JP6389578B1 - Dental implant fixture - Google Patents

Abstract

Disclosed is a dental implant fixture that is excellent in early engraftment and has high stability against vertical and rotational occlusal forces. A dental implant fixture 100 is a cylindrical dental implant fixture that is embedded in and bonded to an alveolar bone, and is located in the cancellous bone of the alveolar bone when embedded in the alveolar bone. A first part 132 and a second part located in the cortical bone of the alveolar bone when embedded in the alveolar bone, extending in the circumferential direction on the outer peripheral surface of the second part, and in the direction of the central axis AX A plurality of wave grooves 134a that are displaced to each other are formed. [Selection] Figure 1

Description

  The present invention relates to a dental implant, and more particularly to a dental implant fixture that is embedded and bonded to an alveolar bone.

  2. Description of the Related Art Conventionally, treatment using a dental implant has been widely used as a treatment means when a permanent tooth root is lost due to periodontal disease, trauma, or the like.

  The dental implant is attached to the fixture with an artificial tooth root (hereinafter referred to as “fixture” or “dental implant fixture”) that is embedded and fixed in the alveolar bone (jaw bone) of the part where the tooth is lost. And a prosthesis that is attached to the abutment and functions as an artificial tooth. For example, Patent Document 1 discloses a dental implant having such a configuration.

  In such a dental implant, the fixture is embedded in the alveolar bone for a long period of time, and the outer peripheral surface of the base end (abutment side end) side of the fixture is engrafted with the cortical bone. An extremely large occlusal force is applied to the proximal end of the. Accordingly, in such a dental implant fixture, the surface shape on the proximal end side in direct contact with the cortical bone is extremely important from the viewpoint of early engraftment and stability against occlusal force. Proposals have been made.

  For example, Patent Document 1 describes a configuration in which the base end side of the fixture has a larger diameter than the tip end side, and spiral microthreads (fine irregularities) are provided on the outer peripheral surface thereof.

JP 2010-136943 A

  According to the configuration described in Patent Document 1, it is said that the peak stress at the marginal bone site can be reduced by the microthread, the load can be distributed to the average, and the connection with the bone tissue can be promoted. ing. However, since the microthread of Patent Document 1 is a spiral thread, the load can be distributed with respect to the load in the vertical direction (that is, the axial direction) with respect to the fixture, but the load in the rotational direction. There is a problem that the effect of distributing the load hardly works. Compared to a configuration without microthreads, the provision of microthreads increases the surface area, which tends to promote the binding with bone tissue, but there is a need for an excellent early engraftment in the market. It has been.

  The present invention has been made in view of such circumstances, and provides a dental implant fixture that is excellent in early engraftment and that has high stability against occlusal forces in the vertical and rotational directions. For the purpose.

  In order to achieve the above object, the present inventor has intensively studied to form a plurality of annular wave grooves on the outer peripheral surface (that is, the outer peripheral surface facing the cortical bone) on the base end side of the fixture. The present inventors have found that a dental implant fixture that is excellent in early engraftment and has high stability with respect to the occlusal force in the vertical direction and the rotational direction can be obtained, and the present invention has been completed.

That is, the dental implant fixture of the present invention is a columnar dental implant fixture that is embedded and bonded to the alveolar bone, and is located in the cancellous bone of the alveolar bone when embedded in the alveolar bone. A first part and a second part located in the cortical bone of the alveolar bone when embedded in the alveolar bone, extending on the outer circumferential surface of the second part in the circumferential direction and displaced in the central axis direction Are formed at a predetermined pitch in the central axis direction, the groove width of each wave groove is approximately ½ of the pitch, and the shape of the groove bottom of each wave groove is the groove width It is a semicircle having a radius of approximately ½ .

  Further, each wave groove repeats a constant waveform pattern extending in the circumferential direction on the outer peripheral surface of the second part and displacing in the central axis direction N times (N is an integer of 1 or more) in the circumferential direction. It is desirable to have a shape. In this case, the waveform pattern is preferably a sine curve.

  Moreover, it is desirable that self-tap threads are formed on the outer peripheral surface of the first part.

  As described above, according to the present invention, a dental implant fixture that is excellent in engraftment and has high stability with respect to an occlusal force in the vertical direction and the rotational direction is realized.

