WO1998004210A1 - Support de prothese - Google Patents

Support de prothese Download PDF

Info

Publication number
WO1998004210A1
WO1998004210A1 PCT/GB1997/002044 GB9702044W WO9804210A1 WO 1998004210 A1 WO1998004210 A1 WO 1998004210A1 GB 9702044 W GB9702044 W GB 9702044W WO 9804210 A1 WO9804210 A1 WO 9804210A1
Authority
WO
WIPO (PCT)
Prior art keywords
bore
prosthetic support
support
luting agent
prosthetic
Prior art date
Application number
PCT/GB1997/002044
Other languages
English (en)
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
Publication of WO1998004210A1 publication Critical patent/WO1998004210A1/fr

Links

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 prosthetic supports including but not necessarily exclusively supporting posts for dental crowns or bridges.
  • the fitting of a dental crown commonly requires several visits to the dentist, at least partly because the supporting post normally needs to be a close and accurate fit in the root.
  • the root canal is cleared out and then filled at its inner end, the canal is bored out to receive a post and a wax impression of the bore is taken.
  • This wax impression is sent to a dental laboratory for the post to be made and then, at a second visit, the post is cemented into the bore with a luting agent.
  • the luting agent takes time to cure, so taking an impression for the crown often has to be left to a third visit, and finally a fourth visit is required for the crown to be fitted.
  • light-curable composite luting agents such as an organic resinoid comprising Bis- GMA-adduct (adduct of 2,2-Bis[4-2(2-hydroxy-3-methacryloyloxypropoxyl)- phenyljpropane with hexamethylene diisocyanate), Bis-EMA (2,2-Bis[4-(2- methacryoyloxyethoxy)-phenyl]propane and TEGDMA (3,6-Dioxaoctamethylene- dimethacrylate) incorporating a proportion of particulate inorganic fillers.
  • Bis- GMA-adduct adduct of 2,2-Bis[4-2(2-hydroxy-3-methacryloyloxypropoxyl)- phenyljpropane with hexamethylene diisocyanate
  • Bis-EMA 2,2-Bis[4-(2- methacryoyloxyethoxy)-phenyl]propane
  • TEGDMA 3,6-
  • Such luting agent can be cured quickly under illumination so that the post can be fitted and the impression taken for the crown in the second visit.
  • the effective depth of illumination into such luting agents is limited to a few millimetres, so the retaining bore is undesirably short.
  • This problem can be overcome by use of an optical fibre associated with the post and allowing the luting agent to be illuminated from the inner end of the post as well as from the outer end of the bore, as described in Noone's UK Patent Application No 2 162 068A.
  • a preferred approach embodied in the present invention is to form the surface of the post from material which will cohere with the luting agent, eg the same material as the luting agent.
  • a prosthetic support comprising a core and an outer layer of resinoid material cured thereon so as to grip said core.
  • the resinoid material is cured on the core, it shrinks onto the core so as to grip it very firmly as well as adhering thereto.
  • the prosthetic support can be cemented in any required position using a luting agent of the same or otherwise chemically compatible resinoid material, but uncured, and curing said luting agent to secure the support in place. Because the luting agent is chemically compatible with the outer layer of the support, it will not shrink away from the support when it is itself cured.
  • the support may be used for supporting a dental crown or bridge or other prosthesis.
  • the core preferably comprises a strength member in the form of a tube made from surgical quality metal such as titanium.
  • the core may be roughened over its outer service further to enhance adhesion with the resinoid material.
  • the resinoid material may be light cured, in which case the core preferably includes means such as an optical fibre for transmitting light from one end of the support to the other.
  • the means for transmitting light may be removable to admit a reinforcing pin.
  • apparatus for fitting a prosthesis which apparatus comprises a support with an outer layer of cured resinoid material and a curable luting agent chemically compatible with said resinoid material.
  • the luting agent is preferably said resinoid material in uncured form. It may be light curable or self curing or a combination of the two (so-called 'dual cure' material).
  • a method of securing to a member a prosthetic support having an outer layer of cured resinoid material resinoid material comprises the steps of: - forming in said member a bore of transverse cross-section larger than that of the support;
  • the bore may be coated with a suitable bonding agent before the luting agent is inserted and is preferably undercut to retain the cured luting agent.
  • the bore may also be countersunk to provide a cushion of extra luting agent at its outer end.
  • Figure 1 is a cross-section of a prosthetic support according to the invention in the form of a post for supporting a dental crown;
  • Figure 2 is a schematic representation in cross-section of a tooth root prepared to receive the post shown in Figure 1;
