JP6637278B2 - Dental implant system - Google Patents

Description

  The present invention relates to a fixture for a dental implant, and a dental implant system and a dental implant including the fixture.

  Conventionally, a dental implant fixture (hereinafter sometimes referred to as a “fixture”) is implanted into the alveolar bones of the upper and lower jaw bones to restore an occlusal function, a vocal function, an aesthetic property, and the like. Implant surgery is performed (for example, refer to Patent Documents 1 to 3).

  It is desirable that the fixture implanted in the alveolar bone be firmly fixed in the bone. When the implant is removed from the alveolar bone due to an infection or the like, it is desirable that the fixture can be easily removed in a minimally invasive manner without damaging the surrounding bone tissue in which the fixture is implanted.

JP-A-11-33039 Japanese Patent Publication No. 11-501856 JP 2003-525690A

  An object of the present invention is to provide a dental implant fixture having excellent intraosseous fixation and removal properties, and a dental implant system and a dental implant including the same.

The present inventors have conducted intensive studies to solve the above problems, and as a result, have found a solution having the following configuration, and have completed the present invention.
(1) A substantially cylindrical bottomed main body portion, a pin insertion hole penetrating between an inner peripheral surface and an outer peripheral surface of a side wall portion of the main body portion, and a pin tip portion is directed outward from the outer peripheral surface. And a pin inserted into the pin insertion hole in a protrudable state.
(2) The fixture for a dental implant according to (1), wherein the pin has a head connected to a rear end of the pin and having an outer diameter larger than an inner diameter of the pin insertion hole.
(3) The dentist according to (1) or (2), wherein the plurality of pin insertion holes are provided, and the plurality of pin insertion holes are located at an interval from each other along a longitudinal direction of the main body. Fixture for implant.
(4) Any of (1) to (3) above, wherein a plurality of the pin insertion holes are provided, and the plurality of pin insertion holes are located at intervals from each other along a circumferential direction of the main body. The fixture for a dental implant as described.
(5) a plurality of the pin insertion holes, the plurality of pin insertion holes having a rotational symmetry with respect to a center axis of the main body in a cross-sectional view perpendicular to a longitudinal direction of the main body; The fixture for a dental implant according to any one of 1) to (4).
(6) The fixture for a dental implant according to any one of (1) to (5), wherein the outer peripheral surface is a curved surface.
(7) The fixture for a dental implant according to (6), further including a coating layer laminated on the outer peripheral surface.
(8) The (1) to (7), wherein the outer peripheral surface has a tapered region which is located on a tip end side of the main body portion and an outer diameter of the main body portion decreases toward the tip end portion. The fixture for dental implant according to any one of the above.
(9) The fixture for dental implant according to any one of (1) to (8), and the pin is inserted outward into a hollow portion surrounded by a bottom portion and the inner peripheral surface of the main body. A substantially rod-shaped extruding member for extruding toward the dental implant system.
(10) The dental implant system according to (9), wherein in a cross-sectional view perpendicular to the longitudinal direction of the extrusion member, the extrusion member has a region in which a radius of the extrusion member gradually increases along a circumferential direction.
(11) The dental implant system according to (9) or (10), wherein when the pushing member is inserted into the hollow portion, a center axis of the pushing member is coaxial with a center axis of the main body.
(12) Any of the above (9) to (11), further comprising a retraction member inserted into the hollow portion, engaged with the pin rear end side of the pin, and pulling back the pin tip portion toward the hollow portion side. A dental implant system according to any one of the above.
(13) The dental implant system according to (12), wherein the retraction member has a slit that sandwiches the pin rear end side.
(14) The dental implant fixture according to any one of (1) to (8), and a structural component attached to a rear end of the main body of the dental implant fixture. Dental implant.
(15) A substantially bar-shaped pushing member inserted into a hollow portion surrounded by the bottom portion of the main body and the inner peripheral surface and pushing the pins outward is further provided in a state attached to the structural component. The dental implant according to (14).

