Sinus implant body

Abstract

The present application relates to a kind of nasal sinus dental implant, comprising: dental implant body, external thread and multiple spiral cut slots, the opposite ends of the dental implant body are respectively set as group end and drill end, and, the position of the drill end of dental implant body is provided with recess to be connected with each spiral cut slot and drill area to surround the periphery of recess, and the spiral direction of external thread and spiral cut slot is not same with each other, wherein, drill area is distinguished into multiple drill segments by multiple spiral cut slots, the opposite sides of each drill segment are distributed in different height positions, so that drill segment has drill low and drill high higher than drill low, thereby, when nasal sinus dental implant is implanted in alveolar cavity and contacts the bottom surface of alveolar cavity, drill end can slowly cut alveolar cavity by drill low, and then can avoid the idle running situation that nasal sinus dental implant only rotates without moving.

Description

Technical Field

[0001] This invention relates to a sinus implant for implantation in the upper jaw, and more particularly to a sinus implant that, when implanted into the bottom surface of the alveolar cavity in the upper jaw, does not spin freely but can slowly cut the bottom surface of the alveolar cavity. Background Technology

[0002] Tooth growth occurs in two stages. In the first stage, baby teeth begin to erupt. In the second stage, baby teeth fall out and are replaced by permanent teeth, which are harder than baby teeth. Once permanent teeth have erupted, no new teeth will grow in. When permanent teeth have serious defects (such as cavities or fractures), the only options are to repair the defective part or extract the entire permanent tooth. Damaged permanent teeth or extraction not only cause aesthetic problems but can also lead to the dislocation of surrounding teeth. Once a tooth is dislocated, it can cause malocclusion, making chewing and speaking increasingly difficult. Nowadays, to avoid tooth dislocation, many patients often seek help from dentists to repair defective teeth.

[0003] With the rapid advancements in dental restoration technology, some patients opt for dental implants to repair defective teeth. The process involves drilling a cavity in the patient's alveolar bone and then inserting the implant into the cavity, with part of the implant positioned inside and the remaining portion protruding outwards to accommodate the artificial crown.

[0004] However, when the upper jaw is relatively thin, dentists currently often use existing sinus implants to insert into the thinner upper jaw. Please refer to [link to relevant documentation]. Figure 1A and Figure 1BAs shown, the existing sinus implant 50 has an implant body 51, an external thread 52, and multiple helical grooves 53. The implant body 51 has a drill end 511 and an assembly end 512 away from the drill end 511. The central region of the drill end 511 is recessed to form a cavity 511a, and the drill end 511 has a drill region 511b surrounding the cavity 511a. The external thread 52 is formed on the implant body 51. On the outer periphery, each helical groove 53 extends from the drilling region 511b and forms an external thread 52, and each helical groove 53 connects to the recess 511a. As shown, the drilling region 511b is divided into multiple annularly spaced drilling sections 511b1 around the recess 511a by multiple helical grooves 53, and each drilling section 511b1 is horizontal, so that the outer periphery of the drilling section 511b1 is at the same horizontal height.

[0005] Please see Figure 1C As shown, when an existing sinus implant 50 is to be implanted into an upper jaw 54, the dentist will first use a drill to drill and cut the upper jaw 54, creating an alveolar bone cavity 541 with a profile smaller than that of the existing sinus implant 50. Next, the dentist will implant the existing sinus implant 50 into the alveolar bone cavity 541. When the drilled end 511 of the existing sinus implant 50 contacts the bottom surface of the alveolar bone cavity 541, each drilled portion of the existing sinus implant 50... Segment 511b1 contacts the bottom surface of alveolar cavity 541 with a surface contact. As a result, when the existing sinus implant 50 rotates relative to the upper jaw 54, because the drilling segment 511b1 is in surface contact with the bottom surface of alveolar cavity 541, the existing sinus implant 50 will often experience a situation where the drilling end 511 cannot cut into alveolar cavity 541 due to the dentist's operating habits. This will cause the existing sinus implant 50 to be unable to stably and continuously cut into alveolar cavity 541.

