Bone nails for repairing alveolar bone defects

Abstract

The present invention discloses a bone screw for repairing alveolar bone defects, comprising a rod, a thread is arranged on the outer wall of the rod, the thread has a tooth groove, the tooth groove comprises a load-bearing tooth side, a guide tooth side, a first arc surface, and a second arc surface, the load-bearing tooth side, the second arc surface, the first arc surface, and the guide tooth side are arranged in sequence from front to back, the rear side of the first arc surface and the guide tooth side are smoothly transitioned, the rear side of the second arc surface and the front side of the first arc surface are smoothly transitioned, the front side of the second arc surface and the load-bearing tooth side are smoothly transitioned, and the arc radius of the second arc surface is smaller than the arc radius of the first arc surface. The bone screw for repairing alveolar bone defects of the present invention makes the alveolar bone more closely attached to the first arc surface and the second arc surface, thereby improving the stability of the bone screw after being screwed into the alveolar bone; the tooth groove forms a barb structure, so that the tooth groove of the thread forms an occlusal structure with the alveolar bone, thereby improving the stability of the bone screw after being screwed into the alveolar bone. The present invention can be applied to dental auxiliary appliances.

Description

Technical Field

[0001] The invention relates to the field of dental auxiliary appliances, in particular to a bone nail for repairing alveolar bone defects. Background Art

[0002] Dental implant surgery is a conventional way to repair missing teeth. Dental implant surgery requires drilling an implant hole in the alveolar bone, and then screwing the implant into the implant hole so that the implant can be combined with the alveolar bone. When the alveolar bone volume is insufficient, it is difficult for the implant to be firmly combined with the alveolar bone, so a bone augmentation repair surgery is required for the alveolar bone. The alveolar bone augmentation repair surgery first fills the alveolar bone defect with autologous bone or artificial bone, and then covers it with dental membrane to keep the filled transplanted bone in the desired shape, and the dental membrane used for covering needs to be fixed with self-tapping bone screws. However, the stability of existing bone screws after being screwed into the alveolar bone is not high. Summary of the invention

[0003] The purpose of the present invention is to provide a bone nail for repairing alveolar bone defects to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The technical solutions adopted to solve the above technical problems are:

[0005] A bone nail for repairing alveolar bone defects comprises a rod portion, an outer wall of the rod portion is provided with a thread, the thread has a tooth groove, and with the screwing direction of the thread as the front direction, the tooth groove comprises a load-bearing tooth side, a guide tooth side, a first arc surface, and a second arc surface, the load-bearing tooth side, the second arc surface, the first arc surface, and the guide tooth side are arranged in sequence from front to back, the guide tooth side faces forward, and the load-bearing tooth side faces backward, the rear side of the first arc surface and the guide tooth side are smoothly transitioned, the rear side of the second arc surface and the front side of the first arc surface are smoothly transitioned, the front side of the second arc surface and the load-bearing tooth side are smoothly transitioned, and the arc radius of the second arc surface is smaller than the arc radius of the first arc surface.

[0006] The beneficial effects of the present invention are as follows: when the bone screw is screwed into the alveolar bone, the thread on the outer wall of the bone screw rod cuts into the alveolar bone, the threaded socket and the alveolar bone squeeze each other, the guiding tooth side, the first arc surface, the second arc surface, and the load-bearing tooth side are all fitted with the alveolar bone, the guiding tooth side, the first arc surface, the second arc surface, and the load-bearing tooth side are sequentially connected from back to front, the guiding tooth side and the first arc surface transition smoothly, the second arc surface and the load-bearing tooth side transition smoothly, the formation of a sharp angle between the first arc surface and the guiding tooth side, and the formation of a sharp angle between the second arc surface and the load-bearing tooth side are avoided, so that the alveolar bone is more fitted to the first arc surface and the second arc surface, thereby increasing the contact area between the socket and the alveolar bone, thereby improving the stability of the bone screw after being screwed into the alveolar bone; the arc radius of the second arc surface is smaller than the arc radius of the first arc surface, so that the socket forms a hook structure, so that the threaded socket and the alveolar bone form an occlusal structure, thereby improving the stability of the bone screw after being screwed into the alveolar bone.

[0007] The bone chips generated by the thread cutting into the alveolar bone are discharged through the alveolar socket, and the guiding tooth side of the alveolar socket squeezes the bone chips to flow forward. The rear side of the first arc surface and the guiding tooth side have a smooth transition, so that the bone chips flow into the first arc surface and the second arc surface more quickly, making the bone chips more effectively discharged and avoiding the accumulation of bone chips, thereby reducing the resistance of the bone screw being screwed into the alveolar bone and avoiding the bending of the bone screw.

[0008] As a further improvement of the above technical solution, the diameter of the thread is between 1.4 mm and 1.6 mm.