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that it is excellent in the in-bone fixation property and the removal property.

It is a figure which shows the fixture for dental implants which concerns on one Embodiment of this invention, (a) is a schematic explanatory drawing which shows the state where a pin front-end | tip part does not protrude, (b) is the state where a pin front-end | tip part protrudes. FIG. 2A and 2B are diagrams showing the fixture for a dental implant shown in FIG. 1, wherein FIG. 1A is an enlarged cross-sectional view showing a state cut along line II of FIG. 1A, and FIG. It is sectional drawing which expands and shows the state cut | disconnected along the II-II line of b). FIG. 2 is a schematic explanatory view showing a state where the dental implant fixture shown in FIG. 1 is embedded in alveolar bone. It is a schematic explanatory drawing showing the fixture for dental implants concerning other embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the dental implant system which concerns on one Embodiment of this invention, (a) is schematic explanatory drawing which shows the state in which a pin front-end | tip part does not protrude, (b) is the outline which shows the state in which a pin front-end | tip part protrudes. FIG. It is a figure which shows the dental implant system shown in FIG. 5, (a) is sectional drawing which expands and shows the state cut | disconnected along the III-III line of (a) of FIG. 5, (b) is FIG. 5 (b). FIG. 4 is an enlarged cross-sectional view showing a state cut along line IV-IV of FIG. It is a figure which shows the extrusion member with which the dental implant system shown in FIG. 5 is provided, (a) is a side view, (b) is sectional drawing which expands and shows the state cut | disconnected along the VV line of (a). is there. It is a figure which expands and shows the retraction member with which the dental implant system shown in FIG. 5 is provided, (a) is a front view, (b) is a VI arrow side view except a cap of (a). (A) And (b) is a schematic explanatory view which expands and shows the state which pulls back the pin front-end | tip part using the pullback member shown in FIG.

<Fixture for dental implants>
Hereinafter, a fixture for a dental implant according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

  As shown in FIG. 1, the fixture 1 of the present embodiment includes a substantially cylindrical bottomed main body 2. The main body 2 has a front end 21, a rear end 22, and a side wall 23. Further, the main body 2 has a bottom portion 24 located on the tip portion 21 side, a hollow portion 25 surrounded by the bottom portion 24 and the inner peripheral surface 231 of the side wall portion 23, and an opening portion opening at the rear end portion 22. 26.

  Here, the fixture 1 of the present embodiment further includes a plurality of pin insertion holes 3 and a plurality of pins 4 in addition to the main body 2 described above. As shown in FIGS. 1 and 2, each of the plurality of pin insertion holes 3 penetrates between the inner peripheral surface 231 and the outer peripheral surface 232 of the side wall 23 of the main body 2. Further, as shown in FIGS. 1A and 2A, each of the plurality of pins 4 is such that the pin tip 41 can protrude outward from the outer peripheral surface 232 as indicated by an arrow a. Each of the plurality of pin insertion holes 3 is inserted. According to these configurations, it is possible to exhibit excellent intraosseous fixation and removal properties as described below.

  That is, as shown in FIG. 3, after the fixture 1 is embedded in the alveolar bone 100 of the jaw bone, each of the pin tips 41 of the plurality of pins 4 is projected outward from the outer peripheral surface 232 to form a bone. It can be pressed into tissue. As a result, the fixture 1 can be firmly fixed to the alveolar bone 100, and it is possible to exhibit excellent intraosseous fixation. When the embedded fixture 1 is removed from the alveolar bone 100 due to an infection or the like, the pin tip 41 is pulled back to the hollow portion 25 side, so that excellent removal properties can be exhibited. Therefore, the fixture 1 can be easily removed in a minimally invasive manner while suppressing damage to the surrounding bone tissue in which the fixture 1 is embedded.