[0006] However, when the existing sinus implant 50 spins freely, the dentist will inevitably apply more force to the existing sinus implant 50 so that the drill end 511 of the existing sinus implant 50 can cut the bottom surface of the alveolar bone cavity 541. If the dentist applies too much force to the existing sinus implant 50, it will cause the existing sinus implant 50 to easily penetrate the upper jaw 54 and damage the sinus membrane 542. Summary of the Invention

[0007] The main objective of this invention is to provide a sinus implant that improves the structural design of existing sinus implants. When the improved sinus implant is inserted into the alveolar cavity and contacts the bottom surface of the cavity, it can still slowly cut the bottom surface of the cavity. This prevents the implant from excessively cutting the bottom surface of the cavity and damaging the sinus membrane, and also prevents the implant from spinning without moving. As a result, the implant avoids the situation where it fails to cut the bottom surface of the cavity.

[0008] To achieve the aforementioned objective, the present invention provides a sinus implant for implantation into a bone cavity, comprising: an implant body, an external thread, and a plurality of helical grooves.

[0009] The implant body has a drill end and a joint end at opposite ends, and extends from the drill end toward the joint end to form a fitting annular surface. The outer region of the drill end is a drill area that can contact the bottom surface of the alveolar bone cavity, and a recess is formed in the central region to form a cavity surrounded by the drill area.

[0010] The external thread extends along a first helical direction and forms a fitting annular surface on the implant body, and the external thread can fit into the side wall of the alveolar cavity. However, a plurality of helical grooves extend from the drilling area along a second helical direction opposite to the first helical direction and form on the implant body and the external thread. Each helical groove is provided with a notch between it and the cavity, so that each helical groove communicates with the cavity through the notch.

[0011] The drilling area is divided into multiple spaced drilling sections by multiple spiral grooves. The lowest point of each drilling section is designated as a low drilling point, and the height gradually increases from the low drilling point toward the spiral groove to form a high drilling point. A guide surface is formed between the low drilling point and the high drilling point, and a guide space is formed between the low drilling point and the high drilling point to connect the cavity and the spiral groove.

[0012] In a preferred embodiment, the lower part of the drill is adjacent to one of the spiral grooves, while the higher part of the drill is adjacent to the other spiral groove.

[0013] In another preferred embodiment, the implant body is recessed to form a groove at each of the spiral grooves, the groove being adjacent to the drilled low point.

[0014] In another preferred embodiment, the low drilling point is located at the center of the drilling section, and the drilling section gradually increases in height from the low drilling point toward another spiral groove to form an auxiliary drilling high point spaced apart from the high drilling point, such that an auxiliary guide surface is formed between the low drilling point and the auxiliary drilling high point, and the high drilling point and the auxiliary drilling high point are respectively adjacent to one of the spiral grooves.

[0015] In the first three embodiments, the guide surface is inclined from the lower drilling point toward the higher drilling point, wherein the inclination of the guide surface is between 1 and 10 degrees, and the inclination of the guide surface is less than the inclination of the external thread.

[0016] Furthermore, the recesses are spaced apart from each other by the drilling area on the external thread, such that both the low point and the high point of the drilling are located between the recesses and the external thread. The height of the drilling area is lower than the lowest point of the external thread, so that the external thread cannot contact the bottom surface of the groove hole. However, the extension direction of the low point of the drilling extends from the center of the recess outward to the periphery of the drilling area, while the extension direction of the high point of the drilling is tangent to the opening of the recess.

[0017] In addition, the entire external thread is formed only in a local section of the mating toroidal surface, such that a part of the implant body is set as a first implant segment with the external thread, and the remaining section of the implant body is set as a second implant segment without the external thread, and the cavity is formed in the second implant segment.

[0018] Furthermore, the spiral groove is provided with a first groove section and a second groove section. The first groove section is formed only on the external thread, while the second spiral groove is formed on both the implant body and the external thread. Each of the drilling sections is provided with the drilling high point, the guide surface and the drilling low point in sequence along the first spiral direction.

