JPH09201373A - Dental post provided with support frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate removal of a support frame by inserting a chisel part for a dental post into a slot in a bent part of the support frame so as to fit the support frame in the dental post and then rotating the chisel part so as to fix a shoulder part in such a state as pushing against a step. SOLUTION: This dental post 10 is provided with a narrow and long main body having a conical bottom end part 14 fitted to a tooth canal in the bottom. An outer screw 18 is formed in the intermediate part 16 of the main body so as to be fitted to the tooth canal in a immobile state and a tool engagement part 22 is provided thereon. The chisel part 26 having a pointed upper edge 28 which is T-shaped and laterally extends with a tapered part 24 is continued above it. The support frame is provided with leg parts 30, 32 having slots 46, 46 which are opposed to each other via the bent part 34 so as to form a V-shaped structure and this support frame 12 is held by the post 10 so that pads 42, 44 are aligned on respective steps 70, 72 of the root 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor for supporting a dental prosthesis structure, and more particularly to a tooth stump.
ub) a dental post for insertion into the tooth canal and a fountain composite (foun) for holding a dental reduction provided thereon extending upwardly from the root stump.
A support frame that is captured and mated with the top of a dental post, preferably surrounded by a lutimg material, such as a synthetic material, to form a dation complex.

[0002]

Dental posts are well known in the dental art. In almost all cases, a tooth that has lost the crown portion extending above the gum line due to an accident, negligence, tooth decay, etc., needs to have nerves removed from the canal by an endodontic occlusion procedure, in which the canal is removed. Are carefully exposed and washed and their roots are securely sealed with an impermeable gutta-percha material. Following this treatment, the dental canal is a metal dental prefabricated or also custom-molded to form an anchoring and support base for an artificial crown or jacket crown replacement. It is often spread to the desired size and shape to accommodate the service posts.

A number of dental posts have been proposed in the prior art. In some posts, external threads are provided to provide additional surface area for cement to improve retention of the dental post within the root stock. However, while the threads formed on conventional dental posts aid in retention, at the same time, the threads reduce the diameter of the dental post, which results in breakage during insertion and actual use of the dental post. Increase the risk.

A number of dental posts for repositioning teeth have been proposed in the prior art, with a single post currently providing a passive fit, horizontal shear holding force and among others. It has many essential elements to achieve its optimal performance, such as providing its future modification when it is necessary to re-enter the dental canal for retreatment of Absent. Furthermore, conventional dental posts are now capable of achieving such treatments aesthetically and economically without the need for expensive laboratory technical procedures and the need to visit multiple hospitals. You have lost the means to. Therefore, one-visit chairside procedure, where the installation of the dental post is the most economical method, is used to match the tooth with a shape with natural root canal morphology. Passively anchored to the tube, has a strong lateral support structure and offers most of the advantages of action, retention and reversibility, and aesthetics, ease of use and economy There is a need for a dental post that satisfies most of the requirements of sex and can be easily achieved.

[0005]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an improved dental post that overcomes the problems in conventional dental suspect surgery.

Another object of the present invention is to provide a dental post with enhanced retainability in the root stock as well as in the dental restorations provided therein.

Another object of the present invention is to provide a dental post provided with a support frame that resists horizontal shear forces.

Yet another object of the present invention is to provide a dental post provided with a support frame which allows future modifications to re-enter the dental canal for retreatment therein. .

Yet another object of the present invention is to provide a dental post provided with a support frame which is captured and mated thereon.

Yet another object of the present invention is to create a laminated synthetic / metal base composite that is anchored to a root stock to receive an artificial crown or jacket thereon. To provide a dental post that is moldable, self-polymerizing, and provided with a support frame that is surrounded and captured by a mud sealing material, such as a tooth color composition.

Yet another object of the present invention is to provide for ease of use, ease of simple assembly, expensive laboratory technical procedures and multiple hospitals commonly required in the prior art. It is an object of the present invention to provide a dental post provided with a supporting frame that enables an aesthetic and economical treatment that can be easily performed in one treatment without visiting.

[0012]

SUMMARY OF THE INVENTION Briefly stated, in accordance with the present invention, a laminated synthetic / metallic structure is provided for capturing and interlocking thereon and for securely supporting a dental restoration on a root stock. Provided is a dental post having a support frame that is preferably moldable, self-polymerizing, and surrounded and mated with a mud sealing material, such as a tooth color synthetic material, to create a base composite. . The post includes a smooth, conical lower end portion for a matching fit to the prepared dental canal, a threaded portion for immovably fitting the canal for engaging synthetic material, and a repositioned tooth. A non-threaded portion that provides greater strength to withstand the bending and shear forces acting on it, and a square portion that can be rotated out of the hardened synthetic material to remove the dental post from the canal. , A tapered portion and a chisel-like portion of the upper end of the dental post for engaging the support frame.

