BRIEF DESCRIPTION OF THE PRIOR ART Such a wedge has become known made of plastics, which has a shape of triangle prism, in the body of which concavities have been made and bodies reflecting the light have been incorporated aiming to achieve the reflection and dissipation of the light when used with transparent matrices and light curing filling materials. The anterior end of this interdental wedge is shaped like the tip of the ski. The posterior end is finished with vertical wall. The surface of the section of this vertical wall is 1.6 to 1.9 times larger than the surface of the section of triangle prism. Geometry and correlation between sections is predisposition and relevant measure for enhancing the intensity of the light flow inside the working part of the wedge (US Pat. 4631030).

The other interdental wedge is known, the working part of which is similar to this of above mentioned wedge, but the posterior end of this wedge is combination of consecutively fused cut pyramid and prism. The working part of this wedge has several layers made of different materials. Base is made of wood and polymer. Over the base there is thin white polymer layer which reflects the light. The third most superior layer is made of clear polymer and it serves to conduct the light to and from the reflecting layer. Surface of the section of the holding part is 2.0 to 3.5 times larger than the surface of the section of working triangle shaped part (US Pat.

5743738).

There is a third known interdental wedge similar to the first one described above which is made from only one polymer material. The posterior end of this wedge is shaped like a thin neck with many walls. This neck continues in a larger head with many walls, too. The surface of the section of the holding part is 0.5 to 0.8 times of the surface of the section of wedge's working part (US Pat. 5890901).

The fourth known interdental wedge has a shape similar to the first one described and is made of clear polymer material. On the walls of the working part of the wedge few semi sphere concavities have been made to make possible the dissipation of the light falling over them. The posterior end of this wedge has the following design: the vertical wall of the triangle prismatic body continues into a thin parallelipiped shaped plate. This plate further continues into a prism fused further to a cylinder body with concentric hole inside. Surface of the section of the holding part is 1.4 to 3.1 times larger than the surface of the triangle prismatic working body (Mabege GmbH-Germany).

SUMMARY OF THE INVENTION The new interdental wedge to the present invention comprises the combination of triangle prismatic shaped body and solid prismatic shaped or cut pyramid shaped solid part with incorporated hole. Triangle prismatic shaped body walls'surface has been micro roughened and its anterior end is shaped to the ski-like arch, while its posterior end is connected to a prismatic shaped or cut pyramid shaped solid part incorporating the hole in itself. The correlation between the working part section surface and that of the grip section surface is: Ssp/Swp = 4.5. 7.5 where: Ssp-section of the solid part, Swp-section of the working part.

Further features and advantages of the present invention will be disclosed and discussed in detailed description of the invention. Reference is made in this respect to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings: FIG. 1/7 shows side view in working position of the interdental wedge of this invention with cylindrical hole incorporated in its grip.

FIG. 2/7 shows a top view in working position of the interdental wedge of this invention with elliptic hole incorporated in its grip.

FIG. 3/7 shows side view in working position of the interdental wedge of this invention with cone shaped hole incorporated in its grip.

FIG. 4/7 shows a view from the tip of the interdental wedge of this invention with crosswise vertical trapezoidal section of its grip.

FIG. 5/7 shows a top view of the interdental wedge of this invention with horizontal trapezoidal section of its solid part and prismatic hole incorporated in its grip.

FIG. 6/7 shows side view of the interdental wedge of this invention with vertical trapezoid section of its grip.

FIG. 7/7 shows side view of the interdental wedge of this invention with sloping posterior wall of its grip.

DESCRIPTION OF THE INVENTION AND ITS ADVANTAGES The essence of this invention is the interdental wedge made of homogeneous transparent material which has a triangle prismatic shaped working part. All three walls of this part are micro roughened. The anterior end of the wedge finishes with ski like arch. The posterior end of the wedge has a shape of the prism or cut pyramid having the hole inside. Characteristic for the design of the interdental wedge is, that the correlation between the working part section surface and that of the grip section surface is: Ssp/Swp = 4.5-7.5 where: Ssp-section of the solid part, Swp-section of the working part.

Advantages of the described invention are as follows: In comparison with first described wedge, the new interdental wedge has simplified design of the working part and due to the hole inside its solid part is much more convenient for holding, insertion and removal from interdental space. The new interdental wedge can be securely hold from three different sides which enables its easy insertion either from buccal, lingual or palatinal direction.

In comparison with second described wedge, the new interdental wedge main advantage is simplified form, structure and manufacturing technology, while demonstrating similar light conducting and light dispersion capabilities. The new wedge is definitely easier for holding and insertion. There is no risk the wedge to slip off from interdental space after it has been inserted, thanks to the roughness of the triangle prismatic body walls and edges. The new interdental wedge demonstrates higher friction coefficient which makes adherence of the wedge to neighboring structures and teeth separation better.

The micro roughness of the working part of the new interdental wedge makes possible the dissipation of the light equally in all directions. This feature leads to full curing of the whole volume of the light curing synthetic material placed in tooth cavity.

Compared to the third described wedge, the new interdental wedge has simplified design of both -its working and its holding parts. Application of the new wedge does not require usage of any specially designed instruments and is simple, convenient and secure. Additional advantage is significantly enlarged surface at the entrance of the light beam and better dispersion of the light thanks to a great number of light reflecting micro irregularities on the triangle prismatic shaped working part walls. These features of the new wedge guarantee increased intensity of the light inside the wedge and after dispersion inside the light curing material, too.

Compared to the forth described wedge, the new interdental wedge has more simple shape of the holding part without this affecting the security and convenience during insertion or removal of the wedge. Significantly enlarged effective surface of the solid part through which the light beam reaches the working triangle prismatic body ensures increased intensity of the light inside the wedge and through dissipation thanks to micro roughness of the walls inside the light curing synthetic material, too. Thus new wedge design helps the full polymerisation of approximaly located filling material to be achieved.

EXAMPLES OF THE INVENTION n FIG. 1/7 demonstrates a sample of the wedge of this invention, which has a triangle prismatic shape of its working part ending similarly to a tip of ski (1). In the posterior part called holding part interdental wedge is shaped like a prism (2) inside which a cylindrical hole (3) is made. The surface of the two walls (5), edge (4) and the surface of the wall (8) have been micro roughened.

Second variant of the wedge of this invention is shown on FIG. 2/7 where the hole has a shape of the ellipse.

Another variant of the wedge of this invention shown on FIG. 3/7 there is a cone shaped hole in prismatic body (2).

Variants shown on FIGS. 5/7, 6/7 and 7/7 the body (2) has trapezoidal sections and differently shaped holes may be made.

APPLICATION OF THE INVENTION After the wedge is inserted the base (8) is in contact with interdental papilla. One of the walls (5) is in contact with the approximal surface of the neighboring tooth, while the other wall (5) is in close contact with transparent matrix placed around the crown of the treated tooth. The edge (4) of the interdental wedge of this invention could slightly deform which increases the contact pressure between the wedge and the matrix towards the treated tooth. When the wedge is inserted in its final position the edge (6) additionally exerts pressure on the matrix and creates new fixing forces. Towards the back wall (7) the dentist guides the light beam and achieves the polymerisation of the light curing filling material.

References 1. U. S. Pat. 4631030 A61C007/00 (U. S. Class: 433/149) 2. U. S. Pat. 5743738 A61C007/00 (U. S. Class: 433/149) 3. U. S. Pat. 5890901 A61C007/00 (U. S. Class: 433/149) 4. Interdental wedge manufactured by MABEGE GmbH-Germany