[0009] The diameter of the thread is between 1.4 mm and 1.6 mm. The smaller diameter of the bone screw can lock the bone screw into a narrower position in the alveolar bone, allowing the bone screw to adapt to more installation requirements.

[0010] As a further improvement of the above technical solution, the arc radius of the first arc surface is between 0.2 mm and 0.4 mm.

[0011] The ratio of the arc radius of the first arc surface to the diameter of the thread is less than two-sevenths, so as to avoid the difference between the major diameter of the thread and the minor diameter of the thread being too large, which may cause the thread body to be thin and prevent the thread body from breaking; the rear side of the first arc surface and the guide tooth side have a smooth transition, and the ratio of the arc radius of the first arc surface to the diameter of the thread is greater than one-eighth, so as to ensure the inward recessed distance of the thread groove, so that there is sufficient occlusal space between the thread and the alveolar bone.

[0012] As a further improvement of the above technical solution, the arc radius of the second arc surface is between 0.1 mm and 0.2 mm.

[0013] The ratio of the arc radius of the second arc surface to the diameter of the thread is less than one-seventh, so as to avoid the difference between the major diameter of the thread and the minor diameter of the thread being too large, which may cause the thread body to be thin and prevent the thread body from breaking; the front side of the second arc surface and the load-bearing tooth side have a smooth transition, and the ratio of the arc radius of the second arc surface to the diameter of the thread is greater than one-sixteenth, so as to ensure the inward recessed distance of the thread groove, so that there is sufficient occlusal space between the thread and the alveolar bone.

[0014] As a further improvement of the above technical solution, the angle between the load flank and the perpendicular line of the thread axis is the load flank angle, and the load flank angle is between 1° and 6°.

[0015] The load-bearing tooth side angle of the load-bearing tooth side is between 1° and 6°. A smaller load-bearing tooth side angle improves the bite force of the thread on the alveolar bone and helps to improve the stability of the bone screw.

[0016] As a further improvement of the above technical solution, the angle between the leading tooth flank and the perpendicular line of the thread axis is the leading tooth flank angle, and the magnitude of the leading tooth flank angle is between 30° and 40°.

[0017] The guide tooth side angle of the guide tooth side is between 30° and 40°. The larger the guide tooth side angle, the smoother the thread cuts into the alveolar bone, making it easier for the bone screw to be screwed into the alveolar bone.

[0018] As a further improvement of the above technical solution, the thread further includes a crest, the crest and the groove are alternately arranged in sequence, and the crest is a plane.

[0019] The bone screw is screwed into the alveolar bone, and the alveolar bone and the tooth crest squeeze each other. The tooth crest of the thread is flat, which prevents the alveolar bone from squeezing the tooth crest and causing the tooth crest to break.

[0020] As a further improvement of the above technical solution, the alveolar bone defect repair bone screw also includes an end cap, which is arranged at the rear end of the rod, and an interface groove is provided on the rear side surface of the end cap.

[0021] The end cap is arranged at the rear end of the rod, and is used to compress the dental membrane and other components. An interface groove is arranged on the rear side of the end cap, and a tool is inserted into the interface groove to facilitate the rotation of the bone screw.

[0022] As a further improvement of the above technical solution, the alveolar bone defect repair bone nail also includes a pointed tip, which is arranged at the front end of the rod, and the shape of the pointed tip is a conical structure that is small in the front and large in the back. A chip groove is provided on the outer wall of the pointed tip, and the chip groove extends in the front-to-back direction.

[0023] The front end of the rod is provided with a tip, which helps the bone screw to be inserted into the alveolar bone and improves the positioning effect of the bone screw. The chip removal groove on the outer wall of the tip helps to discharge bone chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0025] Figure 1 This is a front view schematic diagram of an embodiment of a bone screw for repairing alveolar bone defects provided by the present invention;

[0026] Figure 2 Figure 1 Schematic cross-sectional view of AA in the figure;

[0027] Figure 3 Figure 2 A is an enlarged schematic diagram;

[0028] Figure 4 The figure is an axonometric diagram of an embodiment of a bone screw for repairing alveolar bone defects provided by the present invention.

[0029] 100, rod, 200, thread, 210, tooth groove, 220, load-bearing tooth side, 221, load-bearing tooth side angle, 230, guide tooth side, 231, guide tooth side angle, 240, first arc surface, 250, second arc surface, 260, tooth top, 300, end cap, 310, interface groove, 400, tip, 410, chip groove. DETAILED DESCRIPTION

[0030] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In the description of the present invention, if there are words such as "several", it means one or more, "more than" means more than two, greater than, less than, exceed, etc. are understood as not including the number, and above, below, within, etc. are understood as including the number.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] Reference Figures 1 to 4 The alveolar bone defect repairing bone screw of the present invention is made into the following embodiments:

