Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1999-05-13
2000-08-08
Lucchesi, Nicholas D.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433173, A61C 800
Patent
active
060993138
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a dental implant of metal material having a bone contact portion for insertion into a tooth cavity of a jaw and a build-up portion for fixing a crown, a process for the production of a dental implant, a template for inserting an implant and a process for the production of such a template.
The implantation of dental implants is a dental method of treatment in which an implant which is a more or less true-to-scale copy of the extracted natural tooth is put back into the alveolus, that is to say the tooth socket. In that respect, the most widely varying shapes of industrially manufactured implants are known in implantology.
The applicants' DE 195 13 881 A1 describes an implant and a process for the production of such an implant, whereby an accurately fitting tooth prosthesis which enjoys long-term stability can be provided in a particularly advantageous manner.
However it is possible to conceive of the medical situation where for example the tooth socket depth is reduced by degeneration of the jaw bone in the region of the socket of the extracted tooth: that can attain such an extent that it is no longer possible to provide for a durable fit, which can carry mechanical loadings, of an implant to be fitted therein, by virtue of the remaining effective tooth socket depth.
A dental implant of metal material having a bone contact portion for insertion into a tooth cavity of a jaw and a build-up portion for fixing a crown is known from FR-A-2 468 352; formed on a root produced from calcined material as a bone contact portion of an implant with small blade portions projecting cross-wise therefrom is a cylindrical axial bar portion with arms projecting therefrom and a stump which delimits it in an upward direction and which tapers away from it. The arms are pins which pass through the axial bar and which are inclined with respect thereto and which cross each other and which project laterally out of its flanks and there engage into the bone. In an upward direction the pins terminate in the region of the stump which serves as a build-up portion. Also shown is a base plate which bridges over the bone for the build-up portion, which is held by the mutually crossing pins--now without implant or artificial root. Those pins of small cross-section can be comparatively long to improve the support thereof in the bone.
Therefore the object of the present invention is so to improve a dental implant of the kind set forth in the classifying portion of the main claim, that secure insertion of implants is possible even for only shallow tooth socket depths: this also applies in regard to situations in which the tooth socket depth is only slight, due to other circumstances. Furthermore, as a system concept, the invention seeks to provide devices and processes for the production of such devices with which reliable secure insertion of such improved implants is possible.
The object of the invention is attained by the dental implant, the production process for a dental implant, the template and the production process for said template as set forth in the present specification.
In accordance with the invention the extension portion is of a diameter which is smaller than the corresponding cross-sectional dimension of the bone contact portion, wherein the latter and/or the extension portion includes on its surface a plurality of honeycombs which are arranged at uniform spacings and which extend--in mutually adjoining relationship--substantially over the entire surface in the manner of a uniform pattern; the extension portion is also of a substantially cylindrical shape.
Advantageously therefore the extension portion according to the invention which is adapted for insertion into an artificially produced opening in the jaw, which deepens the tooth socket at the bottom, extends the apical end of the bone contact portion (which in the present case is intended substantially to mean the region which imitates the extracted tooth root), so that an additional hold and an extended mechanical lever arm in the jaw bone ar
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Dorken Wolfgang
Gieloff Burkhard
Klaus Gerold
Rademacher Bernd
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