Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1999-08-05
2000-04-25
Lucchesi, Nicholas D.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433176, A61C 800
Patent
active
060537337
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a dental implant of the type used by dental surgeons for insertion into the maxillary bone of the jaws of patients, so that they act as a firm base on which to assemble false teeth or dentures.
The general technique for these implants was suggested more than twenty years ago by the Swedish professor Dr. Br.ang.nemark and a great many variations on this are known, aimed at improving or trying to improve their characteristics in order to increase their effectiveness.
In general terms, a dental implant is a unit that is housed in the jawbone of the patient, by suitably securing it to the bone, until the upper area or coronal is reached. In this area, the implant is provided with means to enable the stable fixing of a false tooth. In order to perforate the bone, it is first milled, at least, so as to obtain a hollow cylindrical internal cavity with a flat surface, which is later screw threaded with another tool, for example a tap, in order to obtain a screw-threaded internal cavity in which the implant can be suitably secured.
This latter screw threading operation of the flat-sided perforation in the bone is usually carried out by means of the implants themselves, called self-tapping, already known for many years and which base their technique on the already mentioned system of the taps.
Through patent U.S. Pat. No. 2,388,482, a surgical instrument to make perforations in the bones of patients is known, which is provided with a screw-threaded area, finishing off in a portion equipped with four longitudinal recesses, which in turn is finished off by its characteristic apical end.
Moreover, the existence is also known, through publication U.S. Pat. No. 2,472,103, of a tool to carry out the screw threading, which has a cylindrical portion provided with a helicoidal screw thread which is finished off by another conical end portion, in which the said screw thread continues to extend itself, with this latter conical area being provided with longitudinal slots or grooves that favour the insertion of the tool.
Also known, by means of U.S. Pat. No. 2,609,604, is a conical implant provided with a helicoidal screw thread with a multitude of longitudinal slots that extend radially along its outer periphery.
Through U.S. Pat. No. 3,435,526, an implant is known that has a polygonal head, e.g. with a hexagonal cross section, so that it can be used during fixing to the bone, followed by another flat cylindrical portion, which gives way to another cylindrical portion with a smaller diameter, which is screw threaded and has holes passing through it. The end of this implant is trunco-conical and longitudinal slots circulate from this end.
An implant is also known through U.S. Pat. No. 3,672,058 whose body is conical and is occupied by a helicoidal screw thread of a large pitch, which is also provided with longitudinal slots. This implant is self-tapping and its internal or apical end is conical with an angle of approximately 10 degrees in order to facilitate its insertion.
The tap teeth or threads have, starting from its conical apical head, a progressive increase both in the head radius and in the base radius, given that the base of the body is totally conical.
Through the patent FR.A. 2,395,738, a conical implant is also known which is provided with helicoidal teeth and slots, both straight longitudinal ones and inclined or slanting ones.
In U.S. Pat. No. 4,324,550 an implant is described, also conical, provided with tap teeth or threads, in which there are also longitudinal slots, which in turn have cutting edges that facilitate the screwing of the implant into the bone.
Also known through the German publication "Rund um die werkzeugmaschine", published in Spain under copyright in 1957, Editorial Reverte, S. A., are taps with their cylindrical body finished off at the end by a trunco-conical portion, with both being provided with helicoidal teeth or threads and with longitudinal slots that provide cutting edges.
U.S. Pat. No. 4,406,623 presents an implant which is conical and is provided with helicoi
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patent: 4842518 (1989-06-01), Linkow et al.
patent: 4854872 (1989-08-01), Detsch
patent: 5000686 (1991-03-01), Lazzara et al.
patent: 5312256 (1994-05-01), Scortecci
patent: 5316476 (1994-05-01), Krauser
Aspichueta Santiago Aldama
Bolunburu Beatriz Aldama
Beatriz Aldama Bolunburu
Lucchesi Nicholas D.
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