the body's own bone tissue, eliminating the need for a second surgery like metal bone screws. This completely avoids the pain, infection risks, and prolonged treatment period caused by secondary trauma. Attached Figure Description

[0011] 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.

[0012] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0013] Figure 1 A front view of an absorbable bone screw for dental implantation provided for some embodiments of this utility model.

[0014] Figure 2 A top view of an absorbable bone screw for dental implantation provided for some embodiments of this utility model.

[0015] Figure 3 A cross-sectional view of an absorbable bone screw for dental implantation provided for some embodiments of this utility model.

[0016] Figure 4 A perspective view of an absorbable bone screw for dental implantation provided for some embodiments of this utility model.

[0017] Figure 5 This is a dimensional scale diagram of an absorbable bone screw for dental implantation, provided for some embodiments of the present invention.

[0018] Figure 6 This is a diagram illustrating the usage state of an absorbable bone screw for dental implantation, provided for some embodiments of this utility model.

[0019] In the diagram: 1. End cap structure; 2. Main body; 3. Extension section; 4. End. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Example 1

[0022] like Figures 1 to 6As shown, this embodiment provides a resorbable bone screw for dental implantation. The specific structure includes a cylindrical end cap structure 1 at the top, a frustum-shaped main body 2 integrally connected below the end cap structure 1, gradually tapering downwards from top to bottom, a cylindrical extension 3 integrally connected to the bottom of the main body 2, and a conical end cap 4 integrally connected to the end of the extension 3. The upper diameter of the frustum-shaped main body 2 is the same as the diameter of the end cap structure 1 (assuming the end cap diameter is 1-6 mm, the upper diameter of the main body is also 1-6 mm, preferably 5 mm), and the bottom diameter of the conical end cap 4 is the same as the diameter of the extension 3 (assuming the extension diameter is 1-3 mm, the bottom diameter of the end cap 4 is also 1-3 mm, preferably 2 mm). The end cap structure 1, main body 2, extension 3, and end cap 4 are coaxially arranged and made from allogeneic bone that has undergone low-temperature freeze-drying and degreasing / decalcification treatment. The integrated structure is achieved through a molding process, avoiding the risk of breakage at the joints. The top of the end cap structure 1 is an arc surface (the height of the arc surface is not limited to a specific value, but is based on the curvature of the conventional alveolar bone surface), which can reduce scratches on the gingival tissue during implantation and reduce the feeling of foreign body after surgery.

[0023] The technical advantages of this embodiment are as follows: The upper part of the frustum-shaped main body 2 is wider than the lower part, which gradually increases the contact area with the bone wall during implantation. When the bottom of the end cap structure 1 is in contact with the alveolar bone surface, the implantation resistance is significantly increased. Doctors can accurately judge the implantation depth by touch, solving the problem of depth loss control. The allogeneic bone material has good biocompatibility. After implantation, it can be recognized by human bone cells. Osteoblasts can adhere to and proliferate on the surface of the bone screw, initially realizing the fusion of "bone screw-autologous bone" and avoiding the risk of allergies to metal materials. The integrated coaxial structure ensures that the implantation is advanced in a vertical direction, avoiding uneven force caused by tilted implantation and reducing the probability of loosening after surgery.

[0024] Example 2

[0025] like Figures 1 to 6 As shown, this embodiment, based on the basic structure of embodiment 1, further defines the height and diameter ratio of each component, making it suitable for alveolar bone augmentation surgeries (such as precision implantation in the anterior teeth region) where high precision in bone screw dimensional requirements are needed. Specific parameters are as follows:

[0026] Height ratio: The height ratio of end cap structure 1, main body 2, extension 3 and end cap 4 is strictly controlled at 101:399:312:88, and the height of each component is set to specific values: end cap structure 1 height 1.01mm, main body 2 height 3.99mm, extension 3 height 3.12mm, end cap 4 height 0.88mm, and the overall height is 9mm (1.01+3.99+3.12+0.88), which is suitable for the alveolar bone thickness of most adults (the alveolar bone thickness in the anterior teeth region is usually 8-12mm).

[0027] Diameter ratio: The diameter ratio of end cap structure 1 and extension section 3 is 5:2. Combined with the height parameter, the diameter of end cap structure 1 is set to 5mm (corresponding to a height of 1.01mm, with a diameter-to-height ratio of approximately 5:1 to ensure end cap stability), and the diameter of extension section 3 is set to 2mm (corresponding to a height of 3.12mm, with a diameter-to-height ratio of approximately 1:1.56, which ensures both implantation depth and avoids breakage due to excessive thinness of the extension section).

[0028] Arc surface parameters: The height of the top arc surface of end cap structure 1 is 0.21mm, and the arc radius matches the end cap diameter (radius 2.5mm), so that the arc surface transitions smoothly and further reduces pressure on the gingival tissue.