[0019] Finally, the lower part of the drill bit is provided with a straight cutting edge that can cut the groove bone hole, while the outermost periphery of the spiral groove is provided with a spiral cutting edge that can cut the groove bone hole, and the shape of the straight cutting edge is different from that of the spiral cutting edge.

[0020] The present invention is characterized by the sinus implant having multiple drilling sections at the drilling end. Each drilling section gradually decreases in height from one spiral groove to another, so that the low and high points of each drilling section are distributed at different heights. In this way, when the sinus implant is inserted into the alveolar cavity and contacts the bottom surface of the alveolar cavity, the low point of the sinus implant will contact the bottom surface of the alveolar cavity first. This allows the drilling end of the sinus implant to contact the bottom surface of the alveolar cavity in a line contact manner. Thus, the drilling end of the sinus implant can still slowly cut the bottom surface of the alveolar cavity through the low point of the drilling. This prevents the sinus implant from excessively cutting the bottom surface of the alveolar cavity and damaging the sinus membrane, and prevents the sinus implant from spinning without moving. In this way, the sinus implant can avoid the situation where it does not cut the bottom surface of the alveolar cavity. Attached Figure Description

[0021] Figure 1A A three-dimensional view of an existing sinus implant;

[0022] Figure 1B This is a side view of an existing sinus implant;

[0023] Figure 1C This is a schematic diagram of an existing sinus implant being placed in the upper jaw.

[0024] Figure 2 This is a schematic diagram of the separation of the nasal sinus implant from the alveolar bone cavity according to the present invention;

[0025] Figure 3 This is a perspective view of the sinus implant of the present invention in a first preferred embodiment;

[0026] Figure 4 This is a side view of the sinus implant of the present invention in a first preferred embodiment;

[0027] Figure 5 This is a partial sectional view of the sinus implant of the present invention in a first preferred embodiment;

[0028] Figure 6 This is a schematic diagram showing the process of spiral grooving from coarse thread to fine thread.

[0029] Figure 7 A schematic diagram showing multiple drilled sections surrounding a concave cavity;

[0030] Figure 8 A schematic diagram showing the guide surface in an inclined state;

[0031] Figure 9A A schematic diagram showing how a nasal implant can make contact with the bottom of the alveolar cavity via a line contact method;

[0032] Figure 9B This is a schematic diagram showing bone fragments located between the dental implant and the sinus membrane.

[0033] Figure 10 This is a side view of the sinus implant in the second preferred embodiment of the present invention;

[0034] Figure 11 and Figure 12 This is a side view of the sinus implant in the third preferred embodiment of the present invention;

[0035] Figure 13 A side view of a sinus implant in a fourth preferred embodiment of the present invention.

[0036] Figure labeling: 1-Sinus implant; 10-Implant body; 10a-First implant segment; 10b-Second implant segment; 11-First implant post; 12-Second implant post; 13-Assembly end; 14-Drilling end; 141-Cavity; 141a-Cavity opening; 142-Drilling area; 142a-Drilling segment; 142b-Guiding space; 142c-Drilling low point; 142c-Straight cutting edge; 142d-Drilling high point; 142e-Guiding surface; 142f-Auxiliary guiding space; 142g-Auxiliary drilling high point; 142h-Auxiliary guiding surface; 15-Matching torus; 151-First mating torus; 152-Second mating torus; 16-Turn; 17-Notch; 18 - Groove; 20 - External thread; 21 - Fine thread; 22 - Coarse thread; 30 - Helical groove; 31 - Groove entrance; 32 - First groove section; 33 - Second groove section; 34 - Helical cutting edge; 40 - Upper jawbone; 41 - Alveolar bone cavity; 411 - Alveolar bone opening; 412 - Bottom surface; 413 - Side wall surface; 42 - Sinus membrane; 43 - Bone fragment; D1 - First helical direction; D2 - Second helical direction; 50 - Existing sinus implant; 51 - Implant body; 511 - Drill end; 511a - Concave cavity; 511b - Drilling area; 511b1 - Drilling section; 512 - Assembly end; 52 - External thread; 53 - Helical groove; 54 - Upper jawbone; 541 - Alveolar bone cavity; 542 - Sinus membrane. Detailed Implementation

[0037] The present invention will be further described below with reference to specific embodiments and accompanying drawings, and the advantages and features of the present invention will become clearer with the description.

