WO1996003936A1 - Dental system - Google Patents

Dental system Download PDF

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Publication number
WO1996003936A1
WO1996003936A1 PCT/GB1995/001871 GB9501871W WO9603936A1 WO 1996003936 A1 WO1996003936 A1 WO 1996003936A1 GB 9501871 W GB9501871 W GB 9501871W WO 9603936 A1 WO9603936 A1 WO 9603936A1
Authority
WO
WIPO (PCT)
Prior art keywords
post
light
curable material
dental
optical fibre
Prior art date
Application number
PCT/GB1995/001871
Other languages
French (fr)
Inventor
Leonard Morris Spofforth
Original Assignee
Leonard Morris Spofforth
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Leonard Morris Spofforth filed Critical Leonard Morris Spofforth
Priority to AU31858/95A priority Critical patent/AU3185895A/en
Publication of WO1996003936A1 publication Critical patent/WO1996003936A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/225—Fastening prostheses in the mouth
    • A61C13/30—Fastening of peg-teeth in the mouth

Definitions

  • This invention concerns a dental system particularly for fitting crowns or bridges to teeth. Fitting of crowns or bridges to teeth usually requires at least two visits to a dentist. To fit a crown using a conventional post usually requires four visits. At the first visit the tooth cavity is prepared and a wax impression taken for the post. At the second visit, the post is fitted but as the cement used takes time to set, no impression for the crown can be taken. At the third visit the post is trimmed and an impression taken for the crown and at the fourth visit the crown is fitted. Thus, the process is very time consuming. When a post is fitted to a tooth to take a crown or bridge, the cementing in of the post can be a weak point. The post has to be a tight fit into the root of the tooth, so that only a very thin layer of cement is used. An object of this invention is to provide an improved system for fitting crowns or bridges to teeth.
  • a dental post made of a light curable material and having a means for transmitting light from its intended outer end to its other end.
  • a method of fitting a dental post comprising the following steps: forming a cavity in a tooth root of greater diameter than the post to be fitted; inserting light curable material into the cavity; putting a dental post made of light curable material having means for transmitting light from its intended outer end to its other end; shining light onto the post, whereby the light curable material around the top of the post is cured directly and the light transmitting means transmits the light to the base of the post to cure the light curable material there.
  • the light curable material from which the post is made and the light curable material for fixing the post are preferably the same material, so that upon curing a homogeneous may be formed.
  • the post contains an optical fibre having a first end and second end, the first end being substantially coterminous with the intended outer end of the post and the second end being near to the other end of the post.
  • the optical fibre preferably extends at least three quarters of the length of the post.
  • the optical fibre is preferably contained over a substantial part of its length in a reinforcing sleeve, preferably or metal, such as, for example of brass, stainless steel, titanium or a titanium alloy, with the proviso that the second end of the optical fibre is beyond the sleeve in the post.
  • the optical fibre may be of any suitable material, although a flexible material is preferred such as, for example, polytetrafluroethylene.
  • the post is preferably moulded from a light curable polymer, such as a curable urethane or a glass ionomer cement.
  • a preferred material, also known as radio-opaque resin based dental restorative material, is urethane modified BIS-GMA (cyclodi-2, 2-bis ((4-[3- methacryloxy -2-(l, 12-dioxa-2,ll-dioxo-3,10- diazododecane) propoxyl] phenyl)) propane.
  • the reinforcing sleeve is preferably roughened over its outer surface to promote adhesion with the light curable material.
  • the post preferably has a tapered other end.
  • light curable is intended to include materials that are curable by visible and/or invisible light.
