JP5465974B2 - Crown prosthesis structure in natural teeth - Google Patents

Description

  The present invention relates to a crown prosthesis structure in a natural tooth, a method for constructing such a structure, and a method for disassembling a crown prosthesis structure for disassembling a once constructed crown prosthetic structure for repair and inspection.

  Conventionally, the crown prosthesis structure in the case where the root part of the tooth remains is established by fixing a post made of fiber material or the like to the root canal of the root and using a dental resin on the upper end surface of the root. A crown prosthesis structure is formed in the above-described order by forming and fixing a crown having a denture on the abutment with an adhesive or the like (see, for example, Patent Document 1).

  Specific configurations of the prosthetic crown structure including the above-mentioned patent documents are shown in FIGS. FIG. 23 shows a crown prosthesis structure 101 in which a cast crown 104 is fixed to an abutment with an adhesive, and a therapeutic resin material G1 as a root filler is placed at the bottom of the root canal F of the root E. A structure in which a molded abutment 103 made of an adhesive is formed on the post 102 that is filled in the root canal F of the root E and then the crown 104 cast on the abutment 103 is bonded with an adhesive G2 such as cement. It is. On the other hand, what is shown in FIG. 24 is a crown prosthesis structure 111 for fixing the abutment 113 with an adhesive, and the lowermost part of the root canal F of the root E is filled with a therapeutic resin material G1 as a root filler, Thereafter, the abutment 113 cast on the root canal F of the root E is fixed with an adhesive G2, and a crown 114 having a cast denture on the upper portion thereof is further adhered and fixed.

JP 2004-65579 A

  As described above, such a conventional crown prosthesis structure is a structure in which a dental crown having a denture on a support is placed and fixed with an adhesive such as cement.

  When repairing a crown prosthesis structure joined with an adhesive such as cement, it was impossible to remove the crown once it was fixed to the abutment, and the crown had to be destroyed and repaired. In other words, when it is necessary to repair the product due to the endurance of a long-term use or a sudden event, it is impossible to repair or inspect by removing components such as the crown or abutment. It was necessary to destroy all the components and remove all or part of the components. Such work increases the physical burden on the patient and is disadvantageous in terms of repair time and cost. Moreover, the elution of cement and cast metal by saliva may occur, causing health damage.

The present invention provides a fiber-like rod-like post fixed in a planted state via an adhesive in a longitudinal hole-like root canal formed in a tooth root, and a denture placement placed continuously on the upper surface of the tooth root via a rod-like post A substantially frustoconical abutment, a denture base formed with a fitting hole at the bottom and freely fitted to the abutment, and a denture attached to the denture base, and the abutment and the denture base Is configured to be detachably mounted and fixed via a taper fitting structure closely attached to each other , and the denture base can be inserted with a release tool for releasing the taper fitting between the abutment and the denture base. It is intended to provide a crown prosthesis structure in which a direction hole is drilled through the longitudinal hole so that the upper end surface of the upper part of the abutment is exposed .

  The abutment is formed in a substantially frustoconical shape, and has an insertion hole through which the rod-shaped post is inserted, and a flange is formed on the lower peripheral edge.

  In addition, a groove is formed on the peripheral end surface of the insertion hole that is the upper end surface of the abutment, and an engagement protrusion is formed inside the fitting hole of the denture base, and the abutment and the denture base are formed by the groove and the engagement protrusion. It is configured to perform positioning when taper fitting is performed.