It is a figure which shows schematic structure of the dental implant fixture which concerns on embodiment of this invention. FIG. 2 is a diagram illustrating a state in which the dental implant fixture according to the embodiment of the present invention is implanted. FIG. 3 is a diagram illustrating a second portion of the dental implant fixture according to the first embodiment of the present invention. FIG. 4 is a diagram illustrating a second portion of the dental implant fixture according to the second embodiment of the present invention. FIG. 5 is a view showing a second part of the dental implant fixture of Comparative Example 1 of the present invention. FIG. 6 is a diagram showing a second part of the dental implant fixture of Comparative Example 2 of the present invention. FIG. 7 is a view showing a second part of the dental implant fixture of Comparative Example 3 of the present invention. FIG. 8 is a diagram showing a second part of the dental implant fixture of Comparative Example 4 of the present invention. FIG. 9 is a diagram showing a second part of the dental implant fixture of Comparative Example 5 of the present invention. FIG. 10 is a diagram showing a second part of the dental implant fixture of Comparative Example 6 of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, unless specifically stated, the components, types, combinations, materials, shapes, relative arrangements, and the like described in this embodiment are not merely intended to limit the scope of the present invention, but are merely illustrative examples. Not too much. In addition, the same code | symbol is attached | subjected to the same or an equivalent part in a figure, and the description is not repeated.

(Configuration of fixture 100)
FIG. 1 is a diagram illustrating a schematic configuration of a fixture 100 according to an embodiment of the present invention, FIG. 1A is a front view of the fixture 100, and FIG. 1B is a diagram of the fixture 100. It is sectional drawing. FIG. 2 is a diagram illustrating a state in which the fixture 100 according to the embodiment of the present invention is embedded.

  The fixture 100 of the present embodiment is a so-called dental implant fixture, and is a member that is embedded and fixed in an embedding hole formed in the alveolar bone (jaw bone) 10 in advance. As shown in FIG. 2, in the dental implant treatment, after the fixture 100 is fixed to the alveolar bone 10, an abutment 200 is attached to the fixture 100 so as to protrude from the gum 20, and further the abutment The prosthesis 300 is attached to the ment 200.

  As shown in FIG. 1, the fixture 100 main body has a substantially cylindrical shape, and includes a distal end portion 110, a proximal end portion 120, an outer peripheral portion 130, a connecting portion 140, and the like. When the fixture 100 is embedded in the alveolar bone 10, the distal end portion 110 is located on the cancellous bone 13 side of the alveolar bone 10, and the proximal end portion 120 is located on the cortical bone 12 side of the alveolar bone 10. (FIG. 2). In addition, pure titanium and titanium alloy (for example, Ti-15Mo-5Zr-3Al, Ti-6Al-4V etc.) which have affinity with the alveolar bone 10 are used for the base material of the fixture 100.

  As shown in FIG. 1, the outer peripheral part 130 of the fixture 100 of this embodiment is comprised from the 1st site | part 132 located in the front-end | tip part 110 side, and the 2nd site | part 134 located in the base end part 120 side. . The first part 132 of the fixture 100 is a part located in the cancellous bone 13 when the fixture 100 is embedded in the alveolar bone 10, and a thread 132 a is formed on the outer peripheral surface of the first part 132. . The screw threads 132a extend spirally at equal intervals (for example, 1 mm pitch (double thread)) toward the distal end portion 110 side, and the fixture is attached to a hole formed in the alveolar bone 10 when the fixture 100 is attached. When 100 is inserted and rotated, the fixture 100 is screwed into the alveolar bone 10 by self-tapping.

  The second part 134 of the fixture 100 is a part located in the cortical bone 12 when the fixture 100 is embedded in the alveolar bone 10. A plurality of (for example, eight) annular wave grooves 134 a that extend in the circumferential direction on the outer peripheral surface and are displaced in the direction of the central axis AX are formed on the outer peripheral surface of the second portion 134. Specifically, each wave groove 134a of the present embodiment is, for example, a groove having a groove width of 0.2 mm, a depth of 0.1 mm, and a pitch (interval in the central axis AX direction) of 0.4 mm. Further, in the present embodiment, each wave groove 134a has a shape in which a sinusoidal waveform pattern that extends in the circumferential direction on the outer peripheral surface and is displaced in the direction of the central axis AX is repeated four times in the circumferential direction. Presents. That is, the shape of the waveform of each wave groove 134a of the present embodiment is represented by Y × sin (4θ), where Y is the amplitude (displacement in the direction of the central axis AX) and Y is the angle with respect to the central axis AX. be able to.

