WO2022099903A1

WO2022099903A1 - Bone screw for repairing alveolar bone defect

Info

Publication number: WO2022099903A1
Application number: PCT/CN2020/141678
Authority: WO
Inventors: 张潇; 张锦阳; 陈贤帅
Original assignee: 佛山市安齿生物科技有限公司
Priority date: 2020-11-12
Filing date: 2020-12-30
Publication date: 2022-05-19
Also published as: CN112353514A

Abstract

A bone screw for repairing an alveolar bone defect, the bone screw comprising a rod portion (100), wherein a thread (200) is arranged on an outer wall of the rod portion (100); the thread (200) is provided with an alveolus (210); the alveolus (210) comprises a bearing tooth side (220), a guide tooth side (230), a first cambered surface (240) and a second cambered surface (250); the bearing tooth side (220), the second cambered surface (250), the first cambered surface (240) and the guide tooth side (230) are sequentially arranged from front to back; there is smooth transition between the rear side of the first cambered surface (240) and the guide tooth side (230); there is smooth transition between the rear side of the second cambered surface (250) and the front side of the first cambered surface (240); there is smooth transition between the front side of the second cambered surface (250) and the bearing tooth side (220); and the circular arc radius of the second cambered surface (250) is smaller than that of the first cambered surface (240). According to the bone screw for repairing the alveolar bone defect, an alveolar bone is further attached to the first cambered surface (240) and the second cambered surface (250), so that the stability of the bone screw after being screwed into the alveolar bone is improved; and the alveolus (210) is formed into a barb structure, so that the alveolus (210) of the thread (200) and the alveolar bone form an occlusion structure, thereby improving the stability of the bone screw after being screwed into the alveolar bone.

Description

Alveolar bone defect repair bone nail

technical field

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

Background technique

Dental implant surgery is a conventional repair method for missing dentition. Dental implant surgery requires drilling an implant cavity in the alveolar bone, and then screwing the implant into the implant cavity to combine the implant with the alveolar bone. However, when the alveolar bone is insufficient, it is difficult for the implant to be firmly combined with the alveolar bone, so bone augmentation repair surgery for the alveolar bone is required. Alveolar bone augmentation repair surgery first fills the alveolar bone defect with autologous bone or artificial bone, and then covers it with dental film to keep the filled grafted bone in the desired shape, while the dental film used for covering needs to be self-tapping. Nail fixation. However, the stability of the existing bone nails after being screwed into the alveolar bone is not high.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an alveolar bone defect repairing bone nail, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or create conditions.

The technical solutions adopted to solve the above technical problems:

An alveolar bone defect repairing bone nail, comprising a rod part, the outer wall of the rod part is provided with a thread, the thread has a tooth groove, and the screw thread's screwing direction is the front direction, and the tooth groove includes a bearing flank, guide flank, first arc surface, second arc surface, the bearing flank, the second arc surface, the first arc surface, and the guide flank are arranged in order from front to back, the The guiding tooth flank faces forward, the bearing tooth flank faces the rear, the rear side of the first arc surface and the guiding tooth flank smoothly transition, the rear side of the second arc surface and the first arc surface There is a smooth transition between the front sides of the second arc surface, and a smooth transition between the front side of the second arc surface and the load flank, and the arc radius of the second arc surface is smaller than the arc radius of the first arc surface.

The beneficial effects of the invention are: when the bone nail is screwed into the alveolar bone, the thread on the outer wall of the bone nail rod is cut into the alveolar bone, and the alveolar and the alveolar bone of the thread are pressed against each other to guide the flank and the first arc. The alveolar bone, the second cambered surface, and the load-bearing flank are all fitted with the alveolar bone. The guiding flank, the first cambered surface, the second cambered surface, and the bearing flank are connected in sequence from the back to the front, and the guiding flank is connected with the first cambered surface. The smooth transition between the second arc surface and the load flank avoids the formation of sharp angles between the first arc surface and the leading flank, and avoids the formation of sharp angles between the second arc surface and the load flank, so that the tooth The alveolar bone fits more closely to the first arc surface and the second arc surface, thereby increasing the contact area between the alveolar and the alveolar bone, thereby improving the stability of the bone screw after screwing into the alveolar bone; the circle of the second arc surface The arc radius is smaller than the arc radius of the first arc surface, so that the tooth alveolus forms a barb structure, so that the tooth alveolar of the thread forms an occlusal structure with the alveolar bone, thereby improving the stability after the bone nail is screwed into the alveolar bone.

The bone debris generated by the thread cutting into the alveolar bone is discharged through the alveolar, and the leading tooth side of the alveolar squeezes the bone debris to flow forward, and the back side of the first arc surface and the leading tooth flank smoothly transition, so that the bone debris flows into the first alveolar more quickly. Between the first arc surface and the second arc surface, the bone debris can be discharged more effectively, and the accumulation of bone debris can be avoided, thereby reducing the resistance of the bone nail being screwed into the alveolar bone and preventing the bone nail from being bent.

