JPS6215220B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When installing a prosthetic pin in a root canal to support a prosthetic member during pulp prosthesis, it is important to create a sterile environment for root canal treatment and subsequent work. Furthermore, it is important to prevent cracks and damage to the root canal.

The present invention relates to a novel pulp prosthesis device that achieves therapeutic purposes, is protected from bacteria, and is safe in use.

In recent years, root canal therapy has been widely adopted as a method for preserving teeth that should be extracted. There are problems with the method of reinforcing endodontically treated teeth to make them useful members in the mouth, which limits the adoption of root canal therapy. Reinforcing the treated tooth is a surefire and safe method.
Reinforcement is considered essential when dentures are placed over teeth or used as supports. Preventing breakage is cheaper than replacing damaged teeth.
Teeth without pulp become brittle, and threaded pins often damage the root canal. Correctly fitted pins tend to create lateral forces when cemented. Examples of literature documenting these issues include:
“Endodontic research on endodontic reinforcement” Sapon and Lorenki; The Journal of Prosthetic Dentistry, Vol. 45, No. 2, 1981
, “In vitro analysis of self-shear retaining pins” Collard, Caputo, Standley, Duncanson;
The Journal of Prosthetic Dentistry, Volume 45, No. 2, 1981.

When performing endodontic therapy, care must be taken to avoid pushing bacterial showers into the tooth root foramen during mechanical work. The root canal surface must be thoroughly sterilized to prevent toxicity to surrounding tissues. It is known that if the root canal surface is sterilized and the root canal is replaced, the damaged surrounding bone will be repaired, and a tooth without pulp will no longer be harmful to health. Use rubber dams to maintain sterile working techniques. This method is known to be the only safety measure to prevent bacterial contamination by saliva. The current method of using a rubber dam insulates the entire tooth with the root canal being treated and then injures the surrounding gingiva when installing the rubber dam clamp.

The present invention solves both of the above-mentioned problems, namely, preventing damage to the tooth root including the root canal to be treated and preventing bacterial contamination of the root canal, and provides a pulp prosthesis method that achieves the therapeutic purpose and is safe when used. do. Generally speaking, the present invention uses a grommet-type mouthpiece that is mounted within a hole larger than the root canal formed at the entrance of the root canal. The root canal is treated from within the hole of the mouthpiece to allow attachment of the prosthetic pin. The sterile dam is attached to the outer periphery of the grommet-type mouthpiece to insulate only the root canal; there is no need to insulate the entire tooth, and the surrounding gingiva is not harmed during the clamping procedure. Once the root canal treatment is complete, prosthetic pins are installed inside the mouthpiece, which reinforces the tooth and prevents it from breaking. During the root canal treatment, a temporary plug is attached to the mouthpiece before the prosthetic component is attached to keep the root canal sterile and the operation can be interrupted.

According to the present invention, there is provided a grommet-like mouthpiece used when treating the root canal of a tooth for pulp prosthesis, the outer diameter being larger than the diameter of the root canal and the length in the axial direction being equal to the depth of the root canal. a tubular body of solid material covering an entrance aperture of larger diameter than the root canal formed at the entrance of the root canal as a small part of the root canal, the inner diameter of the tubular body being substantially equal to the inner diameter of the root canal; and a flanged collar on the outer periphery of the end portion remaining outside the entrance hole when the cap is installed in the entrance hole, the flanged collar having a hole aligned with the inner diameter hole of the tubular body. an annular recess for receiving and retaining a sterile dam, such that the sterile dam covers the tooth and the surrounding gingiva and passes through the hole and the inner diameter hole of the mouthpiece into the root canal. A grommet-like base for a pulp prosthesis, characterized in that a clamping device is provided for engaging the underside of the flanged collar to hold the sterile dam in place. provided.