  • any root canal be filled and that preferably the root filling is protected before the light curable cement is inserted.
  • the root filling is preferably protected by a bead or the like of light-curable material. Then the bead may become part of the homogeneous mass upon curing of the cement.
  • the cavity formed in the tooth root may be of greater diameter than is needed for the post to be a tight fit therein.
  • one or more undercuts are formed in the wall of the cavity, so that the light curable material can enter an undercut and make it more difficult for the post to be pulled out of the root after curing of the material.
  • the top of the root is preferably given a saucer shape around the cavity, so that the crown bearing part of the post is given additional support by the extra thickness of cured material in the saucer.
  • the light curable material may shrink slightly on curing but this may be overcome by applying pressure to the post during curing.
  • an impression for a crown can be taken and then a prepared crown can be fitted onto the post.
  • FIG. 1 shows a dental post according to the invention
  • Figure 2 shows a root in section prepared for receiving the dental post of Figure 1;
  • Figure 3 is a perspective view of the root of Figure 2;
  • Figure 4 shows the post of Figure 1 fitted to the root of Figures 2 and 3; and
  • Figure 5 shows the post of Figure 1 fitted to the root of Figures 2 and 3 with a crown in place.
  • a dental post 10 is made of a light curable material, such as a radio-opaque resin-based dental restorative material, for example, urethane modified
  • the post 10 is generally circular in section and is tapered at its end which will enter a tooth root. Internally, the post 10 has an optical fibre 12, such as of polytetrafluroethylene, running down its centre but short of the tapered end of the post. Over most of its length the optical fibre is inside a metal tube 14, such as of stainless steel, titanium or brass. The tube 14 has its outer surface roughened to promote adhesion of the resin material of the post.
  • the post 10 is made by a moulding process, preferably an injection moulding process. The optical fibre and its metal casing are pushed into the moulded resin before it cures.
  • Figures 2 and 3 of the drawings show a tooth root 20 prepared to receive the post 10 of Figure 1.
  • a cavity 22 is drilled in the root tapering down to root canal 24.
  • the cavity 22 is widened a short distance above the root canal and an undercut 26 is formed midway along the cavity 22.
  • the cavity 22 is then cut back at its open end to form a saucer 28 around the bore.
  • the root 24 is filled.
  • a post 10 is fitted to the root 20 prepared as shown in Figures 2 and 3 as follows. Firstly, a bead 30 of the same cured material as the post, is put into the base of cavity 22 to prevent pressure disturbance of the root filling. The cavity 22 is then partially filled with uncured light sensitive composition 32. The post 10 is inserted into the cavity which action squeezes excess uncured composition into the undercut 26 and out of the top of the root. At the top of the root excess composition is trimmed to form a shoulder 34.
  • a curing light is then shone onto the top of the root which cures the light sensitive composition in the top part of the root.
  • the optical fibre 12 carries the curing light down the post to cure the composition in the lower part of the cavity 22. Because the post 10, the bead 30 and the light sensitive curable composition are all of the same material, when the composition hardens, they become a substantially homogeneous mass. Therefore, as composition has cured into the undercut, it prevents the post being pulled out of the cavity.
  • the above described method has a number of advantages.
  • the post is cheaper to produce and the whole process of crowning is quicker. Once the post is fitted and cured an impression for a crown can be taken and the crown fitted on the next visit to the dentist.
  • the undercut in the cavity can prevent loss of the post.
  • the post is bonded to the tooth structure. Other systems are cemented and this is a weak point. Composite crowns can easily be added to ' the post which will make an inexpensive crown system without loss of quality.

