BG2391U1 - An injection press for removable acrylic plaque dentures - Google Patents

Abstract

The method is applied to the manufacture of whole plaque dentures in dental treatment of patients with a reduced teeth count. For one working cycle of the devices are manufactured a single set of dentures. It is comprised of a notable injection press for acrylic plastics (an injection module) and a polymerization device (polymerization module, which takes part in the heat polymerization and the cooling of the acrylic plastic). The polymerization module includes a fixed frame with a screw press (1), previously injected with acrylic plastic, in which a cuvette (2) with a plaque prosthesis (3) is placed. In the upper part of the cuvette (2) is placed a holder (4) in which a capsule (5) containing pre-mixed acrylic plastic goes in. According to the utility model on top of the cuvette (2) via two fixing brackets (7’), ensured by the fixing bracelet (8’) and a screw press (14), is placed a lid (15) with a seal (16) and a power outlet for high pressure (12)

Description

Field of technology

The utility model is used in the manufacture of removable plaque prostheses for the needs of dental treatment of patients with missing teeth.

Another application of the utility model is for the needs of large dental laboratories, such as those at the faculties of dental medicine, where it is necessary to make a large number of removable prosthetic structures in a short time.

BACKGROUND OF THE INVENTION

The prototype of the offered device is known from the prior art / 1 and 2 /. Existing devices for injection molding of acrylic plaque prostheses consist of a cuvette in a fixing frame with a screw press. At the top of the cuvette is a capsule holding a standard capsule with a material (acrylic plastic). A pneumatic cylinder with a high-pressure supply outlet is attached to the cuvette by means of two fixing brackets provided by a fixing bracelet.

The efficiency of the known devices for injection molding of acrylic plastics is limited by the fact that only one prosthesis is made for one working cycle, and this takes a total of about 90-100 minutes, which leads to more expensive prostheses. In these devices, the initial injection molding takes 5 minutes, after which the device is placed in a vessel with water, during the heating of which the polymerization of acrylic plastic takes place, lasting 35 minutes after boiling the water. Cooling lasts about 30 minutes, and it is recommended to maintain the pressure for the first 20 minutes.

Another limitation of the known devices is that the capsules used are disposable, which leads to overconsumption of acrylic plastic.

Technical essence of the utility model

The technical problem that needs to be solved is to create such a device for serial production of removable prosthetic structures, which will optimize the life cycle of existing devices and reduce the cost of manufacturing plaque prostheses.

The problem is solved by using the known device for injection molding of acrylic plastics (injection module) and their subsequent polymerization in the newly created device for polymerization (polymerization module, because it participates in the thermal polymerization and cooling of acrylic plastics).

The known device for injection molding of acrylic plastics (injection module) consists of a pneumatic cylinder with control, a manometer for reading the value of pressure, a high-pressure supply outlet, a piston of the pneumatic cylinder. The pneumatic cylinder is attached to the cuvette by means of two fixing brackets provided by a fixing bracelet. The cuvette, in which the plaque prosthesis is pre-packaged, is placed in a fixing frame with a screw press. At the top of the cuvette is a capsule holder in which is placed a capsule with pre-mixed material - acrylic plastic.

The problem is solved as the pneumatic cylinder after the initial injection of acrylic plastic is replaced by a sealed lid with a high pressure supply outlet and this is a polymerization module. It consists of a cuvette, a capsule holder and a capsule with the remainder of the material, which are elements of the injection module. The developed lid with a seal is fixed to the cuvette, which is pressed with a screw press by means of two fixing brackets and the fixing bracelet providing them. A high pressure supply outlet is attached to the cover.

The advantages of the utility model are a significant reduction in time and production costs, respectively. Only one injection module is needed, which is engaged for 5 minutes in the initial injection molding of acrylic plastic in the cuvette. The proposed sealed lid is then fixed to the cuvette and this is the polymerization module, which is involved in the thermal polymerization and cooling of the plastic, which takes about 90 minutes. During this time, the injection module is free for initial injection

2391 UI pressing the next cuvette.

Thus, for the time of about 90-100 min, which is necessary for the production of a removable plaque prosthesis with the existing devices, with the offered device at least 15 removable plaque prostheses can be made in succession.

The shortened production time respectively reduces the production costs, because in this way the amount of pre-mixed plastic is used much more fully and the residue that is discarded is significantly reduced.

An advantage of the introduction of a sealed lid, which replaces the action of the pneumatic cylinder, is that it allows a large number of cuvettes to be injected with acrylic plastic from one pneumatic cylinder, and then continue the process of thermal polymerization of plastic and cooling.

