RU2732426C1 - Method of impression preparation for model casting in patients with resected alveolar process of upper jaw - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: invention refers to medicine, namely to orthopaedic dentistry, and is intended for use in model casting in patients with resected alveolar process of upper jaw to make prosthesis on upper jaw. Impression from silicone impression material is prepared and edge of impression is made. Impression edge is restored by means of formed board, which is made of base wax plate with thickness of 2 mm. Base wax plate is pre-cut to a height of not more than 10 mm, which does not exceed the height of the preserved teeth on the opposite side, and is poured to the impression with the help of a spatula and an alcohol lamp. At the same time on the side of the prosthetic bed wax plate is poured "butt joint", and on the reverse side, the amount of wax is increased for better attachment of wax plate during casting model.

EFFECT: method enables casting the model with preservation of the prosthetic bed, which ensures accurate manufacture of the prosthesis on the upper jaw.

1 cl, 7 dwg

Description

The invention relates to medicine, to orthopedic dentistry, can be used for casting a model for patients with a resected alveolar ridge of the upper jaw in the manufacture of a prosthesis for the upper jaw.

The relevance is due to the difficulty in casting the model for patients with a resected process of the upper jaw, namely, to prevent damage to the model during its opening, since the mucous membrane covering the rest of the alveolar process immediately passes to the cheek. At the same time, it is very important to preserve the existing boundaries of the future prosthesis when casting a model of the upper jaw with a resected process, since the absence of a transitional fold resulting from surgery makes it difficult and sometimes makes it impossible to manufacture a full-fledged upper jaw prosthesis.

When resecting the alveolar process of the upper jaw, anatomical landmarks are often violated, there is no transitional fold, there are scars and cicatricial deformities of the mucous membrane resulting from surgical interventions. And, despite the fact that there is no communication between the oral cavity and the nasal cavity, prosthetics of such patients is difficult due to the listed reasons.

The known method of casting a plaster model on an impression taken from the upper jaw without resected alveolar process. To do this, the imprint is filled with gypsum slightly above its edges, after which a small slide of gypsum is poured onto the table and, turning the imprint upside down, put it on the gypsum, squeezing the slide somewhat. Then they coat the impression with a spatula and smooth the impression so that its edges are immersed in plaster. When the gypsum hardens somewhat, the impression with the model is removed from the table and the gypsum that goes beyond the impression is removed with a spatula. After separating the impression from the model, the excess gypsum is cut off.

(Kurlyandsky V.Yu. Orthopedic dentistry. Dental prosthetics. Atlas, Volume One. - M .: 1963. - P.28.)

The disadvantage of this method is:

- the impression is filled with plaster slightly above its edges at random, and in the absence of a transitional fold, it is difficult to determine where the edge of the print is difficult;

- to coat and smooth the print with a spatula, so that its edges are immersed in plaster, also has to be arbitrarily;

- cutting off excess plaster that goes beyond the limits of the impression is possible only when the boundaries of the impression are known, otherwise cutting off the excess more than necessary will lead to a decrease in the boundaries of the prosthetic bed.

The technical result of the claimed invention is to improve the quality of manufacturing a working model of the upper jaw in patients with a resected process of the upper jaw.

A method is proposed for preparing an impression for casting a model for patients with a resected alveolar ridge of the upper jaw, in which the edges of the impression in the region of the resected alveolar ridge and the absence of a transitional fold after surgery are enlarged using a wax plate.

The difference is that due to the absence of a part of the alveolar ridge and the transitional fold in the region of the resected alveolar ridge of the upper jaw, for casting the model of the upper jaw, the edge of the impression is restored using a formed bead made from a wax plate. The usual edging of the impression using edging wax of different diameters is impossible due to the need to restore the height of the lost part of the alveolar process. To do this, a wax plate is poured onto the impression using an electric spatula or a simple spatula and an alcohol lamp. The wax plate is pre-cut to the required size from the base wax plate, 2 mm thick. The height of the wax depends on the remaining teeth on the opposite side, but should not exceed them. Then the wax plate is poured into the impression, while from the side of the prosthetic bed the wax plate is poured "joint to joint" without wax build-up. On the reverse side, wax build-up is possible for better fixation of the wax plate during casting of the model. After forming the side of the impression, a plaster model is cast. The model is opened upon completion of the gypsum crystallization process.