The support frame includes a pair of opposed legs for straddling the upper portion of the dental post, and bent portions that join the legs together, the bent portions engaging and engaging the dental post and the support frame together. A pair of pads for seating on a step formed in the root stump extending laterally outward from the lower ends of the legs having slots for receiving chisel portions therethrough for And the bifurcated leg portion can be twisted into a constant rotational position with respect to the pad to receive the synthetic material therethrough and to reinforce the structure of the leg portion to prevent bending of the leg portion. Thus elongated slots are formed in the legs. The chiseled portion of the dental post is inserted through the slot into the bent portion of the support frame and then rotated 90 degrees to mate the dental post and the support frame together.

In view of the above and additional objectives and advantages, as well as those apparent from the following description, the invention is an apparatus, combination and arrangement as illustrated and described in the accompanying drawings of the preferred embodiment described below. It is composed of

In the drawings, like reference numerals are attached to like parts.

[0016]

DETAILED DESCRIPTION OF THE INVENTION Referring to the drawings, FIG. 1 illustrates a dental post 10 and a support frame 12 according to the present invention. The dental post 10 is made of a suitable metallic material and has a smooth conical lower end portion 1 at one longitudinal end thereof adapted to fit a prepared dental canal described below.
4 comprises an elongated body having 4. Adjacently and upwardly directed portion 16 has its outer surface adapted to immobilize the prepared dental canal without any engagement with the walls of the dental canal, which will be described in more detail below. Has an external thread 18 formed on the. The next adjacent and upwardly directed portion 20 is not threaded and is non-threaded portion 20 to withstand bending and shearing forces acting on the reduced teeth.
Has the same diameter as the large side diameter of the thread 18 to provide greater strength.

Next adjacently and upwardly directed part 2
2 has a non-circular profile so that the portion 22 can engage the instrument when the dental post 10 described in detail below is turned off. Preferably, portion 22 has a square shape that can engage a conventional square socket key well known in the art. The next-adjacent, upwardly-directed portion 24 then tapers inwardly so as to extend away from portion 22 so as to reduce its thickness above.

Finally, the next upwardly directed portion 26 is located at the longitudinal apex of the dental post 10. The longitudinal length of the portion 26 extends transversely to the longitudinal axis of the dental post 10 so as to form a T-shaped arrangement with the tapered portion 24, and a laterally extending pointed upper end. It has a triangular cross-sectional shape so as to provide a box-like structure with edges 28, the function of which will be described later. Further, the chisel-shaped portion 26 has a length substantially equal to the diagonal length of the square-shaped portion 22, but a conventional square socket key is formed on the chisel-shaped portion 26 when engaged with the square-shaped portion 22, which will be described in detail later. No more than that, so that it can be inserted.

The support frame 12 is preferably made of a thin, highly resilient, suitable metal, preferably coated with an opaque material in the color of the tooth or provided with a ceramic surface. Alternatively, the support frame 12 can be made of any suitable plastic or ceramic material.

The support frames 12, which are formed in a number of straight directions to withstand forces and mate and support the synthetic material as described above, are opposed to each other joined together by flexures 34 to provide a V-shaped structure. It has legs 30 and 32. However, the bent portion 34 should be arcuately curved to provide a U-shaped configuration and be extended to increase the spacing between the legs 30, 32 for use with larger posterior teeth such as molars. It should be appreciated that even it is possible. Elongated, longitudinally extending slot 3
6 is provided in the bent portion 34, whereby a slot 36
Extend downwardly from the apex of the bent portion 34 to opposite sides of the support frame 12. Therefore, the slot 36 forms a pair of shoulders 38, 40 at the apex of the bent portion 34, the function of which will be described later. Note that the width of the slot 36 is about the same as or slightly larger than the width of the base of the chisel 26 and also the reduced top thickness of the tapered portion 24.

A pair of feet or pads 42,44 extend laterally outwardly from the lower ends of the legs 30,32 in opposite directions spaced apart from one another. Due to the adjustability of the support frame 12, which allows the legs 30, 32 to be bent toward or away from each other, the pads 42, 44 allow the chewing and other functions as well as parafuncti.
on) During movement of the jaws and teeth, adjustments can be made to the widest part of the root stock to avoid shearing and expelling of the basal composite described below.

