JP2017029261A - Fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixture capable of reducing a possibility of breakage of the fixture and an internal screw by enhancing bonding force between the fixture and an abutment while suppressing reduction in rigidity of the fixture.SOLUTION: A fixture 1 constituting a part of an implant includes a fixture body 1A and an outside coupling part 1B provided outside the fixture body 1A. The outside coupling part 1B includes an engaging part 2 configured to engage with an engaging part 31 of an abutment 30. The outside coupling part 1B also includes a plurality of groove parts 4 provided on a surface of the engaging part 2 of the outside coupling part 1B. The plurality of groove parts 4 engage with a plurality of projection parts 34 provided on a surface of the engaging part 31 of the abutment 30.SELECTED DRAWING: Figure 2B

Description

  The present invention relates to a fixture fixed to an alveolar bone.

  An implant used for implant treatment includes a fixture that is fixed to an alveolar bone, an abutment that is attached to the fixture, and a prosthesis that is attached to the abutment and functions as an artificial tooth.

  Conventionally, as the fixture, there are known an external coupling type fixture and an internal coupling type fixture.

  According to the fixture of the external coupling mode, since the hollow portion of the fixture is less than that of the fixture of the internal coupling mode, the rigidity of the fixture can be increased. As a result, even if a large stress occurs in the implant, it is possible to reduce the stress concentration from the inside of the fixture toward the bone tissue around the fixture. However, there is a problem that the contact surface area between the fixture and the abutment cannot be increased because the height of the convex portion provided on the upper portion of the fixture cannot be increased due to the restriction of use in the oral cavity. As a result, since the bonding force between the fixture and the abutment is low, it is necessary to increase the diameter of the internal screw used when fastening the abutment to the fixture (for example, φ2.0 mm), and increase the fastening torque value. There is a problem that it is necessary to do this (for example, about 35 Ncm). Furthermore, since the fastening torque value is high, there is a problem that stress concentration on the internal screw is unavoidable and the risk of the internal screw breaking is increased.

  According to the fixture of the internal coupling mode, it is possible to increase the contact surface area between the fixture and the abutment by setting the position of the coupling portion to a deep position inside the fixture. Thereby, it is possible to increase the coupling force between the fixture and the abutment, and to reduce the fastening torque value of the internal screw. As a result, even if a large stress is generated in the implant, it is possible to reduce the stress concentration on the internal screw, and it is possible to reduce the possibility of the internal screw breaking. However, the fixture in the inner coupling mode has a lower hollow portion of the fixture than the fixture in the outer coupling mode, so that the rigidity of the fixture is lowered. As a result, when a large stress is generated in the implant, stress concentration from the inside of the fixture toward the bone tissue around the fixture is unavoidable, and adverse effects on the bone tissue around the fixture and the fixture breaks. There was a problem that the fear increased.

  For example, Patent Document 1 discloses a conventional external coupling type fixture and a conventional internal coupling type fixture.

JP 2004-113718 A

  In view of the problems of the conventional fixture of the external coupling mode and the fixture of the internal coupling mode, the present invention increases the coupling force between the fixture and the abutment while suppressing a decrease in the rigidity of the fixture. Thus, an object of the present invention is to provide a fixture that can reduce the risk of the fixture and internal screw breaking.

The fixture of the present invention is a fixture constituting a part of an implant,
The fixture includes a fixture main body and an external coupling portion provided outside the main body, and the external coupling portion is configured to engage with an engagement portion of an abutment attached to the fixture. A groove or a protrusion is formed on the surface of the engagement portion of the external coupling portion of the fixture, and the groove or the protrusion is formed on the surface of the engagement portion of the abutment. Configured to engage the projected protrusion or groove, thereby achieving the above object.

  In one embodiment of the present invention, the groove or the protrusion extends parallel to the longitudinal axis of the fixture.

  In one embodiment of the present invention, the engaging portion of the outer coupling portion is cylindrical, and the groove or the protrusion formed on the surface of the engaging portion of the outer coupling portion has a planar U shape. None, there are a total of six of the grooves or protrusions, and the grooves or protrusions formed on the surface of the engaging portion of the external coupling portion are on the surface of the engaging portion of the external coupling portion. They are provided approximately evenly.

  In one embodiment of the present invention, the outer coupling portion is provided on a platform surface of the fixture, and the groove portion on the surface of the engaging portion of the outer coupling portion is located below the fixture surface than the platform surface. An internal lock portion extending toward the front, and the internal lock portion is configured to engage with an external lock portion formed on the protrusion formed on the surface of the engagement portion of the abutment.

  In one embodiment of the present invention, the internal lock portion has a portion extending toward the outside of the fixture.

  The fixture of the present invention is a fixture constituting a part of an implant, and the fixture includes a fixture main body, an external coupling portion provided outside the main body, and an inner portion provided inside the main body. A coupling portion, wherein the outer coupling portion includes a first engagement portion configured to engage a first engagement portion of an abutment attached to the fixture, and the inner coupling portion includes: A second engagement portion configured to engage with the second engagement portion of the abutment is included.

  In one embodiment of the present invention, at the upper end of the engagement surface where the second engagement portion of the abutment and the second engagement portion of the fixture are engaged, the second engagement portion of the fixture is The outer periphery is longer than the outer periphery of the second engagement portion of the abutment.