  The connecting part 140 is a bottomed hole formed on the base end part 120 side of the fixture 100 and is a part that accommodates and fixes the abutment 200. The connecting portion 140 includes a screw hole 140 a that is screwed with a screw portion (not shown) formed at the distal end portion of the abutment 200, and an accommodating portion 140 b that accommodates the distal end portion of the abutment 200. In the dental implant treatment, the abutment 200 is screwed into the screw hole 140a, and the distal end portion of the abutment 200 is accommodated and fixed in the accommodating portion 140b. Then, a prosthesis 300 that functions as an artificial tooth is attached to the proximal end side of the abutment 200 (FIG. 2).

  As described above, in the fixture 100 of the present embodiment, a plurality of annular wave grooves 134 a are formed on the outer peripheral surface of the second portion 134 located in the cortical bone 12. For this reason, the surface area in contact with the cortical bone 12 is increased, and the engraftment is excellent. Further, the corrugated bone 12 is formed when stress in the vertical direction (center axis AX direction) is applied by forming a wave groove 134a that extends in the circumferential direction on the outer peripheral surface and is displaced in the direction of the center axis AX. A frictional force is generated between the cortical bone 12 and the cortical bone 12 when a rotational stress is applied. For this reason, the fixture 100 of this embodiment has high stability with respect to the biting force in the vertical direction and the rotation direction (details will be described later).

(Manufacturing method of fixture 100)
A pure titanium rod is used as a base material, and this is cut to produce a fixture 100 having the shape shown in FIG. In addition, since it is preferable that the outer peripheral part 130 couple | bonded with the alveolar bone 10 is a rough surface called a moderate rough surface from a viewpoint of omission prevention, it is a sandblast process by the metal oxide particle | grains, such as an alumina, a hydroxyapatite, and a titanium oxide. I do. Further, if necessary, in addition to the sandblast treatment, etching treatment is performed with hydrochloric acid, sulfuric acid, or the like.

  Hereinafter, the specific configuration of the wave groove 134a of the fixture 100 of the present embodiment and the operation and effects thereof will be described in more detail with reference to Examples 1 and 2 and Comparative Examples 1 to 6. FIGS. 3-10 is a figure which shows the 2nd site | part of the fixture of Examples 1, 2 and Comparative Examples 1-6, respectively. Example 1 and Example 2 differ only in the outer diameter of the fixture 100, and Example 1 and Comparative Examples 1 to 3 and Example 2 and Comparative Examples 4 to 6 differ only in the configuration of the second part of the fixture, respectively. 3 to 10, only the second portion of the fixture is shown, and other configurations are omitted.

Example 1
As shown in FIG. 3, the second portion 134 of the fixture 100 of the first embodiment has an outer diameter of 3.5 mm and a length of 4 mm, and eight annular wave grooves 134 a are formed on the outer peripheral surface. It is formed at a pitch of 0.4 mm in the direction of the central axis AX from a position of 0.4 mm from the portion 120. Each wave groove 134a has a groove width of 0.2 mm, a depth of 0.1 mm, and an amplitude (displacement in the direction of the central axis AX) of 0.4 mm. The groove bottom of the wave groove 134a is a semicircle of R0.1. did.

(Example 2)
As shown in FIG. 4, the second portion 134 of the fixture 100 of the second embodiment has an outer diameter of 4.0 mm and a length of 4 mm, and eight annular wave grooves 134a are formed on the outer peripheral surface. It is formed at a pitch of 0.4 mm in the direction of the central axis AX from a position of 0.4 mm from the portion 120. Each wave groove 134a has a groove width of 0.2 mm, a depth of 0.1 mm, and an amplitude (displacement in the direction of the central axis AX) of 0.4 mm. The groove bottom of the wave groove 134a is a semicircle of R0.1. did.

(Comparative Example 1)
As shown in FIG. 5, the second part 1341 of the fixture 1001 of Comparative Example 1 has an outer diameter of 3.5 mm and a length of 4 mm, and no groove is formed on the outer peripheral surface.