Further, according to the present invention, there is provided a grommet type cap used for treating the root canal of a tooth for pulp prosthesis of the tooth, and a prosthetic pin to be installed in the root canal; the grommet type cap has an outer diameter. A solid material whose axial length is larger than the diameter of the root canal and whose axial length is a small portion of the depth of the root canal, covering the entrance hole with a diameter larger than the root canal formed at the entrance of the root canal and supporting the dentin material surrounding the entrance hole. a tubular body, the inner diameter of the tubular body being substantially equal to the inner diameter of the root canal to allow access to the root canal through the inner diameter hole; the prosthetic pin fitting into the inner diameter hole of the tubular body to a support for supporting a prosthetic pin within a grommet-type base; a device for supporting an extracoronal prosthetic component; and an intra-root canal portion extending from the support into the root canal to a predetermined depth below the grommet-type base. Provided is a grommet-type base and prosthetic pin combination device characterized by having the following features.

Embodiments and drawings illustrating the present invention will be described.

FIG. 1 shows a grommet-type mouthpiece according to the present invention, which is structured to fit into the entrance portion 12 of a root canal 14 shown in FIG. The teeth 16 are ground down to a surface 18 equal to the height of the surrounding teeth 20. The entrance portion 12 is bored to a diameter larger than the root canal 14 using a special tool 22 shown in FIG. With this tool,
A slope portion 24 is formed on the outer edge of the inlet portion 12 using a slope clinder 24'. The body of the tool grinds the inlet section 12 to the required diameter. The bottom blade 28 grinds a shelf at the bottom of the inlet section. A smooth tool centering guide 30 fits within the root canal 14 to center the tool and provide guidance when widening the entrance portion 12.

The grommet-type base 10 serves as a sleeve and contacts the inlet portion 12. When the sleeve is fully seated in the inlet section 12, the outer end band 34 is at the beveled portion 24.
come into contact with. A self-tapping screw 36 can also be provided on the outer surface 32 of the sleeve, by means of which the mouthpiece 10 can be screwed into the entrance 12 of a root canal.

The grommet type cap 10.1 shown in FIGS. 4 and 5 is similar to the cap 10 shown in FIG. 1, but without the flared band 34. The inner surface 38 is smooth, but the first
In the example shown in Figures 1 and 12, an internal thread is formed on the inner surface. A slot 40 in the outer edge engages a screwdriver. A similar screwdriver receiver can also be provided in the cap shown in FIG.

The grommet type mouthpiece 10 shown in FIG. 6 has a collar 42 and a ring 44 extending outward from the outer end of the collar attached to the outer peripheral edge, and a sterile dam shown in FIG. 10 is placed below this at the entrance of the root canal 14. Hold. The collar 42 has a hexagonal outer circumference, for example as shown in FIG. 8, and cooperates with a clamp shown in FIG. 9th A
The figure shows another embodiment of a clamp 48 in which two U-shaped wire members 52, 54 are assembled into a knotted, adjustable loop to surround the collar 42.

As shown in FIG. 7, an internal thread is cut in the outer end of the grommet-type base 10, and a dam retainer 56 is removably attached. Retainer 56 has a circular collar 58 screwed onto the base and an flared ring 60. For example, a small hole 64 in a sterile dam 62 made of rubber.
is provided and screwed into the cap 10 through the collar 58 to hold the dam 62 between the flared end 34 and the flare ring 60.

As shown in FIG. 10, when the retainers 42 and 44 shown in FIG. 6 are fixed to the base 10, the dam 6
2 is held on the tooth passed over the ring 44 and clamped with a clamp 46 shown in FIG. In the case of FIG. 10 or FIG. 7, the root canal is held by a retainer attached to the base 10, insulating the root canal from the external surface 18 of the tooth and the surrounding tissue 20. There is no need to insulate all teeth, and there is no need to involve the surrounding gingiva during the clamping procedure. Attached cap 10 or 10.
1 mechanically protects the surrounding tissue. The root canal 14 is treated and a removable seal or cap (not shown) is fitted as a temporary plug to protect the root canal from contamination and to maintain its sterility during interruptions in the prosthetic procedure. After the root canal has been treated, the prosthesis post and the like are held in the desired position within the root canal using the cap.