[0035] The bone screw for repairing alveolar bone defects comprises a rod 100, an end cap 300, and a tip 400. The end cap 300 is arranged at the rear end of the rod 100, and the cross-sectional shape of the end cap 300 is larger than the cross-sectional shape of the rod 100, so that the outer edge of the end cap 300 can protrude from the outer wall of the rod 100. When the bone screw for repairing alveolar bone defects is screwed into the alveolar bone, the front side of the end cap 300 presses the dental membrane. An interface groove 310 is arranged on the rear side of the end cap 300, and the opening of the interface groove 310 faces the rear. The cross-sectional shape of the interface groove 310 can be polygonal, cross-groove-shaped, straight-groove-shaped, plum blossom-shaped, etc. The tip 400 is arranged at the front end of the rod 100, and the tip 400 is a conical structure with a small front and a large rear. The rear end of the tip 400 smoothly transitions with the outer wall of the rod 100. The outer wall of the tip 400 is provided with a chip groove 410, and the chip groove 410 extends in the front-back direction.

[0036] The outer wall of the rod 100 is provided with a thread 200, and the screwing direction of the thread 200 is facing forward. The thread 200 has a groove 210 and a crest 260, and the groove 210 and the crest 260 are arranged alternately in sequence. The crest 260 is a plane, that is, the profile formed by the crest 260 on the cross section is a straight line. The groove 210 includes a load-bearing flank 220, a guide flank 230, a first arc surface 240, and a second arc surface 250. The load-bearing flank 220 is opposite to the guide flank 230, the guide flank 230 faces forward, and the load-bearing flank 220 faces backward. The guide flank 230, the first arc surface 240, the second arc surface 250, and the load flank 220 are arranged in sequence from back to front, and there is a smooth transition between the guide flank 230 and the rear side of the first arc surface 240, a smooth transition between the front side of the first arc surface 240 and the rear side of the second arc surface 250, and a smooth transition between the front side of the second arc surface 250 and the load flank 220. The angle between the load flank 220 and the perpendicular line of the thread 200 axis is the load flank angle 221, and the magnitude of the load flank angle 221 is between 1° and 6°. The angle between the guide flank 230 and the perpendicular line of the thread 200 axis is the guide flank angle 231, and the magnitude of the guide flank angle 231 is between 30° and 40°. The diameter of the thread 200 is between 1.4 mm and 1.6 mm, the arc radius of the first arc surface 240 is between 0.2 mm and 0.4 mm, and the arc radius of the second arc surface 250 is between 0.1 mm and 0.2 mm.

[0037] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A bone screw for repairing alveolar bone defects, characterized in that: The invention comprises a rod portion (100), wherein a thread (200) is provided on an outer wall of the rod portion (100), wherein the thread (200) has a tooth groove (210), and taking the screwing direction of the thread (200) as the front direction, the tooth groove (210) comprises a load-bearing tooth side (220), a guide tooth side (230), a first arc surface (240), and a second arc surface (250), wherein the load-bearing tooth side (220), the second arc surface (250), the first arc surface (240), and the guide tooth side (230) are arranged from front to back. The guide tooth side (230) is arranged in sequence, the guide tooth side (230) faces forward, the load-bearing tooth side (220) faces backward, the rear side of the first arc surface (240) and the guide tooth side (230) have a smooth transition, the rear side of the second arc surface (250) and the front side of the first arc surface (240) have a smooth transition, the front side of the second arc surface (250) and the load-bearing tooth side (220) have a smooth transition, and the arc radius of the second arc surface (250) is smaller than the arc radius of the first arc surface (240); The diameter of the thread (200) is between 1.4 mm and 1.6 mm; The arc radius of the first arc surface (240) is between 0.2 mm and 0.4 mm; The arc radius of the second arc surface (250) is between 0.1 mm and 0.2 mm; The angle between the load-bearing flank (220) and a perpendicular line to the axis of the thread (200) is a load-bearing flank angle (221), and the load-bearing flank angle (221) is between 1° and 6°; The included angle between the leading tooth flank (230) and a perpendicular line to the axis of the thread (200) is the leading tooth flank angle (231), and the magnitude of the leading tooth flank angle (231) is between 30° and 40°.

2. The bone screw for repairing alveolar bone defects according to claim 1, characterized in that: The thread (200) further comprises a crest (260), the crest (260) and the tooth groove (210) are arranged alternately in sequence, and the crest (260) is a plane.

3. The bone nail for repairing alveolar bone defects according to claim 1, characterized in that: The alveolar bone defect repairing bone nail further comprises an end cap (300), the end cap (300) being arranged at the rear end of the rod (100), and an interface groove (310) being arranged on the rear side surface of the end cap (300).

4. The bone screw for repairing alveolar bone defects according to claim 1, characterized in that: The alveolar bone defect repairing bone nail further comprises a tip (400), the tip (400) being arranged at the front end of the rod (100), the tip (400) being shaped like a cone with a smaller front portion and a larger rear portion, and a chip groove (410) being arranged on the outer wall of the tip (400), the chip groove (410) extending in the front-to-back direction.

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