(Comparative Example 2)
As shown in FIG. 6, the second portion 1342 of the fixture 1002 of Comparative Example 2 has an outer diameter of 3.5 mm and a length of 4 mm. It is formed from a position of 0.4 mm. The pitch of the V grooves 1342a in the direction of the central axis AX is 0.4 mm. The V groove 1342a has a groove width of 0.2 mm and a depth of 0.1 mm, and the groove bottom angle is 45 °.

(Comparative Example 3)
As shown in FIG. 7, the second portion 1343 of the fixture 1003 of Comparative Example 3 has an outer diameter of 3.5 mm and a length of 4 mm, and eight annular grooves 1343a are formed on the outer peripheral surface of the base end portion. It is formed at a pitch of 0.4 mm from the position 1203 to 0.4 mm in the direction of the central axis AX. Each groove 1343a has a groove width of 0.2 mm and a depth of 0.1 mm, and the groove bottom of the groove 1343a is a semicircle of R0.1.

(Comparative Example 4)
As shown in FIG. 8, the second portion 1344 of the fixture 1004 of Comparative Example 4 has an outer diameter of 4.0 mm and a length of 4 mm, and no groove is formed on the outer peripheral surface.

(Comparative Example 5)
As shown in FIG. 9, the second portion 1345 of the fixture 1005 of the comparative example 5 has an outer diameter of 4.0 mm and a length of 4 mm, and a spiral V groove 1345 a is formed on the outer peripheral surface from the proximal end portion 1205. It is formed from a position of 0.4 mm. The pitch of the V grooves 1345a in the direction of the central axis AX is 0.4 mm. The V groove 1345a has a groove width of 0.2 mm and a depth of 0.1 mm, and the groove bottom angle is 45 °.

(Comparative Example 6)
As shown in FIG. 10, the second portion 1346 of the fixture 1006 of the comparative example 6 has an outer diameter of 4.0 mm and a length of 4 mm, and eight annular grooves 1346a are formed on the outer peripheral surface of the base end portion. It is formed at a pitch of 0.4 mm from the position 1206 to 0.4 mm in the direction of the central axis AX. Each groove 1346a has a groove width of 0.2 mm and a depth of 0.1 mm, and the groove bottom of the groove 1346a is a semicircle of R0.1.

(Examination of early engraftment)
About Example 1, 2, and Comparative Examples 1-6, the early engraftment property was examined. It is known that the surface roughness (that is, the surface area) of the fixture 100 is important as to whether or not the fixture 100 is engrafted early on the alveolar bone 10. Therefore, in the study of early engraftment, fixture models of Examples 1 and 2 and Comparative Examples 1 to 6 are created, and the total surface area of each second part and each second part are used using 3D CAD. The surface area for one rotation of each formed groove was measured. And Example 1 and Comparative Examples 1-3 were compared, Example 2 and Comparative Examples 4-6 were compared, and the effectiveness of the structure of Examples 1 and 2 was verified. Tables 1 and 2 are tables showing the results of studies on early engraftment. The “contrast” in Table 1 is “1” when the entire surface area of the second portion 134 of Example 1 and the surface area for one rotation of the wave groove 134a formed in the second portion 134 are respectively “1”. It is the ratio of the surface area for one rotation of each groove | channel formed in each 2nd site | part of the whole 2nd site | part of Comparative Examples 1-3. Further, the “contrast” in Table 2 indicates that the entire surface area of the second portion 134 of Example 2 and the surface area for one rotation of the wave groove 134a formed in the second portion 134 are “1”, respectively. It is the ratio of the surface area for one rotation of each groove | channel formed in each 2nd site | part of the whole 2nd site | part of Comparative Examples 4-6. In Comparative Example 1 and Comparative Example 4, since no groove was formed in the second part, the surface area for one rotation with a width of 0.2 mm was obtained, and this was defined as the surface area corresponding to the groove.

  As shown in Table 1, the entire surface area of the second part 134 of Example 1 and the surface area of the wave groove 134a formed in the second part 134 are equivalent to those of Comparative Example 3, and compared with Comparative Examples 1 and 2. And you can see that it ’s big. As shown in Table 2, the entire surface area of the second part 134 of Example 2 and the surface area of the wave groove 134a formed in the second part 134 are equivalent to those of Comparative Example 6, and compared with Comparative Examples 4 and 5. And you can see that it ’s big. From this, it can be seen that Examples 1 and 2 have higher early fixability than Comparative Examples 1, 2, 4, and 5 (that is, compared with the conventional configuration).

