dental implant body

Abstract

This dental implant body comprises a main body part that has a tip end part and a rear end part. The main body part is provided with a tapered first region that includes the tip end part, a third region that is closer to the rear end part than the first region, and a cylindrical second region that is positioned between the first region and the third region; has a male screw part that is disposed along the outer periphery of the first region and the third region; and is provided with a recess that is disposed only on the outer peripheral surface of the male screw part in the second region and the male screw part in the third region. The outer periphery of the third region is circular in a view from the axial direction which passes through the rotational center of the male screw part.

Description

[Technical Field]

[0001] The present disclosure relates to dental implant bodies. [Background technology]

[0002] Dental implant bodies (dental implant fixtures) are known. For example, Patent Document 1 discloses a dental screw-type implant body provided with a cutting edge for self-tapping. The cutting edge is provided at the lower end of the dental screw-type implant body, i.e., at the end that is the deepest position when implanted into the jawbone.

[0003] Furthermore, for example, Patent Document 2 discloses a non-cylindrical implant body characterized by an eccentricity parameter for primary and secondary fixation to the jawbone. The eccentricity parameter is defined as the ratio of the maximum distance from the center of a cross section of the implant volume to the minimum distance from the center to the outline of this cross section. Patent Document 2 discloses a dental implant body having cutting grooves, which are cutting edges, in any one or more of the crown zone, transition zone, and root apex. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2001-321392 [Patent Document 2] Japanese Patent Publication No. 2021-176564 Summary of the Invention

[0005] A dental implant body according to one embodiment of the present disclosure comprises a main body portion having a tip portion and a rear end portion, the main body portion comprising a tapered first region including the tip portion, a third region closer to the rear end portion than the first region, and a cylindrical second region located between the first region and the third region, the main body portion having a male thread portion arranged from the first region to the outer periphery of the third region, and a recess arranged only on the outer periphery of the male thread portion of the second region, or a recess arranged only on the outer periphery of the male thread portion of the second region and the male thread portion of the third region, the outer periphery of the third region being circular when viewed from an axial direction passing through the center of rotation of the male thread portion. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a front view showing a dental implant body according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a right side view of the dental implant body shown in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line II in FIG. [Figure 4] FIG. 2 is a top view of the dental implant body shown in FIG. 1. [Figure 5] FIG. 2 is a diagram showing the dental implant body shown in FIG. 1 implanted in a jawbone. [Figure 6] FIG. 2 is a diagram showing a modified example of the dental implant body shown in FIG. [Figure 7] FIG. 2 is a diagram showing yet another modified example of the dental implant body shown in FIG. [Figure 8] FIG. 8 is a diagram showing a modified example of the dental implant body shown in FIG. 7. [Figure 9] FIG. 10 is a front view showing a dental implant body according to a second embodiment of the present disclosure. [Figure 10] FIG. 10 is a right side view of the dental implant body shown in FIG. 9. [Figure 11] FIG. 10 is a cross-sectional view taken along line IX-IX in FIG. 9. [Figure 12] FIG. 2 is a view illustrating a method for extracting the dental implant body shown in FIG. 1 from the jawbone. [Figure 13]FIG. 1 shows a conventional dental implant body. DETAILED DESCRIPTION OF THE INVENTION

[0007] Dental implants are bioimplants that are implanted into the jawbone to restore lost tooth root function. Therefore, dental implants are designed with special materials, shapes, and surface properties to ensure a strong bond with the jawbone. However, in rare cases, dental implants may need to be removed due to some reason. In such cases, dentists often have difficulty removing the dental implants because they are firmly integrated with the jawbone.

[0008] An object of one aspect of the present disclosure is to provide a dental implant body having a shape that reduces the effort required for removal.

[0009] According to one aspect of the present disclosure, a dental implant body having a shape that reduces the effort required for removal can be provided.

[0010] [Embodiment 1] An embodiment of the present disclosure will be described in detail below with reference to FIGS. 1 to 8. In FIG. 1, the extension direction of the dental implant body 1 is the Z-axis direction, the left-right direction of the dental implant body 1 is the Y-axis direction, and the direction perpendicular to both the Y-axis direction and the Z-axis direction is the X-axis direction. The positive X-axis direction is the back direction. The positive Y-axis direction is the right direction. The positive Z-axis direction is the upward direction. The X-axis, Y-axis, and Z-axis directions defined in FIG. 1 are also applicable to other figures. Furthermore, the term "plane" means a plane at a visible level, and does not require that it be strictly flat. Furthermore, the term "vertical" means that it is vertical at a visible level, and does not require that it be strictly vertical.