According to the first aspect of the present invention, the fiber-shaped rod-shaped post fixed in the planted state via the adhesive in the longitudinal hole-shaped root canal formed in the tooth root, and the upper surface of the tooth root via the rod-shaped post. It is composed of a substantially truncated cone-shaped abutment for placing a denture, a denture base that is formed with a fitting hole in the bottom so that it can be freely fitted to the abutment, and a denture that is attached to the denture base. Since the base and the denture base are configured to be detachably mounted and fixed via a taper fitting structure in close contact with each other, the abutment and the denture base can be fitted via the taper fitting structure. As a result, both can be securely inserted and removed, and the construction of the prosthesis can be performed in a short time, and repairs and inspections after construction can be easily performed, reducing the medical psychological burden on the patient as much as possible. In addition, it does not use screws or cement for complicated work. There is an effect that can be performed fitted continuous 設作 industry and detachment work of the abutment and the denture base by a simple operation without the need. Since the abutment and the denture base are separated from each other through the taper fitting structure using a separate male threading tool prepared in this way, cement bonding and screw screwing are not required, and various problems arise from these. Can avoid major dental problems.
Moreover, since the upper part of the abutment is exposed at the lower part of the female screw hole, when the abutment and the denture base are separated from each other through the taper fitting structure using the male screw for separation, the abutment is used. There is an effect that the denture base can be easily detached from the abutment by using the tightening reaction force acting on the upper portion of the base.

  According to the invention of claim 2, the abutment is formed in a substantially frustoconical shape, the insertion hole through which the rod-shaped post is inserted is opened, and the hook is formed on the lower peripheral edge, whereby the root canal of the tooth root is formed. The planted post can be inserted into the insertion hole of the abutment and bonded and fixed, and the abutment can be placed in a stable state with respect to the upper end surface of the tooth root. .

  According to invention of Claim 3, while forming a groove part in the penetration hole peripheral end surface used as the upper end surface of an abutment, an engagement protrusion is formed in the fitting hole of a denture base, and a groove part and an engagement protrusion are used. By configuring so that the abutment and the denture base are taper-fitted, the denture base that is taper-fitted to the abutment will not be rotated and the front and back surfaces of the denture base are distinguished. Positioning can be performed, and the prosthetic construction work can be performed accurately in a short time regardless of the skill.

It is explanatory drawing which shows the crown prosthesis structure of this embodiment. It is a disassembled perspective view which shows the crown prosthesis structure of this embodiment. It is a disassembled perspective view which shows the modification of a crown prosthesis structure. It is a disassembled perspective view which shows the modification of a crown prosthesis structure. It is a disassembled perspective view which shows the modification of a crown prosthesis structure. It is a disassembled perspective view which shows the modification of a crown prosthesis structure. It is a disassembled perspective view which shows the modification of a crown prosthesis structure. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is process drawing which shows the construction method of the crown prosthesis structure of this embodiment. It is a perspective view which shows the male screw tool for separation | separation. It is explanatory drawing which shows the conventional crown prosthesis structure. It is explanatory drawing which shows the conventional crown prosthesis structure.

  An embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 28, the crown prosthesis structure, the method for constructing the crown prosthesis structure, and the method for disassembling the crown prosthesis structure according to the embodiment of the present invention are configured as follows. The crown prosthetic structures shown in FIGS. 1 to 4 and FIGS. 8 to 21 are applied to anterior teeth and premolars in natural teeth.

I [Coronal prosthetic structure]
As shown in FIGS. 1 and 2, the crown prosthesis structure 1 of the embodiment includes a fiber-like rod-like post 2 fixed in a rooted state via an adhesive G2 in a root canal F of a root E, and its Mounted on the denture base 4, which is mounted on the upper surface H of the root E via the rod-shaped post 2, the substantially frustoconical abutment 3 for placing the denture, placed on and fixed to the upper portion 13 of the abutment 3, and The denture 5 is made up of.

  The abutment 3 is formed with an insertion hole 12 drilled in the vertical direction through which the rod-like post is inserted, and a disc-shaped flange 3b is formed at the lower peripheral edge thereof. When the abutment 3 and the root E are fixed integrally, the rod-like post 2 that has been planted in the root canal F opened on the upper surface H of the cut root E is inserted into the insertion hole 12 and bonded. By filling the agent G2, the abutment 3 is fixed to the tooth root E upper surface H.