  In one embodiment of the present invention, the external coupling portion is provided on a platform surface of the fixture, and the platform surface is configured so that foreign matter that enters from between the abutment and the gingiva along the platform surface. It has a shape that prevents it from moving to the bone tissue around the fixture.

  In one embodiment of the present invention, the platform surface is formed to move away from the vertical axis as it goes upwards of the fixture.

  In one embodiment of the present invention, a groove or a protrusion is formed on a surface of the first engagement portion of the external coupling portion of the fixture, and the groove or the protrusion is a first engagement portion of the abutment. It is configured to engage with a protrusion or groove formed on the surface of the joint.

  In one embodiment of the present invention, the first engagement portion of the outer coupling portion is cylindrical, and the groove or the protrusion formed on the surface of the first engagement portion of the outer coupling portion is a flat surface. It is U-shaped, and there are a total of six grooves or protrusions, and the grooves or protrusions formed on the surface of the first engaging portion of the outer coupling portion are It is provided substantially evenly on the surface of the first engaging portion.

  In one embodiment of the present invention, the second engaging portion of the inner coupling portion has an inner wall surface, and the inner wall surface is inclined so as to approach the longitudinal axis of the fixture as it goes downward of the fixture. The inclination becomes gentler toward the lower side of the fixture.

  According to the fixture of the present invention, it is possible to reduce the possibility that the fixture and the internal screw are broken by increasing the bonding force between the fixture and the abutment while suppressing the decrease in the rigidity of the fixture. Char can be provided.

The figure which shows the connection relation of the fixture 1 and the abutment 30 Front view of the fixture 1 (the upper part of the fixture 1 is an AA longitudinal sectional view of FIG. 2B) Top view of fixture 1 The figure which shows the result of having connected the point between mutually adjacent groove parts 4 and 4 among the six groove parts 4 shown by FIG. 2B. The perspective view of the part which expanded the external coupling part 1B of the fixture 1 Front view of the fixture 1 '(the upper portion of the fixture 1' is a vertical sectional view taken along line AA in FIG. 3B) Top view of fixture 1 ' Front view of fixture 1 "(upper part of fixture 1" is AA longitudinal sectional view of FIG. 4B) Top view of fixture 1 ” The figure which shows the coupling | bonding relationship of the fixture 101 and the abutment 130 AA longitudinal sectional view of the fixture 101 in FIG. 6B. Top view of fixture 101 Partial enlarged view of the vicinity of the platform surface 111 when the fixture 101 is mounted on the bone tissue 170 of the alveolar bone

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1. Structure of the fixture according to the first embodiment of the present invention The structure of the fixture 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2A to 2D.

  The fixture 1 is formed in a substantially cylindrical body. The outer diameter of the fixture 1 is, for example, about 3 mm to about 5 mm. The length of the fixture 1 in the vertical axis direction is, for example, about 10 mm to about 12 mm. The fixture 1 is configured to be coupled to the abutment 30.

  FIG. 1 shows the connection relationship between the fixture 1 and the abutment 30. Here, the upper part of FIG. 1 is a longitudinal sectional view of the abutment 30, and the lower part of FIG. 1 is a longitudinal sectional view of the fixture 1.

  As shown in FIG. 1, the fixture 1 is a fixture in an external coupling mode. The fixture 1 includes a fixture main body 1A and an external coupling portion 1B provided outside the fixture main body 1A. The external coupling portion 1 </ b> B is for coupling the fixture 1 to the abutment 30.

  A platform surface 11 of the fixture 1 and an engaging portion 2 of the fixture 1 are provided at the upper end 9 of the fixture 1A main body. The engaging portion 2 of the fixture 1 has a convex shape.

  The platform surface 11 of the fixture 1 is configured to be joined to the lower end surface 32 of the abutment 30. In FIG. 1, the joining relationship between the platform surface 11 of the fixture 1 and the lower end surface 32 of the abutment 30 is represented by a dashed arrow.

  The engaging portion 2 of the fixture 1 is configured to engage with the engaging portion 31 of the abutment 30. The engaging part 31 of the abutment 30 has a concave shape. In FIG. 1, the engagement relationship between the engagement portion 2 of the fixture 1 and the engagement portion 31 of the abutment 30 (that is, the relationship between the convex shape of the engagement portion 2 and the concave shape of the engagement portion 31). Are represented by dashed arrows.

  Six groove portions 4 are provided on the outer wall surface of the engagement portion 2 of the fixture 1. Each of these groove portions 4 is configured to be fitted to a corresponding one of the six protrusion portions 34 formed on the inner wall surface of the engagement portion 31 of the abutment 30. In FIG. 1, the fitting relationship between the groove portion 4 of the fixture 1 and the projection portion 34 of the abutment 30 is represented by a dashed arrow.

  The groove 4 of the fixture 1 extends in the longitudinal direction of the fixture 1. Of the groove portion 4 extending in the longitudinal direction of the fixture 1, a portion below the platform surface 11 is referred to as an internal lock portion 13. The internal lock portion 13 extends toward the outside of the fixture 1. The outer periphery of the internal lock portion 13 has an inclined surface. This inclined surface is gently inclined toward the inside of the fixture 1 as it goes downward of the fixture 1. The internal lock part 13 which is a part of the groove part 4 of the fixture 1 is fitted with an external lock part 35 which is a part of the protrusion part 34 of the abutment 30.