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

The diameter of the thread is between 1.4 mm and 1.6 mm, and the diameter of the bone nail is smaller, which can lock the bone nail to a narrower position in the alveolar bone, so that the bone nail can adapt to more installation requirements.

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.

The ratio of the arc radius of the first arc surface to the diameter of the thread is less than two-sevenths, to avoid the excessive difference between the major diameter of the thread and the minor diameter of the thread, which will cause the thread body to be thin and prevent the thread body from breaking; The rear side of the first arc surface and the leading tooth flank smoothly transition, and the ratio of the arc radius of the first arc surface to the diameter of the thread is greater than one-eighth to ensure the distance of the inward concave groove of the thread, so as to make the thread and the thread There is sufficient occlusal space between the alveolar bones.

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.

The ratio of the arc radius of the second arc surface to the diameter of the thread is less than one-seventh, to avoid the excessive difference between the major diameter of the thread and the minor diameter of the thread, which will 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 flank smoothly transition, and the ratio of the arc radius of the second arc surface to the diameter of the thread is greater than one-sixteenth to ensure the distance of the groove of the thread inwardly recessed, so that the thread and There is sufficient occlusal space between the alveolar bones.

As a further improvement of the above technical solution, the included angle between the load flank and the vertical line of the thread axis is the load flank angle, and the size of the load flank angle is between 1° and 6°.

The size of the load flank angle of the load flank is between 1° and 6°, and the load flank angle is small, which improves the occlusal force of the thread to the alveolar bone and helps to improve the stability of the bone nail.

As a further improvement of the above technical solution, the angle between the guide flank and the vertical line of the thread axis is the guide flank angle, and the size of the guide flank angle is between 30° and 40°.

The size of the leading flank angle of the leading flank is between 30° and 40°, and the leading flank angle is larger, which makes the thread cut into the alveolar bone more smoothly, so that the screw can be screwed into the alveolar bone more easily.

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

The bone nail is screwed into the alveolar bone, the alveolar bone and the tooth crest squeeze each other, and the tooth crest of the thread is a plane, so as to avoid the crest fracture caused by the alveolar bone pressing the tooth crest.

As a further improvement of the above technical solution, the alveolar bone defect repair bone nail further includes an end cap, the end cap is disposed at the rear end of the rod portion, and an interface groove is provided on the rear side of the end cap.

The end cap is arranged at the rear end of the rod portion, and the end cap is used to compress the dental membrane and other components, and 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 nail.

As a further improvement of the above technical solution, the alveolar bone defect repair bone nail further comprises a tip, the tip is arranged at the front end of the rod portion, and the shape of the tip is a tapered structure with a small front and a large back. A chip flute is provided on the outer wall of the tip, and the chip flute extends in the front-rear direction.

The front end of the rod is provided with a tip, the tip helps the bone nail to be inserted into the alveolar bone and improves the positioning effect of the bone nail, and the chip removal groove on the outer wall of the tip helps to discharge the bone chips.

Description of drawings

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

1 is a schematic front view of an alveolar bone defect repairing bone nail provided by the present invention, an embodiment thereof;

Figure 2 is a schematic cross-sectional view of A-A in Figure 1;

Figure 3 is an enlarged schematic view of A in Figure 2;

4 is a schematic axonometric view of an embodiment of the alveolar bone defect repairing bone nail provided by the present invention.

100, shank, 200, thread, 210, tooth socket, 220, load flank, 221, load flank angle, 230, guide flank, 231, guide flank angle, 240, first arc, 250, first Two arc surface, 260, tooth crest, 300, end cap, 310, interface groove, 400, tip, 410, chip flute.

Detailed ways

This part will describe the specific embodiments of the present invention in detail, and the preferred embodiments of the present invention are shown in the accompanying drawings. Each technical feature and overall technical solution of the invention should not be construed as limiting the protection scope of the invention.

In the description of the present invention, it should be understood that the azimuth description, such as the azimuth or position relationship indicated by up, down, front, rear, left, right, etc., is based on the azimuth or position relationship shown in the drawings, only In order to facilitate the description of the present invention and simplify the description, it is not indicated or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, if there is a word description such as "several", its meaning is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below , within, etc. are understood to include this number.