  The number of pin insertion holes 3 and the number of pins 4 are the same. The number of each of the pin insertion holes 3 and the pins 4 may be at least one. The number of each of the pin insertion holes 3 and the pins 4 is preferably 1 to 36, more preferably 12 to 24, but is not limited thereto. In addition, it is preferable that the number of each of the pin insertion holes 3 and the pins 4 is plural as in the present embodiment, from the viewpoint of improving the intraosseous fixation.

  As shown in FIG. 2B, the protrusion length L of the pin tip 41 is preferably 0.1 to 1.0 mm, more preferably 0.1 to 0.5 mm. There is no limitation to these.

  In the present embodiment, each of the plurality of pins 4 has the following shape. That is, the entire shape of the pin 4 is substantially cylindrical. The shape of the pin tip 41 is substantially curved. Note that the shape of the pin 4 is not limited to the shape described above.

  In the present embodiment, as shown in FIG. 2B, each of the plurality of pins 4 has a head 43. The head 43 is connected to the pin rear end portion 42, and its outer diameter W1 is larger than the inner diameter W2 of the pin insertion hole 3. That is, the outer diameter W1 and the inner diameter W2 have a relationship of W1> W2. According to such a configuration, since the head 43 functions as a stopper, it is possible to suppress the pin 4 from coming out of the pin insertion hole 3.

  The head 43 may be formed as a separate member from the pin 4 or may be formed integrally with the pin 4. In the present embodiment, the head 43 is formed integrally with the pin 4. To be integrally molded means that the whole molded body is integrally formed from the same material without using joining means, instead of being integrated using joining means such as welding after processing for each part It means that it is manufactured. Examples of the method of integrally forming include, for example, cutting and the like, but are not limited thereto.

  As shown in FIG. 2A, the head 43 of this embodiment has a reduced diameter portion 431. The reduced diameter portion 431 is a portion of the head 43 that is located on the pin rear end portion 42 side and is reduced in diameter toward the pin rear end portion 42. According to such a configuration, a slit 63 of the pull-back member 6 described later can easily sandwich the pin rear end portion 42 (see FIGS. 8B and 9).

  In the present embodiment, as shown in FIG. 1A, the plurality of pin insertion holes 3 are located at intervals from each other along the longitudinal direction b of the main body 2. The plurality of pin insertion holes 3 may be located at regular intervals along the longitudinal direction b, or may be located at irregular intervals. In the present embodiment, the plurality of pin insertion holes 3 are located at equal intervals along the longitudinal direction b.

  In the present embodiment, as shown in FIG. 2A, the plurality of pin insertion holes 3 are located at an interval along the circumferential direction c of the main body 2. The plurality of pin insertion holes 3 may be located at equal intervals along the circumferential direction c, or may be located at irregular intervals. In the present embodiment, the plurality of pin insertion holes 3 are located at equal intervals along the circumferential direction c.

  In the present embodiment, in a cross-sectional view (see FIG. 2) perpendicular to the longitudinal direction b (see FIG. 1A) of the main body 2, the plurality of pin insertion holes 3 are based on the center axis X1 of the main body 2. And has rotational symmetry. Specifically, in the cross-sectional view described above, the plurality of pin insertion holes 3 have a rotational symmetry of 180 ° with respect to the center axis X1. The rotational symmetry is not limited to 180 °, but may be, for example, 90 °, 120 °, or the like. As shown in FIG. 1, the central axis X1 of the main body 2 is an axis extending between the front end 21 and the rear end 22 of the main body 2, and becomes a rotation axis when the fixture 1 is rotated. Shall mean the axis.

  The fixture 1 of the present embodiment has a curved outer peripheral surface 232. In other words, the fixture 1 of the present embodiment has no threaded portion formed on the outer peripheral surface 232. According to such a configuration, when the fixture 1 is implanted into the alveolar bone 100, the pressure on the bone is less than that of the fixture in which the screw portion is formed on the outer peripheral surface, so that excellent embedding property is achieved. Can be exhibited. Further, when the coating layer is laminated on the outer peripheral surface 232, it is possible to suppress the peeling of the coating layer when the fixture 1 is embedded in the alveolar bone 100. Therefore, when the fixture 1 further includes a coating layer laminated on the outer peripheral surface 232, the usefulness of the present embodiment is improved. Examples of the coating layer include, but are not limited to, a hydroxyapatite coating layer.

