BENDABLE ADAPTER FOR DENTAL IMPLANT
FIELD OF INVENTION
This invention relates to two part dental implants, 5 and more particularly to a titanium adapter cooperable with the anchor at one end and the superstructure at the other.
BACKGROUND OF THE INVENTION 10
Dental implantology for dental prostheses is now often selected in the interests of (1) achieving stable mechanical structures; (2) minimizing distortions of natural conformation; and (3) promoting comfortable and effective dental functions. The most reliable way to 15 achieve these results is with a two part implant that allows for attachment of an adapter to an anchor. Certain problems remain.
For example, the location and axial orientation of the anchor in the jaw bone is selected after careful radiolog- 20 ical survey in order to maximize the prospects for long term retention. Unfortunately, the location and orientation so determined often do not comport with the optimum axial orientation of the superstructure needed for esthetics and dental function. Prior art two part im- 25 plants have not permitted any adjustments in the angularity of the parts of the implant. Hence compromises have been tolerated. In some cases, the misorientations have been so extreme as to prevent the utilization of removable bridges. 30
The primary object of the present invention is to provide a two part implant system in which the angular orientation of the prosthesis can be adjusted to maximize esthetic and mechanical requirements while not compromising orientation of the anchor for proper 35 fixation.
SUMMARY OF INVENTION
In order to accomplish the foregoing objective, I provide, first, an anchor that nominally projects slightly 40 above the bone ridge to the level of the gum tissue at the alveolar crest and second, a special bendable adapter made of titanium or titanium alloy. One end of the adapter is inserted into the accessible anchor socket for rigid connection thereto, and the other or distal end 45 projects into the dental crown region to support a superstructure. In a simple case, the projecting end of the adapter is located adjacent a normal tooth and supports a crown. In a more elaborate case, projecting ends of a number of adapters may be oriented to comport with 50 the design of the superstructure and to minimize interference with tissue at the lateral, or even the lingual aspect. In still another case, the projecting ends of a plurality of adapters may provide parallel sockets for a detachable ball connector of an overdenture. The pro- 55 jecting part of the adapter takes various forms for such functions. For example, the projecting part may accommodate a screw, or it may be a simple coping upon which a superstructure can be built, or it may provide the socket for a ball connector. 60
The intermediate portion of the adapter is necked down to provide a bendable region close to the level of the gum tissue. The bendable region allows the dentist to change the axial alignment of the projecting end of the adapter in order that it closely conforms to the 65 surrounding structures, or to achieve parallelism, as for detachable ball connectors, or to avoid interference with the mouth tissues. In order to achieve bendability
without undue compromise of strength, I employ commercially pure titanium or a titanium alloy such as that consisting of 90% titanium, 6% aluminum and 4% vanadium. The pure titanium allows more bending while the alloy exhibits a greater strength characteristic. The neck diameter for pure titanium is between 0.060 to 0.090 inches with about 0.075 inches optimum. The neck diameter for the alloy is between 0.050 and 0.080 inches, with 0.065 inches optimum. Certain stainless steel compositions can be used with adjustments in the neck diameter.
BRIEF DESCRIPTION OF THE DRAWINGS
A detailed description of the invention will be made with reference to the accompanying drawings wherein like numerals designate corresponding parts in the several figures. The mechanical structures shown are to scale.
FIG. 1 is an exploded view of companion implant parts comprising an anchor, a titanium coping adapter and a single tooth restoration to be built on the coping.
FIG. 2 is a pictorial view of a titanium coping adapter bent to justify the different angularity of the anchor and the tooth restoration.
FIG. 3 is a diagrammatic view illustrating the manner in which a coping adapter of FIG. 1 is advantageously used in the mouth of a subject.
FIG. 4 is an exploded view of companion implant parts comprising an anchor, a titanium screw adapter and a screw.
FIGS. 5 and 6 are companion views of the mouth of a subject illustrating the manner in which screw adapters of FIG. 4 are advantageously used (FIG. 5) for attachment of a restoration (FIG. 6).
FIG. 7 is an exploded view of companion implant parts comprising an anchor, a titanium socketed adapter and a ball connector.
FIG. 8 is a diagrammatic view corresponding radiographic projection illustrating the manner in which socketed adapters of FIG. 3 are bent to achieve parallelism for cooperation with a ball connector of a denture structure (not shown).
DETAILED DESCRIPTION OF THE
The following detailed description is of the best presently contemplated mode of carrying out the invention. This description is not to be taken in a limiting sense, but is made merely for purposes of illustrating the general principles of the invention, the scope of the invention being defined by the appended claims.
Structural and operational characteristics attributed to the form of the invention first described shall also be attributed to forms later described, unless such characteristics are obviously inapplicable or unless specific exceptions are made.
In FIG. 1 there is illustrated a biocompatible anchor 10 designed to be attached to the jaw bone of the subject. The anchor 10, described in full detail in my prior U.S. Pat. No. 4,431,416, is installed in a recess prepared in the bone tissue so that its upper end projects about one millimeter above the bone crest. The position and angularity of the anchor is determined primarily by the conformation of the bone tissue.
The present invention is not limited to the specific anchor shown; for example, a blade type anchor can be provided. In any event, the anchor provides a recess 12