  Moreover, the outer peripheral surface 3a of the abutment 3 and the inner peripheral surface 14a of the fitting hole 14 of the denture base 4 form corresponding tapered surfaces so that the abutment 3 and the denture base 4 are in close contact with each other. Yes. Thus, both are configured to be detachably fitted via the taper fitting structure 10. On the other hand, in the denture base 4, a vertical female screw hole 11 drilled in the denture base 4 is bored so that the upper end surface of the upper portion 13 of the abutment 3 is exposed.

  In addition, although the collar part 3b was provided in the abutment 3 in this embodiment, it is not necessary to limit to such a form, For example, the shape of the abutment which does not have a collar part may be sufficient.

  As shown in FIGS. 1 and 2, the abutment 3 is formed in a substantially truncated cone shape. The upper end surface of the upper portion 13 is flattened and an insertion hole 12 through which the rod-like post 2 is inserted is opened in the upper portion 13. However, the abutment 3 is not limited to such a configuration, and various modifications can be used. The modification shown in FIGS. 3 and 4 differs in the shape of the upper part of the abutment 3.

  That is, as shown in FIG. 3, the upper portion 13 of the abutment 3 is formed with a central insertion hole 12 in the upper portion 13 and a groove portion 18 in which the peripheral end surface of the insertion hole 12 in the upper portion 13 is hollowed out in a substantially tapered shape in cross section. Has been. A shape corresponding to the upper groove 18 is formed inside the fitting hole 14 of the denture base 4. In other words, the groove portion 18 of the abutment 3 includes a tapered portion 18a having a substantially tapered shape in cross section, a first contact surface 18b formed perpendicularly from the upper portion 13 on the terminal side of the tapered portion 18a, and a starting end of the tapered portion 18a. The second contact surface 18c is formed on the side from the upper portion 13 in the vertical direction. The engagement protrusion 23 in the fitting hole 14 of the denture base 4 has a tapered portion 24a having a substantially tapered shape in cross section corresponding to the groove portion 18 of the abutment 3, and a vertical direction from the upper wall surface to the terminal side of the tapered portion 24a. The first contact surface 24b is formed on the first end surface of the taper portion 24a, and the second contact surface 24c is formed on the start end side of the tapered portion 24a in the vertical direction from the upper wall surface.

  On the other hand, when attaching the denture base 4 to the abutment 3, the tapered portion 24 a of the denture base 4 slides on the tapered portion 18 a of the abutment 3, and the first contact surface 24 b of the denture base 4 and the abutment 3. The first contact surfaces 18b, the second contact surface 24c of the denture base 4 and the second contact surfaces 18c of the abutment 3 are in contact with each other, that is, the groove 18 and the engagement protrusion 23 are engaged. Thus, the denture base 4 that is taper-fitted is not rotationally displaced, and the front surface and the back surface of the denture base 4 can be distinguished and positioned.

  On the other hand, when the denture base 4 is removed from the abutment 3, a male screw Q for separation, which will be described later, is inserted into the female screw hole of the denture base 4, and the male screw for separation is placed above the exposed abutment 3. By contacting the flat portion Q3 of the tool Q, the taper fitting between the abutment 3 and the denture base 4 is released, and the denture base 4 can be removed from the abutment 3.

  Next, as shown in FIG. 4, the upper portion 13 of the abutment 3 is formed with an insertion hole 12 at the center of the upper portion and a groove portion 19 in which the circumferential end surface of the insertion hole 12 of the upper portion 13 is hollowed out into a semi-cylindrical shape. . A convex engagement protrusion 23 corresponding to the groove portion 19 of the upper portion 13 is formed inside the fitting hole 14 of the denture base 4.

  On the other hand, when the denture base 4 is attached to the abutment 3, the convex portion 24 d of the engagement protrusion 23 inside the fitting hole 14 of the denture base 4 is engaged with the groove portion 19 of the abutment 3, thereby taper fitting. Thus, the denture base 4 is prevented from rotationally deviating, and the front surface and the back surface of the denture base 4 can be distinguished and positioned.