Abstract

A dental post (10) is made of a light-curable material and contains an optical fibre (12) for transmitting light through the post to light-curable adhesive (32) in a cavity (22) to which the post is being fitted.

Description

TITLE: Dental System
DESCRIPTION
This invention concerns a dental system particularly for fitting crowns or bridges to teeth. Fitting of crowns or bridges to teeth usually requires at least two visits to a dentist. To fit a crown using a conventional post usually requires four visits. At the first visit the tooth cavity is prepared and a wax impression taken for the post. At the second visit, the post is fitted but as the cement used takes time to set, no impression for the crown can be taken. At the third visit the post is trimmed and an impression taken for the crown and at the fourth visit the crown is fitted. Thus, the process is very time consuming. When a post is fitted to a tooth to take a crown or bridge, the cementing in of the post can be a weak point. The post has to be a tight fit into the root of the tooth, so that only a very thin layer of cement is used. An object of this invention is to provide an improved system for fitting crowns or bridges to teeth.
According to one aspect of the invention there is provided a dental post made of a light curable material and having a means for transmitting light from its intended outer end to its other end.
According to a second aspect of this invention there is provided a method of fitting a dental post comprising the following steps: forming a cavity in a tooth root of greater diameter than the post to be fitted; inserting light curable material into the cavity; putting a dental post made of light curable material having means for transmitting light from its intended outer end to its other end; shining light onto the post, whereby the light curable material around the top of the post is cured directly and the light transmitting means transmits the light to the base of the post to cure the light curable material there.
The light curable material from which the post is made and the light curable material for fixing the post are preferably the same material, so that upon curing a homogeneous may be formed. In a preferred embodiment of the invention, the post contains an optical fibre having a first end and second end, the first end being substantially coterminous with the intended outer end of the post and the second end being near to the other end of the post. The optical fibre preferably extends at least three quarters of the length of the post. The optical fibre is preferably contained over a substantial part of its length in a reinforcing sleeve, preferably or metal, such as, for example of brass, stainless steel, titanium or a titanium alloy, with the proviso that the second end of the optical fibre is beyond the sleeve in the post.
The optical fibre may be of any suitable material, although a flexible material is preferred such as, for example, polytetrafluroethylene. The post is preferably moulded from a light curable polymer, such as a curable urethane or a glass ionomer cement. A preferred material, also known as radio-opaque resin based dental restorative material, is urethane modified BIS-GMA (cyclodi-2, 2-bis ((4-[3- methacryloxy -2-(l, 12-dioxa-2,ll-dioxo-3,10- diazododecane) propoxyl] phenyl)) propane.
The reinforcing sleeve is preferably roughened over its outer surface to promote adhesion with the light curable material. The post preferably has a tapered other end.
The term "light curable" is intended to include materials that are curable by visible and/or invisible light.
It is preferred that in the method of the invention any root canal be filled and that preferably the root filling is protected before the light curable cement is inserted. The root filling is preferably protected by a bead or the like of light-curable material. Then the bead may become part of the homogeneous mass upon curing of the cement. The cavity formed in the tooth root may be of greater diameter than is needed for the post to be a tight fit therein. Preferably one or more undercuts are formed in the wall of the cavity, so that the light curable material can enter an undercut and make it more difficult for the post to be pulled out of the root after curing of the material.
The top of the root is preferably given a saucer shape around the cavity, so that the crown bearing part of the post is given additional support by the extra thickness of cured material in the saucer.
The light curable material may shrink slightly on curing but this may be overcome by applying pressure to the post during curing.
Once the light curable material has been cured, an impression for a crown can be taken and then a prepared crown can be fitted onto the post.
This invention will now be further described, by way of example only, with reference to the accompanying drawings, in which:- Figure 1 shows a dental post according to the invention; Figure 2 shows a root in section prepared for receiving the dental post of Figure 1;
Figure 3 is a perspective view of the root of Figure 2; Figure 4 shows the post of Figure 1 fitted to the root of Figures 2 and 3; and
Figure 5 shows the post of Figure 1 fitted to the root of Figures 2 and 3 with a crown in place.
Referring to Figure 1 of the accompanying drawings, a dental post 10 is made of a light curable material, such as a radio-opaque resin-based dental restorative material, for example, urethane modified
BIS-GMA (Cyclodi -2, 2- bis ((4-[3-methacryloxy -2-(1,12
-dioxa -2, 11- dioxo -3,1-diazododecane) propoxyl] phenyl)) propane. The post 10 is generally circular in section and is tapered at its end which will enter a tooth root. Internally, the post 10 has an optical fibre 12, such as of polytetrafluroethylene, running down its centre but short of the tapered end of the post. Over most of its length the optical fibre is inside a metal tube 14, such as of stainless steel, titanium or brass. The tube 14 has its outer surface roughened to promote adhesion of the resin material of the post. The post 10 is made by a moulding process, preferably an injection moulding process. The optical fibre and its metal casing are pushed into the moulded resin before it cures.
Figures 2 and 3 of the drawings show a tooth root 20 prepared to receive the post 10 of Figure 1. Firstly, a cavity 22 is drilled in the root tapering down to root canal 24. The cavity 22 is widened a short distance above the root canal and an undercut 26 is formed midway along the cavity 22. The cavity 22 is then cut back at its open end to form a saucer 28 around the bore. Finally the root 24 is filled.
Turning to Figures 4 and 5, a post 10 is fitted to the root 20 prepared as shown in Figures 2 and 3 as follows. Firstly, a bead 30 of the same cured material as the post, is put into the base of cavity 22 to prevent pressure disturbance of the root filling. The cavity 22 is then partially filled with uncured light sensitive composition 32. The post 10 is inserted into the cavity which action squeezes excess uncured composition into the undercut 26 and out of the top of the root. At the top of the root excess composition is trimmed to form a shoulder 34.
A curing light is then shone onto the top of the root which cures the light sensitive composition in the top part of the root. The optical fibre 12 carries the curing light down the post to cure the composition in the lower part of the cavity 22. Because the post 10, the bead 30 and the light sensitive curable composition are all of the same material, when the composition hardens, they become a substantially homogeneous mass. Therefore, as composition has cured into the undercut, it prevents the post being pulled out of the cavity.
Finally a crown 36 is adhered to the post 10 (Figure 5) .
The above described method has a number of advantages. The post is cheaper to produce and the whole process of crowning is quicker. Once the post is fitted and cured an impression for a crown can be taken and the crown fitted on the next visit to the dentist. The undercut in the cavity can prevent loss of the post. The post is bonded to the tooth structure. Other systems are cemented and this is a weak point. Composite crowns can easily be added to' the post which will make an inexpensive crown system without loss of quality.