  FIG. 2A is a front view of the fixture 1. Here, the upper part of the fixture 1 is an AA longitudinal sectional view of FIG. 2B. FIG. 2B is a top view of the fixture 1.

  As shown in FIG. 2A, the fixture 1 includes a fixture body 1A and an external coupling portion 1B provided outside the fixture body 1A. External coupling portion 1 </ b> B includes an engagement portion 2 configured to engage with an engagement portion 31 of abutment 30.

  As shown in FIG. 2B, six groove portions 4 are formed substantially evenly on the outer wall surface 3 of the engaging portion 2 of the external coupling portion 1B. Each of these groove portions 4 has a planar U shape.

  FIG. 2C is a diagram illustrating a result of connecting points between adjacent groove portions 4 and 4 among the six groove portions 4 illustrated in FIG. 2B. As shown in FIG. 2C, a hexagonal star (“Star of DAVID”) appears by connecting the points between the adjacent groove portions 4 and 4 among the six groove portions 4 shown in FIG. 2B. The inventor named the engaging portion 2 having the six groove portions 4 as “David hexagram” (“DAVID hexgram”), and named the six groove portions 4 after the hexagonal star shape. The connection between the fixture 1 and the abutment 30 using the engaging portion 2 having the same is named “David connection” (“DAVID connection”).

  FIG. 2D is a perspective view of an enlarged portion of the external coupling portion 1B of the fixture 1. As shown in FIG. 2D, each of the six groove portions 4 formed on the outer wall surface 3 of the engaging portion 2 of the outer coupling portion 1 </ b> B extends in the longitudinal direction of the fixture 1.

  Referring to FIG. 2A again, a screw hole 5 (for example, φ1.6 mm) in which an internal thread is cut is provided on the upper surface of the engaging portion 2 of the fixture 1. The screw hole 5 is formed so as to extend from the upper surface of the engaging portion 2 to the inside of the fixture main body 1A.

  Furthermore, a plurality of grooves 6 and a plurality of grooves 7 are formed on the outer peripheral surface of the fixture body 1A. The plurality of grooves 6 extend in the longitudinal direction of the fixture 1 from the upper end 9 of the fixture body 1 </ b> A toward the lower end 10. The plurality of grooves 6 extend in the horizontal axis direction of the fixture 1 so as to intersect with the plurality of grooves 7.

  The cross-sectional shape of the plurality of grooves 6 and the cross-sectional shape of the plurality of grooves 7 are each V-shaped. A pyramid-shaped protrusion 8 is formed at a portion where the plurality of grooves 6 and the plurality of grooves 7 intersect.

  The shape of what is formed on the outer peripheral surface of the fixture body 1A shown in FIGS. 2A and 2B is merely an example, and the present invention is not limited to this. Various shapes can be adopted as the shape formed on the outer peripheral surface of the fixture body 1A.

  Here, the vertical direction of the fixture 1 refers to a direction extending along the longitudinal axis of the fixture 1 (that is, the vertical axis X, see FIG. 2A) (however, from the vertical axis X of the fixture 1). The direction extending so as to curve in the circumferential direction is also referred to as the vertical axis direction). The horizontal axis direction of the fixture 1 refers to a direction extending along a horizontal axis substantially orthogonal to the vertical axis X of the fixture 1. The direction approaching the vertical axis X in the horizontal axis direction of the fixture 1 is called “inside” (see FIG. 2A), and the direction away from the vertical axis X in the horizontal axis direction of the fixture 1 is “outside” (see FIG. 2A). ). Further, when the fixture 1 is inserted into the alveolar bone, the side of the fixture 1 arranged in the alveolar bone is referred to as “lower” (see FIG. 2A), and the opposite side from the lower side is referred to as “upper” (FIG. 2A).

2. Effects achieved by the fixture of the first embodiment of the present invention According to the fixture 1 of the first embodiment of the present invention, the engagement portion 2 of the fixture 1 and the engagement portion 31 of the abutment 30 are engaged. At this time, the groove portion 4 formed on the outer wall surface of the engaging portion 2 of the fixture 1 and the projection portion 34 formed on the inner wall surface of the engaging portion 31 of the abutment 30 are fitted. By fitting the groove 4 of the fixture 1 and the protrusion 34 of the abutment 30, the contact surface area between the fixture 1 and the abutment 30 can be increased as compared with the fixture of the conventional external coupling mode. Is possible. Thereby, it is possible to increase the coupling force between the fixture 1 and the abutment 30 without increasing the height of the fixture 1, and it is possible to reduce the burden of the coupling force due to the internal screw. . As a result, it is possible to reduce the screw diameter of the internal screw (for example, while the screw diameter φ of the internal screw of the conventional external coupling type fixture is 2.0 mm, the inside of the fixture 1 The screw diameter can be reduced to φ1.6 mm), and the torque value required for fastening the abutment 30 to the fixture 1 (that is, the fastening torque value) can be reduced. (For example, the fastening torque value of the fixture of the conventional external coupling mode is about 35 Ncm, whereas the fastening torque value of the fixture 1 can be reduced to about 20 Ncm to about 25 Ncm).