(Examination of stability against occlusal force in vertical and inclined directions)
About Example 1, 2 and Comparative Examples 1-6, stability with respect to the biting force (vertical, inclination) was examined. The fixture 100 embedded in the alveolar bone 10 by the implant treatment is in direct contact with the tissue of the alveolar bone 10 unlike the natural tooth, so that the impact of the occlusal pressure applied is directly transmitted to the alveolar bone 10, When the stress increases and a large bite pressure is applied, the fixture 100 is broken or directly absorbed by the alveolar bone 10. Therefore, in the examination of the stability against the occlusal force (vertical, inclined), the abutment 200 and the prosthesis 300 model are combined with the fixture models of Examples 1 and 2 and Comparative Examples 1 to 6, and the cortical bone 12 The model was assumed to be cancellous bone 13 and an analysis model was constructed. The fixtures of Examples 1 and 2 and Comparative Examples 1 to 6 were tilted in the range of 0 to 30 °, loaded with 1000 N perpendicular to the occlusal surface, and stress analysis was performed by a finite element method. And Example 1 and Comparative Examples 1-3 were compared, Example 2 and Comparative Examples 4-6 were compared, and the effectiveness of the structure of Examples 1 and 2 was verified. Tables 3 and 4 are tables showing the results of studying stability against occlusal force (vertical and inclined). The “contrast” in Table 3 indicates that the fixtures of Comparative Examples 1 to 3 are the cortical bone 12 when the stress applied to the cortical bone 12 and the cancellous bone 13 by the fixture 100 of Example 1 is “1”, respectively. And the ratio of stress applied to the cancellous bone 13. The “contrast” in Table 4 indicates that the fixtures of Comparative Examples 4 to 6 are the cortical bone 12 when the stress applied to the cortical bone 12 and the cancellous bone 13 by the fixture 100 of Example 2 is “1”, respectively. And the ratio of stress applied to the cancellous bone 13. In the cortical bone 12 model, the cortical bone thickness was 1.6 mm and 3.2 mm, and in the cancellous bone 13 model, the cancellous bone thickness was 22 mm. Further, the abutment 200 was made of pure titanium, the prosthesis 300 was made of a gold alloy (Type III), and the connection screw connecting each fixture and the abutment 200 was made of pure titanium. In Tables 3 and 4, “vertical” indicates that the fixtures of Examples 1 and 2 and Comparative Examples 1 to 6 are 0 °, and “inclination” indicates Examples 1 and 2 and Comparative Example 1. This shows the case where the fixtures ˜6 are 30 °.

  As shown in Table 3, it can be seen that the stress applied to the cortical bone 12 and cancellous bone 13 by the fixture 100 of Example 1 is equivalent to that of Comparative Examples 1 and 2, and is smaller than that of Comparative Example 3. As shown in Table 4, it can be seen that the stress applied to the cortical bone 12 and cancellous bone 13 by the fixture 100 of Example 2 is equivalent to that of Comparative Examples 4 and 5, and is smaller than that of Comparative Example 6. From this, it can be seen that Examples 1 and 2 are superior in stability to occlusal force (vertical and inclined) as compared with Comparative Examples 3 and 6 (that is, compared with the conventional configuration).

(Examination of stability against rotational occlusal force)
About Example 1, 2 and Comparative Examples 1-6, stability with respect to the biting force (rotation) was examined. The fixture 100 embedded in the alveolar bone 10 by the implant treatment is subjected to not only vertical and inclined stresses but also rotational stresses due to the impact of the occlusal pressure applied. Was examined. In the examination of the stability with respect to the occlusal force (rotation), the fixture models of Examples 1 and 2 and Comparative Examples 1 to 6 were embedded in the model assuming the cortical bone 12, and an analysis model was constructed. Then, a rotational moment of 1000 N was given to the surface of the model assuming the cortical bone 12, and the stress analysis was performed by the finite element method. And Example 1 and Comparative Examples 1-3 were compared, Example 2 and Comparative Examples 4-6 were compared, and the effectiveness of the structure of Examples 1 and 2 was verified. Tables 5 and 6 are tables showing the results of studying the stability against occlusal force (rotation). The “contrast” in Table 5 indicates the stress applied to the cortical bone 12 by the fixtures of Comparative Examples 1 to 3 when the stress applied to the cortical bone 12 by the fixture 100 of Example 1 is “1”. It is a ratio. The “contrast” in Table 6 shows the stress applied to the cortical bone 12 by the fixtures of Comparative Examples 4 to 6 when the stress applied to the cortical bone 12 by the fixture 100 of Example 2 is “1”. It is a ratio. In the cortical bone 12 model, the cortical bone size was set to φ10 × 10 mm.

