JP2017038701A - Impression coping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impression coping capable of highly accurately reproducing a position of a fixture buried in an oral cavity, on a model.SOLUTION: In dental implant treatment using a fixture in which an abutment hole for fixedly supporting an abutment by a tapered hole part is formed, the impression coping that is inserted into the abutment hole of the fixture buried in the oral cavity when acquiring an impression and transfers a fitting position of the fixture to the impression, includes a joining surface that comes into planar contact with a seating face formed on the abutment hole.SELECTED DRAWING: Figure 3

Description

  The present invention relates to impression coping.

  In the dental implant treatment, the fixture and the abutment are connected by, for example, a butt joint that abuts the planes formed with each other. In the butt joint, a gap is formed between the fixture and the abutment due to the shape error of the joint part such as the fixture support hole, and the joint may become unstable so that the abutment may wobble with respect to the fixture. There is sex.

  When the abutment is joined to the fixture so as to sway, the abutment may swing when the prosthesis is bitten, and bacteria may enter the fixture and cause inflammation or bone resorption.

  Therefore, a tapered joint has been proposed in which the abutment and fixture are joined by inserting the truncated conical insertion portion of the abutment into a tapered hole formed in the fixture (for example, a patent) Reference 1). According to the taper joint, the wobbling of the abutment due to the shape error is suppressed.

Japanese Patent No. 4362375

  For example, the preparation of the prosthesis and the placement in the oral cavity in the dental implant treatment are performed as follows. First, an impression is obtained with an impression coping imitating an abutment attached to a fixture embedded in the oral cavity, and an impression obtained by transferring the fixture attachment position is obtained. By attaching a fixture analog having an abutment hole similar to the fixture to the impression obtained in this way, and producing a plaster model, the oral cavity in which the fixture is embedded can be reproduced. Next, a prosthesis is produced on the model, and the prosthesis produced together with the abutment is attached to a fixture that is actually embedded in the oral cavity.

  Here, by using a joint between the fixture and the abutment as a taper joint, wobbling of the abutment and the prosthesis attached to the fixture can be suppressed as described above. However, in the taper joint, in the state where the attachment (abutment or impression coping) is attached to the fixture, the error in the height direction of the attachment due to the shape error tends to be larger than that of the butt joint.

  In a configuration in which the fixture and the abutment are joined by a taper joint in order to reduce the wobbling of the abutment, it is assumed that the fixture and the impression coping are similarly joined by a taper joint. In this case, the error of the fixture mounting position reproduced on the model by the impression coping is added to the height error of the abutment attached to the fixture. Thus, when a prosthesis is produced on a model that includes an error in the fixture attachment position, various problems may occur due to an increase in the error in the position of mounting the prosthesis.

  This invention is made | formed in view of the above, Comprising: It aims at providing the impression coping which can reproduce the fixture position embed | buried in the oral cavity on a model with high precision.

  According to one aspect of the present invention, in a dental implant treatment using a fixture in which an abutment hole for fixing and supporting an abutment with a tapered hole portion is used, when the impression is taken, the implant is embedded in the oral cavity. An impression coping that is inserted into the abutment hole of the fixture and transfers the mounting position of the fixture to the impression, and has a joint surface that makes surface contact with a seating surface formed in the abutment hole.

  According to the embodiment of the present invention, an impression coping that can accurately reproduce a fixture position embedded in the oral cavity on a model is provided.

It is a figure which illustrates the fixture in embodiment. It is sectional drawing which illustrates the fixture in embodiment. It is a figure which illustrates the impression coping in embodiment. It is sectional drawing which illustrates the impression coping in embodiment. It is a figure which illustrates the abutment in an embodiment. It is sectional drawing which illustrates the abutment in embodiment. It is a figure explaining the process from the acquisition of the impression in embodiment to preparation of a prosthesis.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted. Hereinafter, fixtures, impression copings, abutments, and treatment methods using these used for implant treatment in the embodiment will be described.

(Fixture)
First, the fixture 100 used for implant treatment in the embodiment will be described. The fixture 100 is embedded in the oral cavity instead of the lost tooth root.

  FIG. 1 is a diagram illustrating a fixture 100 in the embodiment. FIG. 2 is a cross-sectional view taken along line AA in FIG.

  As shown in FIGS. 1 and 2, the fixture 100 is formed in a columnar shape, and includes a head portion 110, a main body portion 130, and an abutment hole 150.