  On the other hand, when removing the denture base 4 from the abutment 3, a male screw tool Q for separation, which will be described later, is inserted into the female screw hole 11 of the denture base 4, and is separated from the exposed upper portion 13 of the abutment 3. By contacting the flat part Q3 of the male screw tool Q, the taper fitting between the abutment 3 and the denture base 4 is released, and the denture base 4 can be removed from the abutment 3.

  By making the upper part into a concave shape, when the denture base 4 is fitted to the abutment 3, the front surface and the back surface of the denture base 4 can be distinguished and positioned.

  The modification shown in FIGS. 5 to 7 is to attach the abutment 3 for the molar tooth to the root E obtained by cutting the molar tooth, which is particularly different from the embodiment shown in FIGS. The structure in which two tapered insertion holes are formed in the table 3 is different. In addition, about the structure in a following example, the same code | symbol as the structure of the Example mentioned above is attached | subjected, and duplication description is abbreviate | omitted.

  That is, in the crown prosthesis structure 1 shown in FIG. 5, the upper portion 13 of the abutment 3 is formed flat, and two insertion holes 12 and 12 are opened in the upper portion, and the insertion holes 12 and 12 are directed downward. It is formed in an expanded shape.

  When the abutment 3 is fixed to the root E, the two posts 2 and 2 planted on the root E are inserted into the insertion holes 12 and 12, and the insertion holes 12 and 12 are filled with an adhesive. As a result, the abutment 3 is fixed to the tooth root E, and the denture base 4 is fitted into the abutment 3 by taper fitting.

  Next, the crown prosthesis structure 1 shown in FIG. 6 is different in that two insertion holes 12 of the abutment 3 in the crown prosthesis structure 1 shown in FIG. 3 are formed, and the other configurations and effects are the same. Therefore, duplicate explanation is omitted.

  Next, the crown prosthesis structure 1 shown in FIG. 7 differs in that two insertion holes 12 of the abutment 3 in the crown prosthesis structure 1 shown in FIG. 4 are drilled, and the other configurations and effects are the same. Therefore, duplicate explanation is omitted.

  According to the crown prosthesis structure shown in FIGS. 5 to 7, two posts 2 and 2 are planted on the root E of the molar, and the posts 2 and 2 are inserted into the insertion holes 12 and 12 of the abutment 3. Then, by hardening with the adhesive G2, the abutment 3 can be firmly bonded and fixed to the root E of the molar tooth, and further, the abutment 3 and the denture base 4 are made into a taper fitting structure 10. There is an effect that the denture base 4 can be easily attached or detached.

II [How to build a prosthetic crown structure]
As shown in FIGS. 8-21, the crown prosthesis structure construction method includes the following steps i) to xiii).
In this embodiment, a construction method for performing prosthesis on the root E of natural teeth will be described first, and then a method for disassembling the prosthetic structure will be described.

  That is, in step i), as shown in FIG. 8, the tooth is cut until the upper end surface of the root E and the surface of the gingiva A are in the surface position, and the root canal F is opened to the upper surface H of the root E. A small amount of the therapeutic resin material G1 as a filler is filled, and then the rod-like post 2 made of a fiber material or the like is inserted into the root canal F, and the root canal F is filled with the adhesive G2 to thereby remove the rod-like post 2 from the root E. It consists of a post planting process.

  In step ii), as shown in FIG. 9, a substantially frustoconical abutment 3 for placing a denture connected to the upper surface H of the tooth root E via the rod-shaped post 2 is placed on the upper surface H of the tooth root E. That is, by inserting the rod-like post 2 protruding from the root surface H into the insertion hole 12 of the abutment 3 and filling the insertion hole 12 of the abutment 3 with the adhesive G2 and curing it, the abutment 3 is fixed on the top surface of the tooth root E. It consists of the abutment fixing process fixed to H.

  In step iii), the denture base 4 is fitted to the peripheral surface of the abutment 3 by fitting the denture base 4 to the upper portion 13 of the abutment 3 via the taper fitting structure 10 as shown in FIG. It consists of a denture base fitting process in which the hole 14 is closely fitted.