  • a dental post 10 has a core comprising a titanium tube 12 and an optical fibre 14 of polytetrafluoroethylene therewithin.
  • the tube 12 has a chamfered end 16.
  • the optical fibre 14 extends substantially along the length of the tube 12 and has a small extension 18 at the end opposite from the chamfered end 16.
  • the tube 12 has an outer layer 20 of resinoid material cured on its outer surface.
  • This resinoid material is a visible-light activated radio-opaque fine particle hybrid composite conforming to ISO 4049-1988 and comprising a Bis-GMA-adduct (adduct of 2,2-Bis[4-2(2-hydroxy-3-methacryloyloxypropoxyl)-phenyl]propane with hexamethylene diisocyanate), Bis-EMA (2,2-Bis[4-(2-methacryoyloxyethoxy)- phenyljpropane and TEGDMA (3,6-Dioxaoctamethylene-dimethacrylate) together with 55% by volume particulate inorganic fillers (namely bariumaluminiurnborosilicate and highly dispersed silicon dioxide).
  • a Bis-GMA-adduct adduct of 2,2-Bis[4-2(2-hydroxy-3-methacryloyloxypropoxyl)-pheny
  • This material shrinks as it cures so as to grip the tube 12 as well as adhering to it, and adhesion may be further enhanced by roughening the outer surface of the tube 12 and/or by use of a bonding agent.
  • Other resinoid materials may be used provided that the filler content is not too high to inhibit curing and that said material grips said tube.
  • the post 10 may be made by injection moulding the uncured resinoid material around the core and then curing the resinoid material by radiation at an appropriate wavelength.
  • Figure 2 shows a tooth root 22 with the root canal cleared out and filled at its inner end 24. Above the filled portion a bore 26 has been formed in the root. The bore is about 8 mm deep and of somewhat greater transverse cross-section than the post 10. The bore 26 also includes an undercut 28 and a countersink 30. It may be noted that the bore 24 does not need to be precisely formed and can be formed with standard round burs.
  • the bore is coated with a bonding agent to secure or improve adhesion to the dentine.
  • a bead 32 of the same cured resinoid material as the layer 20 is placed at the bottom of the bore 26. (This step, which is optional, protects the filled portion 24 of the root canal against untoward pressure disturbance).
  • a luting agent of the same resinoid material, but uncured, is then injected into the bore 26 and the post 10 inserted chamfered end first so that the luting agent flows to fill the space between the post 10 and the bore 26, including the undercut 28, and overflow the countersink 30.
  • the outer surface is then illuminated as at 34 by means of a VLC polymerization unit so that the light penetrates some 4-5 mm down the space between the post 10 and the bore 26 to cure the luting agent there and, by way of the optical fibre 14, from the bottom of the post 10 to cure the remainder of the luting agent down to the bottom of the bore.
  • the post 10 is secured to the root 22 by cured luting agent 36 filling the bore 26 around the post 10. This cured luting agent is bonded within the bore 26 and also physically retained by means of the undercut 28.
  • the post 10 extends at 38 above the root 22 to receive a dental crown (not shown) which can readily be bonded thereupon.
  • Luting agent which has overflowed the countersink 30 has been trimmed to provide a shoulder 40 which cushions the post 10 in use.
  • the optical fibre 14 has been removed from the post 10 (by grasping the extension 18 shown in Figure 1) and optionally replaced by a titanium reinforcing pin 42 cemented in place.
  • a post as described above is inexpensive because it does not have to be custom-made in a laboratory, nor precisely fitted to the bore nor specially formed as with a taper and/or screw-thread or similar retention means. It can also be fitted quickly and easily, because the bore to receive it does not have to be especially precise.
  • the fitted post is exceptionally strong and secure: the titanium core is strong against lateral forces, which are cushioned by the shoulder; the luting agent bonded to the root coheres with the outer layer of the post to form a homogeneous mass; this outer layer of the post is a shrink fit on the core of the post as well as bonded to it; and the whole assembly is retained in place against longitudinal forces by means of the undercut as well as the bonding of the luting agent with the dentine wall of the bore.
  • Such a post can be fitted in a single visit to the dentist.
  • a dental crown of the same resinoid material as the layer and luting agent could be fitted in the same visit. It will also be appreciated that means similar to those described above may be used to secure a dental bridge or adapted to secure other prostheses.
  • the resinoid used to form the outer layer of the post does not need to be light- activated - for example, it may be a self-cure or dual-cure composite - provided it is cured so as to grip the core and the same or an otherwise chemically compatible resinoid is used to cement the post in place.