  Furthermore, it is possible to reduce the stress concentration on the internal screw when the fixture 1 and the abutment 30 are fastened to the extent that the bonding force between the fixture 1 and the abutment 30 can be increased. . Thereby, it is possible to reduce the possibility that the internal screw breaks.

  Furthermore, since it is possible to reduce a fastening torque value, when fastening the fixture 1 and the abutment 30, an excessive rotational force is not generated in the fixture 1. For this reason, it is possible to prevent destruction of the fixation state (so-called osseointegration) between the bone tissue and the fixture 1.

  Further, since the engaging portion 2 having the six groove portions 4 has a hexagonal star shape, even when a rotational force is generated in the abutment 30 in the vertical axis direction and the horizontal axis direction, It is possible to stably obtain the bonding force between the fixture 1 and the abutment 30 without impairing the compatibility between the fixture 1 and the abutment 30 as compared to the fixture in the external coupling mode.

  Furthermore, since the engaging part 2 having the six groove parts 4 has a hexagonal star shape, the engaging part 2 of the fixture 1 can receive stress from all directions. Thereby, it is possible to reduce the stress concentration on the internal screw, and it is possible to reduce the possibility that the internal screw is loosened or the internal screw is broken.

  Furthermore, since the screw diameter of the internal screw can be reduced (for example, the screw diameter of the internal screw can be reduced to φ1.6 mm), the thickness of the fixture 1 is increased accordingly. It is possible. As a result, the rigidity of the fixture 1 can be increased, and the adverse effects on the bone tissue around the fixture 1 and the possibility of the fixture 1 being broken can be reduced.

  Furthermore, since the internal lock portion 13 of the fixture 1 and the external lock portion 35 of the abutment 30 are fitted, the coupling force between the fixture 1 and the abutment 30 can be further increased.

  Furthermore, since the internal lock part 13 and the external lock part 35 which are parts below the platform surface 11 are fitted, even when excessive stress in the horizontal axis direction of the abutment 30 is generated in the abutment 30, It is possible to prevent the abutment 30 from floating from the platform surface 11 of the fixture 1. Thereby, it is possible to reduce the possibility of impairing the compatibility between the fixture 1 and the abutment 30.

  Furthermore, the outer periphery of the internal lock portion 13 of the fixture 1 has an inclined surface that gradually inclines toward the inside of the fixture 1 as it goes downward of the fixture 1. Thereby, it is possible to facilitate the fitting between the internal lock portion 13 of the fixture 1 and the external lock portion 35 of the abutment 30.

  Furthermore, since the fixture 1 is a fixture having an external coupling mode, the hollow portion is less than that of a conventional fixture having an internal coupling mode, and the rigidity of the fixture 1 can be increased. Thereby, it is possible to reduce the possibility that the fixture 1 is broken.

3. The structure of the fixture 1 described above with reference to the alternative structural drawing of the fixture according to the first embodiment of the present invention is merely an example. The structure of the fixture 1 of the present invention is not limited to the structure of the fixture described above with reference to the drawings. As long as the bonding force between the fixture 1 and the abutment 30 can be increased, it is possible to employ the fixture 1 having various structures.

(Modification of Embodiment 1 of the present invention)
With reference to FIG. 3A and FIG. 3B, the structure of fixture 1 'of the modification of Embodiment 1 of this invention is demonstrated.

  FIG. 3A is a front view of the fixture 1 ′. Here, the upper part of the fixture 1 ′ is an AA longitudinal sectional view of FIG. 3B. FIG. 3B is a top view of the fixture 1 ′.

  The structure of the fixture 1 ′ shown in FIGS. 3A and 3B is the same as that of the fixture 1 shown in FIGS. 2A and 2B, except that the groove 4 ′ of the fixture 1 ′ does not have the internal lock portion 13. The structure is the same. The same reference numerals are given to the same components as those shown in FIGS. 2A and 2B, and the description thereof is omitted.

  According to the fixture 1 ′ shown in FIGS. 3A and 3B, the effect achieved by providing the internal lock portion 13 (that is, the internal lock portion 13 of the fixture 1 and the external lock portion 35 of the abutment 30 are This is achieved by the fixture 1 shown in FIGS. 2A and 2B except for the effect that the abutment 30 can be prevented from floating from the platform surface 11 of the fixture 1 by fitting. An effect similar to the effect can be achieved.

  Furthermore, the fixture 1 ′ is easy to process because the internal lock portion 13 is not provided, and the manufacturing cost can be reduced. In particular, the fixture 1 ′ not provided with the internal lock portion 13 is useful for a small-diameter fixture in which there is a risk of lowering the rigidity by providing the internal lock portion 13.

(Other variations of Embodiment 1 of the present invention)
With reference to FIG. 4A and FIG. 4B, the structure of the fixture 1 '' of the other modification of Embodiment 1 of this invention is demonstrated.

  4A is a front view of the fixture 1 ″. Here, the upper portion of the fixture 1 ″ is a vertical sectional view taken along line AA of FIG. 4B. FIG. 4B is a top view of the fixture 1 ″.

  In the structure of the fixture 1 ″ shown in FIGS. 4A and 4B, the groove portion 4 ″ of the fixture 1 ″ has the internal lock portion 13 ″, but the internal lock portion 13 ″ is outside the fixture 1 ″. The structure is the same as that of the fixture 1 shown in FIG. 2A and FIG. The same reference numerals are given to the same components as those shown in FIGS. 2A and 2B, and the description thereof is omitted.