  Step iv) includes a mold taking and covering step of covering the tooth arrangement portion C including the denture base 4 with a mold taking resin L in order to mold the tooth arrangement portion C including the denture base 4 as shown in FIG. Prior to coating the mold taking resin L, a long screw rod 22 is screwed into the female screw hole 11 of the denture base 4, and after the above mold taking covering process is completed, the screw from the denture base 4 is screwed. The rod 22 is removed.

  In the figure, P is a mold taking container for holding the mold taking resin L.

  In step v), as shown in FIG. 12, a separate male screw tool Q prepared separately from above the molding resin L is screwed into the starting end of the female screw hole 11 of the denture base 4 to separate the male screw tool for separation. Denture base detachment in which the abutment 3 and the denture base 4 are separated using the pressure reaction force while the tip surface of Q is pressed against the upper portion 13 of the abutment 3 so that the abutment 3 remains in the oral cavity D. It consists of a process.

  The molding resin L is provided with an opening hole L1 so that the opening end 11a of the female screw hole 11 of the denture base 4 is exposed.

  In step vi), as shown in FIG. 13, the mold taking resin L having the denture base 4 separated from the abutment 3 is taken out from the oral cavity D and reversed, and the denture base 4 opened on the surface of the mold taking resin L. The taper-shaped fitting hole 14 includes a temporary anchoring step of fitting a temporary anchor 80 of a replica abutment having a shape facing the fitting hole 14. The tip of the temporary anchor 80 is formed in a shape opposite to the tapered fitting hole 14 of the denture base 4, that is, in the same shape as the tapered fitting structure 10 of the abutment 3 remaining in the oral cavity D of the patient. Yes. The temporary anchor 80 has a structure in which the replica abutment and the replica abutment are integrally formed. However, the structure is not limited to this structure, and the replica abutment and the replica abutment are not limited to this structure. It may be a structure in which the abutment is separated.

  In step vii), as shown in FIG. 14, the temporary fixing anchor 80 of the replica abutment is temporarily fitted into the tapered fitting hole 14 of the denture base 4 via the tapered fitting structure 10. It consists of a molding material inflow process in which a molding material R such as gypsum flows into the surface recess L2 of the molding resin L so as to embed the anchor 80.

  When the mold material R flows in, not only the position of the temporary anchor 80 of the replica abutment but also the shape of the teeth and other peripheral shapes are modeled.

  In step viii), as shown in FIG. 15, after the mold material R is cured, the mold is cured together with the temporary anchors 80 from the surface recesses of the mold resin L while the denture base 4 remains in the mold resin L. By removing the material, it comprises a model manufacturing process for completing the tooth arrangement model S in the oral cavity D by a molding material such as gypsum. At this time, conventionally, the model was prepared using a denture base newly cast on the abutment, but in this embodiment, the model can be prepared using the existing denture base 4, It is possible to form a tooth arrangement model S that is more precise and has no tolerance.

  When the denture base 4 remaining in the molding resin L is removed from the temporary anchor 80, a reaction force generated by tightening to the limit can be used by using a separate male screw tool Q for separation. (See FIG. 14).

  In step ix), as shown in FIG. 16, the denture base 4 is fitted and placed on the tapered head of the temporary anchor 80 exposed at the prosthetic-corresponding portion of the tooth arrangement model via the taper fitting structure 10. It consists of a denture base fitting process to 80.

  As shown in FIG. 17, the step x) includes a crowning step of crowning the denture 5 on the engaging projections 4a,..., 4a of the denture base 4 while adjusting with the surrounding tooth arrangement model S.

  In step xi), as shown in FIG. 18, a separate male screw tool Q for separation is screwed in from the starting end of the female screw hole 11 of the denture base 4 and the tip surface is pressed against the upper end surface of the temporary anchor 80. It consists of a denture base taking-out step of taking out the denture base 4 by separating it from the temporary anchor 80 using the pressure reaction force.