Landscapes

  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dental Prosthetics (AREA)
  • Dental Preparations (AREA)

Abstract

Un tenon radiculaire est composé d'un tube en titane (12) et d'une fibre optique (14) en polytétrafluoroéthylène s'étendant à l'intérieur dudit tube sensiblement le long dudit tube. Ce tube (12) possède une couche extérieure (20) en matériau résinoïde hybride en fines particules opaque à la radio, excité par la lumière visible et durci sur sa surface extérieure, de manière à se fixer au tube (12). On fixe le support (10) dans un perçage préparé dans une dent au moyen du même matériau résinoïde que la couche (20), on l'insère dans le perçage non durci et on le durcit en présentant de la lumière à l'extrémité dudit perçage, la fibre optique (14) assurant le durcissement sur la totalité de la longueur du perçage. Le matériau résinoïde dans le perçage s'unit à la couche (20) afin de constituer une masse homogène, ce qui crée un support solide qui peut être renforcé en remplaçant la fibre (14) par une broche en titane.
PCT/GB1997/002044 1996-07-31 1997-07-31 Support de prothese WO1998004210A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9616082.5 1996-07-31
GB9616082A GB2315676A (en) 1996-07-31 1996-07-31 Dental post with cured outer layer

Publications (1)

Publication Number Publication Date
WO1998004210A1 true WO1998004210A1 (fr) 1998-02-05

Family

ID=10797799

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/002044 WO1998004210A1 (fr) 1996-07-31 1997-07-31 Support de prothese

Country Status (2)

Country Link
GB (1) GB2315676A (fr)
WO (1) WO1998004210A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2392291B1 (fr) * 2010-06-01 2013-12-18 Coltène/Whaledent AG Supports dentaires

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5284443A (en) * 1992-08-28 1994-02-08 Coltene/Whaledent, Inc. Method of forming dental restorations
WO1996003936A1 (fr) * 1994-08-05 1996-02-15 Leonard Morris Spofforth Systeme de prothese dentaire

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4164794A (en) * 1977-04-14 1979-08-21 Union Carbide Corporation Prosthetic devices having coatings of selected porous bioengineering thermoplastics
US4684555A (en) * 1985-02-09 1987-08-04 Stefan Neumeyer Dental retention pins
KR890003069B1 (ko) * 1985-06-10 1989-08-21 구레하 가가꾸 고오교오 가부시끼가이샤 이식 물질
US4795475A (en) * 1985-08-09 1989-01-03 Walker Michael M Prosthesis utilizing salt-forming oxyacids for bone fixation
IL88170A0 (en) * 1988-01-21 1989-06-30 Compodent Research And Applic Novel dental post made of reinforced composite material
US5326264A (en) * 1993-01-05 1994-07-05 Raed Al Kasem Method to reinforce endodontically treated teeth and passive post

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5284443A (en) * 1992-08-28 1994-02-08 Coltene/Whaledent, Inc. Method of forming dental restorations
WO1996003936A1 (fr) * 1994-08-05 1996-02-15 Leonard Morris Spofforth Systeme de prothese dentaire

Also Published As

Publication number Publication date
GB9616082D0 (en) 1996-09-11
GB2315676A (en) 1998-02-11

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