  The main body portion 130 has a self-tapping male screw portion formed on the outer peripheral surface. Further, the main body 130 has grooves 131 formed at four locations around the lower end in FIG. The fixture 100 is embedded in the alveolar bone from the lower end side of the main body 130 in FIG. 1, and is fixed to the alveolar bone by a male screw portion formed in the main body 130.

  As shown in FIG. 2, the abutment hole 150 has an opening at the upper end surface of the head 110 and is formed along the central axis C of the fixture 100. The abutment hole 150 includes a tapered hole portion 151, a fixing portion 152, a seating surface 153, an insertion portion 154, and a fixing screw portion 155.

  The tapered hole portion 151 is formed so that the inner peripheral surface is inclined with respect to the central axis C and the diameter gradually decreases from the head portion 110 toward the main body portion 130.

  As shown in FIG. 1A, the fixing portion 152 is formed in a hexagonal shape when viewed from above. The fixing portion 152 is fitted to the end portion of the abutment inserted into the abutment hole 150 and prevents the abutment from rotating. In addition, the fixing | fixed part 152 should just be able to prevent rotation of an abutment, and is not restricted to the shape illustrated in this embodiment.

  The seat surface 153 is a step formed between the fixed portion 152 and the insertion portion 154 and is a plane orthogonal to the central axis C. The seating surface 153 comes into surface contact with a joint surface provided at an end portion of the impression coping described later, and fixes the impression coping in an axial direction parallel to the central axis C.

  The insertion portion 154 has a circular shape whose diameter is smaller than the longest diagonal line of the polygonal fixing portion 152, and forms a seating surface 153 between the insertion portion 154 and the fixing portion 152. A fixing screw for fixing the abutment inserted into the abutment hole 150 to the fixture 100 is inserted into the insertion portion 154.

  The fixing screw portion 155 has a female screw formed on the peripheral surface thereof to be engaged with a fixing screw that fixes the abutment to the fixture 100. The abutment inserted into the abutment hole 150 of the fixture 100 is fixed to the fixture 100 by a fixing screw that is screwed into the fixing screw portion 155.

(Impression coping)
Next, the impression coping 200 in the embodiment will be described. The impression coping 200 is inserted into the abutment hole 150 of the fixture 100 embedded in the oral cavity when an impression is taken, and the mounting position of the fixture 100 is transferred to the impression.

  FIG. 3 is a diagram illustrating an impression coping 200 in the embodiment. FIG. 4 is a cross-sectional view illustrating an impression coping 200 in the embodiment. 4A is a cross-sectional view taken along the line BB in FIG. FIG. 4B is a cross-sectional view taken along the line C-C in FIG.

  As shown in FIGS. 3 and 4, the impression coping 200 includes a column part 210, a taper insertion part 230, a joint part 250, a counterbore hole 271, and a screw hole 272.

  The column part 210 has the protrusion part 211 which protrudes from an outer peripheral surface. The protruding portions 211 protrude in four directions from the outer peripheral surface of the column portion 210, and are provided in four stages in the vertical direction in FIGS. In addition, the shape, the number, and the like of the protruding portions 211 are not limited to the configuration exemplified in this embodiment.

  The tapered insertion portion 230 is formed such that the outer peripheral surface is inclined with respect to the axial direction (the vertical direction in FIGS. 3 and 4), and the diameter gradually decreases from the column portion 210 toward the joint portion 250. Further, the taper insertion part 230 is formed along the inner peripheral surface of the taper hole 151 formed in the abutment hole 150 of the fixture 100.

  The joint portion 250 has a hexagonal columnar shape, and is fitted to a fixing portion 152 provided in the abutment hole 150 of the fixture 100. The joint portion 250 is fitted to the fixed portion 152 of the abutment hole 150 to prevent the impression coping 200 inserted into the abutment hole 150 of the fixture 100 from rotating.

  Further, in the joint portion 250, the joint surface 251 comes into surface contact with the seat surface 153 of the abutment hole 150 in a state where the impression coping 200 is inserted into the abutment hole 150 of the fixture 100. The impression coping 200 is inserted into the abutment hole 150 of the fixture 100, and the joint surface 251 of the joint portion 250 and the seating surface 153 of the abutment hole 150 are in surface contact with each other so that the impression coping 200 is positioned in the axial direction of the fixture 100. The

  The tapered insertion portion 230 is formed so as not to be joined to the tapered hole portion 151 of the abutment hole 150 in a state where the impression coping 200 is inserted into the abutment hole 150 of the fixture 100. Therefore, the impression coping 200 is not a taper joint where the taper insertion portion 230 and the taper hole portion 151 are joined, but a butt joint where the joint surface 251 of the joint portion 250 and the seating surface 153 of the abutment hole 150 are in surface contact, The fixture 100 is positioned in the axial direction (height direction).