[0011] <Dental implant body> Fig. 1 is a front view showing a dental implant body 1 according to a first embodiment of the present disclosure. Fig. 2 is a right side view of the dental implant body 1 shown in Fig. 1. Fig. 5 is a diagram showing a state in which the dental implant body 1 shown in Fig. 1 is implanted in a jawbone 110.

[0012] 1 and 2, the dental implant body 1 includes a main body 2 having a distal end portion 21 and a proximal end portion 22. As shown in Fig. 5, the distal end portion 21 is a portion located on the cancellous bone 113 side of the alveolar bone 111 when the dental implant body 1 is embedded in the jawbone 110. The proximal end portion 22 is a portion located on the cortical bone 112 side of the alveolar bone 111 when the dental implant body 1 is embedded in the jawbone 110, and is located at the boundary between the alveolar bone 111 and the gums 101.

[0013] As shown in FIG. 1 , the main body 2 includes a first region R1, a third region R3, and a second region R2. The first region R1 is a tapered region including the tip end 21. The third region R3 is a region closer to the rear end 22 than the first region R1. In this embodiment, the third region R3 is a cylindrical region of the main body 2 that includes the rear end 22. The third region R3 does not have to include the rear end 22. The third region R3 may be configured so that its diameter increases from the bottom to the top.

[0014] The second region R2 is a cylindrical region located between the first region R1 and the third region R3. As shown in Fig. 5, the first region R1 and the second region R2 are regions in contact with the cancellous bone 113 when the dental implant body 1 is embedded in the jawbone 110. As shown in Fig. 5, the third region R3 is a region in contact with only the cortical bone 112 when the dental implant body 1 is embedded in the jawbone 110. In this embodiment, the third region R3 is in contact with the gums 101 on the rear end portion 22 side.

[0015] As shown in FIGS. 1 and 2 , the main body 2 further has a male thread portion 23. The male thread portion 23 is disposed around the outer periphery of the first region R1 to the third region R3. The male thread portion 23 extends spirally from the rear end portion 22 to the front end portion 21. This allows the dental implant body 1 to be embedded in the alveolar bone 111 while being screwed in by self-tapping. In this embodiment, when the dental implant body 1 is viewed from above, the clockwise direction with respect to an axis S1 passing through the center of rotation of the male thread portion 23 corresponds to the direction for embedding the male thread portion 23, and the counterclockwise direction corresponds to the direction for removing the male thread portion 23. When the dental implant body 1 is viewed from above, the clockwise direction with respect to an axis S1 passing through the center of rotation of the male thread portion 23 may correspond to the direction for removing the male thread portion 23, and the counterclockwise direction may correspond to the direction for embedding the male thread portion 23.

[0016] Fig. 4 is a top view of the dental implant body 1 shown in Fig. 1. As shown in Fig. 4, the outer periphery of the third region R3 (see Fig. 1) is circular when viewed from above. In this embodiment, since the third region R3 is cylindrical, the outer periphery of the third region R3 is also circular when viewed from below (the direction of the axis S1 passing through the rotation center of the male thread portion 23).

[0017] Here, the axis S1 passing through the center of rotation of the male screw portion 23 is an axis that passes through between the distal end portion 21 and the rear end portion 22 of the main body portion 2, as shown in Fig. 1, and means an axis that serves as the rotation axis when the dental implant body 1 is rotated. In other words, the outer periphery of the third region R3 has a rotationally symmetrical shape with respect to the axis S1 that passes through the center of rotation of the male screw portion 23 from the distal end portion 21 side to the rear end portion 22. This makes it possible to easily remove the dental implant body 1 that is firmly fixed to the jawbone 110.