[0038] Please see Figure 2As shown, the sinus implant 1 of the present invention is used to be implanted into an alveolar bone cavity 41 of an upper jaw 40, so that the sinus implant 1 can be implanted into the sinus of the human body, and then the sinus implant 1 can be pushed against a sinus membrane 42. As shown, the alveolar bone cavity 41 has an alveolar bone opening 411 disposed on the surface of the upper jaw 40, and the alveolar bone cavity 41 has a bottom surface 412 spaced apart from the alveolar bone opening 411 at one end away from the alveolar bone opening 411 and arranged on the sinus membrane 42. The alveolar bone cavity 41 has a side wall 413 between the alveolar bone opening 411 and the bottom surface 412.

[0039] Please see Figure 3 and Figure 4 As shown, in the first preferred embodiment, the sinus implant 1 mainly consists of an implant body 10, an external thread 20, and multiple helical grooves 30. The implant body 10 is used to assemble an artificial crown (not shown). The implant body 10 has a first implant post 11 with a cylindrical appearance and a second implant post 12 extending outward from the first implant post 11. The first implant post 11 has an assembly end 13 at its end away from the second implant post 12, which can be assembled to the artificial crown. The second implant post 12 has an assembly end 13 at its end away from the assembly end 13. A drill end 14 is provided to contact the bottom surface 412 of the alveolar cavity 41. The outer periphery of the implant body 10 is provided with a fitting annular surface 15 extending from the drill end 14 toward the assembly end 13. The fitting annular surface 15 can contact the side wall surface 413 of the alveolar cavity 41. As shown in the figure, a partial area of ​​the fitting annular surface 15 is formed around the outer periphery of the first implant post 11 to form a first fitting annular surface 151, and the remaining area of ​​the fitting annular surface 15 is formed around the outer periphery of the second implant post 12 to form a second fitting annular surface 152 adjacent to the first fitting annular surface 151.

[0040] In addition, the implant body 10 has a recessed cavity 141 in the central region of the drill end 14, and the remaining region of the drill end 14 is set as a drill region 142. The cavity 141 has a cavity opening 141a surrounded by the drill region 142, and the drill region 142 is used to contact the bottom surface 412 of the alveolar bone cavity 41. As shown in the figure, the implant body 10 has a turning point 16 between the fitting annular surface 15 of the implant body 10 and the drill region 142. The turning point 16 is used to allow the fitting annular surface 15 and the drill region 142 to be distributed on the outer peripheral side surface and the bottom side surface of the implant body 10, so that the fitting annular surface 15 and the drill region 142 are distributed on different sides of the implant body 10 through the turning point 16.

[0041] Please see Figure 4 and Figure 5As shown, the external thread 20 of the sinus implant extends along a first helical direction D1 and forms on the fitting annular surface 15 of the implant body 10, so that the external thread 20 can be helically fitted into the side wall surface 413 of the alveolar bone cavity 41, as shown. Figure 4 As shown, the first mating annular surface 151 of the first implant post 11 is provided with a fine thread 21, while the second mating annular surface 152 of the second implant post 12 is provided with a coarse thread 22. The fine thread 21 is close to the assembly end 13 of the implant body 10, while the coarse thread 22 is close to the drilling end 14 of the implant body 10. The pitch of the fine thread 21 is smaller than the pitch of the coarse thread 22. The fine thread 21 and the coarse thread 22 together form the external thread 20. In this embodiment, because the turning point 16 is used to allow the mating annular surface 15 and the drilling area 142 to be distributed on different sides of the implant body 10, the external thread 20 can only be formed on the mating annular surface 15 and cannot be formed on the drilling area 142 of the drilling end 14. The cavity 141 of the implant body 10 is arranged at intervals on the external thread 20 through the drilling area 142 of the drilling end 14, and the height of the drilling area 142 is lower than the lowest point of the external thread 20.