  As described above, the impression coping 200 is positioned on the fixture 100 by the butt joint, so that an error in the height direction of the attachment position of the impression coping 200 to the fixture 100 due to a shape error or the like is reduced.

  The tapered insertion portion 230 of the impression coping 200 is formed in a truncated cone shape so as to fit into the tapered hole portion 151 of the abutment hole 150, but may have a different shape such as a cylinder or a polygonal column. Good. However, by making the taper insertion portion 230 the same shape as the taper hole portion 151 of the abutment hole 150, it is possible to suppress the occurrence of mistakes such as inserting the impression coping 200 into a different fixture.

  The counterbore hole 271 and the screw hole 272 are formed to communicate with each other and penetrate the impression coping 200. The impression coping 200 can be fixed to the fixture 100 by inserting a fixing screw into the counterbore 271 and the screw hole 272 and screwing the end of the fixing screw into the fixing screw portion 155 of the abutment hole 150.

(Abutment)
Next, the abutment 300 in the embodiment will be described. The abutment 300 is inserted into the abutment hole 150 of the fixture 100 embedded in the oral cavity, and is fixed to the fixture 100 together with the prosthesis provided on the upper part.

  FIG. 5 is a diagram illustrating an abutment 300 in the embodiment. 6 is a cross-sectional view taken along the line DD of FIG.

  As shown in FIGS. 5 and 6, the abutment 300 includes a prosthesis fixing part 310, a taper fixing part 330, a fitting part 350, a counterbore hole 371, and a screw hole 372.

  The prosthesis fixing part 310 has a truncated cone shape with a smaller diameter toward the upper side in FIGS. 5 and 6, and the prosthesis is fixed.

  The taper fixing part 330 is provided between the prosthesis fixing part 310 and the fitting part 350, and has a truncated cone shape with a smaller diameter toward the lower side in FIGS. The taper fixing part 330 is inserted into the abutment hole 150 of the fixture 100 and joined to the taper hole part 151.

  When the taper fixing portion 330 is inserted into the taper hole portion 151, the abutment 300 is predetermined with respect to the fixture 100 by a taper joint in which the outer peripheral surface of the taper fixing portion 330 and the inner peripheral surface of the taper hole portion 151 abut. Is positioned at the height of

  As described above, the abutment 300 is positioned in the height direction with respect to the fixture 100 by the taper joint in which the taper fixing portion 330 and the taper hole portion 151 abut. Since the abutment 300 is positioned on the fixture 100 by the taper joint, wobbling of the abutment 300 in the lateral direction perpendicular to the axial direction of the fixture 100 is prevented. Therefore, after the abutment 300 and the prosthesis are attached to the fixture 100, it is possible to suppress the occurrence of inflammation, bone resorption, and the like due to the abutment 300 swinging with the biting force.

  The fitting part 350 has a hexagonal columnar shape that fits into the fixing part 152 provided in the abutment hole 150 of the fixture 100. The abutment 300 is inserted into the abutment hole 150 of the fixture 100, and the fitting portion 350 is fitted into the fixing portion 152 of the abutment hole 150, thereby preventing rotation after attachment.

  The counterbore hole 371 and the screw hole 372 are formed to communicate with each other and pass through the abutment 300, and a fixing screw for fixing the abutment 300 to the fixture 100 is inserted. The abutment 300 is fixed to the fixture 100 by a fixing screw inserted into the counterbore hole 371 and the screw hole 372 being screwed into the fixing screw portion 155 of the abutment hole 150.

(Impression acquisition and prosthesis production)
Next, a process from taking an impression in implant treatment to producing a prosthesis using the fixture 100, the impression coping 200, and the abutment 300 will be described with reference to FIG.

  As shown in FIG. 7A, the fixture 100 is embedded in the alveolar bone 400, and the impression is taken in a state where the surface of the fixture 100 and the alveolar bone 400 are bonded and the gingiva 500 is healed.

  First, as shown in FIG. 7B, the joint 250 side of the impression coping 200 is inserted into the abutment hole 150 of the fixture 100. Here, the impression coping 200 is positioned in the height direction when the joint surface 251 of the joint portion 250 comes into surface contact with the seat surface 153 of the abutment hole 150.