  According to the fixture 1 ″ shown in FIGS. 4A and 4B, the coupling force between the fixture 1 ″ and the abutment is increased by fitting the groove 4 ″ of the fixture 1 ″ and the protrusion of the abutment. 2A and 2B is smaller than the effect of increasing the coupling force between the fixture 1 and the abutment by fitting the groove 4 of the fixture 1 and the projection of the abutment shown in FIGS. Except for this, it is possible to achieve the same effect as that achieved by the fixture 1 shown in FIGS. 2A and 2B.

(Other alternative structures)
The shape of the engaging portion 2 of the fixture 1 is not limited to the shape described above with reference to the drawings. As long as the bonding force between the fixture 1 and the abutment 30 can be increased, it is possible to employ the engaging portions 2 having various shapes (for example, a cylindrical shape or a polygonal column shape). .

The structure of the groove part 4 formed in the outer wall surface of the engaging part 2 of the fixture 1 is not limited to the structure described above with reference to the drawings. As long as the bonding force between the fixture 1 and the abutment 30 can be increased, various configurations (for example, the number of grooves, the shape of the grooves, the interval between the grooves, the width of the grooves, the depth of the grooves, etc. are arbitrary) It is possible to adopt the groove portion 4 having a value of
For example, the number of the groove parts 4 is not limited to six. The number of the groove portions 4 may be an arbitrary number of 1 or more. For example, the shape of the groove part 4 is not limited to a planar U-shape. The shape of the groove 4 can be any shape. For example, the interval between the groove portions 4 is not limited to be substantially equal. The interval between the groove portions 4 may be an arbitrary interval. Further, instead of forming the groove portion 4 in the outer wall surface 3 of the engagement portion 2 of the fixture 1, a surface other than the outer wall surface 3 of the engagement portion 2 of the fixture 1 (for example, the engagement portion 2 of the fixture 1). You may make it form the groove part 4 in an upper surface. Alternatively, instead of forming the groove portion 4 on the surface of the engaging portion 2 of the fixture 1 (the outer wall surface 3 or a surface other than the outer wall surface 3), the surface of the engaging portion 2 of the fixture 1 (the outer wall surface 3 or the outer wall surface). Projections may be formed on the surface other than 3. In this case, the coupling force between the fixture 1 and the abutment 30 can be increased by fitting the protrusion of the fixture 1 and the groove of the abutment 30. As long as the bonding force between the fixture 1 and the abutment 30 can be increased, various configurations (for example, the number of protrusions, the shape of the protrusions, the interval between the protrusions, the width of the protrusions, the width of the protrusions, It is possible to employ a protrusion having a structure in which the depth is an arbitrary value. For example, the number of protrusions is not limited to six. The number of protrusions can be any number greater than or equal to one. For example, the intervals between the protrusions are not limited to be substantially equal. The interval between the protrusions can be any interval.

  Each of the plurality of grooves 4 need not have the internal lock portion 13. At least one of the plurality of groove portions 4 may have an internal lock portion 13.

  The configuration of the plurality of grooves 6 formed on the outer peripheral surface of the fixture 1 and extending in the vertical axis direction (groove cross-sectional shape, groove interval, groove width, groove depth, etc.) has been described above with reference to the drawings. It is not limited to the configuration. The configuration of the plurality of grooves 7 extending in the horizontal axis direction formed on the outer peripheral surface of the fixture 1 (groove cross-sectional shape, groove interval, groove width, groove depth, etc.) is also described above with reference to the drawings. It is not limited to the configuration.

  Further, a plurality of protrusions formed at the intersection of the plurality of grooves 6 and the plurality of grooves 7 according to the configuration of the plurality of grooves 6 extending in the vertical axis direction and the configuration of the plurality of grooves 7 extending in the horizontal axis direction. The configuration of 8 can also vary. The shape of each of the plurality of protrusions 8 is not limited to the pyramid shape. Each of the plurality of protrusions 8 may have various shapes (for example, a quadrangular prism, a triangular prism, a semi-cylinder, and the like). Each of the heights of the plurality of protrusions 8 may be the same height or different heights. Furthermore, it is not necessary to form the plurality of grooves 6 extending in the vertical axis direction and the plurality of grooves 7 extending in the horizontal axis direction on the outer peripheral surface of the fixture 1. Only one of the plurality of grooves 7 extending in the axial direction may be formed.

4). Structure of fixture according to embodiment 2 of the present invention The structure of the fixture 101 according to embodiment 2 of the present invention will be described with reference to FIGS. 5, 6 </ b> A, and 6 </ b> B. Fixture 101 is configured to be coupled to abutment 130.

  FIG. 5 shows the connection relationship between the fixture 101 and the abutment 130. Here, the upper part of FIG. 5 is a longitudinal sectional view of the abutment 130, and the lower part of FIG. 5 is a longitudinal sectional view of the fixture 101.

  As shown in FIG. 5, the fixture 101 is an internal-external coupling mode fixture having both internal and external coupling mode configurations. The fixture 101 includes a fixture main body 101 </ b> A and a coupling portion 101 </ b> B for coupling to the abutment 130. The coupling portion 101B includes an external coupling portion 150 provided outside the fixture body 101A and an internal coupling portion 151 provided inside the fixture body 101A. The outer coupling 150 and the inner coupling portion 151 are for coupling the fixture 101 to the abutment 130.