Claims

CLAIMS 1. A dental post made of a light curable material and having means for transmitting light from its intended outer end to the other end.
2. A dental post as claimed in claim 1 containing an optical fibre having a first end and a second end, the first end being substantially co-terminous with the intended outer end of the post and the second end being near to the other end of the post.
3. A dental post as claimed in claim 2, wherein the optical fibre extends at least three quarters of the length of the post.
4. A dental post as claimed in claims 2 or 3, wherein the optical fibre is contained over a substantial part of its length in a reinforcing sleeve, with the second end of the fibre beyond the sleeve in the post.
5. A dental post as claimed in claim 4, wherein the reinforcing sleeve is of metal.
6. A dental post as claimed in claim 5, wherein the reinforcing sleeve is of a material selected from brass, stainless steel, titanium or titanium alloy.
7. A dental post as claimed in claims 4, 5 or 6, wherein the reinforcing post has a roughened outer surface.
8. A dental post as claimed in any one of claims 2 to 7, wherein the optical fibre is of polytetrafluroethylene.
9. A dental post as claimed in any one of claims 1 to 8, wherein the light curable material is selected from curable urethanes and glass ionomer cements.
10. A dental post as claimed in any one of claims 1 to 9, which the light curable material is urethane modified BIS-GMA (cyclodi-2, 2-bis ( (4-[3-methacryloxy- 2-(l, 12-dioxa-2,ll-dioxo-3,10-diazododecane) propozyl] phenyl)) propane.
11. A dental post as claimed in any one of claims 1 to 10 having its other end tapered.
12. A method of fitting a dental post comprising the following steps: forming a cavity in a tooth root of greater diameter than the post to be fitted; inserting light curable material into the cavity; putting a dental post made of light curable material having means for transmitting light from its intended outer end to its other end; shining light onto the post, whereby the light curable material around the top of the post is cured directly and the light transmitting means transmits light to the base of the post to cure the light curable material there.
13. A method as claimed in claim 12, wherein the light curable material from which the post is made and the light curable material for fixing the post are the same.
14. A method as claimed in claims 12 or 13, wherein the dental post contains an optical fibre having a first end and a second end, the first end being substantially co-terminous with the intended outer end of the post and the second end being near to the other end of the post.
15. A method as claimed in claim 14, wherein the optical fibre extends at least three quarters of the length of the post.
16. A method as claimed in claims 14 or 15, wherein the optical fibre is contained over a substantial part of the length in a reinforcing sleeve, with the second end of the fibre beyond the sleeve in the post.
17. A method as claimed in claim 16, wherein the reinforcing sleeve is of metal.
18. A method as claimed in claim 17, wherein the reinforcing sleeve is of a material selected from brass, stainless steel, titanium or titanium alloy.
19. A method as claimed in claims 16, 17 or 18, wherein the reinforcing post has a roughened outer surface.
20. A method as claimed in any one of claims 12 to 19, wherein the optical fibre is of polytetrafluroethylene.
21. A method as claimed in any one of claims 12 to 20, wherein the light curable material is selected from curable urethanes and glass ionomer cements.
22. A method as claimed in any one of claims 12 to 21, wherein the light curable material is urethane modified BIS-GMA (cyclodi-2, 2-bis ( (4-[3-methacryloxy- 2-(l, 12-dioxa-2,ll-dioxo-3,10-diazododecane) propozyl] phenyl) ) propane.
23. A method as claimed in any one of claims 12 to 22, wherein the dental post has its other end tapered.
24. A method as claimed in any one of claims 12 to 23 including the step of filling the root canal, if necessary.
25. A method as claimed in any one of claims 12 to 24 further including the step of protecting a root filling, if present.
26. A method as claimed in claim 25, wherein the root filling is protected by a bead or the like of light- curable material.
27. A method as claimed in any one of claims 12 to 26, wherein the cavity formed in the tooth has one or more undercuts in its wall.
28. A method as claimed in any one of claims 12 to 26, wherein the top of the root is given a saucer shape around the cavity.
29. A method as claimed in any one of claims 12 to 28, wherein pressure is applied to the post during curing of the light-curable material.
30. A dental post substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
31. A method of fitting a dental post substantially as hereinbefore described with reference to the accompanying drawings.
PCT/GB1995/001871 1994-08-05 1995-08-07 Dental system WO1996003936A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU31858/95A AU3185895A (en) 1994-08-05 1995-08-07 Dental system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9415896A GB9415896D0 (en) 1994-08-05 1994-08-05 Dental system
GB9415896.1 1994-08-05