[0042] like Figure 4 and Figure 5 As shown, multiple spiral grooves 30 are arranged in annularly at equal intervals on the fitting annular surface 15 of the implant body 10. Each spiral groove 30 extends from the drill end 14 of the implant body 10 along a second spiral direction D2 opposite to the first spiral direction D1, forming a groove entrance 31 in the drill region 142 of the drill end 14. Each spiral groove 30 has a notch 17 adjacent to the groove entrance 31 between it and the cavity 141, so that each spiral groove 30 is connected to the cavity 141 through the notch 17. In this embodiment, each spiral groove 30 has a first groove segment. 32 and a second cutting section 33 adjacent to the first cutting section 32. The first cutting section 32 is close to the assembly end 13 of the implant body 10, and the first cutting section 32 is formed only on a portion of the coarse thread 22 of the external thread 20. The second cutting section 33 is close to the drill end 14 of the implant body 10, and the second cutting section 33 has a cutting inlet 31. The second cutting section 33 is formed on both the second implant post 12 of the implant body 10 and the remaining coarse thread 22 of the external thread 20, so that the helical groove 30 is not formed on the fine thread 21 located around the first implant post 11. However, the fact that the helical groove 30 is not formed on the fine thread 21 is only for illustrative purposes, that is, as... Figure 6As shown, when the spiral groove 30 extends to the entire length of the coarse thread 22, a local section of the spiral groove 30 can extend to the local length of the fine thread 21, so that the remaining length of the fine thread 21 does not form the spiral groove 30. In addition, the outermost periphery of the spiral groove 30 is provided with a spiral cutting edge 34 in the same spiral shape to cut on the side wall surface 413 of the groove hole 41.

[0043] Please see Figure 7 and Figure 8 As shown, the drilling area 142 of the drilling end 14 is divided into multiple drilling sections 142a by the slot inlets 31 of multiple helical grooves 30. The multiple drilling sections 142a are arranged in a ring-shaped interval along the periphery of the recess opening 141a, such that there is a slot inlet 31 between every two drilling sections 142a. As shown, each drilling section 142a gradually decreases in height from one helical groove 30 along the periphery of the recess opening 141a to another helical groove 30, so that each drilling section 142a forms a guide provided around the recess opening 141a. Guide space 142b, and each drilling segment 142a is distributed at different height positions on opposite sides of guide space 142b, such that each drilling segment 142a has a lower drilling low point 142c and a higher drilling high point 142d, and the drilling low point 142c is adjacent to one of the spiral grooves 30, and the drilling high point 142d is adjacent to the other spiral groove 30. Each guide space 142b connects the cavity 141 of the implant body 10 and the spiral groove 30, and each guide space A guide surface 142e is provided between the lower drilling point 142c and the higher drilling point 142d in section 142b. The guide surface 142e extends obliquely from the lower drilling point 142c toward the higher drilling point 142d, thus presenting an oblique shape. In this way, each drilling section 142a is sequentially arranged along the first helical direction D1, first with the higher drilling point 142d, then with the guide surface 142e, and finally with the lower drilling point 142c. In this embodiment, the slope of the guide surface 142e is between 1 and 10 degrees, and the slope of the guide surface 142e is less than the slope of the external thread 20. In addition, the lower drilling point 142c is provided with a straight cutting edge 142c1 in the same straight shape to cut the bottom surface 412 of the groove hole 41. The shape of the straight cutting edge 142c1 of the lower drilling point 142c is different from the spiral cutting edge 34 of the spiral groove 30. Furthermore, the straight cutting edge 142c1 of the lower drilling point 142c is not connected to the spiral cutting edge 34 of the spiral groove 30. In addition, the extension direction of the lower drilling point 142c is from the center of the recess 141 to the periphery of the drilling area 142 from the inside out. The extension direction of the higher drilling point 142d is tangent to the recess opening 141a.

