RU35709U1 - A device for replacing a crown of a tooth containing a composite material and a reinforcing element - Google Patents

Description

The invention relates to medicine. Namely, to dentistry.

It is known. That for restoration of the crown part of the tooth with a preserved root in dentistry, artificial crowns are used based on cult or pin designs. Direct and indirect restorations of light-cured composite materials

additionally reinforced with glass ionomer cements, chemical curing composites and various pin designs (posts) 1,2.

A known method of using anchor pins fixed in the root canal of a tooth with cement. With the subsequent restoration of the crown part with composite filling materials (3).

We took this design as a prototype.

The disadvantages of this method is that:

-pretentia of the pin is drained; it is only due to the filling material, therefore, when fixing the hooks, large internal stresses may occur, leading to root disruption;

- the effect of a “wedge that occurs in the apical part of the tooth during overload can cause a root split;

-absorption of cement leads to a violation of the fixation of the pin;

- the need for preparation and expansion of the root canal for fixing the pin leads to the source of the walls of the root and the deterioration of the mechanical strength of the root;

- limited use in obstructed or severely damaged canals;

insufficient mechanical strength of the structure associated with the small area of contact of the pin, composite material with tooth tissues;

the complexity of installing the pins 4.

The aim of the invention is the restoration of composite materials of the crown part of the chewing group of teeth in its complete absence using a stainless steel wire mesh; they began to steel it without resorting to using additional elements fixed in the root canal of the tooth (leaving this method redundant).

The essence of the technique:

The proposed method involves preliminary endodontic treatment of the tooth. Root canals should be sealed to the apex and not have periapical changes. After gum retraction, a root cone adjacent to the gum is treated with a thin conical diamond head. Subsequently, the root part of the tooth is prepared with a spherical bur, forming a cup-shaped cavity. Then the tooth is subjected to acid etching. After thorough rinsing with water, the surface is dried. Apply adhesive twice with a brush and polymerize. Then, with the composite material intended for the restoration of chewing teeth, the crown walls are formed to the equatorial part with a thickness of 1-1.5 mm. Polymerized. Then, additional retention points are formed with the wheel-shaped boron from the inner surface of the restored part of the tooth and in the remaining root part within the dentin around the entire circumference of the tooth.

For the manufacture of the metal part of the proposed design, a stainless steel mesh 0.2 mm thick is used to reinforce the base plates. The metal mesh is selected to the required size and with the help of a stopper create a shape that repeats the inner surface of the restored

the cavity of the tooth, so that the outer surface of the mesh fits snugly against the inner surface of the prepared cavity. In height, the metal part should not exceed the equator of the tooth crown. The mesh is subjected to acid etching, adhesive treatment, followed by applying a masking agent, while maintaining through porosity.

At the bottom of the prepared tooth cavity, after etching and processing with adhesive, a fluid composite is introduced and at the same time a mesh is placed, pressing it to the bottom. The polymerization is carried out in the following sequence: first from the buccal, lingual, and then from the chewing surface. After fixing the metal mesh, the final restoration of the crown part of the tooth is carried out using the restoration system for chewing teeth. Before polishing and control polymerization, occlusal editing is carried out. The advantage of the proposed design is that:

mechanical strength increases, shrinkage decreases, and the marginal fit of the composite improves;

chips of composite material are prevented;

with the act of chewing, a uniform distribution of the load on the remaining dental tissue occurs;

access to the channel is preserved (if necessary, you can perforate the metal mesh);

simplicity of manufacturing a metal mesh.

Examples.

Patient K., 32 years old, turned to the dentist with complaints of complete destruction of the crown | 6 tooth. According to the words, | 6 tooth was previously treated for complicated caries.

Objectively: the crown | 6 tooth is completely destroyed. Percussion is painless. There are no periapical changes on the X-ray of | 6 tooth, the canals are sealed to the apex.

Treatment: after gum retraction, the root part adjacent to the gum is treated with a thin conical diamond head, and the inner surface of the tooth is prepared with a spherical bore, forming a cup-shaped cavity. The cavity is treated with acid. After thorough rinsing with water, the surface is dried. They double-pan the adhesive with a brush and polymerize. Then, with the composite material intended for the restoration of chewing teeth, the crown walls are formed to the equatorial part with a thickness of 1-1.5 mm. Polymerized. Then, additional retention points are formed with the wheel-shaped boron from the inner surface of the restored and root parts along the entire circumference of the tooth. A 0.2 mm thick stainless steel mesh is bent using a plug screw, approximating the shape to a tooth half-crown, so that the outer surface of the mesh fits snugly against the inner surface of the prepared cavity. The mesh is subjected to acid etching, adhesive treatment with subsequent application of a masking agent, while maintaining the porosity of the mesh. After etching and treating it with adhesive, a flowable composite is introduced into the prepared tooth cavity, and at the same time, a mesh is installed with subsequent polymerization. Further, using the restoration system for chewing teeth, restore the walls and chewing surface. After restoration of all the hillocks, grinding, polishing and final polymerization are carried out.

Sources of information.

1. Kopeikin V.P. Guide to orthopedic dentistry. M-1998., S. 496.

2.Nikolaev A.I., Tsepov L.M. Practical therapeutic dentistry. / St. Petersburg-2001

3.JordanR.E. // Composite filling and facing materials in dentistry. A.V. Borisenko, V.N. Not without reason. / Kiev-2001., S.200.

4. Svetlov A.V., Kozlova S.I., Peter Dukart. Experience with Cosmopost root pins. // Institute of Dentistry. March 2000

Claims (1)

A device for replacing the crown of a tooth containing a composite material and a reinforcing element, characterized in that the reinforcing element is made in the form of a 0.2 mm thick stainless steel mesh and coated with a masking agent, while the reinforcing element has a shape and size that repeats the surface of the cavity being restored Tooth, a flowable composite is used as a composite material.