Publications (1)

Publication Number Publication Date
WO1996003936A1 true WO1996003936A1 (en) 1996-02-15

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ID=10759481

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/001871 WO1996003936A1 (en) 1994-08-05 1995-08-07 Dental system

Country Status (3)

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AU (1) AU3185895A (en)
GB (1) GB9415896D0 (en)
WO (1) WO1996003936A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998004210A1 (en) * 1996-07-31 1998-02-05 Leonard Morris Spofforth Prosthetic support

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400160A (en) * 1981-11-06 1983-08-23 Leopold Paul Lustig Atraumatic endodontic reconstruction system and process
GB2162068A (en) * 1984-07-26 1986-01-29 Robert Noone Tooth dowel
WO1988005652A1 (en) * 1987-02-04 1988-08-11 Dental Composite Ltd. Preparation of novel dental composites incorporating fluorosilicate glass fillers
EP0391619A2 (en) * 1989-04-06 1990-10-10 Den-Mat Corporation Dental cements
US5151453A (en) * 1989-04-06 1992-09-29 Den-Mat Corporation Light-curable ionomer dental cement
US5176951A (en) * 1990-01-30 1993-01-05 Rudo David N Reinforced dental appliances and prostheses

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400160A (en) * 1981-11-06 1983-08-23 Leopold Paul Lustig Atraumatic endodontic reconstruction system and process
GB2162068A (en) * 1984-07-26 1986-01-29 Robert Noone Tooth dowel
WO1988005652A1 (en) * 1987-02-04 1988-08-11 Dental Composite Ltd. Preparation of novel dental composites incorporating fluorosilicate glass fillers
EP0391619A2 (en) * 1989-04-06 1990-10-10 Den-Mat Corporation Dental cements
US5151453A (en) * 1989-04-06 1992-09-29 Den-Mat Corporation Light-curable ionomer dental cement
US5176951A (en) * 1990-01-30 1993-01-05 Rudo David N Reinforced dental appliances and prostheses

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998004210A1 (en) * 1996-07-31 1998-02-05 Leonard Morris Spofforth Prosthetic support

Also Published As

Publication number Publication date
GB9415896D0 (en) 1994-09-28
AU3185895A (en) 1996-03-04

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