Figures 11 and 11A show a prosthetic pin 70 for use in practicing the present invention. This pin 70 includes an intracanal pin 72 that is installed in the root canal 12, and a support member 74 that has an external thread that is screwed into the internal thread of the mouthpiece 80.
and an extravascular portion 76 shown with the required displacement sleeve 78 attached thereto. The pin 70 is provided with air vent grooves 71 and 73 and a depth gauge groove 75. Top seal portion 77 extending to support member 74
is provided so that the seal portion seats on the flared band portion of the cap 80 when the support member is fully screwed into the cap. A self-tapping screw is provided on the outer surface of the cap 80 to enable it to be screwed into the dentin of a tooth similar to the cap 10 shown in FIG. Internal threads 82 engage threads in support member 74 of pin 70, thus
is fixed in the root canal 14 shown in FIG. The opening in the root canal is sealed with a top seal 77. The completed drawing is shown in Fig. 14. Prosthesis can be placed outside the tube as required7
Form on 6. Transposition sleeve 78 as required
It is also easy to use.

According to the invention, the grommet-like base used to support the prosthetic pin can be made of any desired material. The cap 90 shown in FIG. 13 is made of a simple sleeve made of ceramic or the like, has a rough surface, and is provided with external and internal threads. This sleeve is the entrance part 1 of the root canal 14.
2 and cement the prosthetic pin to it. This sleeve facilitates the use of the core paste prosthesis and increases the strength of the crown or jacket supported on the prosthesis.

The mouthpiece 10 shown in FIG. 14 has a smooth inner surface and supports the prosthetic pin 90 within the root canal 14, but does not secure it. Although no external threads are shown on the cap 10, external threads may be provided if desired. The lower end of the pin 90 is provided with an endoluminal portion having a screw 92 that screws into the dentin. Support body 94 is unthreaded on its exterior surface and slides into fit within base 10 and is cemented as desired. The top seal part 96 is screwed into the pin 9.
When screwed in by 2, the expanding band portion 34
come into contact with. Extravascular portion 98 supports the prosthetic component.

The pin 90 has an axial hole 97 extending from the extracanal portion 98 through the support body 94 to the bottom of the root canal 14 in the intracanal portion. This hole is used to ensure retention, for air venting, and for treatment purposes.
Inner tube portion 91 is made of a light transmitting material or holes 97
A light-activated material, such as a UV-cured dental material, can be used to form a solid seal at the root canal floor and secure the prosthetic pin within the root canal. screw 9
2 engages within this seal or screws into the dentin.

The present invention can also be a grommet-type cap combined with a sleeve for attaching a retainer for a sterilization dam. By attaching the ferrule to the specially formed entrance of the root canal, the retainer extends outward from the tooth to hold the dam, such as a rubber one, and to avoid damaging the surrounding teeth while clamping the rubber dam. Never. The root canal can be treated after the sleeve and dam are installed, and the sleeve and dam keep the surgical area sterile without causing unnecessary damage to the surrounding teeth. After completion or partial completion of the required procedure, a temporary plug is removably attached to the sleeve for termination or protection during the procedure. Several embodiments are possible for completing the prosthesis. The retainer can be left in place and used as a root anchor with or without pins. As another example, the pin may be secured to the sleeve by screws or the like, and the retainer may be left in place or removed. Although one example is shown as an example, the other method may also be used, and a self-hardening paste material can be used.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a grommet type cap according to the present invention;
Figure 2 is a view of the root canal of a tooth treated so that the mouthpiece of Figure 1 can be attached to it, Figure 3 is a view of a tool for treating the entrance of the root canal in Figure 2, and Figure 4 is a view of another tool. Figure 5 is a cross-sectional view of Figure 4, Figure 6 is a diagram of a base with a sterile dam retainer attached, Figure 7 is a diagram of another base with a removable sterile dam retainer attached, Figure 8 is a cross-sectional view taken along line 8-8 in Figure 6, and Figure 9 is a cross-sectional view along line 8-8 in Figure 6.
Figure 9A is a diagram of another embodiment of the clamp;
Figure 0 is a diagram of the base of Figure 6 attached to the root canal with a dam held at the entrance of the root canal, Figure 11 is a diagram of the prosthetic pin with a displacement sleeve according to the present invention, and Figure 12 is a prosthetic pin screwed into the base. , FIG. 13 is a diagram of another embodiment of the cap, and FIG. 14 is a diagram of the pin and the cap attached to the root canal. 10, 10.1, 80, 90... Grommet type mouthpiece, 14... Root canal, 16... Teeth, 22... Tool, 34... Expanding band, 40... Slot,
42...Color, 44...Spreading ring, 46,
48...Clamp, 56...Dam retainer, 60
...Expand ring, 62...Dam, 70,90...
...Prosthetic pin, 71, 73, 75...groove.