  In step xii), as shown in FIG. 19, the extracted denture base 4 is fitted to the abutment 3 installed in the oral cavity D of the patient via the taper fitting structure 10, so that the circumference of the abutment 3 is It consists of the final denture base fitting process which closely fits the fitting hole 14 of the denture base 4 to the surface.

  In step xiii), as shown in FIG. 20, a closing screw 8 having a flat lower end is screwed into the female screw hole 11 so as to close the female screw hole 11 formed in the center of the denture base 4. The female screw hole closing step.

  As shown in FIG. 21, the working hole 16 corresponding to the female screw hole 11 formed in the upper end surface of the denture 5 is closed with a closing body 17 after the end of the step xiii).

  Conventionally, the denture base cast at the time of making the model was used. However, since the existing denture base can be used for the denture base according to this embodiment, the weight can be reduced, and casting is performed. Since there is no need for a process, there is an effect that allergies due to elution from the casting are eliminated.

IV [Method for disassembling crown prosthesis structure]
The method for removing the denture base in the above-described crown prosthesis structure, that is, the method for disassembling the crown prosthesis structure is performed as follows.

  In FIG. 1, the closing screw 8 screwed into the female screw hole 11 drilled in the longitudinal direction in the denture base 4 is screwed out from the upper end opening of the female screw hole 11 and then removed as shown in FIG. In such a manner, a male screw tool Q made of a male screw prepared separately is screwed into the female screw hole 11 from which the closing screw 8 has been removed, and the lower end surface of the male screw tool Q for separation is The denture base 4 can be detached from the abutment 3 by using the reaction force of the denture base 4 against the abutment 3 by further advancing after making contact with the upper part of the abutment located at the lower end. .

V [Separately prepared jig]
Separately prepared jigs used for the above-described method for constructing the prosthetic crown structure and the method for disassembling the prosthetic structure are as follows.

(3) The male screw tool Q for separation used in steps v) and xi), as shown in FIG. 22, has a handle portion Q1 on a disk at its upper end, and a female screw hole 11 of the denture base 4 at its center. And a screw part Q2 that can be screwed together, and the lower end of the screw part Q2 forms a flat part Q3.

  When removing the denture base 4 from the abutment 3, when the male screw tool Q for separation is screwed into the female screw hole 11 of the denture base 4, and then further tightened in the state of being screwed to the limit, the flat part and the upper part 13 The denture base 4 can be detached from the taper fitting structure 10 and removed by generating a reaction force at the contact portion.

A Gingival B Jawbone C Teeth alignment part D Oral E Root F Root canal G1 Treatment resin G2 Adhesive L Molding resin P Molding container Q Separating male screw 1 Crown prosthetic structure 2 Post 3 Abutment 4 Denture base 5 Denture 8 Closing screw 10 Taper fitting structure 11 Female screw hole 14 Fitting hole

Claims (3)

A fiber-shaped rod-shaped post fixed in a planted state via an adhesive in a vertical hole-shaped root canal formed in the root, and a substantially conical for placing a denture on the upper surface of the root via a rod-shaped post Consists of a trapezoidal abutment, a denture base formed with a fitting hole at the bottom and freely fitted to the abutment, and a denture attached to the denture base,
Moreover, the abutment and the denture base are configured to be detachably mounted and fixed via a taper fitting structure in close contact with each other ,
The denture base has a vertical hole into which a release tool for releasing the taper fit between the abutment and the denture base can be inserted, and the upper end surface of the upper part of the abutment is exposed through the vertical hole. A dental prosthetic structure characterized by being drilled as described above . 2. The crown prosthesis structure according to claim 1, wherein the abutment is formed in a substantially truncated cone shape, an insertion hole through which the rod-like post is inserted is opened, and a flange is formed at a lower peripheral edge. 3. A groove is formed in the peripheral end surface of the insertion hole, which is the upper end surface of the abutment, and an engagement protrusion is formed inside the fitting hole of the denture base, and the abutment and the denture base are taper-fitted by the groove and the engagement protrusion. The crown prosthesis structure according to claim 1 or 2, characterized in that positioning is performed at the time of matching.

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