[0018] As shown in FIG. 4 , the dental implant body 1 has a mark 25 at the rear end 22 of the main body 2, which indicates the position of a recess 24 (described later) on the outer peripheral surface 230. After the dental implant body 1 is embedded in the jawbone 110, the recess 24 cannot be recognized, and the position of the recess 24 cannot be known from outside the jawbone 110. By having the mark 25 on the dental implant body 1, the position of the recess 24 can be recognized from outside even after embedding in the jawbone 110, which facilitates the process of removing the recess 24 from the jawbone 110. In this embodiment, the mark 25 indicates the width of the recess 24 in the XY plane and is displayed at the rear end 22 of the main body 2 along the outer peripheral surface 230. The mark 25 is not limited to this as long as it indicates the position of the recess 24 on the outer peripheral surface 230. In other words, the mark 25 may indicate a part of the position of the recess 24 on the outer peripheral surface 230.

[0019] <recess> 3 is a cross-sectional view taken along line II in FIG. 1. As shown in FIG. 3, the main body 2 includes a recess 24. In this embodiment, the recess 24 is formed by an end face 241 perpendicular to the outer circumferential surface 230 and a surface 242 perpendicular to the end face 241. In other words, the end face 241 and the surface 242 perpendicular to the end face 241 that constitute the recess 24 form an inverted L shape when viewed from above. The shape of the recess 24 may be any shape that contributes to the fixation of the dental implant body 1 after it is embedded in the jawbone 110. In this embodiment, the recess 24 has a groove-like shape, but it may also be a hole.

[0020] In this embodiment, the recesses 24 are arranged so as to be continuous only with the outer circumferential surface 230 of the male thread portion 23 in the second region R2, excluding the vicinity of the first region R1, and the male thread portion 23 in the third region R3. In other words, the recesses 24 are not arranged on the outer circumferential surface 230 of the male thread portion 23 in the first region R1. With this configuration, when removing the dental implant body 1, it is not necessary to use a tool to cut away the bone surrounding the regenerated bone in the recesses 24 located near the first region R1. This makes it easier to remove the dental implant body 1. The recesses 24 arranged on the outer circumferential surface 230 of the male thread portion 23 in the second region R2 and the recesses 24 arranged on the outer circumferential surface 230 of the male thread portion 23 in the third region R3 do not have to be continuous.

[0021] The recess 24 may reach the rear end 22 of the outer peripheral surface 230 of the male thread portion 23 of the third region R3, but in this embodiment, it is arranged at a location other than the rear end 22. When the dental implant body 1 is embedded in the jawbone 110, the rear end 22 of the dental implant body 1 is located at the boundary between the bone tissue (jawbone 110) and the soft tissue (gums 101). However, if the recess 24 is located at the rear end 22, it may become a route of infection for oral bacteria into the jawbone 110. By arranging the recess 24 at a location other than the rear end 22, it is possible to reduce the risk of the above-mentioned recess 24 becoming a route of infection for oral bacteria into the jawbone 110.

[0022] The recess 24 may be arranged not only at the rear end 22 of the outer peripheral surface 230 of the male thread portion 23 in the third region R3, but also in a portion other than the vicinity of the rear end 22. This can further reduce the risk of the above-mentioned infection route.

[0023] The recess 24 may be disposed only on the outer circumferential surface 230 of the male thread portion 23 in the second region R2. This can further reduce the risk of oral bacteria becoming a route of infection into the jawbone 110.

[0024] As shown in Fig. 3, three recesses 24 are arranged on the outer peripheral surface 230. By arranging a plurality of recesses 24 on the outer peripheral surface 230, the dental implant body 1 can be more firmly fixed to the jawbone 110. The number of recesses 24 may be one. When there are a plurality of recesses 24, the number of recesses 24 is not limited to three as long as there is a plurality of recesses 24.

[0025] As shown in FIG. 3 , the recesses 24 are arranged at positions that are rotationally symmetric with respect to the axis S1 passing through the rotation center of the male thread portion 23. In this embodiment, the recesses 24 are arranged with three-fold symmetry with respect to the axis of the male thread portion 23. By arranging the recesses 24 with rotational symmetry, the dental implant body 1 and the jawbone 110 can be fixed in a balanced manner. The positions of the recesses 24 can be changed depending on the number of recesses 24 arranged on the outer peripheral surface 230. For example, when the number of recesses 24 is four, the recesses 24 may be configured to be four-fold symmetric with respect to the axis of the male thread portion 23. When a plurality of recesses 24 are arranged on the outer peripheral surface 230, the recesses 24 do not have to be arranged at positions that are rotationally symmetric with respect to the axis S1 passing through the rotation center of the male thread portion 23. Furthermore, when there are a plurality of recesses 24, the recesses 24 may be arranged along the axis S1 passing through the rotation center of the male thread portion 23.