  A platform surface 111 of the fixture 101 and an engaging portion 114 of the fixture 101 are provided on the upper end portion 108 of the fixture 101A main body. The engaging portion 114 of the fixture 101 has a concave shape.

  The engaging portion 102 of the fixture 101 is configured to engage with the engaging portion 131 of the abutment 130. The engaging part 131 of the abutment 130 has a concave shape. In FIG. 5, the engagement relationship between the engagement portion 102 of the fixture 101 and the engagement portion 131 of the abutment 130 (that is, the relationship between the convex shape of the engagement portion 102 and the concave shape of the engagement portion 131). Are represented by dashed arrows.

  Six groove portions 104 are provided on the outer wall surface of the engagement portion 102 of the fixture 101. Each of these groove portions 104 is configured to be fitted to a corresponding one of the six protrusions 134 formed on the inner wall surface of the engagement portion 131 of the abutment 130. In FIG. 5, the fitting relationship between the groove portion 104 of the fixture 101 and the projection portion 134 of the abutment 130 is represented by a dashed arrow.

  The groove portion 104 of the fixture 101 extends in the vertical axis direction of the fixture 101. Of the groove portion 104 extending in the vertical axis direction of the fixture 101, a portion below the bottom surface 115 of the engagement portion 114 is referred to as an internal lock portion 113. The internal lock part 113 extends toward the outside of the fixture 101. The outer periphery of the internal lock part 113 has an inclined surface. This inclined surface is gently inclined toward the inside of the fixture 101 as it goes downward of the fixture 101. The internal lock portion 113 which is a part of the groove portion 104 of the fixture 101 is fitted with an external lock portion 137 which is a part of the projection portion 134 of the abutment 130.

  The engaging portion 114 of the fixture 101 is configured to engage with the engaging portion 135 of the abutment 130. The engaging part 135 of the abutment 130 has a convex shape. In FIG. 5, the engagement relationship between the engagement portion 114 of the fixture 101 and the engagement portion 135 of the abutment 130 (that is, the relationship between the concave shape of the engagement portion 114 and the convex shape of the engagement portion 135). Are represented by dashed arrows.

  The inner wall surface 116 of the engaging portion 114 of the fixture 101 is configured to engage with the outer wall surface 136 of the engaging portion 135 of the abutment 130. The bottom surface 115 of the engaging portion 114 of the fixture 101 is configured to be joined to the lower end surface 132 of the abutment 130. In FIG. 5, the engagement relationship between the inner wall surface 116 of the engagement portion 114 of the fixture 1 and the outer wall surface 136 of the engagement portion 135 of the abutment 130 and the bottom surface 115 of the engagement portion 114 of the fixture 101 and the abutment 130. The joining relationship with the lower end surface 132 is represented by a dashed arrow.

  6A is a vertical cross-sectional view taken along the line AA of FIG. 6B as viewed from the front of the fixture 101. FIG. 6B is a top view of the fixture 101.

  As shown in FIG. 6A, the fixture 101 includes a fixture body 101 </ b> A and a coupling portion 101 </ b> B for coupling to the abutment 130. The coupling portion 101B includes an external coupling portion 150 provided outside the fixture body 101A and an internal coupling portion 151 provided inside the fixture body 101A. External coupling portion 150 includes an engagement portion 102 configured to engage with engagement portion 31 of abutment 30. Internal coupling portion 151 includes an engagement portion 114 configured to engage with engagement portion 135 of abutment 30. The engaging part 102 has a convex shape. The engaging part 114 has a concave shape. The engaging portion 102 having a convex shape is disposed at the center of the bottom surface 115 of the engaging portion 114 having a concave shape.

  As shown in FIG. 6B, six groove portions 104 are formed substantially uniformly on the outer wall surface 103 of the engaging portion 102 of the external coupling portion 150. Each of these groove portions 104 has a planar U shape. The shape of the groove 104 shown in FIG. 6B is the same as the shape of the groove 4 shown in FIG. 2B.

5. Effect Achieved by Fixture of Embodiment 2 of the Present Invention According to the fixture 101 of Embodiment 2 of the present invention, the same effect as that achieved by the fixture 1 shown in FIGS. 2A and 2B is achieved. Is possible.

  Furthermore, according to the fixture 101 of Embodiment 2 of the present invention, in addition to the engagement (external coupling) between the engagement portion 102 of the fixture 101 and the engagement portion 131 of the abutment 130, the engagement of the fixture 101 The fixture 101 and the abutment 130 are coupled by the engagement (internal coupling) between the joining portion 114 and the engaging portion 135 of the abutment 130. Thereby, compared with the fixture 1 shown by FIG. 2A and FIG. 2B, it is possible to increase the contact surface area of the fixture 101 and the abutment 130. FIG. Thereby, the coupling force between the fixture 101 and the abutment 130 can be increased, and the burden of the coupling force by the internal screw can be reduced. As a result, the screw diameter of the internal screw can be reduced (for example, the screw diameter of the internal screw can be reduced to φ1.4 mm), and the abutment 130 is fastened to the fixture 101. The required torque value (i.e., the fastening torque value) can be reduced (e.g., the fastening torque value of the fixture 101 can be reduced to about 15 Ncm to about 20 Ncm).