In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

1 to 4, the alveolar bone defect repair bone nail of the present invention is made as follows:

The alveolar bone defect repair bone nail includes a rod portion 100 , an end cap 300 and a tip 400 . The end cap 300 is arranged at the rear end of the rod portion 100, and the cross-sectional shape of the end cap 300 is larger than the cross-sectional shape of the rod portion 100, so that the outer edge of the end cap 300 can protrude from the outer wall of the rod portion 100. Screwed into the alveolar bone, the anterior side of the end cap 300 compresses the dental membrane. The rear side of the end cap 300 is provided with an interface groove 310, the opening of the interface groove 310 faces the rear, and the cross-sectional shape of the interface groove 310 can be polygonal, cross groove, straight groove, quincunx groove and so on. The tip 400 is disposed at the front end of the rod portion 100 , the tip 400 has a tapered structure with a small front and a large rear, and 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 flute 410 as described above, and the chip flute 410 extends in the front-rear direction.

A screw thread 200 is provided on the outer wall of the rod portion 100 , and the screw thread 200 is screwed in a forward direction. The thread 200 has tooth sockets 210 and tooth crests 260, and the tooth sockets 210 and the tooth crests 260 are arranged alternately in sequence. The tooth crest 260 is a plane, that is, the contour formed by the tooth crest 260 on the cross section is a straight line. The tooth socket 210 includes a bearing flank 220 , a guide flank 230 , a first arc surface 240 , and a second arc surface 250 . The load flank 220 is opposite to the guide flank 230 , the guide flank 230 faces forward, and the load flank 220 faces rearward. The guide flank 230 , the first arc surface 240 , the second arc surface 250 , and the load flank 220 are arranged in sequence from the back to the front, and there is a smooth transition between the guide flank 230 and the rear side of the first arc surface 240 There is a smooth transition between the front side of the second arc surface 250 and the rear side of the second arc surface 250 , and the smooth transition between the front side of the second arc surface 250 and the bearing flank 220 . The included angle between the load flank 220 and the vertical line of the axis of the thread 200 is the load flank angle 221 , and the size of the load flank angle 221 is between 1° and 6°. The included angle between the leading flank 230 and the vertical line of the axis of the thread 200 is the leading flank angle 231 , and the size of the leading 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. between.

The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the embodiments, and those skilled in the art can also make various equivalent modifications or substitutions without departing from the spirit of the present invention, These equivalent modifications or substitutions are all included within the scope defined by the claims of the present application.

Claims

A bone nail for repairing alveolar bone defect, which is characterized in that it comprises a rod portion (100), the outer wall of the rod portion (100) is provided with a thread (200), and the thread (200) has an alveolar (210) , taking the precession direction of the thread (200) as the front direction, the tooth socket (210) comprises a load flank (220), a guide flank (230), a first arc surface (240), a second arc surface (250), the bearing flank (220), the second arc surface (250), the first arc surface (240), and the guide flank (230) are arranged in sequence from front to back, and the guide The flank (230) faces forward, the bearing flank (220) faces rearward, the rear side of the first arc surface (240) and the guide flank (230) smoothly transition, and the second arc A smooth transition between the rear side of the surface (250) and the front side of the first arc surface (240), and a smooth transition between the front side of the second arc surface (250) and the load flank (220) , the arc radius of the second arc surface (250) is smaller than the arc radius of the first arc surface (240).
The bone nail for repairing alveolar bone defect according to claim 1, wherein the diameter of the thread (200) is between 1.4 mm and 1.6 mm.
The bone nail for repairing alveolar bone defect according to claim 2, wherein the arc radius of the first arc surface (240) is between 0.2 mm and 0.4 mm.
The bone nail for repairing alveolar bone defect according to claim 2, wherein the arc radius of the second arc surface (250) is between 0.1 mm and 0.2 mm.
The bone nail for repairing alveolar bone defect according to claim 1, characterized in that: the included angle between the load flank (220) and the vertical line of the axis of the thread (200) is the load flank angle (221). ), the size of the bearing flank angle (221) is between 1° and 6°.
The bone nail for repairing alveolar bone defect according to claim 1, characterized in that the included angle between the guiding flank (230) and the vertical line of the axis of the thread (200) is the guiding flank angle (231). ), the size of the leading flank angle (231) is between 30° and 40°.
The bone nail for repairing alveolar bone defect according to claim 1, characterized in that: the thread (200) further comprises a tooth crest (260), and the tooth crest (260) and the tooth groove (210) alternate in turn. Provided, the tooth crest (260) is a plane.
The alveolar bone defect repair bone nail according to claim 1, characterized in that: the alveolar bone defect repair bone nail further comprises an end cap (300), and the end cap (300) is arranged on the rod portion ( 100), an interface groove (310) is provided on the rear side of the end cap (300).
The bone nail for repairing alveolar bone defect according to claim 1, characterized in that: the bone nail for repairing alveolar bone defect further comprises a tip (400), and the tip (400) is arranged on the rod portion (100) The shape of the tip (400) is a tapered structure with a small front and a large rear, the outer wall of the tip (400) is provided with a chip removal groove (410), and the chip removal groove (410) is in the front-rear direction. extend.