[0026] 1 to 3, the recess 24 has an end face 241 along the direction of the axis S1 that passes through the rotation center of the male thread portion 23. The recess 24 does not necessarily have to have the end face 241. In this embodiment, the recess 24 has the end face 241 on the counterclockwise side when viewed from above.

[0027] The recess 24 is provided with a cutting edge portion 2411. Here, the cutting edge portion 2411 functions as a cutting edge when the male thread portion 23 is rotated about an axis S1 passing through the rotation center of the male thread portion 23. In other words, the cutting edge portion 2411 enables the cutting ability of the dental implant body 1 to be strengthened. This makes it easier for the cutting edge portion 2411 to cut the regenerated bone in the recess 24 when the dental implant body 1 is removed from the jawbone 110. This makes it easier to remove the dental implant body 1.

[0028] In this embodiment, the cutting edge portion 2411 is disposed on the thread of the male thread portion 23 of the end surface 241. In other words, at least a portion of the ridge formed by the intersection of the end surface 241 and the outer circumferential surface 230 of the male thread portion 23 becomes the cutting edge portion 2411. The radius of curvature of this ridge may be 100 μm or less. Since the cutting edge portion 2411 is disposed on the thread of the end surface 241 along the axis S1 passing through the rotation center of the male thread portion 23, the cutting edge portion 2411 can be used efficiently when rotating the dental implant 1. The cutting edge portion 2411 does not have to be disposed on the end surface 241, but may be disposed on one of the recesses 24. The cutting edge portion 2411 does not have to be disposed on the recess 24. When the recess 24 is formed by two end surfaces 241 perpendicular to the outer circumferential surface 230, the cutting edge portion 2411 may be disposed on each of the threads of the male thread portions of the two end surfaces 241. In this case, the dental implant body 1 can also be easily removed.

[0029] The first region R1 occupies at least one-eighth and at most two-thirds of the male thread portion 23 in the direction of the axis S1 passing through the center of rotation of the male thread portion 23. This allows the recess 24 to have an appropriate size. In this embodiment, as shown in FIG. 1 , the first region R1 occupies at least three-eighteenths and at most three-eighths of the male thread portion 23 in the direction of the axis S1 passing through the center of rotation of the male thread portion 23. The first region R1 does not have to occupy at least one-eighth and at most two-thirds of the male thread portion 23 in the direction of the axis S1 passing through the center of rotation of the male thread portion 23.

[0030] <Modification> A modified example of this embodiment will be described below with reference to Figures 6 to 8. For the sake of convenience, members having the same functions as those described in the first embodiment above will be denoted by the same reference numerals, and their description may be omitted.

[0031] Fig. 6 is a diagram showing a modified example of the dental implant body 1 shown in Fig. 1. Reference numeral 6001 in Fig. 6 is a front view of the dental implant body 1A. Reference numeral 6002 in Fig. 6 is a right side view of the dental implant body 1A.

[0032] 6, the recess 24A has an end face 241A that is inclined with respect to the direction of the axis S1 (see FIG. 1) passing through the rotation center of the male screw portion 23, unlike the end face 241 of embodiment 1. Even with this configuration, the dental implant body 1A exhibits the same effects as the dental implant body 1 of embodiment 1. Furthermore, the dental implant body 1A that has the end face 241A that is inclined with respect to the direction of the axis S1 passing through the rotation center of the male screw portion 23 exhibits the effect of being able to reduce resistance during implantation.

[0033] Fig. 7 is a diagram showing yet another modified example of the dental implant body 1 shown in Fig. 1. Reference numeral 7001 in Fig. 7 is a front view of the dental implant body 1B. Reference numeral 7002 in Fig. 7 is a right side view of the dental implant body 1B.

