SU1456135A1 - Method of producing removable dentures - Google Patents

Abstract

Isoretation refers to medicine, orthopedic dentistry, intended for prosthetics of patients with partial loss of tooth. bov. The goal is to show strength .- .. fastening artificial teeth with a skeleton by removing a functional impression (FO) and casting two identical models - plaster (GM) and from a refractory mass (ohm). Device 1 The invention relates to medicine and can be used in prosthetic dentistry in prosthetics of patients with partial loss of teeth. The purpose of the invention is to increase the strength of attachment of artificial teeth with a frame. The method is carried out as follows. According to the functional impression, two models are cast: one of the high-strength gypsum, the other of the refractory mass Solith, mark them up in the final phase of the image is placed in the lower part of the mold filled with gypsum. After the plaster has set, GM is removed. Also cast OM. Mark up the GM and OM in the parallelometer. On a GM, missing teeth are modeled from wax. Then they are replaced with truncated wax cones. The double comfort of the GM and on the ceramic model they simulate the wax composition of the framework, the shape of the cylinders and the cones. A frame is cast, an oxide film is obtained and the ground layer of ceramic teeth is burned. PM is cast in an article torus, a porcelain mass is applied to cylinder a, giving it a tooth shape. Then they burn the frame together with OM and model the basis of the prosthesis from wax. . Replace wax with plastic. Reducing the time to adapt to the prosthesis, increasing the chewing effectiveness is due to the individual modeling of artificial teeth. 7 il. i (/) meter, and before duplication, the plaster model is prepared by preliminarily modeling in the article the missing teeth from wax with the subsequent application of their longitudinal axes to its base. Then, the wax teeth are replaced by wax protrusions in the form of reverse truncated cones, focusing on the axes applied on the collar and antagonist teeth. The gypsum model is duplicated and the waxing composition of the skeleton is modeled on the obtained ceramic model, imparting 4ib CD O5

Description

the cone-shaped protrusions form the cylinders with the help of clasp wax, remove the framework from a cobalt-chromium-molybdenum alloy, obtain an oxide film on the framework, burn the ground layer of ceramic teeth and impart the framework to the refractory model from Xiolite. They model the models in the article in the position of the central occlusion, apply the porcelain masa to the cylinders, giving them the shape of bb, and bake them together with a model of refractory mass.

The method is implemented using a device comprising a base with a form installed on it, made of an elastic material and consisting of two parts with the possibility of fixing their position relative to each other, and a speck provided with shaped locks of position in the form of semicircular circumferences around the circumference and grooves on the perimeter of the crack.

The introduction of a preliminary modeling operation from a gypsum model of missing teeth will determine the size and position of the skeleton for fixing the ceramic mass, simulate the occlusal surface of the missing teeth in relation to the antagonist teeth, which later creates multiple occluster contact between them and therefore increases effective

ness chewing removable dentures. In addition, obtaining multiple occlusal contacts evenly distributes the chewing load on the tissues of the prosthetic bed, which helps to reduce the atrophy rate of the edentulous alveolar process, reduces the number of corrections and

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reduces the time to get used to the prosthesis. Modeling wax from protrusions in the form of inverse truncated cones, subsequently, after casting the framework of the prosthesis from a cobalt-chromium molybdenum alloy, creates cavities for fastening the plastic base of the removable prosthesis. Giving the projections the shape of cylinders resembling the stump of a prepared tooth under a metal-ceramic crown allows you to create the anatomical shape of the missing teeth from the ceramic mass with a specific thickness of the ceramic layer, which increases the strength of attachment of artificial teeth with the frame of the prosthesis

Fig, 1 shows the device, a general view; FIG. 2 shows modeled wax cones on a plaster model; FIG. 3 shows a skeleton of a solid removable denture with cylinders; FIG. 4 shows the device in operation; FIG. 5 is a view A of FIG. 1; Fig, 6 - device section; Fig 7 - then 10, top view.

The device consists of a base 1, on which a mold of elastic material is established. The form consists of two detachable parts: the bottom 15 and 2 and the top 3. In the lower part 2 of the form, the grooves are inserted into which the protrusions of the upper part 3 of the form enter when the form is made. On the upper part 3 of the form, a cover 4 is applied, which repeats the outlines of the form and is folded to securely maintain its position relative to the form. On the inner surface of the cover 4 there are three 5 clamps 5 in the form of semicircular protrusions. The locking pins are arranged uniformly along the CIRCLE, the specification of the polarity of the locking pins does not matter, the grooves 6 are made around the perimeter of the fastener. 0 The device works as follows. After obtaining a functional impression on the outer surface of an individual spoon, at the place of the intended position of the teeth, g surface discs are made with a length of 6-8 mm. Then, the lower part of the form is installed on the base of the device, it is filled with plaster and. . immerse the individual spoon with its outer surface. After the gypsum has hardened, the surface is covered with insulating liquid (izokolom, petroleum jelly), the upper part of the mold is installed and filled with high-strength gypsum using a vibrator. Immediately on the upper part of the form impose a cap so that the retainers are fully plunged into the plaster. This makes it possible to precisely form the base of the model in accordance with the inner surface of the crest and repeat the standard position of the models in the process of marking them in the parallelometer and placing the teeth in the articulator. Parts of the mold are separated, the plaster model is removed and the refractory model is cast from Ziolit in the same way. To extract the refractory model from the impression without damaging

one

her individual spoon is cut into pieces with a separating disc.

