Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1995-05-11
1998-10-06
Lucchesi, Nicholas D.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
A61C 800
Patent
active
058168133
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an element comprising at least one cylindrical part to be implanted into bone tissue.
BACKGROUND TO THE INVENTION
There are two kinds of main systems for endo-osseous dental implants which are commonly used today.
One system utilizes fixtures provided with threads which are threaded into a hole drilled into the jaw-bone. This system can be exemplified by the so-called Br.ang.nemark system.TM.. This system comprises both threaded fixtures which are to be screwed into holes which have been provided with threads in advance and self-tapping fixtures which are screwed into a non-pretapped hole drilled in the jaw-bone.
The other system commonly used can be exemplified by the so called IMZ-implant, which utilizes a cylinder provided with a rough surface serving as a fixture and which gently is tapped into a bore-hole in the jaw-bone. The roughness of the surface has no specific orientation.
The threaded fixtures have some important advantages, a major one being a result of the fact that the main loads in the clinical situation are axial loads. Threaded implants are very well suited to support axial loads and this may be particularly important in the initial stages of the osseointegration process in which it is important that the implant is fully stable and as immovable as possible in the bore-hole. The term "osseo-integration" as coined by Prof Br.ang.nemark and his coworkers in Gothenburg during the seventies and as used here refers to the close apposition between bone tissue and implants that for instance may be obtained by using implants made of titanium.
There are however some inherent disadvantages in this construction, one of the major ones being the time and the care needed to screw a self-tapping implant into a hole. If the hole also has to be provided with threads in advance, the total period of time needed for the operation of course will be much greater. Although a conventional threaded implant conceivably could be tapped into a hole having almost the same diameter as the major diameter of the threads, the distance the bone tissue would have to grow into the threads would be excessive and the time needed for the osseo-integration process would be long.
The rough-surfaced cylindrical implant is very simple to insert and the time needed for this is short. It may however happen that implants having this design gets stuck in the bore-hole before the implant is fully inserted, which may result in an unacceptable trauma to the bone tissue, both if the implant is inserted entirely by force and if the implant is extracted by force. Both the initial and the final stability of the implant will be less than the initial and the final stability of a threaded implant.
SHORT DESCRIPTION OF THE INVENTIVE CONCEPT
The object of the invention is to provide an implant which combines the advantages of the two above systems whilst eliminating the disadvantages thereof.
This object is achieved in that an endo-osseous implant is provided with the features set forth in the appended main claim.
Preferred embodiments are set forth in the appended dependent claims.
SHORT DESCRIPTION OF THE APPENDED DRAWINGS
FIG. 1 shows an overall view of an implant according to the invention.
FIG. 2 shows a section of the implant in FIG. 1 taken along the the line I--I.
FIG. 3 shows an end view according to the line II--II in FIG. 2.
FIG. 4 shows a first preferred embodiment of the microthreads and FIG. 5 a second preferred embodiment of the microthreads.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION
A preferred embodiment of the invention comprises an implant having a generally cylindrical body 1 for insertion into a bore-hole in bone tissue. The envelope surface of the body 1 is provided with very small threads 2, herein called micro-threads since their dimensions are in the micrometer range. These threads will allow the implant to function as a screw. The forward end or the tip of the screw is provided with three cutting edges 4 in conjunction with
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patent: 5259398 (1993-11-01), Vrespa
Hansson Stig Gustav Vilhelm
Wennberg Stig Goste
Astra Aktiebolag
Lucchesi Nicholas D.
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