[0034] 7, the main body 2B, unlike the main body 2, includes a recess 24B that is arranged so as to be continuous only with the outer circumferential surface 230 of the male thread portion 23 in the second region R2 including the vicinity of the first region R1 and the male thread portion 23 in the third region R3. In other words, the recess 24B is arranged on the outer circumferential surface 230 of the male thread portion 23 in the second region R2 up to the upper end of the first region R1. This makes it easy for the cutting edge portion 2411B to grind the alveolar bone 111 in a clockwise direction when the dental implant body 1B is embedded in the jawbone 110.

[0035] Fig. 8 is a diagram showing a modified example of the dental implant body 1B shown in Fig. 7. Reference numeral 8001 in Fig. 8 is a front view of the dental implant body 1C. Reference numeral 8002 in Fig. 8 is a right side view of the dental implant body 1C. The dental implant body 1C shown in Fig. 8 differs from the dental implant body 1A shown in Fig. 6 in that the recess 24C is arranged on the outer peripheral surface 230 of the male thread portion 23 of the second region R2 up to the upper end of the first region R1.

[0036] 8, the recess 24C has an end face 241C that, unlike the end face 241B, is inclined with respect to the direction of the axis S1 (see FIG. 1) passing through the center of rotation of the male screw portion 23. This makes it possible to reduce resistance due to the contact area between the end face 241C and the alveolar bone 111 in the direction of the axis S1 (see FIG. 1) passing through the center of rotation of the male screw portion 23 when the dental implant body 1C is embedded in the jawbone 110.

[0037] [Embodiment 2] Other embodiments of the present disclosure will be described below with reference to Figures 9 to 13. For ease of explanation, members having the same functions as those described in the above embodiments will be denoted by the same reference numerals, and their description will not be repeated.

[0038] Fig. 9 is a front view showing a dental implant body 1D according to Embodiment 2 of the present disclosure, Fig. 10 is a right side view of the dental implant body 1D shown in Fig. 9, and Fig. 11 is a cross-sectional view taken along line IX-IX in Fig. 9.

[0039] As shown in FIG. 11 , the recess 24D has an end face 241D on the counterclockwise side when viewed from above. The cutting edge portion 2411D has a shape that functions as a cutting edge when rotated counterclockwise (the direction in which the male thread portion 23 is removed). In this embodiment, the recess 24D is formed by an end face 241D perpendicular to the outer circumferential surface 230 and a surface 242D perpendicular to the end face 241D. In other words, the end face 241D and the surface perpendicular to the end face 241D that constitute the recess 24 form an L-shape when viewed from above. Since the cutting edge portion 2411D is disposed in the removal direction in which the male thread portion 23 is removed, the dental implant body 1D can be more easily removed. The direction in which the male thread portion 23 is removed may be clockwise. In this case, the counterclockwise direction is the direction in which the male thread portion 23 is embedded in the jawbone 110.

[0040] <How to remove dental implants> A method for removing the dental implant body 1D according to embodiment 2 will be described below with reference to Fig. 12 and Fig. 13. Fig. 12 is a diagram illustrating a method for removing the dental implant body 1D shown in Fig. 9 from the jawbone 110. Fig. 13 is a diagram illustrating a conventional dental implant body 1E.

[0041] As shown in FIG. 13, the dental implant body 1E is different from the dental implant body 1 in that it has recesses 24E arranged only on the outer circumferential surface 230 of the male thread portion 23 in the first region R1.

[0042] As shown by reference numeral 1201 in Fig. 12, when the dental implant body 1E is surgically implanted in the alveolar bone 111, a space is formed between the recess 24E and the alveolar bone 111. Next, as shown by reference numeral 1202 in Fig. 12, before the dental implant body 1E is removed from the jawbone 110, the jawbone 110 regenerates and fills the recess 24E with the jawbone 110. Furthermore, as shown by reference numeral 1203 in Fig. 12, when the dental implant body 1E is removed from the jawbone 110, the jawbone 110 is ground with a tool from above to below outside the marking 25 to the vicinity of the recess 24E. Then, by rotating the dental implant body 1E counterclockwise, the jawbone 110 in the portion of the recess 24E is ground while the dental implant body 1E is removed from the jawbone 110.