The proposed invention makes it possible to cast a model with the preservation of the prosthetic bed, which ensures accurate manufacturing of the prosthesis for the upper jaw.

The claimed technical solution is illustrated by illustrations:

Fig. 1. The state of the oral cavity is the absence of the alveolar process, the transitional fold of the upper jaw on the right.

Fig. 2. An impression was taken from the upper jaw with a standard spoon with elastic impression material.

Fig. 3. Impression from the upper jaw with formed wax rim.

Fig. 4. Model of the upper jaw, cast using an impression with a formed flange.

Fig. 5. Model of the upper jaw with marked borders of the removable denture.

Fig. 6. Partial removable plate prosthesis for the upper jaw with clasp fixation.

Fig. 7. Removable denture in the oral cavity.

The causal relationship between the features of the claims and the technical result is as follows.

The proposed invention will provide:

1) Using a wax plate will create a limitation on the edges of the print, because in this case, the use of conventional edging wax is not possible. The patient has no place of transition from the body of the jaw to the cheek, there is no transitional fold.

2) prevention of unnecessary cutting of the edges of the plaster model, because the required board height is set, because from the side of the prosthetic bed, the wax plate is poured "joint to joint" without wax build-up.

3) prevention of reducing the boundaries of the future plaster model,

4) the exact boundaries of the removable denture due to the fact that the wax plate is pre-cut of the required size from the base wax plate, 2 mm thick.

The proposed invention is implemented as follows:

- after examining the patient, assessing the state of the oral cavity (the mucous membrane covering the upper jaw immediately passes to the buccal mucosa), assessing the absence of the alveolar ridge of the upper jaw on the right, assessing the absence of communication between the oral cavity and the nasal cavity (Figure 1);

- an impression is taken from the upper jaw (Fig. 2);

- the taken impression is prepared for casting the plaster model, the impression board is formed:

- a base wax plate with a thickness of 2 mm and a height of no more than 10 mm is cut out. the height of the wax depends on the remaining teeth on the opposite side, but should not exceed them.

- wax plastic is cut along the entire length of the missing alveolar ridge,

- then the prepared base wax plate is poured onto the impression using an electric spatula or a simple spatula and an alcohol lamp,

- to exclude deformation of the model from the side of the prosthetic bed, the wax plate is poured "joint to joint" (Fig. 3);

- a plaster model is cast according to the prepared impression with the formed board;

- the model is opened (Fig. 4);

- the bead formed on the impression allows you to save and mark the boundaries of the removable denture

- the boundaries of the future prosthesis are applied to the model, the boundaries of the future prosthesis cannot be reduced due to the previously formed board (Fig. 5);

- according to the generally accepted technique, a partial removable plate prosthesis for the upper jaw with a clasp fixation was made (Fig. 6);

- partial removable plate prosthesis on the upper jaw with clasp fixation in the oral cavity (Fig. 7).

The creation of an impression flange using a base wax plate, 2 mm thick, ensures that the edges of the impression and the model boundaries are accurately obtained without damaging the prosthetic bed. A well-made working model of the upper jaw, preservation of the prosthetic bed increases the accuracy of the removable prosthesis manufacturing and, accordingly, creates favorable conditions for adaptation to the use of a removable prosthesis.

Claims (1)

A method for preparing an impression for casting a model of the upper jaw for patients with a resected alveolar ridge of the upper jaw, including preparing an impression from a silicone impression material and making an impression edge, characterized in that the edge of the impression is restored using a formed bead, which is made from a base wax plate 2 mm thick, in this case, the base wax plate is preliminarily cut out with a height of no more than 10 mm, not exceeding the height of the preserved teeth from the opposite side, and poured into the impression with a spatula and an alcohol lamp, while from the side of the prosthetic bed, the wax plate is poured "joint to joint", and from the opposite on the sides, the amount of wax is increased for better fixation of the wax plate during casting of the model.

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