Method for manufacturing one-piece stump pin insert

FIELD: medical engineering.

SUBSTANCE: method involves preparing dental supraradical part and canal, taking double imprint, molding gypsum model, modeling the pin and insert with wax on the model, substituting the wax pin insert with metal one, fitting and fixing the insert on the tooth. Tooth root bottom is prepared as hemisphere and the pin tip is modeled from wax of the same shape. Stump part of the insert is modeled to give it lateral surface convergence angle from 5 to 10° towards the median tooth axis.

EFFECT: facilitated modeling process.

2 cl, 4 dwg

 

The invention relates to medicine, namely to prosthetic dentistry and can be used in prosthetics significantly damaged teeth.

There is a method of manufacturing a cast core pin tab (Vol. Clinical and laboratory ground orthopedic treatment of decayed teeth plasmalemma pin designs. - M., 1999. - P.26-26. The dissertation on competition of a scientific degree of candidate of medical Sciences), pointing to the need of making the pin has a cylindrical shape.

For the prototype of the method of manufacturing a cast of cult pinned tabs taken molded pin tab with superiority pin (Dentistry. The textbook/ Under the editorship of professors Vntruth and Sderotnews. M: Medical book, 2003. - s-283).

Disadvantages:

1) the difficulty in obtaining a wax model of the pin with the tab in this form of the channel, as in the simulation in the area of the corners of the stairs and the bottom of the root canal of the tooth remains part of the wax;

2) step pin contribute to the split of the root of the tooth, especially when lateral loads;

3) there is a large effect of the piston when the fixing tab into the root canal with liquid cement (hydraulic pressure), which contributes to the destruction of the root.

The purpose of the invention: improvement of convenience modeling of the pin from wax, slimming the trauma of the tooth root, the improved fixation of artificial crowns on the cult.

The invention is a method of manufacturing a cast core pin tabs, including dissection of the head part and the canal of the tooth, removing the double impression, casting models from plaster, modeling pins and tabs wax on the model, replacing the wax with a pinned tab on the metal, fitting and fixing tabs on the tooth, is that the bottom of the root canal of the tooth disassembled in the form of a hemisphere and, accordingly, the end of the pin is modeled wax similar form, and the core part of the tab is modeled with an angle of convergence of the side surfaces toward the median axis of the tooth from 5 to 10°, while the less than the height of the stump, the smaller the angle of convergence of the side surfaces of the stump. The proposed method facilitates the process of modeling wax design tab, prevents excessive impact of traumatic stress on the tooth root, improves the retention of the artificial crown on the cult.

A method of manufacturing a cast core pin tab is as follows. At the beginning of the disassembled supragingival part of the tooth: fragile, thinning, softened wall crowns zashlifovyvajut to gum level. Then (1) proceed with the treatment of the root canal (1) tooth: fissure Burr (2), corresponding to the size of the root canal (1) the tooth is, expand the channel (3) to the desired depth (2/3 length). For the formation of the (2) bottom (4) of the channel (3) root (1) use spherical boron (5) of the same diameter as the previously used fissure Bor (2). Preparation of the bottom (4) ball boron (5) is immersed to a depth corresponding to its radius to obtain hemisphere.

In the root canal pin is stuck analog pin, for example made of plastic, remove the double impression and send it to the laboratory, where the cast is molded model of plaster.

The model tab on the model (figure 3), and supragingival part (6) is modeled in wax with the angle of convergence of the side surfaces toward the median axis of the tooth from 5 to 10°while less than the height of the stump, the smaller the angle of convergence, and the wax rod (7) fully conforms to the shape of the prepared canal (3) of the tooth root (1) - parallel walls, the end (8) of the pin (7) has the shape of a hemisphere. We experimentally and in practice it is established that the smaller the height of the stump tab, then you want a smaller angle of convergence of the side surfaces for better fixation of the artificial crown on the cult of the tab.

After replacing the wax on the metal ready copings (9) pin is stuck in the channel (3) of the tooth root (1) and fix with liquid cement (figure 4).

Clinical example. Patient K. 23 years came to the clinic of orthopedic dentistry with the complaint and on the aesthetic defect in the anterior dentition, the diction.

Objectively: the crown 21 of the tooth is destroyed 2/3 of the tooth previously cured about pulpitis. Percussion is painless, root resistant. On the radiograph root length greater than the crown of the tooth, the walls are of sufficient thickness, the channel is completely obturated to the top, changes in the periapical tissues are not available.

Decided to make Celerity stump pin tab on 21 teeth with subsequent prosthetic metal-ceramic crown.

Conducted by grinding destroyed the edges of the crown of the tooth to the gums. Fissure boron corresponding to the size of the root canal of the tooth, extended channel 2/3 length. The bottom of the root canal formed in the form of a hemisphere with the help of spherical boron same diameter as the previously used fissure Bor. In the channel prepisovan similar pin, double shot mold and transferred to the laboratory. Obtained from the laboratory of the finished molded core pin tab prepisovan and fixed with cement. The convergence of the side surfaces of the head part of the tab (stump) was 6°. Tab fabricated metal crown by well-known methods.

The patient was observed by us in the course of 1 year. The result is good.

A method of manufacturing a cast core pin tabs used in 38 patients and received a positive result is s.

1. A method of manufacturing a cast core pin tabs, including dissection of the head part and the canal of the tooth, removing the double impression, casting models from plaster, modeling pins and tabs wax on the model, replacing the wax with a pinned tab on the metal, fitting and fixing tabs on the tooth, characterized in that the bottom of the root canal of the tooth dissect in the form of a hemisphere and, accordingly, the end of the pin model from wax similar form, and the cult of the tab of the model with the angle of convergence of the side surfaces toward the median axis of the tooth from 5 to 10°.

2. The method according to claim 1, characterized in that the smaller the height of the stump tabs, the smaller the angle of convergence of its side surfaces relative to the median axis of the tooth.



 

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