Source: http://www.google.com/patents/US6319000?dq=5435091
Timestamp: 2014-03-13 21:47:11
Document Index: 401876632

Matched Legal Cases: ['art 3', 'art 2', 'art 2', 'art 2', 'art 36', 'art 26', 'art 43', 'art 2', 'art 3', 'art 2', 'arts 42', 'art 2', 'art 3', 'art 2', 'art 2', 'art 3', 'application No. 9602555']

Patent US6319000 - Dental prosthesis system, components for dental prosthesis system and ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe invention relates to a dental prosthesis system incorporating a superstructure (4, 5), a positioning device, and fixtures (1) that are implantable in a person's jawbone. Each fixture (1) is anchored in the jawbone and its opposite end is arranged so that it will be possible to attach a superstructure...http://www.google.com/patents/US6319000?utm_source=gb-gplus-sharePatent US6319000 - Dental prosthesis system, components for dental prosthesis system and methods for such a dental prosthesis systemAdvanced Patent SearchPublication numberUS6319000 B1Publication typeGrantApplication numberUS 09/202,988Publication dateNov 20, 2001Filing dateJun 12, 1997Priority dateJun 27, 1996Fee statusPaidAlso published asCA2258782A1, CA2258782C, CN1116853C, CN1228689A, EP0910306A1, WO1997049351A1Publication number09202988, 202988, US 6319000 B1, US 6319000B1, US-B1-6319000, US6319000 B1, US6319000B1InventorsPer-Ingvar Br�nemarkOriginal AssigneeMedevelop AbExport CitationBiBTeX, EndNote, RefManPatent Citations (20), Referenced by (26), Classifications (10), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetDental prosthesis system, components for dental prosthesis system and methods for such a dental prosthesis systemUS 6319000 B1Abstract The invention relates to a dental prosthesis system incorporating a superstructure (4, 5), a positioning device, and fixtures (1) that are implantable in a person's jawbone. Each fixture (1) is anchored in the jawbone and its opposite end is arranged so that it will be possible to attach a superstructure (4, 5) to it. By means of the positioning device, fixtures (1) are implanted at definite positions and in definite directions, usually parallel directions. The superstructure includes prefabricated elements with fastening devices (8, 9) that can be attached to fixtures (1). In accordance with the invention, reference device (1 a) is designed to put the positioning device in place in such a way as to reliably provide the aforesaid definite positions and directions, therewith facilitating the use of prefabricated superstructures. Through its other aspects, the invention relates to significant components suitable for a dental prosthesis system of this type. Moreover, the invention relates to methods used in connection with the application of the dental prosthesis system.
What is claimed is: 1. A dental prosthesis system comprising:
a superstructure provided with a first fastening device; a drilling jig; and a plurality of fixtures that can be implanted in a person's jawbone, each fixture including: an anchorage end arranged for anchoring in a jawbone; and a fastening end arranged for fastening said superstructure at each fixture; wherein at least one part of each fixture is substantially rotation-symmetrical and defines the center axis of said fixture; wherein said drilling jig comprises a fixed plate arranged to impart to said fixtures pre-determined mutual positions and impart to the center axes of said fixture pre-determined directions relative to each other, the drilling jig being provided with at least one guiding hole having a fixed position in the drilling jig and being arranged for guiding a drilling bit to make an anchorage hold in a person's jawbone; and wherein said superstructure includes prefabricated elements that incorporate said first fastening device and is adapted for attachment to said fixtures at said pre-determined mutual positions and in said mutual center axis directions; and wherein the system also contains a reference element attachable to a person's jawbone, said reference element being arranged to co-operate with said drilling jig by engagement therewith to position said drilling jig in a pre-determined position. 2. Dental prosthesis system in accordance with claim 1, wherein said reference element is a first fixture of said number of fixtures.
It is known to implant fixtures in the jawbone of a toothless person. To make certain the fixtures are anchored permanently, a number of factors must be fulfilled with regard to, among other things, material selections and operation techniques. In practice, fixtures developed by Professor Branemark made of pure titanium with a micro-pitted surface have displayed very good long-term anchoring properties. The screw-shaped fixtures are operated into the jawbone where they are allowed to heal in�osseointegrate�throughout a certain time period, usually a few months. Teeth can thereafter be mounted in the fixtures, Most types of these implanted elements are provided with external threads�and are thus implanted screws�and they are attached by screwing them into holes made in the bone tissue. The holes are usually pre-threaded, but it is also possible to screw in self-tapping screws. Implanted elements normally require shorter or longer times for healing-in before they should be exposed to significant loads. On implanted elements, one can attach individual teeth, i.e. one tooth per element, but a number of implanted elements, at least two, can also serve as attachment points for a bridge structure containing several teeth or even a complete row of teeth. For this purpose, a suitable design for the free end of an implanted element could comprise, for example, internal threads in a cylindrical bore in a tooth element that engage external threads on the cylindrical attachment part of a single-tooth prosthesis.
