RU2268023C1 - Method for manufacturing prefabricated cast pin stump insert - Google Patents

Abstract

FIELD: medical engineering.

SUBSTANCE: method involves preparing multi-root tooth canals, taking imprint and modeling pin insert stump. To model the first insert part having matrix lock piece and two parallel pins for poorly passable canals, fast-hardening ash-free plastic is used. To model the second insert part having patrix lock piece and a pin for well-passable canal, solid-melted wax is used. The matrix part is milled as cylinder in parallel to well-passable canal pin axis. The patrix part is congruent to the matrix one. Both parts are substituted with metal parts and part-by-part fixed on the tooth at the same time, assembling the whole insert.

EFFECT: high reliability in repairing multi-root tooth; long service life; simplified fixation process.

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Description

The invention relates to medicine, namely to orthopedic dentistry, and can be used for prosthetics of significantly destroyed multi-rooted teeth with convergence or divergence of roots.

There is a method of prosthetics with a pin tooth with an artificial stump made of metal (Trifonov I.D., Zholudev S.E. Patent of the Russian Federation No. 2223715 dated February 20, 2004 according to application No. 2002116378/14 dated June 17, 2002); collapsible molded cult tabs on multi-rooted teeth (Yushmanova T.N., Davydova N.G., Drachev S.N., Chudin A.A. Proceedings: All-Russian Scientific and Practical Conference "Education, Science and Practice in Dentistry" - M ., 2004 .-- S.302-305). But in these cases, the tabs are modeled in the patient’s oral cavity, the modeling process is time-consuming, which causes significant inconvenience to the patient and the doctor.

The clinical method for manufacturing collapsible cult tabs was taken as a prototype of the method for manufacturing a cast prefabricated pin stump tab. Shcherbakov MV, Tlustenko VP, Belanov GN // Medical business - No. 7 (97) - 2002. - P.26 (Dentist-practitioner No. 3), including the preparation of root canals, modeling wax pins of poorly passable canals, replacing them with metal ones, fitting pins in tooth canals, metal ones badly passable and ashless plastic in well-passable, modeling of an ashless plastic tab in the oral cavity, removing metal pins from the tab, replacing the plastic with metal, fitting the tab and pins through the holes in the tab, fixing the tab to the main pin and tional.

The disadvantages of the prototype are the complexity of the doctor’s work, the pins that are inserted through the holes in the tab cannot provide good long-term fixation of the tab, the fixation moment is very complicated and requires a lot of experience, and it is also not clear how the holes are formed in the tab when replacing plastic with metal.

The technical result, the achievement of which the creation of this invention is directed, is to increase the reliability of restoration of the stump of a destroyed multi-root tooth for the further manufacture of an artificial crown, extend the life of the stump tab (almost unselected), simplify the fixation phase of the tab, ease of work for the doctor.

The essence of the invention lies in the fact that in the method of manufacturing a cast prefabricated pin stump tab, including preparing the channels of multi-root teeth, impression, casting the model, modeling the stump of the pin tab, while modeling the first part of the tab with the matrix part of the lock and two parallel pins for poor passable channels use quick-hardening ash-free plastic, and to simulate the second part of the tab with the patric part of the lock and a pin for a well-passable channel use carbide wax, the matrix part are milled of a cylindrical shape parallel to the axis of the pin of a well-passable channel, and the patric part is performed congruently with the matrix, both parts are individually replaced with metal and fixed to the tooth in parts at the same time, collecting a single tab.

A method of manufacturing a cast prefabricated pin stump tab is as follows.

The remains of the tooth stump and root canals are prepared: two canals (worse passable) to a depth of 3-4 mm, trying to bring them to parallelism, and well passable by 2/3 or more. Three standard pins are selected (fitted), for example, from plastic or wire. The pins with the corrective mass of silicone material (Spidex) are introduced into the root canals (in the mouth) and a two-layer impression is taken, after which the pins go into the mold. The model is made of super gypsum using the resulting print. On a gypsum model made of quick-hardening ashless plastic ("Pattern-Resin"), the first part 1 of the tab (Fig. 1) is modeled on two parallel pins 3 of poorly passable channels, then in a parallelometer, a matrix 2 (part of the lock) of a cylindrical shape parallel to the axis is milled a pin of a well-passable channel 5. Coat the manufactured part of the plastic tab with a separation varnish. Next, from the carbide wax, the second part 4 of the tab is modeled (FIG. 2) using a pin of a well-passable channel 5 with the patric part of the lock 6, a congruent matrix. The simulated parts of the assembly tab are removed from the model and individually replaced with metal in a known manner. They process both parts of the tab and fit them first on the model, then in the oral cavity (separately and together). The finished tab (Figure 3) is fixed in parts per tooth, first the first part 1 with two parallel pins 3 and matrix 2, then the second part 4 with a pin for a well-passable channel 5 and patric 6. For fixing it is better to use Fuji cement. After this, a crown is made on the stump of the tooth.

Depending on the anatomical structure of the multi-root tooth (upper or lower jaw) and the location of the mouths of the root canals, it is possible to change the location of the patric and matrix parts of the castle. Matrix part on two parallel pins, and patric part on one pin.

Clinical example: patient K., 26 years old, turned to the orthopedic dentistry clinic with complaints of impaired chewing function and fracture of the crown 36 (WHO classification) of the tooth. The tooth has been repeatedly treated for tooth decay and its complications. Objectively: the crown 36 is destroyed by 2/3, on the R-gram the root canals are completely sealed to the apex, there are no inflammatory processes in the near-root tissues. It was decided to manufacture a 36 cast prefabricated pin stump insert with the subsequent manufacture of a ceramic-metal crown.

The remains of the tooth stump and root canals were prepared: two channels (worse passable) to a depth of 3-4 mm were tried to bring them parallel, and well passable by 2/3. Picked up three standard plastic pins. The pins with the corrective mass of silicone material (Spidex) were inserted into the root canals (in the mouth) and a two-layer impression was taken, after which the pins went into the mold. Based on the resulting print, the model was cast from super gypsum. Due to the close proximity of the root canal mouths to the gypsum model made of quick-hardening ashless plastic ("Pattern-Resin"), the first part of the tab was modeled using two parallel pins of poorly passable channels, then a cylindrical matrix (part of the lock) was milled on a plastic tab in a parallel tab parallel to the pin axis of a well-passable channel. The manufactured part of the plastic tab was coated with a release varnish. Next, from the carbide wax, the second part of the tab was modeled on a well-passable channel with the patric part of the castle, a congruent matrix. The simulated parts of the assembly tab were removed from the model and individually replaced with metal. We processed both parts of the tab and stored them first on the model, then in the oral cavity (separately and together). The finished tab was fixed in parts per tooth, first part with patricia, then part with matrix. Fuji cement was used for fixation. After that, a ceramic-metal crown was made on a tooth stump.

A method of manufacturing a cast prefabricated pin stump tab was used in 12 patients. During the follow-up examination after 1-2 years, patients have no complaints, the prosthesis is in good condition.

Claims (1)

A method of manufacturing a molded prefabricated pin stump tab, including preparing the canal of multi-rooted teeth, imprinting, modeling the stump of the pin tab, in this case, quick-hardening ash-free plastic is used to model the first part of the tab with the matrix part of the lock and two parallel pins for poorly passable channels, and for modeling the second parts of the tab with the patric part of the lock and a pin for a well-passable channel use carbide wax, the matrix part is milled with a cylindrical plate The frames are parallel to the pin axis of the well-passable channel, and the patrician part is performed congruently with the matrix, both parts are individually replaced with metal and fixed on the tooth in parts at the same time, collecting a single tab.

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