A pair of elongated, longitudinally extending slots 46,48 are provided in the legs 30,32, respectively, where the slots 46,48 are in the pads 42,44 to bifurcate the legs 30,32. Each extends. As shown below, the synthetic material extends through slots 46, 48 to engage and support the legs 30, 32 with the synthetic material. Furthermore, the slots 46, 48 are
Bifurcated portions 50, 52 of leg 30 and leg 3 so as to reinforce the structure of leg 30, 32 to prevent 0, 32 from bending laterally along its longitudinal length.
It is possible to twist the two bifurcated parts 54, 56 into fixed rotational positions with respect to the pads 42, 44, respectively.

2 to 7, the function and other aspects of the dental post 10 and support frame 12 will become apparent when the inventive assembly of the prosthetic structure is described. FIG. 2 shows a root stump 60 in the area of gingiva 62, where the coronal portion of the tooth extending above the area of gingiva 62 has been lost due to accident, negligence, caries or the like. Typically, the teeth are first shaved, and the nerves are removed from the canal 66 by an endodontic occlusion procedure.

The canal is carefully spread and cleaned to remove the pulp from the canal 66, then the top of the canal is securely sealed with an impermeable gutta-percha material. A special square contouring reamer 68 is used to spread the canal 66 into the desired predetermined size and shape to fit and fit the smooth conical lower end portion 14 of the dental post 10. Allows the smooth conical lower end portion 14 to be received in line therein. In addition, a pair of opposed right-angled steps 70, 72 are provided on the ledge of the root canal 60 in the region of maximum width of the root canal 60 extending from the lingual surface to the oral surface.
It is formed adjacent to 6.

Thereafter, as shown in FIG. 3, the dental post 10 is inserted into the dental canal 66 in a snug, balanced arrangement so that the dental post 10 is supported in an upright position.
In this position, the opposite ends of the chisel 26 are aligned outward facing the steps 70, 72 of the root stock 60. Note that only the smooth conical lower end portion 14 engages the wall of the tooth tube 66, thus preventing the corkscrew effect. At this time, the thread portion 16 is the thread 1 of the thread portion 16.
It is immovably fitted to the tooth tube 66 so that 8 does not engage the wall of the tooth tube 66. Further, the unthreaded portion 20 of the dental post 10 is positioned across the upper surface 64 of the root stock 60 to provide greater strength to withstand the bending and shearing forces acting on the reduced teeth as previously described. Is preferred.

The support frame 12 is retained on the dental post 10 such that the pads 42,44 are aligned on the respective steps 70,72 of the root stock 60, where the legs 30 are, as previously described. , 32 is step 70,
Each can be bent to adjust a portion of the pads 42,44 into alignment with 72. In this position, the elongated slot 36 of the bent portion 34 of the support frame 12 is aligned directly over the chiseled portion 26 of the dental post 10. The support frame 12 includes a dental post 10 such that the sharp upper edge 28 of the chisel portion 26 guides the chisel portion 26 through an elongated slot 36.
Is descended to.

Once the elongated slot 36 has passed through the chisel 26, the pads 42,44 rest on the respective steps 70,72, thereby causing the legs 30,32 of the support frame 12 to move to the As shown in FIG. 4, it straddles the upper part of the dental post 10. It should be appreciated that the depth of steps 70, 72 of the root stock 60 can be modified to obtain the proper position of the support frame 12 as shown in FIG. Further, by increasing the downward taper of the tapered portion 24, the slot 36 is engaged at the reduced top end thickness portion of the tapered portion 24 adjacent to the chisel portion 26 and is tapered. It is prevented from sliding down further than the attached portion 24.

The dental post 10 has a support frame 12 that engages and engages with the dental post 10, as shown in FIG. 5, to prevent its removal from the dental post 10 on any side and downward. Then, it is rotated 90 degrees in either direction. In this position, the bent portion 3
4 is captured and retained in the reduced uppermost thickness portion of the tapered portion 24, with the underside of the wide base of the chisel portion 26 holding it to retain the support frame 12. To apply force, the shoulders 38, 40 are engaged at the apex of the flexion portion 34 of the support frame 12, and the dental post 10 is in place during subsequent laminating and sealing procedures, as described below. Reserved. Pads 42,44
Is firmly seated in each step 70, 72 to provide a broad support base for shearing and expelling the base mixture during masticatory and other functional and pseudo functional jaw and tooth movements, as described below. Please note that.