  Next, a fixture for a dental implant according to another embodiment of the present invention will be described in detail with reference to FIG. In FIG. 4, the same components as those in FIGS. 1 to 3 described above are denoted by the same reference numerals, and description thereof may be omitted.

  As shown in FIG. 4, the main body 2 ′ provided in the fixture 1 ′ of the present embodiment has an outer peripheral surface 232 ′ of the side wall 23 ′ located on the distal end 21 side, and It has a tapered region 232a in which the outer diameter M of the main body 2 'becomes smaller as it goes. According to such a configuration, it is possible to improve the embeddability when the fixture 1 ′ is implanted in the alveolar bone 100, and a portion where the roots of adjacent teeth are close to each other or a narrow alveolar ridge. In this case, the fixture 1 'can be easily embedded. Inclined implantation to prevent perforation in the alveolar bone wall is also facilitated. Further, in the tapered region 232a, the protruding length L of the pin tip 41 is relatively larger than that of the rear end 22, so that the intraosseous fixation of the tip 21 can be improved.

The tip portion 21 may have a curved shape or a flat shape. The tip 21 of the present embodiment has a curved surface.
Other configurations are the same as those of the fixture 1 according to the above-described embodiment, and a description thereof will not be repeated.

<Dental implant system>
Next, a dental implant system according to an embodiment of the present invention will be described in detail with reference to FIGS. 5 to 9, taking as an example a case where the fixture 1 according to the embodiment described above is provided.

  As shown in FIG. 5, the dental implant system 10 according to the present embodiment includes a fixture 1 and an extruding member 5. As shown in FIG. 5A, the pushing member 5 is inserted into a hollow portion 25 surrounded by the bottom portion 24 and the inner peripheral surface 231 of the main body portion 2 to push each of the plurality of pins 4 outward. It is a substantially rod-shaped member that is pushed out.

  In a cross-sectional view (see FIG. 7B) perpendicular to the longitudinal direction d (see FIG. 7A) of the extruding member 5, the extruding member 5 of the present embodiment has a radius D gradually along the circumferential direction e. Has an area S which is larger than the area S. The extruding member 5 of the present embodiment has two regions S, and the two regions S, S are located over a half circumference of the extruding member 5. According to these configurations, each of the plurality of pins 4 can be pushed outward as described below.

  First, as shown in FIG. 5A, the pushing member 5 is inserted into the hollow portion 25 through the opening 26 of the main body 2. Next, as shown in FIG. 6A, the pushing member 5 is rotated about its central axis X2. At this time, the extruding member 5 is rotated in a direction indicated by an arrow f in which the side having the smaller radius D in the region S is forward in the rotation direction. Thereby, as shown in FIG. 5B and FIG. 6B, each of the plurality of pins 4 can be pushed outward with the change of the radius D in the region S. In the present embodiment, as described above, since the region S is located over a half circumference of the pushing member 5, when the pushing member 5 is rotated substantially half a turn, each of the plurality of pins 4 can be pushed outward. it can. Note that the center axis X2 of the above-described pushing member 5 is an axis passing between the front end portion 51 and the rear end portion 52 of the pushing member 5 as shown in FIG. Means the axis that becomes the axis of rotation.

  As shown in FIGS. 5 and 6, in the present embodiment, when the pushing member 5 is inserted into the hollow portion 25, the center axis X2 of the pushing member 5 becomes coaxial with the center axis X1 of the main body 2. According to such a configuration, the pushing member 5 can be smoothly rotated in the hollow portion 25, and the plurality of pins 4 can be pushed uniformly.