  Next, as shown in FIG. 7C, a tray 600 on which an impression material 610 such as silicon is placed is inserted into the oral cavity and the impression material 610 covers the periphery of the impression coping 200 and adjacent teeth. Press 600 against the dentition. Note that an impression material 610 may be applied around the impression coping 200 in advance.

  By removing the tray 600 from the state shown in FIG. 7C, as shown in FIG. 7D, an impression 620 in which the intraoral shape is reproduced can be obtained. Here, when the tray 600 is removed from the dentition, the impression coping 200 is detached from the fixture 100 and taken into the impression material 610, and the mounting position of the fixture 100 is transferred to the impression 620.

  In addition, although the method of taking an impression so that the impression coping 200 is taken into the impression material 610 (pickup impression method) is exemplified, the impression may be obtained by a different method. For example, a method (transfer impression method) may be used in which an impression is taken so that the impression coping 200 remains in the oral cavity, and the impression coping 200 is attached to the impression after the impression is taken.

  Next, as shown in FIG. 7E, the fixture analog 700 is attached to the impression coping 200 taken in the impression material 610. The fixture analog 700 is a dummy for reproducing the embedded state of the fixture 100 in the oral cavity on a plaster model, and is provided with an abutment hole having the same shape as the fixture 100.

  With the fixture analog 700 attached to the impression coping 200, a plaster model 800 is produced by pouring plaster into the impression 620 as shown in FIG. After the gypsum poured into the impression 620 is cured, the impression material 610 is removed from the gypsum model 800 together with the impression coping 200, whereby a gypsum model 800 that reproduces the inside of the oral cavity can be produced as shown in FIG. In the plaster model 800, a fixture analog 700 is embedded instead of the fixture 100 embedded in the oral cavity.

  Next, the abutment 300 is fixed to the fixture analog 700 of the plaster model 800 as shown in FIG. 7 (H), and the prosthesis 900 is produced as shown in FIG. 7 (I). The produced prosthesis 900 is removed from the gypsum model 800 together with the abutment 300 and attached to the fixture 100 embedded in the oral cavity.

  In the impression coping 200 according to the present embodiment, the joint surface 251 of the joint portion 250 comes into surface contact with the seat surface 153 provided in the abutment hole 150 of the fixture 100, so that the height direction with respect to the fixture 100 is increased. Is positioned. Thus, the positioning accuracy in the height direction with respect to the fixture 100 can be increased by positioning the impression coping 200 with respect to the fixture 100 by the butt joint. Therefore, it is possible to accurately transfer the mounting position of the fixture 100 to the impression 620 at the time of taking an impression and reproduce the position of the fixture 100 embedded in the oral cavity on the plaster model 800 with high accuracy.

  As described above, the impression coping 200 in the present embodiment is joined to the fixture 100 to which the abutment 300 is joined by a taper joint by a butt joint. With such a configuration, in the implant system in which the fixture 100 and the abutment 300 are joined by the taper joint and the wobbling of the abutment 300 can be suppressed, the position of the fixture 100 is accurately reproduced. It becomes possible to produce a prosthesis by using it. By producing a prosthesis using such a plaster model 800, the misalignment of the prosthesis when actually mounted on the fixture 100 in the oral cavity is reduced, and the meshing caused by the misalignment is deteriorated. It is possible to suppress the occurrence of such problems.

  As mentioned above, although the impression coping which concerns on embodiment was demonstrated, this invention is not limited to the said embodiment, A various deformation | transformation and improvement are possible within the scope of the present invention.

DESCRIPTION OF SYMBOLS 100 Fixture 150 Abutment hole 151 Tapered hole part 153 Seat surface 200 Impression coping 230 Taper insertion part 251 Joint surface 300 Abutment

Claims (2)

Inserted into the abutment hole of the fixture embedded in the oral cavity when taking an impression in dental implant treatment using a fixture in which an abutment hole is formed to fix and support the abutment with a tapered hole. Impression coping that transfers the fixture mounting position to the impression,
An impression coping characterized by having a joint surface in surface contact with a seat surface formed in the abutment hole. 2. The impression coping according to claim 1, further comprising a tapered insertion portion formed so that an outer peripheral surface thereof is along the inner peripheral surface of the tapered hole portion in a state of being inserted into the abutment hole.

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