Support frame 12 and dental post 10
Is surrounded by and interlocked with a moldable, self-polymerizing, tooth-colored synthetic material 74, or other suitable sealing material known in the dental art, where the synthetic material 74 is threaded. Extends to a dental canal 66 around the portion 16. The synthetic material 74 is packed by methods well known in the art, and the dental post 10 and the support frame 12 are combined to create a laminated synthetic / metal base composite 76 anchored to the root stock 60. Can be cured to The filled and hardened synthetic material 74 is then prepared in the desired shape with a well-known diamond tool to provide a base for an artificial crown or jacket, as shown in FIG.

In an alternative method, the dental post 10
The support frame 12 and the support frame 12 can first be interengaged with each other as described above, and then mounted on the dental canal 66 as an assembled unit, as shown in FIG.
And note that the steps shown in FIG. 4 can be passed. Similarly, the dental post 10 and the support frame 12 are
First, as described above, they can be interengaged as an assembled unit, then surrounded by a synthetic material 74 and then inserted into a dental canal 66, whereby the synthetic material 74 is packed and cured, and then the It can also be prepared in a desired shape as shown in FIG.

As shown in FIG. 6, once the base mixture 76 is formed, it is aesthetically tuned to a tooth color in accordance with the requirements of current porcelain crowns or jackets, according to techniques common in the dental arts. Prosthetic structures or dental restorations, such as artificial crowns or jackets, to enclose the base mixture 76 therein, as shown in FIG. 7, to provide the desired shape with a tinted background color. 78 is suitably provided on the upper surface 64 of the root stock 60.

It should be noted that the above-described preparation and installation can be easily achieved with one treatment, which is the most economical method. Thus, the combination of an immovably cemented dental post that conforms to a shape with a natural root morphology with a strong lateral support frame and a strong, widely used synthetic material provides a combination of function, retention and removal. Offers most of the potential benefits of. Base Mixture 7 described above
The design of the dental post 10 forming the 6, the construction of the lateral support frame 12 and the synthetic material 74, together with the jacket crown 78, are the basic elements for repositioning to the finished tooth and the aesthetics. Meets most requirements for ease of use and economy.

It should also be noted that the dental post 10 can be safely removed from the dental canal 66 at any time. Therefore, first the jacket crown 78, the upper part of the synthetic material 74 and the support frame 12 are removed. The synthetic material 74 surrounding the square portion 22 of the dental post 10 is then removed in a manner conventional in the dental art so as to expose the upper portion of the dental post 10. The square socket key described above is then inserted into the upper free end chisel 26 of the dental post 10 to rotate the dental post (counterclockwise) without damaging the root stump 60. ) Engage with the square section 22 for release from the hardened synthetic material 74 surrounding the threaded section 16 within the tooth tube 66.

Many alternatives to the structures described herein will be suggested to those skilled in the art. However, it should be understood that the disclosure herein is directed to preferred embodiments of the invention, which are for purposes of illustration only and are not to be construed as limiting the invention.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a dental post and a support frame according to the present invention.

FIG. 2 is a cross-sectional view through a root canal showing a special rectangular contouring reamer with a canal widened to a desired size and shape.

3 is a cross-sectional view similar to FIG. 2, showing a dental post placed in a prepared dental canal.

FIG. 4 is a cross-sectional view similar to FIG. 3 showing the support frame located on the dental post.

5 is a cross-sectional view similar to FIG. 4, showing the support frame engaged to the dental post.

FIG. 6: Synthetic material disposed on the root stock to surround the support frame, prepared with synthetic material to wrap the threaded portion of the dental post, and also to provide the desired shape. 6 is a sectional view similar to FIG.

FIG. 7 is a cross-sectional view similar to FIG. 6 showing a dental restoration having synthetic material disposed and wrapped therein to provide a restored tooth.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Dental post 12 Support frame 14 Smooth conical lower end portion 16 Threaded portion 20 Non-threaded portion 22 Squared portion 24 Tapered portion 26 Raggered portion 30, 32 Leg portion 34 Bent portion 36 Slot 38, 40 Shoulder 42,44 Pad 46,48 Slot 60 Root stump 66 Dental canal 70,72 Step 74 Synthetic material 76 Laminated synthetic / metal base composite 78 Dental reduction

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 596022031 225 East 48th Street, New York, New York 10017 U. S. A.

