Dentistry – Method or material for testing – treating – restoring – or... – Crown
Reexamination Certificate
1999-03-29
2001-02-13
Wilson, John J. (Department: 3732)
Dentistry
Method or material for testing, treating, restoring, or...
Crown
C433S221000
Reexamination Certificate
active
06186791
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to endodontic posts and pins and more specifically to endodontic posts and pins fabricated of fiber reinforced composite material.
BACKGROUND OF THE INVENTION
Conventional endodontic posts are typically fabricated of metals or metal alloys. The metallic posts fabricated of less noble alloys can cause electrochemical corrosion and weaken the restoration. In the natural tooth, the elastic modulus of dentin in the crown portion is about 20 GPa, and at root portion is about 9 to 10 GPa. The mismatch of the elastic moduli of metallic post and dentin very often initiates dentine fracture, especially at the apex of the root. Additionally, many conventional dowel pins are threaded and must be screwed into dentin. This can also increase the potential for weakening and eventual fracture of the tooth.
There is a need to provide aesthetically pleasing posts and pins. It is desirable that the posts and pins are rigid and strong to support the stresses occurring in the mouth. It is important that the posts and pins are compatible with the properties of the endodontic materials in the mouth.
SUMMARY OF THE INVENTION
These and other objects and advantages are accomplished by the post and pins of the present invention comprising a rod fabricated of fiber-reinforced composite material. The rod comprises a plurality of frustoconical sections arranged coaxially along the longitudinal axis of the rod. Preferably the rod has consistent width along the longitudinal axis wherein the frustoconical sections each have the same tapered width and same length. The number of frustoconical units per rod can vary. The frustoconical sections may vary in shape. Moreover, the rod may include a channel therein extending along the longitudinal axis thereof. The rod may also include one or more grooves or flat surfaces extending along the surface thereof. In another embodiment, the post may include a portion of fibers or alternatively, all of the fibers, that are either pigmented or inherently colored to enable identification of the post inside the mouth.
The material formulation and surface design of the post of the invention are beneficial because the matrix resin of the post, filling material between the post and the root canal, and the core material disposed on top of the post, all contain the same or very similar chemical components. This enables better chemical bonding of the system. Furthermore, the rough surface structures of the post promote chemical bonding as well as mechanical anchors, resulting in a better retention of the post.
REFERENCES:
patent: 282639 (1883-08-01), How
patent: 3066112 (1962-11-01), Bowen
patent: 3179623 (1965-04-01), Bowen
patent: 3194784 (1965-07-01), Bowen
patent: 3715331 (1973-02-01), Molnar
patent: 3751399 (1973-08-01), Lee
patent: 3919774 (1975-11-01), Fishman
patent: 3926906 (1975-12-01), Lee, II et al.
patent: 4204321 (1980-05-01), Scott
patent: 4239489 (1980-12-01), Ellman et al.
patent: 4268253 (1981-05-01), Gross et al.
patent: 4290755 (1981-09-01), Scott
patent: 4293302 (1981-10-01), Hassler et al.
patent: 4334865 (1982-06-01), Borle
patent: 4479783 (1984-10-01), Weissman
patent: 4480997 (1984-11-01), Deutsch et al.
patent: 4544359 (1985-10-01), Waknine
patent: 4547531 (1985-10-01), Waknine
patent: 4571187 (1986-02-01), Weissman
patent: 4600392 (1986-07-01), Weissman
patent: 4604060 (1986-08-01), Weissman
patent: 4622012 (1986-11-01), Smoler
patent: 4684555 (1987-08-01), Neumeyer
patent: 4708655 (1987-11-01), Weissman
patent: 4717341 (1988-01-01), Goldberg et al.
patent: 4729736 (1988-03-01), Weissman
patent: 4738623 (1988-04-01), Driskell
patent: 4752225 (1988-06-01), Bori
patent: 4758163 (1988-07-01), Goldman
patent: 4778388 (1988-10-01), Yuda et al.
patent: 4778389 (1988-10-01), Salvo
patent: 4820159 (1989-04-01), Weissman
patent: 4828496 (1989-05-01), Lococo
patent: 4846685 (1989-07-01), Martin
patent: 4894012 (1990-01-01), Goldberg et al.
patent: 4932870 (1990-06-01), Miller
patent: 4934936 (1990-06-01), Miller
patent: 4936776 (1990-06-01), Kwiatkowski
patent: 5035620 (1991-07-01), Roane
patent: 5074792 (1991-12-01), Bernadat
patent: 5094618 (1992-03-01), Sullivan
patent: 5104321 (1992-04-01), Fihol
patent: 5118295 (1992-06-01), Stiles
patent: 5145373 (1992-09-01), Roane
patent: 5236361 (1993-08-01), Mays
patent: 5246369 (1993-09-01), Poulmaire
patent: 5263996 (1993-11-01), Filhol
patent: 5276068 (1994-01-01), Waknine
patent: 5277583 (1994-01-01), Chalifoux
patent: 5316478 (1994-05-01), Chalifoux
patent: 5326263 (1994-07-01), Weissman
patent: 5328372 (1994-07-01), Reynaud et al.
patent: 5336092 (1994-08-01), Chalifoux
patent: 5348476 (1994-09-01), Cohen et al.
patent: 5362237 (1994-11-01), Chalifoux
patent: 5425639 (1995-06-01), Anders
patent: 5437551 (1995-08-01), Chalifoux
patent: 5444104 (1995-08-01), Waknine
patent: 5453010 (1995-09-01), Klein
patent: 5458488 (1995-10-01), Chalifoux
patent: 5487664 (1996-01-01), Weissman
patent: 5492470 (1996-02-01), Anders
patent: 5518399 (1996-05-01), Sicurelli, Jr. et al.
patent: 5575651 (1996-11-01), Weissman
patent: 5588838 (1996-12-01), Hansson et al.
patent: 5595486 (1997-01-01), Manocha
patent: 5684103 (1997-11-01), Jia et al.
patent: 5741139 (1998-04-01), Sicurelli, Jr. et al.
patent: 5775910 (1998-07-01), Orrico
patent: 5788497 (1998-08-01), Chalifoux
patent: 5797748 (1998-08-01), Reynaud et al.
patent: 5871359 (1999-02-01), Billet et al.
patent: 5873725 (1999-02-01), Perler et al.
patent: 5964592 (1999-10-01), Hites et al.
patent: 6013694 (2000-01-01), Jia et al.
patent: 6039569 (2000-03-01), Prasad et al.
patent: 237877 (1945-09-01), None
patent: 3825601 A1 (1988-07-01), None
patent: 2588181 (1985-10-01), None
patent: 2 117 641 (1983-10-01), None
Karmaker Ajit
Prasad Arun
Bumgarner Melba
Jeneric Pentron Incorporated
Knab Ann M.
Wilson John J.
LandOfFree
Fiber reinforced composite post does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fiber reinforced composite post, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fiber reinforced composite post will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2605558