Claims (1)

[Scope of Claims] 1. A grommet-type mouthpiece used when treating the root canal of a tooth for pulp prosthesis, the outer diameter of which is larger than the root canal diameter and the axial length of which is equal to the depth of the root canal. a tubular body of solid material covering an entrance aperture of larger diameter than the root canal formed at the entrance of the root canal as a small portion of the canal; a flanged collar on the outer periphery of the end that remains outside the entrance hole when the mouthpiece is installed in the entrance hole, the flanged collar being aligned with the inner diameter hole of the tubular body; an annular recess for receiving and retaining a sterile dam having a sterile dam, so that the sterile dam covers the tooth and the surrounding gingiva of the tooth and passes through the hole and the inner diameter hole of the mouthpiece into a root canal. A grommet-type mouthpiece for pulp prosthesis, further comprising a clamp portion that engages with the lower surface of the flanged collar to hold the sterilization dam in a predetermined position. . 2. The grommet type mouthpiece for dental pulp prosthesis according to claim 1, wherein an external thread is provided on the outer tubular surface of the mouthpiece for screwing and fixing the mouthpiece into the entrance hole of the root canal. 3. The grommet-type cap for dental pulp prosthesis according to claim 2, which has a substantially smooth inner diameter hole. 4. A grommet-type cap for dental pulp prosthesis according to claim 2, wherein an internal thread is provided on the inner surface of the inner diameter hole. 5 Claim 2 in which the inner surface of the inner diameter hole is roughened
Grommet-type mouthpiece for dental pulp prosthesis as described in Section 1. 6. The sterilization dam is provided with the separate collar that can be threadedly engaged with the inner diameter hole, and by screwing the collar, the sterilization dam is held in alignment with the inner diameter hole. Grommet-type mouthpiece for dental pulp prosthesis in item 1. 7 Comprising a grommet-type mouthpiece used to treat the root canal of a tooth for pulp prosthesis, and a prosthetic pin to be installed in the root canal; the grommet-type mouthpiece has an outer diameter larger than the root canal diameter in the axial direction. a tubular body of solid material covering an entrance hole of a larger diameter than the root canal and supporting dentin material surrounding the entrance hole; The inner diameter of the tubular body is substantially equal to the inner diameter of the root canal to allow access to the root canal through the inner diameter hole; the prosthetic pin is fitted with the inner diameter hole of the tubular body to allow the prosthetic pin to be inserted into the grommet-type mouthpiece. a device for supporting an extracoronal prosthetic member; and an intraroot canal portion extending from the support portion into the root canal to a predetermined depth below the grommet-type mouthpiece. A device that combines a grommet-type mouthpiece and a prosthetic pin. 8. The grommet-type cap has a threaded inner diameter hole, the prosthetic pin has a thread corresponding to its outer periphery, and the depth at which the inner portion of the root canal penetrates into the root canal when the prosthetic pin is screwed into the grommet-type cap. 8. The combination device according to claim 7, wherein the height of the combination device is adjustable. 9. The combination device according to claim 7, wherein a device for engaging with the bottom of the root canal is provided at the tip of the intra-root canal portion of the prosthetic pin. 10. The combination device according to claim 9, wherein the tip is provided with a screw. 11. The support portion has no engagement device and is slidably fitted into the inner diameter hole of the tubular body of the grommet type cap.
A combination device according to claim 10. 12. The combination device according to claim 7, wherein at least the intraroot canal portion of the prosthetic pin is hollow in the axial direction. 13. Claim 7, wherein the prosthetic pin is transparent to light in a frequency range including at least the visible and ultraviolet bands.
Combination device as described in section.