[0043] In contrast, as shown by reference numeral 1204 in FIG. 12 , when the dental implant body 1D is surgically implanted in the alveolar bone 111, a space is formed between the recess 24D and the alveolar bone 111. Next, as shown by reference numeral 1205 in FIG. 12 , before the dental implant body 1D is removed from the jawbone 110, the jawbone 110 is embedded in the recess 24D. As shown by reference numeral 1206 in FIG. 12 , when the dental implant body 1D is removed from the jawbone 110, the mark 25 indicating the position of the recess 24D is used as a landmark, and the jawbone 110 is ground down from above outside the mark 25 to the vicinity of the recess 24D with a tool. In other words, there is no need to ground down from above outside the mark 25 to the vicinity of the tip 21 of the dental implant body 1D with a tool. Therefore, the dental implant body 1D, which is firmly fixed to the jawbone 110, can be more easily removed than the dental implant body 1E. Moreover, damage to the jawbone 110 is smaller than when the dental implant body 1E is extracted from the jawbone 110. Furthermore, the surgical time required to extract the dental implant body 1D from the jawbone 110 can be shortened.

[0044] Then, the dental implant body 1D is rotated counterclockwise to remove it from the jawbone 110 while scraping the jawbone 110 at the recess 24D.

[0045] As described above, the dental implant body 1D does not have a recess 24D in the tapered tip portion 21 and has a rotationally symmetrical shape up to the rear end portion 22 (see Figures 9 to 11), making it easy to remove the dental implant body 1D that is firmly fixed to the jawbone 110.

[0046] The invention according to the present disclosure has been described above based on the drawings and examples. However, the invention according to the present disclosure is not limited to the above-described embodiments. In other words, the invention according to the present disclosure can be modified in various ways within the scope of the present disclosure, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the invention according to the present disclosure. In other words, it should be noted that a person skilled in the art can easily make various modifications or corrections based on the present disclosure. It should also be noted that these modifications or corrections are included in the scope of the present disclosure. [Explanation of symbols]

[0047] 1, 1A, 1B, 1C, 1D, 1E Dental implant body 2, 2B, 2C, 2D, 2E Main body 21 Tip 22 Rear end 23 Male thread 24, 24A, 24B, 24C, 24D, 24E recesses 25 displays 230 Outer surface 241, 241B, 241C, 241D, 241E end face 2411, 2411A, 2411B, 2411C, 2411D, 2411E Cutting edge R1 1st area R2 2nd area R3 3rd area S1 Axis passing through the center of rotation of the male screw

Claims

1. a body having a leading end and a trailing end; the main body portion includes a tapered first region including a tip end portion, a third region closer to a rear end portion than the first region, and a cylindrical second region located between the first region and the third region; a male thread portion disposed from the first region to the outer periphery of the third region, a recessed portion disposed only on an outer peripheral surface of the male threaded portion in the second region, or a recessed portion disposed only on an outer peripheral surface of the male threaded portion in the second region and the male threaded portion in the third region, an outer periphery of the third region is circular when viewed from an axial direction passing through a rotation center of the male thread portion, The dental implant body has, at the rear end, an indication indicating the position where the recess is located on the outer peripheral surface.

2. The dental implant body according to claim 1 , wherein a plurality of the recesses are arranged on the outer peripheral surface.

3. The dental implant body according to claim 2 , wherein the recess is disposed at a position that is rotationally symmetrical with respect to the axis of the male thread portion.

4. A main body having a tip end and a rear end, the main body portion includes a tapered first region including a tip end portion, a third region closer to a rear end portion than the first region, and a cylindrical second region located between the first region and the third region; a male thread portion disposed from the first region to the outer periphery of the third region, a recessed portion disposed only on an outer peripheral surface of the male threaded portion in the second region, or a recessed portion disposed only on an outer peripheral surface of the male threaded portion in the second region and the male threaded portion in the third region, an outer periphery of the third region is circular when viewed from an axial direction passing through a rotation center of the male thread portion, The recess has a cutting edge portion, The dental implant body has a shape in which the cutting edge portion functions as a cutting edge when the male thread portion is rotated in the direction of removal.

5. the recess has an end surface along the axial direction of the male thread portion, The dental implant body according to claim 4 , wherein the cutting edge portion is disposed on the thread of the end surface.

6. The dental implant body according to any one of claims 1 to 5, wherein the recess is disposed at a location other than the rear end portion.

7. The dental implant body according to any one of claims 1 to 5, wherein the first region occupies at least one-eighth and at most two-thirds of the male thread portion in the axial direction of the male thread portion.

Images