RU106524U1 - NON-METAL CULTURAL PIN PIN TAB - Google Patents

Abstract

 Non-metallic stump pin insert, including the stump part and the intra-root pin, characterized in that the stump part and the intra-root pin are made in a single structure of a composite reinforced with fibrous materials; technological operations for its manufacture are performed outside the patient's oral cavity.

Description

The utility model relates to medicine, namely orthopedic dentistry, and can be used in the restoration and prosthetics of the crown of significantly damaged teeth.

Direct methods are known for restoring the destroyed crown of a tooth using a fiber-reinforced composite, which consists in restoring the destroyed part of the crown directly in the oral cavity. Direct methods include mechanical and adhesive treatment of the root canal of the root surface, the introduction of fiber material and composite paste into the root canal of the tooth, the formation of the stump from the remains of fibers and composite paste (scientific and practical journal "New in Dentistry" 8/97 (58) .- C .35-38).

The disadvantage of these methods is polymerization shrinkage, the long duration of the patient's stay in the chair, which causes significant inconvenience. In addition, there are quite large difficulties in restoring teeth with subgingival destruction of the hard tissues of the tooth associated with the need for preliminary correction of the gingival margin (excision of the gum).

Indirect methods involve preliminary casting of the prosthetic bed with subsequent laboratory manufacturing of a metal reproduction of the stump tab with a pin (Guide to Orthopedic Dentistry / Edited by V.N. Kopeikin - M .: Triada-X, 1998. - 496 s).

The main disadvantages of the method: the presence of metal in the oral cavity, the duration and complexity of manufacturing, the difficulty of removing the structure if necessary.

Close in technical essence is a method of manufacturing a solid cast stub pin tab (patent No. 2252728 (RU), from 2003.11.24), including the preparation of the root part and the canal of the tooth, removal of the double impression, casting the model from gypsum, modeling the pin and the wax tab on the model, replacing wax pin tabs on metal, fitting and fixing tabs on the tooth.

The disadvantages of the method: the presence of metal leads to the release of ions and the creation of electrochemical pairs in the oral cavity, the complexity of processing and removing the structure, if necessary, is impervious to light, which limits the use in cases of subsequent prosthetics by structures with high light transmission, for example, non-metal ceramics.

The goal - the development of a cult tab with a pin that allows you to fully restore the functional and aesthetic standards during subsequent prosthetics with all types of fixed orthopedic structures, including those with high light transmission, the ability to choose the color of the stump; reducing the patient’s time in the chair, reducing the time and labor of doctors and dental technicians when processing the tab, eliminating the ingress of metal ions into the oral cavity. The proposed model allows to exclude toxic reactions to metals, corrosion of the tab, electro-galvanic syndrome, reduce the traumatic load on the root due to the shock-absorbing properties of the material.

The proposed model is used to restore the destroyed coronal parts of the teeth of all groups treated endodontically.

The general scheme of the utility model includes the following elements: the cult part of the structure made of a composite reinforced with fibrous materials (1), an intra-root pin based on fiber material (2), an artificial crown (3), a tooth root (4), a tooth root ledge (5), supporting pad in the root of the tooth (6), endodontic filling (7), a layer of adhesive composite material (8).

The cult part (1) and the intra-root pin (2) are made as a single structure, covered with an additional layer of fixing material (8).

The difference of the proposed design lies in the technology of its manufacture and use as a structural composite reinforced with fibrous materials used in dentistry as restorative, fixing and reinforcing materials.

In the previously treated root canal with an endodontic filling installed (7), the mouth of the root canal is expanded, a support area (6) of round irregular shape is formed over the mouth of the root canal with a size of 2 mm to 5 mm, depending on the volume of stored hard tooth tissues. The formation of such a platform allows to improve retention and evenly distribute the occlusal pressure on the tooth root (4).

After the preparation, the impression is taken using any silicone materials intended for this purpose. A model is made from the print, a pin and a cult part of the structure are formed from a composite reinforced with fibrous material, polymerization is carried out on the model. This technology allows you to get a single design that faithfully reproduces the relief of the root canal and the surface of the root support area. Next, processing, fitting and adhesive fixing of the structure to the tooth is carried out using a layer of composite fixing material (8).

The final stage of using the proposed design is the coating with an artificial crown (3).

The utility model developed by us allows, in comparison with the direct method of tooth restoration using a composite reinforced with fibrous materials, to improve the edge fit of the structure and reduce the stress in the contact zone between the composite and hard tooth tissues by compensating for polymerization shrinkage with a layer of fixing material. Our proposed tab, due to its manufacturing technology, eliminates the possibility of incomplete polymerization when using more powerful light and temperature effects in the laboratory, eliminates the ingress of residual monomer into the oral fluid or oral cavity and helps to strengthen the structure.

In comparison with the cast stump insert, our design eliminates the use of metal, provides light transmission and the ability to choose the color of the stump part of the tooth, which is important when prosthetics are made with translucent structures, for example, plastic, all-ceramic; significantly simplifies and accelerates the laboratory stage of the construction. In addition, there is amortization and a more uniform distribution of the occlusal load on the root of the restored tooth.

The design proposed by us was used in the restoration of teeth in 20 models and in 7 patients (see table).

Table The results of the verification of the model of non-metallic cult pin tabs Indicator Metal cast stump tab with pin Direct restoration Proposed model Number of observations fifteen 37 10 Average patient stays in the chair 40 minutes 90 minutes 33 minutes Light transmission absent is available is available Number of visits to complete the restoration of the tooth 2 one 2

The proposed utility model allows to reduce the cost of the restoration procedure for the patient by reducing the working time of the doctor and technician, eliminating casting from the manufacturing process.

Description to drawings

Figure 1. Scheme of non-metallic stump pin tabs.

1 - the stump part of the structure of a composite material reinforced with fibrous material,

2 - intra-root pin based on fiber material,

3 - artificial crown,

4 - the root of the tooth,

5 - ledge of the root,

6 - reference pad at the root of the tooth,

7 - endodontic filling,

8 - layer of adhesive composite material.

Claims (1)

Non-metallic stump pin insert, including the stump part and the intra-root pin, characterized in that the stump part and the intra-root pin are made by a single structure of a composite reinforced with fibrous materials; technological operations for its manufacture are performed outside the patient’s oral cavity.