[0044] Please see Figure 9A , Figure 9B As shown, when the sinus implant 1 is to be implanted into the upper jaw 40, the dentist will first use a drill to drill and cut the upper jaw 40, forming an alveolar cavity 41. Next, the dentist will rotate the sinus implant 1 to implant it into the alveolar cavity 41. When the sinus implant 1 contacts the bottom surface 412 of the alveolar cavity 41, the drill bit 142c of the sinus implant 1 will first contact the bottom surface 412 of the alveolar cavity 41, allowing the sinus implant 1 to contact the bottom surface 412 of the alveolar cavity 41 in a line contact manner, preventing the external thread 20 from contacting the bottom surface 412 of the alveolar cavity 41. As the sinus implant 1 continues to rotate, the sinus implant 1 can slowly cut the bottom of the alveolar cavity 41 through the straight cutting edge 142c1 of the drill bit 142c. Surface 412, thereby preventing the sinus implant 1 from spinning idly without cutting the upper jaw 40, and also avoiding excessive cutting on the bottom surface 412 of the alveolar cavity 41, which could damage the sinus membrane 42. In this embodiment, during the process of the sinus implant 1 being inserted into the alveolar cavity 41, both the straight cutting edge 142c1 of the drilled low point 142c and the threaded cutting edge of the external thread 20 will cut the upper jaw 40 to form a bone fragment 43. The bone fragment 43 will move along the spiral groove 30 toward the recess 141 of the implant body 10. When the upper jaw 40 located between the bottom surface 412 of the alveolar cavity 41 and the sinus membrane 42 is penetrated by the drilled low point 142c, the sinus implant 1 will gradually push against the sinus membrane 42, so that the bone fragment 43 can be located between the sinus implant 1 and the sinus membrane 42.

[0045] Please see Figure 10 As shown, in the second preferred embodiment, the difference from the first preferred embodiment is that the external thread 20 is located at the position of the implant body 10, while the structural features of the implant body 10, the external thread 20, and the spiral groove 30 are the same as in the first preferred embodiment. Therefore, the structural features of the implant body 10, the external thread 20, and the spiral groove 30 will not be described again in this embodiment. As shown in the figure, the fine thread 21 of the external thread 20 is also formed on the first mating annular surface 151 of the first implant post 11, while the coarse thread 22 of the external thread 20 is formed on a part of the first mating annular surface 151 of the second implant post 12, so that the remaining first mating annular surface 151 of the second implant post 12 does not form the external thread 20. Thus, a part of the implant body 10 is set as a first implant segment 10a with the external thread 20 formed, while the remaining part of the implant body 10 is set as a second implant segment 10b without the external thread 20 formed, and the cavity 141 is formed in the second implant segment 10b.

[0046] Please see Figure 11 and Figure 12As shown, in the third preferred embodiment, the difference from the second preferred embodiment lies in the drilling section 142a of the drilling end 14. As shown, the drilling section 142a further decreases in height from the drilling low point 142c along the recessed opening toward the direction away from the guide space 142b to the helical groove 30, such that each drilling section 142a forms an auxiliary guide space 142f adjacent to the guide space 142b. Furthermore, each drilling section 142a is distributed at different height positions on opposite sides of the auxiliary guide space 142f, such that each drilling section 142a further has a height position higher than the drilling low point 142c. The auxiliary drilling height 142g is located between the drilling height 142d and the auxiliary drilling height 142g of the drilling section 142a. The drilling height 142d and the auxiliary drilling height 142g are adjacent to one of the spiral grooves 30. In addition, the auxiliary guide space 142f is provided with an auxiliary guide surface 142h located between the drilling height 142c and the auxiliary drilling height 142g. The auxiliary guide surface 142h extends obliquely from the drilling height 142c toward the auxiliary drilling height 142g and is inclined. Furthermore, the inclination direction of the auxiliary guide surface 142h is different from that of the guide surface 142e.