  In the present embodiment, as shown in FIG. 1 described above, the main body 2 has a concave portion 27 located at the bottom 24 and including the central axis X1 of the main body 2. The recess 27 has a conical shape whose inner wall has a vertex P on the central axis X1 of the main body 2. According to these configurations, as shown in FIG. 5, when the tip 51 of the pushing member 5 is brought into contact with the recess 27, the tip 51 of the pushing member 5 is drawn toward the vertex P, and the center of the pushing member 5 is moved. Since the axis X2 is coaxial with the center axis X1 of the main body 2, both axes can be easily set. In the pushing member 5 of the present embodiment, the tip 51 has a conical shape that is convex forward from the viewpoint of easy centering.

  On the other hand, the dental implant system 10 of the present embodiment further includes a retraction member 6, as shown in FIG. As shown in FIG. 9, the pull-back member 6 is inserted into the hollow portion 25 of the main body 2, engages with the pin rear end 42 of each of the plurality of pins 4, and connects the pin tip 41 to the hollow portion. This member is pulled back to the 25 side. The retraction member 6 of the present embodiment has a slit 63 that sandwiches the pin rear end portion 42 (see FIG. 8B). Hereinafter, the configuration of the pullback member 6 of the present embodiment will be specifically described.

  As shown in FIG. 8A, the retraction member 6 of the present embodiment has a pair of engagement pieces 6A, 6A which are located opposite to each other. Each of the pair of engagement pieces 6A, 6A is a long plate-shaped member, and has a slit 63 extending from a front end 61 to a rear end 62 as shown in FIG. 8B. are doing. As shown in FIG. 8A, each of the pair of engagement pieces 6A, 6A is located on the rear end portion 62 side and is bent so that the interval between them is reduced. 64. The retraction member 6 further has an elastic member 65 attached near the bent portion 64. The elastic member 65 of the present embodiment is a spring-like spring, but is not limited to this. The elastic member 65 may be housed in the case 68. In the present embodiment, when no external force is applied to the elastic member 65, a gap Y1 is formed between the rear ends 62, 62 of the pair of engagement pieces 6A, 6A.

  The retraction member 6 of the present embodiment further has a cap 66. The cap 66 of the present embodiment is a substantially cylindrical member, and has a female screw portion 661 located on the inner peripheral surface thereof. Each of the pair of engagement pieces 6A, 6A further includes a male screw portion 67 which is located on the rear end portion 62 side and can be screwed to the female screw portion 661 of the cap 66. According to these configurations, the respective pin tip portions 41 of the plurality of pins 4 can be pulled back to the hollow portion 25 side as follows.

  First, as shown in FIG. 9A, the retraction member 6 is inserted into the hollow portion 25 through the opening 26 of the main body 2. At this time, the pin rear ends 42 of the plurality of pins 4 are sandwiched between the slits 63 of the pair of engagement pieces 6A, 6A. In this embodiment, the pin rear end portion 42 and the reduced diameter portion 431 of the head 43 are sandwiched. As a result, the pin tip 41 can be moved inward of the main body 2 as shown by the arrow g by the thickness of the engagement piece 6A, and a part of the pin tip 41 can be pulled back to the hollow portion 25 side. it can.

  Next, the cap 66 is moved in the direction of arrow h, and the female screw portion 661 of the cap 66 is screwed to the male screw portion 67 located at the rear end 62 of each of the pair of engagement pieces 6A. Then, as shown in FIG. 9B, the cap 66 is tightened in the direction of arrow i. Thereby, the elastic member 65 is compressed. Accordingly, the gap Y1 formed between the rear ends 62, 62 of the pair of engagement pieces 6A, 6A is reduced, and the slit 63 is located in the pair of engagement pieces 6A, 6A. The distance Y2 between the parts also decreases. As a result, the remaining portion of the pin tip 41 can be pulled back to the hollow portion 25 side, and the pin tip 41 can be in a state where it does not protrude from the outer peripheral surface 232.

  The direction in which the cap 66 is tightened is not limited to the direction of the arrow i. Further, in the present embodiment, the case where the fixture 1 is provided has been described as an example, but the same effect can be obtained when the fixture 1 ′ is provided instead of the fixture 1.