  As shown in Table 5, it can be seen that the stress applied to the cortical bone 12 by the fixture 100 of Example 1 is smaller than those of Comparative Examples 1 to 3. As shown in Table 6, it can be seen that the stress applied to the cortical bone 12 by the fixture 100 of Example 2 is smaller than those of Comparative Examples 4-6. From this, it can be seen that Examples 1 and 2 are superior in stability to occlusal force (rotation) as compared with Comparative Examples 1 to 6 (that is, compared with the conventional configuration).

  As described above, in the fixture 100 of the present embodiment, the plurality of annular wave grooves 134a are formed on the outer peripheral surface of the second portion 134 located in the cortical bone 12, so that the surface area in contact with the cortical bone 12 is increased. It becomes large and has excellent engraftment. Further, since the wave groove 134a is formed, it has high stability against the biting force in the vertical direction and the rotation direction.

  The above is the description of the embodiments and examples of the present invention. However, the present invention is not limited to the above-described configuration, and various modifications can be made within the scope of the technical idea of the present invention. .

  For example, in the description of the present embodiment, each wave groove 134a repeats a sinusoidal waveform pattern that extends in the circumferential direction on the outer peripheral surface and is displaced in the direction of the central axis AX four times in the circumferential direction. However, the present invention is not limited to such a configuration. The shape may be repeated N times (N is an integer of 1 or more) in the circumferential direction, and the number of repetitions is adjusted. Thereby, stability with respect to the biting force in the rotation direction can be adjusted. Further, it is not always necessary to use a sinusoidal waveform pattern. For example, a repeating pattern that is displaced in the direction of the central axis AX, such as a triangular wave or a rectangular wave, may be formed.

  In the present embodiment, the eight wave grooves 134a are formed. However, the present invention is not limited to such a configuration. By adjusting the number of the wave grooves 134a, it is possible to prevent early engraftment and occlusal force. Stability can be adjusted.

  In addition, it should be understood that the embodiment disclosed this time is illustrative in all respects and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 10 Alveolar bone 12 Cortical bone 13 Cancellous bone 20 Gum 100, 1001, 1002, 1003, 1004, 1005, 1006 Fixture 110 Tip part 120, 1202 Base end part 130 Outer part 132 First part 132a Thread 134, 1341, 1342 , 1343, 1344, 1345, 1346 Second part 134a Wave groove 140 Connection part 140a Screw hole 140b Housing part 200 Abutment 300 Prosthesis 1342a, 1345a V-groove 1343a, 1346a Groove

Claims (4)

A cylindrical dental implant fixture that is embedded in and bonded to the alveolar bone,
A first site located in the cancellous bone of the alveolar bone when embedded in the alveolar bone;
A second site located in the cortical bone of the alveolar bone when embedded in the alveolar bone;
With
A plurality of wave grooves extending in the circumferential direction on the outer peripheral surface of the second part and displaced in the central axis direction are formed at a predetermined pitch in the central axis direction ,
The groove width of each wave groove is approximately ½ of the pitch,
The dental implant fixture , wherein the shape of the groove bottom of each of the wave grooves is a semicircular shape having a radius approximately half of the groove width . Each of the wave grooves repeats a constant waveform pattern extending in the circumferential direction on the outer peripheral surface of the second portion and displacing in the central axis direction N times (N is an integer of 1 or more) in the circumferential direction. The dental implant fixture according to claim 1 , wherein the dental implant fixture has a curved shape. The dental implant fixture according to claim 2 , wherein the waveform pattern is a sinusoidal curve. The dental implant fixture according to any one of claims 1 to 3 , wherein a self-tap thread is formed on an outer peripheral surface of the first part.

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