[0047] Please see Figure 13 As shown, in the fourth preferred embodiment, the difference from the first preferred embodiment is that the implant body 10 is recessed from the surface of each spiral groove 30 to form a groove 18 for providing the second implant post 12. The outline of the groove 18 is adjacent to the drilling low 142c of the implant body 10 to reduce the cutting edge angle of the straight cutting edge 142c1 of the drilling low 142c, making the straight cutting edge 142c1 of the drilling low 142c sharper. As a result, when the sinus implant 1 contacts the bottom surface 412 of the alveolar bone cavity 41, the drilling low 142c of the sinus implant 1 can more easily cut the bottom surface 412 of the alveolar bone cavity 41.

[0048] The above description is illustrative only and not restrictive to the present invention. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the claims, and all such modifications, variations or equivalents will fall within the protection scope of the present invention.

Claims

1. A sinus implant for insertion into an alveolar bone cavity, comprising: A dental implant body has a drill end and a set of joint ends at opposite ends, and extends from the drill end toward the set of joint ends to form a fitting annular surface. The outer region of the drill end is a drill area that can contact the bottom surface of the alveolar bone cavity, and a recessed cavity surrounded by the drill area is formed in the central region. An external thread, extending along a first helical direction, is formed on the fitting annular surface of the implant body, and the external thread can engage with the sidewall of the alveolar bone cavity; and Multiple helical grooves extend from the drilling area along a second helical direction opposite to the first helical direction to form on the implant body and the external thread. Each helical groove is provided with a notch between it and the cavity, so that each helical groove communicates with the cavity through the notch. Its features are: The drilling area is divided into multiple spaced drilling sections by multiple spiral grooves. The lowest point of each drilling section is designated as a low drilling point, and the height gradually increases from the low drilling point toward the spiral groove to form a high drilling point, such that a guide surface is formed between the low drilling point and the high drilling point, and a guide space is formed between the low drilling point and the high drilling point to connect the cavity and the spiral groove. When the implant body contacts the bottom surface of the alveolar bone cavity, the lowest point of the implant body will contact the bottom surface of the alveolar bone cavity, so that the implant body can contact the bottom surface of the alveolar bone cavity in a line contact manner. The guide surface is inclined from the lower drilling point toward the higher drilling point, and the inclination of the guide surface is less than the inclination of the external thread.

2. The sinus implant according to claim 1, characterized in that, The recesses are spaced apart from each other on the external thread through the drilling area, such that both the low point and the high point of the drilling are located between the recesses and the external thread, and the height of the drilling area is lower than the lowest point of the external thread, so that the external thread cannot contact the bottom surface of the groove hole.

3. The sinus implant according to claim 1, characterized in that, The extension direction of the drilling at the lower part extends from the center of the recess outward to the periphery of the drilling area, while the extension direction of the drilling at the higher part is tangent to the opening of the recess.

4. The sinus implant according to claim 1, characterized in that, The lower part of the drill is adjacent to one of the spiral grooves, while the higher part of the drill is adjacent to the other spiral groove.

5. The sinus implant according to claim 1, characterized in that, The implant body has a recessed groove at each of the spiral cuts, the groove being adjacent to the drilled low point.

6. The sinus implant according to claim 1, characterized in that, The entire external thread is formed only in a local section of the mating toroidal surface, such that a portion of the implant body is configured as a first implant segment with the external thread, and the remaining portion of the implant body is configured as a second implant segment without the external thread, and the cavity is formed in the second implant segment.

7. The sinus implant according to claim 1, characterized in that, Each of the drilling sections is sequentially provided with the drilling high point, the guide surface, and the drilling low point along the first spiral direction.

8. The sinus implant according to claim 1, characterized in that, The low drilling point is located at the center of the drilling section, and the drilling section gradually increases in height from the low drilling point toward another spiral cutting groove to form an auxiliary drilling high point that is spaced apart from the high drilling point, so that an auxiliary guide surface is formed between the low drilling point and the auxiliary drilling high point, and the high drilling point and the auxiliary drilling high point are respectively adjacent to one of the spiral cutting grooves.

9. The sinus implant according to claim 1, characterized in that, The lower part of the drill bit is provided with a straight cutting edge that can cut the groove bone hole, while the outermost part of the spiral cutting groove is provided with a spiral cutting edge that can cut the groove bone hole, and the shape of the straight cutting edge is different from that of the spiral cutting edge.

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