[0029] The technical effects of this embodiment are as follows: The precise height and diameter ratio ensures balanced stress distribution among the components of the bone screw—the "wide and short" shape of the end cap structure 1 (5mm diameter, 1.01mm height) disperses the vertical pressure during occlusion, while the "slender" shape of the extension section 3 (2mm diameter, 3.12mm height) penetrates deep into the alveolar bone to form stable support, preventing bone screw breakage caused by local stress concentration; the fixed dimensional parameters facilitate industrial mass production and provide doctors with standardized operating guidelines, reducing surgical errors caused by size mismatch; the 0.21mm high arc surface has a higher degree of fit with the gingival tissue, significantly reducing the patient's foreign body sensation after surgery, and reducing food debris accumulation, thus lowering the risk of infection.

[0030] It should be noted that the specific values ​​can be adjusted according to different people's needs, and the numbers provided in this embodiment are only for auxiliary reference.

[0031] Example 3

[0032] like Figures 1 to 6 As shown, this embodiment, based on the precise dimensions of Embodiment 2, further defines the conical angle between the main body and the end portion, making it suitable for scenarios with low alveolar bone density (such as patients with osteoporosis) or narrow implantation space (such as interdental spaces in the posterior tooth region). Specific parameters are as follows:

[0033] End angle: The angle between the generatrix of the conical end 4 and the axis is strictly controlled at 45 degrees. Combined with the parameter of 0.88mm height of end 4, the radius of the conical base of end 4 can be calculated to be 0.88mm (tan45° = base radius / height, that is, base radius = height × tan45° = 0.88 × 1 = 0.88mm), which is close to the diameter of extension 3 of 2mm (radius 1mm), ensuring a smooth transition between the end and the extension, allowing for rapid penetration of the bone cortex during implantation and reducing compression damage to surrounding bone tissue.

[0034] Angle of the main body: The angle between the generatrix and the axis of the frustum-shaped main body 2 is set to 30 degrees (within the preferred range of 15 to 45 degrees). Combined with the parameters of the main body 2 height of 3.99 mm and the upper base diameter of 5 mm (upper base radius of 2.5 mm), the lower base radius of the main body can be calculated as 2.5 mm - 3.99 mm × tan30° ≈ 2.5 - 3.99 × 0.577 ≈ 2.5 - 2.30 ≈ 0.2 mm. This forms a reasonable transition with the extension segment 3 diameter of 2 mm (radius of 1 mm), which ensures the contact area between the main body and the bone wall, while avoiding a sudden increase in implantation resistance due to an excessively large angle.

[0035] Material reinforcement treatment: During the fabrication of allogeneic bone, a "low-temperature plasma surface activation" process is added to form micro-nano pores (pore size 50-100μm) on the surface of the bone nail, which improves the adhesion efficiency of osteoblasts and is suitable for scenarios with low alveolar bone density.

[0036] The technical advantages of this embodiment are as follows: The 45-degree end angle gives the bone screw "highly efficient penetration," allowing it to penetrate the cortical bone without excessive implantation force, even in cases of low alveolar bone density, thus reducing mechanical damage to bone tissue; the 30-degree main body angle balances the contact area and implantation resistance, ensuring stable locking between the bone screw and the bone wall while avoiding implantation difficulties caused by an angle that is too small (such as 15 degrees); the micro-nano pores of the surface-activated treatment allow osteoblasts to quickly colonize the bone screw surface, accelerating the fusion speed of the "bone screw-autologous bone," shortening the healing period by 1-2 months compared to Embodiment 2, making it suitable for patients with high requirements for healing speed (such as elderly people who need to restore chewing function as soon as possible); the synergistic optimization of angle and size allows the bone screw to adapt to the narrow space of the posterior tooth region, and the 45-degree tip of end 4 can be precisely inserted into the bone tissue of multiple interdental spaces, avoiding damage to the roots of adjacent teeth and broadening the scope of surgical applications.

[0037] It should be noted that the specific values ​​can be adjusted according to different people's needs, and the numbers provided in this embodiment are only for auxiliary reference.

[0038] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

[0039] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

Claims

1. A resorbable bone screw for dental implantation, characterized in that, The device includes a top end cap structure, below which is a main body portion that is shaped like a frustum of a cone and gradually tapers from top to bottom. The bottom of the main body portion is connected to a cylindrical extension segment, and the end of the extension segment is connected to a conical end. The end cap structure, the main body portion, the extension segment, and the end are coaxially arranged and are an integrated molded structure made of the same type of allogeneic bone.

2. The absorbable bone screw for dental implantation according to claim 1, characterized in that, The end cap structure is cylindrical.

3. The absorbable bone screw for dental implantation according to claim 1, characterized in that, The top of the end cap structure is an arc surface.

4. The absorbable bone screw for dental implantation according to claim 1, characterized in that, The top of the end cap structure is flat.

5. The absorbable bone screw for dental implantation according to claim 1, characterized in that, The diameter of the upper base of the truncated cone-shaped main body is the same as the diameter of the end cap structure, and the diameter of the bottom surface of the conical end is the same as the diameter of the extension section.

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