The mounting of dental bridges requires a great deal of work, and as a result the costs of reconstructing a complete upper or lower jaw are relatively high. Moreover, reconstruction is very time-consuming, even for the patient. It is therefor desirable to reduce, by means of user-friendly implanting and mounting solutions, the amount of time and work needed for full-jaw reconstructions�including reconstructions that only involve a significant contiguous part of a row of teeth.
FIGS. 1 and 2 illustrate the main components in a dental prosthesis system in accordance with the invention. These are shown most clearly by the exploded view in FIG. 1. A number of fixtures 1�three are shown in the example�are anchored in bone tissue 7 (see FIG. 2) in a person's lower jawbone. Each fixture contains an anchoring part 3 and a spacer part 2 that is attached to the anchoring part by means of, for example, a threaded joint. A bar 4 has three through-holes whose positions match the exposed ends of each fixture 1 's spacer part 2 so that bar 4 can be fitted over these exposed ends. A screw 9 is passed through each hole 8 in bar 4 and screwed into place in a bore 40 in spacer part 2 to affix bar 4 to the three fixtures 1. On bar 4 there is a prosthesis bridge 5 that carries dental prostheses (not shown in FIGS. 1 and 2). This prosthesis bridge 5 is attached by means of four retainer screws 6 each of which is passed through its own hole in the prosthesis bridge and screwed in place in its own internally threaded bore 12 in the top of bar 4. FIG. 2 shows how the dental bridge is anchored in jawbone 7 by means of the described elements.
During mounting, fixture 1 b 's anchoring part 36 and spacer part 26 are joined to form a single unit by screwing threaded part 43 of spacer part 2 b into a bore having a mating internal thread in fixture 1 b 's anchoring part 3 b. Moreover, mounting screw 38 is passed through hole 34 in aligning element 33 and screwed into bore 40 in the top side of spacer part 2 b so that bores 35, 36 in the aligning element surround the corresponding parts 42, 41 of spacer element 2 b. Mounting screw 38 and aligning element 33 as well as fixture 16's spacer part 2 b and anchoring part 3 b are thus passed as a single unit through hole 32 in sleeve 30, wherewith aligning element 33's external shell surface 45 fits hole 32 in sleeve 30 and is guided by it. Thereafter, mounting screw 38 is tightened. Since it is already tightened all the way to the bottom of spacer part 2 b 's bore 40 and since spacer part 2 b is screwed all the way into anchoring part 3 b, the tightening of mounting screw 38 causes fixture 1 b to be screwed into the hole drilled in the jawbone. Fixture 1 b 's lower end is thus, in a known manner, designed to be self-tapping, and it is screwed down and anchored in the drilled hole. Screwing-in continues until aligning element 33's flange 37 comes into contact with sleeve 30's top side 47 which defines the correct screwing-in depth. This is shown most plainly in FIG. 7.
In spite of the accurate positioning of fixtures so that they will acquire positions and directions compatible with the fastening devices on the bridge base, there may be risk for some remaining inadequacy, particularly with regard to the mutual alignment directions of the fixtures. It is difficult to achieve complete mutual parallelism among the fixtures. This problem is described in greater detail in Swedish patent application No. 9602555-6, entitled �Fixtures, prosthesis anchoring arrangement and prosthesis�, which is herewith referred to.
Bar 103 defines a direction that is dependent on the direction of a first (not shown) fixture. An effort is made to see that this direction's normal alignment B will correspond to the shown direction of fixture 101. Such is not the case in the figure. Instead, there is a deviation of α� between them. A corresponding angular deviation also occurs between supporting surface 109 and bearing surface 113.
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20080724Apr 28, 2005FPAYFee paymentYear of fee payment: 4Mar 2, 1999ASAssignmentOwner name: MEDEVELOP AB, SWEDENFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BRANEMARK, PER-INGVAR;REEL/FRAME:009887/0402Effective date: 19981207RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google