Claims (20)

[Claims] 1. A dental post for retaining a dental restoration in a prepared stub having a tube therein, comprising an elongated body and a smooth conical lower end portion. , Tooth cana
l) a first member for a matching fit, and a threaded portion that engages the fixation material while allowing the threaded portion to be rotated out of the fixation material to remove the dental post from the canal A second member for preventing the dental post from being pulled out of the canal and also for contacting the fixing material so that the dental post can be retrieved from the canal, a screw which is a non-circular part A third member for facilitating turning of the threaded portion out of the fastening material, the threaded portion being disposed between the smooth conical lower end portion and the non-circular portion. A dental post characterized by the following. 2. The dental post according to claim 1, wherein the non-circular portion has a rectangular shape. 3. A fourth member for providing strength to the post body to withstand bending and shearing forces acting on a dental restoration, the fourth member being between the threaded portion and the non-circular portion. The dental post according to claim 1, wherein said non-threaded portion has a diameter equal to the diameter of the larger side of said threaded portion. 4. An engagement member disposed at a root stock and disposed at a top free end of the post body for matingly engaging a support frame spanning an upper portion of the dental post, the engagement member comprising: The dental post according to claim 1, wherein the mating member includes a chisel-shaped portion. 5. A tapered portion having a reduced thickness toward the chisel-shaped portion is disposed between the chisel-shaped portion and the non-circular portion, and the chisel-shaped portion. 5. The dental implant of claim 4 extending across the longitudinal axis of the post body to provide a laterally extending cusp top edge having a length equal to the maximum width of the non-circular portion. post. 6. A support frame for holding a dental reduction material to a prepared root stock having a tube therein, a pair of opposed first and second for straddling the top of a dental post. A leg, a bent portion coupled to the first and second legs together, an opening member extending into the bent portion to receive an upper portion of the dental post therethrough, and an upper portion of the dental post Engage the upper portion of the dental post to catch and mate the support frame and dental post together after being inserted through the opening member and the dental post rotated 90 degrees relative to the flexure In order to do so, the support frame is configured with a shoulder member provided on the bent portion on opposite sides of the opening member. 7. The support frame of claim 6, wherein the bent portion has an apex so as to give the support frame a V-shape. 8. A pad member is provided at a lower end of the leg laterally aligned with the leg for seating on a step provided in a root stump adjacent to a dental canal. The support frame according to claim 6. 9. The support frame of claim 6, wherein a longitudinally elongated slot is provided in each of the legs to bifurcate the legs. 10. Each forked leg portion of each of the legs is in a fixed rotational position to provide a reinforced leg structure for each of the legs to prevent lateral bending thereof. The support frame according to claim 9, wherein the support frame is twisted. 11. A dental post and support frame assembly for retaining a dental reduction material on a prepared root stock having a tube therein, the dental post for insertion into a dental canal. An elongated body having a lower first end portion and an opposite upper second end portion, the support frame including a pair of opposed first and second straddles for straddling an upper portion of the dental post. Legs and the first
And a bent portion coupled together to the second leg, the support frame cooperating with a second end portion of the dental post to capture and engage the support frame and the dental post together. And an engagement member for providing the assembly. 12. The engagement member has an opening member extending into the bent portion to receive the second end portion therethrough, the second end portion being inserted through the opening member and the dental implant. 12. The post comprises a shoulder member on opposite sides of the opening member for engaging the underside of the second end portion after the post is rotated 90 degrees with respect to the bent portion. The described assembly. 13. The second end portion has a barb-like structure extending transversely to the longitudinal axis of the post body to provide a laterally extending cusp top edge. Item 12. The assembly according to item 12. 14. A tapered portion of the post body is disposed adjacent to the second end portion, the tapered portion reduced at the second end portion to catch a bend thereon. 2. The thickness is reduced towards the second end portion to provide a thickness portion.
3. The assembly according to item 3. 15. The assembly of claim 11, wherein the lower first end portion has a smooth conical shape to fit snugly against a dental canal. 16. The first member, wherein the post body coacts with an immobilizing material to prevent the dental post from being pulled out of the dental canal and also to allow the dental post to be retrieved from the dental canal. And the first member comprises a threaded portion that engages the fixation material while the threaded portion can be rotated out of the fixation material to remove the dental post from the dental canal. 12. The set of claim 11, wherein the post body also includes a second member for facilitating rotation of the threaded portion to disengage from the fixation material, the second member being a non-circular portion. Three-dimensional. 17. The assembly of claim 16, wherein the non-circular portion has a rectangular shape and the second end portion has a lateral length equal to a diagonal of the non-circular portion. 18. The assembly of claim 11, wherein the bent portion has an apex so as to provide the support frame with a V-shape. 19. A pad member is provided at the lower end of the leg in lateral alignment with the leg for seating on a step provided on the root stump adjacent to the dental canal. 11. The assembly according to item 11. 20. A longitudinally extending elongated slot is provided in each of the legs to bifurcate the legs, each bifurcated leg portion of each of the legs having laterally extending legs. 12. The assembly of claim 11, wherein the assembly is twisted into a rotational position to provide a reinforced leg structure on each of the legs to prevent bending.