<Dental implant>
Next, a dental implant according to an embodiment of the present invention will be described in detail, taking as an example a case where the fixture 1 according to the above-described embodiment is provided.

  The dental implant of the present embodiment includes the fixture 1 described above and a structural component attached to the rear end 22 of the main body 2 of the fixture 1.

  Structural components are so-called artificial teeth, including artificial teeth made of metal, ceramic or hard resin. The artificial tooth is usually made to order and attached to the rear end 22 of the fixture 1 via the abutment 7 shown in FIG. 5 described above. The artificial tooth may be a single type or a connection type (bridge). In addition, the artificial teeth described above include artificial teeth as well as artificial teeth. Examples of the denture include so-called dentures such as partial dentures and full dentures. The denture is detachably attached to the rear end 22 of the fixture 1 via an attachment.

  Note that the abutment 7 described above is also included in the structural components of the present embodiment. The abutment 7 is a member for connecting the artificial tooth to the fixture 1, and is fixed to the fixture 1 via an abutment screw. The abutment screw may be formed as a separate member from the abutment 7, or may be formed integrally with the abutment 7. In this embodiment, the abutment screw is formed integrally with the abutment 7.

  On the other hand, the dental implant may further include the above-described extruding member 5 attached to a structural component. As shown in FIG. 7A, the dental implant according to the present embodiment further includes an extruding member 5 attached to the abutment 7.

  In the present embodiment, the extruding member 5 is formed integrally with the abutment 7. According to such a configuration, since the connection strength between the pushing member 5 and the abutment 7 is improved, the pushing member 5 can be prevented from coming off the abutment 7. In addition, the pushing member 5 can be configured as a separate member from the abutment 7 and attached to the abutment 7.

  In the present embodiment, the case where the fixture 1 is provided has been described as an example. However, similar effects can be obtained when the fixture 1 ′ is provided instead of the fixture 1.

<Dental implant implantation>
Next, a dental implant embedding operation according to an embodiment of the present invention will be described in detail, taking a case where the dental implant system 10 according to the above-described embodiment is used as an example.

  First, an insertion hole is drilled in the alveolar bone 100 of the gingiva and the jawbone by a drill or the like, and the fixture 1 is inserted. In the present embodiment, as described above, since the outer peripheral surface 232 of the fixture 1 is curved, the fixture 1 can be smoothly embedded.

  After the fixture 1 is embedded in the alveolar bone 100, the respective pin tips 41 of the plurality of pins 4 are protruded outward from the outer peripheral surface 232 to be pressed into the bone tissue, and the fixture 1 is inserted into the alveolar bone. Firmly fixed to 100. After the fixing of the fixture 1 is completed, a structural component is attached to the rear end 22 of the main body 2 to form a dental implant, and the treatment is completed. When removing the implanted fixture 1 from the alveolar bone due to an infection or the like, the pin tip 41 is pulled back to the hollow portion 25 side and then removed.

  The preferred embodiment according to the present invention has been described above, but the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be arbitrarily set without departing from the gist of the present invention.

  For example, in the above-described embodiment, the outer peripheral surface 232 of the main body 2 of the fixture 1 has a curved surface. However, the shape of the outer peripheral surface 232 is not limited to the curved surface. 232 may be formed with a thread.

  In the above-described embodiment, the configuration in which the pushing member 5 has the region S has been described as an example. However, the configuration of the pushing member 5 can push each of the plurality of pins 4 outward. The configuration is not limited to the configuration having the region S. As another configuration of the pushing member 5, for example, a tapered shape in which the diameter increases from the front end portion 51 to the rear end portion 52 of the pushing member 5 can be given.

  Further, in the above-described embodiment, the concave portion 27 located at the bottom portion 24 of the main body 2 has a conical shape. However, the concave portion 27 can be formed in another shape instead. Other shapes of the recess 27 include, for example, a female screw shape. When the concave portion 27 is formed into a female screw shape, the distal end portion 51 of the pushing member 5 may be formed into a male screw shape that can be screwed into the female screw concave portion 27.

