Dentistry – Apparatus – Having static product shaping surface
Reexamination Certificate
2001-02-12
2001-11-13
Lewis, Ralph A. (Department: 3732)
Dentistry
Apparatus
Having static product shaping surface
C433S041000
Reexamination Certificate
active
06315555
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a series of single use print holders for obtaining prints of the maxillary arch and of the mandibular arch in edentulous patients and to the method for the realisation of total prostheses.
In particular, the present invention relates to a series of single use print holders that are used in the realization of total prostheses of the maxillary arch and of the mandibular arch, prostheses which may be both of the type without fastening points and with natural or artificial fastening points. The present invention also relates to the method for the realization of total prostheses of the maxillary arch and of the mandibular arch.
THE BACKGROUND ART
The current art for obtaining a total prostheses for the maxillary arch or for the mandibular arch essentially comprises four phases that precede the actual construction phase of the prosthesis.
The first phase entails obtaining a negative primary print of the edentulous arch to be fitted with a prosthesis. For this phase, a standard print holder is used, which is available in different sizes and coarsely fits on the arch to be provided with a prosthesis. The print holder is filled with suitable material, for instance alginate, it is positioned on the arch and the so-called negative primary print of the arch is obtained.
In the course of the second phase, a primary model of the edentulous arch is obtained. The negative primary print of the arch is filled with appropriate material, for instance plaster, and after it has dried the so-called positive primary print of the arch is realised.
From the third phase, an individual negative secondary print holder is obtained. This print holder is individual because it is specific and personalized for the patient. On the positive primary model of the arch some preparatory interventions are performed, such as contouring the primary model, in order to obtain an individual print holder that takes into account the anatomic specificity of each individual patient.
Upon completion of these preparatory interventions the positive primary model of the arch is coated with suitable dental material, generally waxy material, to create a certain thickness with respect to the arch, and subsequently it is coated with other dental material, generally acrylic resin. When the resin is polymerised the positive primary model is removed and a negative print of the arch is obtained, which constitutes an individual secondary print holder of the arch.
The fourth phase allows to obtain a final positive model of the arch whereon the prosthesis is to be constructed.
The secondary individual print holder is subjected to border moulding, i.e. the rim of the individual print holder is coated with essentially resinous and/or waxy material, and the print holder thus coated is inserted on the arch to be fitted with a prosthesis in the mouth of the patient, who is requested to perform the functional movements that leave trace on the part of the rim of the print holder whereon material has been placed which, having certain malleability characteristics, records aggregations, separations projections etc., due to the movement of the muscles of the patient's mouth. Upon completion of this operation the individual print completed by the border moulding is “cleaned” and different dental material, for instance polysulphur, is inserted which, adhering to the negative of the individual print holder generates the negative of the individual secondary print. Then, with special dental material, generally high precision plaster, the positive and definitive secondary model that serves as the base for the realization of the prosthesis is realized.
Hence, the traditional procedure is long and relatively costly in that it entails obtaining the prints of the arches twice and it generally calls for the realization of an individual print holder in the laboratory. Moreover, obtaining the primary prints with standard print holders may cause discomfort to the patient.
DISCLOSURE OF INVENTION
To overcome such drawbacks, print holders able to be modelled have been proposed, made of metal or thermoplastic resins, or with special pastes which modelled on the arch to be fitted with a prosthesis, once hardened, obtained an individual print holder. These solutions, however, were not found valid due to problems with shape stability and excessive cost.
The purpose of the present invention is to eliminate the aforementioned drawbacks, providing a series of single use individual print holders.
The invention, as it is characterised by the independent claims, solves the problem of obtaining the prints of arches in edentulous patients with a series of print holders, already made in different sizes, which allow directly to obtain the model of the final print which serves as a basis for realising the final prostheses.
According to a preferred embodiment of the present invention, the print holders are a series of four print holders of different sizes for maxillary arches, and a series of five print holders of different sizes for mandibular arches.
The dependent claims refer to preferred embodiments of the present invention.
One of the advantages obtained by means of the present invention essentially consists of the fact that it is simple and its realisation is relatively inexpensive and that it allows to shorten the method for obtaining total prostheses.
The technical features and advantages of the invention shall be made more readily apparent from the detailed description that follows, made with reference to the accompanying drawings, which represent an embodiment provided purely by way of non limiting example.
REFERENCES:
patent: 3473225 (1969-10-01), Deuschle et al.
patent: 4227877 (1980-10-01), Tureaud et al.
patent: 855148 (1960-09-01), None
Lewis Ralph A.
Young & Thompson
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