Dentistry – Prosthodontics – Holding or positioning denture in mouth
Patent
1984-08-06
1987-06-09
Wilson, John J.
Dentistry
Prosthodontics
Holding or positioning denture in mouth
433 80, 433173, 4332011, A61C 800
Patent
active
046717684
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an implant comprising on the one hand an anchoring part having one or more fixing means for anchoring the implant to the bone and on the other hand a prosthesis part adapted to fix a dental prosthesis to the implant.
SUMMARY OF THE INVENTION
The known and nowadays most applied implants have a metal anchoring part and the form of a plate, needle or screw. With these implants the anchoring is based on the mechanical engagement of the implanted body and the bone by forming of a tissue covering at the interface of the bone and the implanted body.
Further, from Dutch patent application No. 66,03182 implants of ceramic material like metal oxides especially aluminum oxide, -silicates, -carbides, -borides, -nitrides, -silicides or glass are known. These implants having e.g. the shape of pens are placed in hollow roots.
However, after the implantation of the known implants whereby the implant is partly in the body ("milieu interieur") and partly outside the body ("milieu exterieur"), as a rule infections appear because the transition region of "milieu interieur" to "milieu exterieur" is a "porte d'entree" for pathogenic bacteria and other pathogenic germs. At this "porte d'entree" the bacteria etc. coming out of the oral cavity which in view of the temperature and humidity present therein is an ideal breeding place for a.o. bacteria, penetrate into the body against the plasma stream. The body reacts thereon by starting a defensive reaction inducing the forming of pus. Because of these defensive reactions and the complications belonging thereto normally the placed implant gets lost or should even be removed for stopping a steady expanding infection.
The invention is aimed at the removal of the abovementioned objection so that the chances of survival of an implanted implant can be improved substantially.
It was found that the above described disadvantage of the known implants can be removed by providing the implant of a hollow cavity which extends from the prosthesis part into the anchoring part, the wall of the anchoring part is perforated at one or more spots and the prosthesis part is provided with a removable closing means for the cavity. More in particular, in this cavity a medicine like an antibiotic can be placed which by diffusion/osmosis via the perforations present in the wall of the anchoring part will leave the cavity of the implant and will be carried away with the plasma stream in the direction of the "milieu interieur/milieu exterieur". Therefore a considerable concentration of antibiotic is present at the transition region of "milieu interieur/milieu exterieur" so that this "porte d'entree" for bacteria etc. is closed. Normally an antibiotic having a broad spectrum like gentamycin is used.
Apart from the abovementioned advantage the implants according to the invention have the possibility to make instantaneous views of the condition of the implanted implant at any time. By removing the removable closing means one may carry out a puncture in the implant after which by means of a laboratory test it can be determined which bacteria/cells are present in the implant. In case of the presence of undesired bacteria/cells in the implant it is possible to combat these undesired bacteria/cells by means of a specific medicine. Therefore with the implants according to the invention it is possible to check constantly the condition of the implant and if desired to influence it. Further, it is possible to replenish or to replace the antibiotic present in the implant after some time e.g. at the half yearly check so that an optimum protection of the implant is guaranteed.
The implant according to the invention is preferably made of metal, e.g. dental gold having the composition of 65-85% gold, 1-4% palladium, 1-10% platinum, 10-15% silver, 0-10% copper and 0-1% zinc. As marketed dental gold metals are mentioned: "Degudent-G" (98% noble metal alloy) and "Permador". Next to the above alloys also noble metal alloys are qualified. Except noble metal alloys also other
REFERENCES:
patent: 237043 (1881-01-01), Palmer
patent: 2210424 (1940-08-01), Morrison
patent: 2347567 (1944-04-01), Kresse
patent: 2857670 (1958-10-01), Kiernan
patent: 4186486 (1982-02-01), Gordon
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