After casting the two models, they begin planning the framework of the removable denture on the plaster model. The bottom of this copying unit cover is installed on the paraplemeter's table, a gypsum model is fixed on it, respectively, on shaped protrusions, and is revealed by a known method of undercuts on the teeth and alveolar process. Not changing the position of the table, a refractory model is placed on a copying device, like a gypsum model, and boundary lines (dental and alveolar) are applied on it jme,

The blocking of undercuts is carried out on a refractory model under the control of pairs of an allelometer with a liquid-substituted (sieve-like) refractory mass of the same composition, but methylene blue tinted with contrast. This model is intended for firing ceramic teeth with a prosthetic frame.

For casting the metal frame of the prosthesis, a refractory model is obtained from Silamin through the usual duplication of the gypsum model. The preparation of the gypsum model for duplication has significant features. They are as follows: the gypsum model, together with the cap of the copying device, is fixed in the articulator in the position of the central occlusion and the missing teeth are simulated on it first from wax. Preliminary modeling of the teeth is necessary in order to determine the size and position of the skeleton for fastening both the ceramic mass and the base plastic. Therefore, after modeling the teeth from wax onto the vestibular surface of the gypsum model in the area of the edentulous alveolar process, a chemical pencil is applied to the line corresponding to the longitudinal axis of the artificial teeth.

By this, the gypsum model is removed from the articulator (the lid of the copying device remains in the articulator for the identical refractory model gypsum in it), wax models of the teeth are removed and the whole metal frame is insulated by the byugel wax. Thereafter, visually orienting on the lines plotted on the alveolar process.

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respectively, the longitudinal axes of artificial teeth molded from wax, simulate wax protrusions in the form of a truncated cone, directed by the base towards the chewing surface of future artificial teeth. The height of the protrusions is variable and depends on the height of the artificial teeth, which is determined by prior modeling from wax. Subsequently, after casting the frame in place of these protrusions, cavities are formed to attach the plastic base of the denture.

After obtaining a refractory model from Silamin, the framework of the future solid cast denture is modeled on it. In this case, the protuberances with the help of clasp wax are shaped into cylinders resembling the shape of a stump of a prepared tooth under a metal-ceramic crust. The metal frame after machining is checked in the oral cavity, and then an oxide film is obtained and the ground layer of the ceramic teeth is fired in a vacuum oven. Next, the frame is applied to the refractory model of Siolite and again in identical position, orienting to the shaped protrusions of the lid the devices are reinforced in the articulator; Then, artificial teeth are modeled from the ceramic mass and burned on the refractory model of Xiolit. Only the glazing of the porcelain mass is carried out without a model,

Cleaning the metal frame from the oxide film is performed on a sandblaster, but to protect the porcelain lining from erasing, the artificial teeth are covered with three layers of sticky plaster. After the porcelain is calcined and the oxide film is cleared from the oxide film, the prosthesis is transferred to a plaster model to model its wax base. The replacement of wax with plastic is carried out in a closed cell, equipped with a loading chamber for plastic, through feed channels. This allows you to prevent possible violations of the occlusion of the teeth. With the help of the proposed method, it is possible to individually simulate the chewing surface of artificial ones. the teeth in relation to the antagonist teeth, which allows to obtain multiple contacts with various movements of the lower jaw and evenly distribute the chewing pressure, which prevents their breakage.

The presence of cavities in the cylinders provides a stronger connection of the plastic base with the frame, the copying device makes it possible to obtain identical models and fix them in the same position in the parallelometer and the gypsum into the article - trr.

Claims (1)

Formula from. gaining A method of making removable dentures by taking an impression, casting models followed by marking in a parallelometer, duplicating a model, making a wax composition of a skeleton, casting it, modeling a wax base and replacing wax with plastic, in order to increase the strength of fixing artificial teeth with a skeleton, before duplicating on a plaster model, missing teeth are modeled from wax, with their longitudinal axes applied to the model base and then replaced with wax projections in the form of deleterious truncated cone, and in the modeling wax composition carcass tapered projections shaped cylinder. Fi.9.1 FIG. 2 Fig.Z figl view f ( B  I TG 1I that) Phie. P yyyy 6W fig