Explanation of the attached figures

An exemplary embodiment of the utility model is shown in the attached figures, where:

Figure 1 is a cross-sectional view of an injection module;

Figure 2 is a cross section of a polymerization module;

Figure 3 is a sketch showing the connection between only one device, representing the injection module, and the n-number of polymerization modules, providing serial production of removable plaque prostheses.

Examples of implementation of the utility model

According to the exemplary embodiment, the prototype of the future acrylic prosthesis prepared by a dental technician is packed in both halves of the cuvette. After further processing, a cavity is formed inside the closed cuvette, an exact copy of the plastic part of the future prosthesis 3.

The injection module shown in FIG. 1 has the following construction. It consists of a cuvette 2, which is placed in a fixing frame with a screw press 1. At the upper end of the cuvette is a capsule holder 4, in which is placed a capsule 5 with pre-mixed acrylic plastic 6. By means of two fixing brackets 7 and a fixing bracelet 8, a pneumatic cylinder 9 is attached to the cuvette. The pneumatic cylinder is equipped with a manometer 11 and valves for its control 10.

The polymerization module shown in FIG. 2 has the following device.

A lid 15 with a seal 16 is fixed to the cuvette 2, in the holder 4 of which the capsule 5 with the rest of the material 6 is located, which is pressed by a screw press 14 with two fixing brackets 7 'and a fixing bracelet 8'. A high pressure supply port 12 is attached to the cover 15. The polymerization of the acrylic plastic is carried out in module 21 with heating water 22.

The screw press of the injection module is tightened at a pressure of 15 Nm, which provides up to 10 bar pressure and prevents the opening of the cuvette when injecting plastic at a pressure of 6 bar throughout the polymerization process.

The screw press of the polymerization module provides fixing of up to 10 bar pressure, and the high pressure supply port maintains a pressure of 6 bar during the entire polymerization process.

The separation of the cuvette 2 together with the capsule 5 and the fixing frame with the screw press 1 from the pneumatic cylinder 9 must be performed not after the cooling process, as in the existing devices (after about 90 min), but after the injection of the cuvette ( after 5 min).

The two modules - the injection and the polymerization, are technically interconnected elements of the device, first using the injection module, and then the polymerization in the manufacture of removable plaque prostheses.

Using the utility model

The utility model is used as follows.

By means of a valve 10, compressed air 6 bar is supplied and the cylinder injects the plastic into the cuvette through its piston 13 and the piston of the capsule 17. Through the same valve, air is supplied in the opposite direction and the cylinder removes the piston from the capsule. The fixing bracelet 8 is lifted and the fixing brackets 7 are released. The cuvette 2 together with the capsule 5 and the fixing frame with a screw press 1 are separated from the pneumatic cylinder.

2391 UI

A lid 15 with a seal 16 is fixed to the cuvette 2, in the holder 4 of which remains the capsule 5 with the rest of the material 6, which is pressed with a screw press 14 with two fixing brackets 7 'and a fixing bracelet 8'. The screw press provides fixing up to 10 bar pressure. A high pressure supply port 12 is attached to the lid 15, which maintains a pressure of 6 bar during the entire polymerization process.

The polymerization of acrylic plastic takes place in heating water. This is the polymerization module (Fig. 2) and by means of the sealed lid, which replaces the pressure of the pneumatic cylinder and ensures constant injection of plastic during the whole polymerization process, it is possible to separate injection molding processes and subsequent heat polymerization of acrylic plastic. Thermal polymerization ends with cooling. Thus, with the same pneumatic cylinder and the n-cell cuvettes with sealed lids and fixing frames, the n-number plaque prostheses can be mass-produced at the same time (Fig. 3).

Claims (2)

Claims A polymerization module comprising a fixing frame with a screw press (1) in which a cuvette (2) with a plaque prosthesis (3) pre-injected with acrylic plastic is fixed, with a holder located in the upper part of the cuvette (2) ), in which a capsule (5) with pre-mixed acrylic plastic is placed, characterized in that on the cuvette (2) by means of two fixing brackets (7 ') provided by a fixing bracelet (8') and a screw press (14) , a cover (15) with a seal (16) and a high pressure supply outlet (12) is placed. Application: 3 figures Literature 1. Stoeva I., Abadjiev Μ. Ivoclar's I vocap technology - a guarantee for high mechanical strength of whole prostheses. KSF and UXO, Sofia, 2009, issue 1, pp. 36-39. 2. Abadzhiev M. Comparative characteristic of the mechanical strength of complete dentures performed by standard technique and Ivocap technology, Journal of IMAB - Annual Proceeding (Scientific papers) 2009, book 2, p. 36-39.