SU904686A1 - Forceps for cutting out crowns - Google Patents

Description

(54) NIPPERS FOR CUTTING CROWNS

The invention relates to medical technology, namely to dental instruments, and can be used when cutting a crown with both vestibular, oral chewing and cutting surfaces. Known forceps for cutting crowns, containing pivotally connected handles and sponges, on one of which a knife with a clamping screw is mounted, and on the other - a support pad 1. "However, when using a {known instrument, it does not seem possible to set the bearing pad exactly to the size of the thickness of the crown being cut. As a result, when cutting, the knife slides off the crown, destroying the tooth under the crown or blunted and cutting the knife's edge. In addition, these forceps after cutting leave large barbs. The aim of the invention is to provide atraumatic removal of crowns. This goal is achieved by the fact that in the forceps for cutting crowns containing hinged handles to a jaw, on one of which there is a knife with a pressing screw, and on the other - a supporting platform, the knife is made with a cocked form with protrusions, and a supporting platform It is made with an oval spherically concave recess with pointed edges located at an angle of 10-15 ° with respect to the sponge, with the supporting area to the knife at an angle of 50-70 with respect to the plane of the handle. In addition, there are two studs with splines and a spring on the handle to open the handle. FIG. 1 shows forceps for cutting crowns, front view with partial sections in FIG. 2 onozh; in fig. 3 is a view A of FIG. 1) in FIG. 4 is a section BB in FIG. 1) in FIG. 5 is a sectional view BB in FIG. 2 for different types of knife sharpening: a - left-sided, b - right-sided, and c - double-sided. The tongs have hinged handles 1 and 2 and, correspondingly, working jaws. A knife 3 is installed on the sponge of the handle 1 with a clamping screw 4, there is a support pad 5 on the handle 2 sponge. To limit and adjust the degree of compression of the handle, two thrust pins 6 are mounted on them. The studs are made with splines 7, the spring 8 is mounted on the studs The knife 3 is made with a coraine-shaped tooth 9 with lamella-shaped protrusions 10 and is firmly fixed in the desired position by one of two diametrically located pro-holes made in the cylindrical part of the knife. The support platform 5 is made with an oval spherically concave recess with pointed edges arranged at an angle of 10-15 relative to the sponge. The support platform 5 and the knife 3 are located at an angle of 50-70 with respect to the plane of the handle,

Tongs work as follows.

To cut the crown, a prong with double-sided sharpening of the knife 3 mouth is poured under the edge of the crown. In this case, the support pad 5 with a pointed edge is placed on the chewing or side surface of the cut crown in the desired position. As the handle 1 n 2 squeezes, the coracle tooth 9 of the knife enters between the edge of the crown and the tooth and cuts the crown. Following the tooth, a knife 10 protrusion 10 of the knife is inserted into the slot between the tooth and the crown, which bends the cut edges of the crown, while preventing the tooth from sliding off the crown. The beak-shaped form of the tooth allows it to be placed under the crown without the gum trail. When the handles of the tongs are maximally compressed, the tooth of the knife 3 enters the spherically concave cavity of the support pad 5. Thus, the crown is cut and the tooth of the knife is released from under the crown.

For a clean and complete separation of the crown from a number of located and

Crowns knitted between each other, knives i are made with left-handed and right-handed sharpening. The type of knife is selected depending on the location of the crown and its place of separation J (Fig. 5).

For ease of use with tongs, use a set of two tongs that are different from the right and left side of the knife.

n And reference sites.

The design of the forceps allows cutting crowns not only from the vestibular but also from the oral, chewing and cutting surfaces. The tongs provide atraumatic, easily removable crowns.

Claims (2)

Claim 1. Crimping tools for cutting crowns, containing articulated hands and sponges, on one of which a knife with a clamping screw is mounted, and on the other - a supporting platform that is characterized by the fact that atraumatic crowns are atraumatic. the knife is made of a coraciform shape with lem-like protrusions, and the supporting platform is made with an oval spherically concave recess with pointed edges, located & and at an angle of 10-15 relative to the sponge, the base and the knife are at an angle of 50-70 with respect to the plane of the handle. 2. Nippers according to claim 1, characterized in that the handle has two studs with slots and a spring to open the handle. Sources of information taken into account in the examination 1. USSR author's certificate No. 308755, cl. A 61 C 3/16, 1970. Jk  Phi1.2 bida BS W d ten FIG.