Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Preparing compound other than saccharide containing a...
Patent
1993-04-27
1995-01-10
Wilson, John J.
Chemistry: molecular biology and microbiology
Micro-organism, tissue cell culture or enzyme using process...
Preparing compound other than saccharide containing a...
433 60, 433 63, A61C 1100
Patent
active
053801997
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/GR 92/00007 filed Jun. 10, 1992 and based, in turn, upon Greek national application 910100316 filed Jul. 17, 1991 under the International Convention.
1. Field of the Invention
My present invention relates to a plane line dental articulator to be used in mounting dental casts in dental prosthesis laboratories.
2. Background of the Invention
Plane line dental articulators used in dentistry to date are known and classified as follows:
a. articulators in which the mounting of the dental casts is carried out by means of gypsum.
b. articulators in which the mounting of the dental casts is carried out without gypsum.
Additionally, both articulators mentioned above sibilate the movements of the lower jaw on the upper element of the articulator, a position that does not match the normal function of the parts of the oral cavity.
The various models of the first case manufactured to date are of one size and nonadjustable with relation to the height of dental casts. Therefore, the mounting of the casts is carried out directly on the metallic frame by means of gypsum.
This has the following drawbacks:
a. Sensitivity to dimensional changes in the gypsum used in cast mounting. That causes distortion of the articulation due to the fact that this kind of articulator cannot be adjusted with relation to the height of the dental casts. Furthermore, there is no guide for setting the specific quantity of gypsum used in the mounting of upper and lower jaw casts.
b. The articulator is hard to handle as the operator must hold the articulator frame together with the mounted casts during prosthodontic work.
c. The removal of the casts from the articulator is carried out by breaking the gypsum. This can jeopardize the integrity of the casts and reduce the strength of the articulator.
d. Most plane line articulators can be used only for a single case each time because the casts are mounted directly on the metallic frame.
The second type of articulator (namely, articulators in which the mounting of the casts is carried out without gypsum) have not fully remedied these drawbacks. It is for this reason that to date the majority of the articulations are formed on articulators by means of gypsum.
The problems raised by the second type of articulator are the following:
a. Time consuming process for mounting the casts on the articulator due to that the systems currently in use require an additional process of manipulating the casts and a specific type of mold which increases the size of the cast and make it unwieldy.
b. The mechanical process for mounting the cast which is used is not safe nor firm, two factors necessary for the accuracy of the oral cavity articulation and for the prosthodontic work. The mechanical means are bulky and heavy and not easy to work with.
c. Owing to the above stated difficulties, the various systems that have been used so far cannot offer a solution to an entire range of cases, but have limited utility.
Object of the Invention
It is an object of the invention to remedy these drawbacks. More particularly, it is an object to provide an improved articulator which allows the movements of the lower jaw take place in the area of the lower element of the articulator and which replaces all complicated cast mounting systems with a simple one.
Summary of the Invention
According to the invention to secure accurate movements on the articulator and the harmonization thereof with the normal movements of the lower jaw, the new articulator provides a new system located on the lower element of the articulator which executes the movements while making available the upper element of the articulator for the same movements of the lower jaw.
By a triple function rubber sleeve-stopper and holder, the dental articulator can be applied to cases of cast mounting with or without gypsum.
The arcticulator of the invention offers a solution of the problem of adjusting the articulator with relation to the height of the cast, because its new design is bas
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patent: 582731 (1897-05-01), Fourt
patent: 2262574 (1941-11-01), Chott
patent: 3844040 (1974-10-01), Willis
patent: 4175325 (1979-11-01), Beckwith
patent: 4299570 (1981-11-01), Yogosawa
patent: 4414822 (1993-01-01), Blechner
patent: 4496320 (1985-01-01), Hwang
patent: 5026282 (1991-06-01), Koike
Dubno Herbert
Wilson John J.
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