  Furthermore, since the bonding force between the fixture 101 and the abutment 130 can be increased, the stress concentration on the internal screw when the fixture 101 and the abutment 130 are fastened can be reduced. . Thereby, it is possible to reduce the possibility that the internal screw breaks.

  Furthermore, since the fastening torque value can be reduced, an excessive rotational force is not generated in the fixture 101 when the fixture 101 and the abutment 130 are fastened. For this reason, it is possible to prevent destruction of the fixation state (so-called osseointegration) between the bone tissue and the fixture 101.

  Furthermore, according to the fixture 101 of the second embodiment of the present invention, the inner wall surface 116 of the engaging portion 114 of the fixture 101 and the outer wall surface 136 of the engaging portion 135 of the abutment 130 are engaged. Thereby, even when a large stress in the horizontal axis direction is generated in the abutment 130, the stress in the horizontal axis direction can be absorbed by the inner wall surface 116 of the engaging portion 114 of the fixture 101. As a result, it is possible to relieve the stress in the horizontal axis direction that the internal screw receives, and it is possible to reduce the risk of the internal screw breaking.

  Furthermore, according to the fixture 101 of the second embodiment of the present invention, the position of the bottom surface 115 of the engaging portion 114 of the fixture 101 is set to the position of the bottom surface of the concave engaging portion of the fixture of the conventional internal coupling mode. Compared to the upper part. As a result, the hollow portion of the fixture 101 can be greatly reduced as compared with the fixture of the conventional internal coupling mode. As a result, it is possible to greatly suppress the decrease in the rigidity of the fixture 101 as compared with the fixture of the conventional internal coupling mode. As a result, even when a large stress is generated on the fixture 101, it is possible to reduce the possibility of the fixture 101 breaking.

  Furthermore, according to the fixture 101 of Embodiment 2 of the present invention, it is possible to prevent foreign matters such as dirt and bacteria in the oral cavity from entering the periphery of the fixture 101. Thereby, it is possible to prevent bone resorption of bone tissue caused by foreign matters such as dirt in the mouth and bacteria entering the periphery of the fixture 101.

  Hereinafter, with reference to FIG. 7, according to the fixture 101 of the second embodiment of the present invention, how foreign substances such as dirt and bacteria in the oral cavity are prevented from entering the periphery of the fixture 101. Explain what is possible.

  FIG. 7 shows a partially enlarged view of the vicinity of the platform surface 111 when the fixture 101 according to the second embodiment of the present invention is attached to the bone tissue 170 of the alveolar bone.

  As shown in FIG. 7, a platform surface 111 is provided at the upper end of the fixture body 101. The platform surface 111 has an outer bevel portion 117 that inclines toward the lower side of the fixture 101 toward the outside of the fixture 101, and an inner side that inclines toward the lower side of the fixture 101 toward the inside of the fixture 101. A bevel portion 118 is formed.

  It is desirable that the lower end of the outer bevel portion 117 and the bone interface 171 of the bone tissue 170 are in contact with each other. The lower end of the inner bevel portion 118 is in contact with the upper end of the inner wall surface 116 of the fixture 101.

  The inner wall surface 116 of the engaging portion 114 of the fixture 101 and the outer wall surface 136 of the engaging portion 135 of the abutment 130 are engaged. Gingiva 160 is laminated on top of platform surface 111. The gingiva 160 is in contact with the outer wall surface 136 of the abutment 130.

  At the upper end 119 of the engagement surface where the inner wall surface 116 of the engagement portion 114 of the fixture 101 and the outer wall surface 136 of the engagement portion 135 of the abutment 130 are engaged, the outer periphery of the fixture 101 is the abutment 130. It is longer than the outer circumference. Thereby, a switching platform can be realized. In other words, foreign matter 180 such as dirt or bacteria in the oral cavity is engaged with the fixture 101 and the abutment 130 along the outer wall surface 136 of the abutment 130 from between the abutment 130 and the gingiva 160. Even if it enters the upper end 119 of the surface, the upper end 119 of the engagement surface where the outer wall surface 136 of the abutment 101 and the inner wall surface 116 of the fixture 101 are engaged with the bone interface 171 of the bone tissue 170 Since the distance is long, it is possible to prevent foreign substances from moving to the bone interface 171 of the bone tissue 170. Thereby, it is possible to suppress the bone resorption of the bone tissue 170 due to the intrusion of the foreign matter 180. As a result, it is possible to stably obtain the fixing strength between the fixture 101 and the bone tissue 170 as compared with the fixture of the conventional external coupling mode.

  Furthermore, since the inner bevel portion 118 is provided on the platform surface 111, it is possible to prevent the foreign matter 180 from moving along the platform surface 111 to the bone interface 171 of the bone tissue 170. Thereby, the bone resorption of the bone tissue 170 can be further suppressed. As a result, it is possible to more stably obtain the fixing strength between the fixture 101 and the bone tissue 170 as compared with the fixture of the conventional external coupling mode.