  Further, in the above-described embodiment, the configuration in which the pull-back member 6 has the engagement piece 6A has been described as an example. However, the configuration of the pull-back member 6 is such that the pull-back member 6 is engaged with the pin rear end 42 side and the pin tip 41 Is not limited to the configuration having the engagement piece 6A as long as it can be pulled back to the hollow portion 25 side. Another configuration of the pull-back member 6 includes, for example, a configuration in which an adhesive layer is provided on the distal end side of a substantially rod-shaped member, and is engaged with the pin rear end 42 side by the adhesiveness of the adhesive layer. .

DESCRIPTION OF SYMBOLS 1 Dental implant fixture 2 Main body part 21 Front end part 22 Rear end part 23 Side wall part 231 Inner peripheral surface 232 Outer peripheral surface 24 Bottom 25 Hollow part 26 Opening 27 Depression 3 Pin insertion hole 4 Pin 41 Pin tip 42 Pin rear end Part 43 head 431 reduced diameter part 1 'fixture 2' main body part 23 'side wall part 232' outer peripheral surface 232a tapered area 10 dental implant system 5 pushing member 51 tip part 52 rear end part 6 retraction member 6A engaging piece 61 tip part 62 rear end portion 63 slit 64 bent portion 65 elastic member 66 cap 661 female screw portion 67 male screw portion 68 case 7 abutment 100 alveolar bone

Claims (9)

A substantially cylindrical body with a bottom,
A pin insertion hole penetrating between the inner peripheral surface and the outer peripheral surface of the side wall of the main body,
A pin inserted into the pin insertion hole so that a pin tip can protrude outward from the outer peripheral surface, and a fixture for a dental implant ;
A substantially rod-shaped extruding member that is inserted into a hollow portion surrounded by the bottom portion and the inner peripheral surface of the main body and extrudes the pin outward.
A retractable member that is inserted into the hollow portion, engages with the pin rear end side of the pin, and retracts the pin tip in a direction approaching the central axis of the main body, comprising:
The pin has a head connected to the rear end of the pin and having an outer diameter larger than the inner diameter of the pin insertion hole,
The head has a reduced diameter portion that is located on the pin rear end side and has a diameter reduced toward the pin rear end portion,
The dental implant system, wherein the retraction member has a slit that sandwiches the pin rear end and the reduced diameter portion . 2. The dental implant according to claim 1, wherein the dental implant fixture includes a plurality of the pin insertion holes, and the plurality of pin insertion holes are spaced apart from each other along a longitudinal direction of the main body. 3. Implant system . Fixture for the dental implant, a plurality of the pin insertion holes, said plurality of pin insertion holes along the circumferential direction of the main body portion are located at a distance from each other, according to claim 1 or 2 Dental implant system . The fixture for a dental implant includes a plurality of the pin insertion holes, and in a cross-sectional view perpendicular to a longitudinal direction of the main body, the plurality of pin insertion holes are rotationally symmetric with respect to a center axis of the main body. the a dental implant system of any of claims 1-3. The dental implant system according to any one of claims 1 to 4 , wherein the outer peripheral surface is curved. The dental implant system according to claim 5 , wherein the fixture for a dental implant further comprises a coating layer laminated on the outer peripheral surface. The outer peripheral surface, said has a tapered region whose outer diameter is smaller in the body portion toward the distal end portion located on the distal end side of the main body portion, according to any one of claims 1 to 6 Dental implant system . Wherein in a cross section perpendicular to the longitudinal direction as viewed in an extrusion member, the extrusion member has a region that radius gradually increases along the circumferential direction, the dental implant system of claim 1. Wherein when the pusher member is inserted into the hollow portion, the central axis of the extrusion member comprises a central axis coaxial with the main body portion, the dental implant system of claim 1 or 8.

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