6). The structure of the fixture 101 described above with reference to the alternative structural drawing of the fixture according to the second embodiment of the present invention is merely an example. The structure of the fixture 101 of the present invention is not limited to the structure of the fixture described above with reference to the drawings. As long as the bonding force between the fixture 101 and the abutment 130 can be increased, various shapes of the fixture 101 can be employed.

  In the fixture 101 according to the second embodiment of the present invention, it is possible to adopt the alternative structure described above for the fixture 1 according to the first embodiment of the present invention.

  Furthermore, the inner wall surface 116 of the engaging portion 114 of the fixture 101 may be a surface parallel to the vertical axis X. As a result, the manufacture of the fixture 101 is simplified and the cost can be reduced.

  Furthermore, the shape of the platform surface 111 may vary as long as the foreign material 180 entering between the abutment 130 and the gingiva 160 is prevented from moving to the bone tissue 170 along the platform surface 111. It is possible to adopt a platform surface 111 having a simple shape (for example, a shape such as a U shape, a V shape, a semicircular arc shape, or a shape such as an inverted U shape, an inverted V shape, a semicircular arc shape). is there. In particular, the platform surface 111 is preferably inclined toward the outside of the fixture 101 as it goes upward of the fixture 101. Accordingly, when the foreign matter 180 moves along the platform surface 111, the foreign matter 180 needs to move against gravity. As a result, it is possible to further suppress the foreign matter 180 from moving to the bone tissue 170.

  As mentioned above, although this invention has been illustrated using preferable embodiment of this invention, this invention should not be limited and limited to this embodiment. It is understood that the scope of the present invention should be construed only by the claims. It is understood that those skilled in the art can implement an equivalent range based on the description of the present invention and the common general technical knowledge from the description of specific preferred embodiments of the present invention.

  The present invention provides a fixture capable of reducing the risk of fracture of the fixture and the internal screw by increasing the bonding force between the fixture and the abutment while suppressing a decrease in the rigidity of the fixture. Useful as.

DESCRIPTION OF SYMBOLS 1 Fixture 1A Fixture main body 1B External coupling part 2 Engagement part 3 Outer wall surface 4 Groove part 5 Screw hole 13 Internal lock part

Claims (12)

A fixture that forms part of an implant,
The fixture includes a fixture body and an external coupling portion provided outside the body,
The external coupling portion includes an engagement portion configured to engage with an engagement portion of an abutment attached to the fixture,
A groove or a protrusion is formed on the surface of the engaging portion of the external coupling portion of the fixture,
The fixture, wherein the groove or the protrusion is configured to engage with a protrusion or a groove formed on the surface of the engagement portion of the abutment.   The fixture according to claim 1, wherein the groove or the protrusion extends parallel to a longitudinal axis of the fixture. The engaging part of the external coupling part is cylindrical,
The groove part or the protrusion part formed on the surface of the engaging part of the external coupling part has a plane U shape, the groove part or the protrusion part is a total of six, and
The fixture according to claim 2, wherein the groove or the protrusion formed on the surface of the engaging portion of the external coupling portion is provided substantially evenly on the surface of the engaging portion of the external coupling portion. The external coupling part is provided on a platform surface of the fixture,
The groove portion on the surface of the engaging portion of the outer coupling portion includes an inner lock portion that extends downward from the platform surface toward the fixture,
4. The internal lock portion according to claim 1, wherein the internal lock portion is configured to engage with an external lock portion formed on the projection formed on a surface of the engagement portion of the abutment. 5. Fixtures.   The fixture according to claim 4, wherein the internal lock portion has a portion extending toward the outside of the fixture. A fixture that forms part of an implant,
The fixture includes a fixture main body, an external coupling portion provided outside the main body, and an internal coupling portion provided inside the main body.
The external coupling portion includes a first engagement portion configured to engage with a first engagement portion of an abutment attached to the fixture,
The fixture includes a second engagement portion configured to engage a second engagement portion of the abutment.   At the upper end of the engagement surface where the second engagement portion of the abutment and the second engagement portion of the fixture are engaged, the outer periphery of the second engagement portion of the fixture is the second of the abutment. The fixture according to claim 6, which is longer than an outer periphery of the engaging portion. The external coupling part is provided on a platform surface of the fixture,
The fixture according to claim 7, wherein the platform surface has a shape that prevents foreign matter entering from between the abutment and the gingiva from moving along the platform surface to bone tissue around the fixture.   The fixture according to claim 8, wherein the platform surface is formed to move away from the vertical axis as it goes upward of the fixture.   A groove or a protrusion is formed on the surface of the first engagement portion of the external coupling portion of the fixture, and the groove or the protrusion is a protrusion formed on the surface of the first engagement portion of the abutment. The fixture according to any one of claims 6 to 9, wherein the fixture is configured to be engaged with a portion or a groove portion. The first engagement portion of the external coupling portion is cylindrical.
The groove or the protrusion formed on the surface of the first engagement portion of the external coupling portion has a planar U shape, and the groove or the protrusion is six in total, and
11. The groove or the protrusion formed on the surface of the first engagement portion of the external coupling portion is provided substantially evenly on the surface of the first engagement portion of the external coupling portion. Fixtures. A second engagement portion of the internal coupling portion has an inner wall surface;
The inner wall surface is inclined so as to approach the longitudinal axis of the fixture as it goes downward of the fixture, and the inclination becomes gentler as it goes downward of the fixture. Fixture according to item.

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