Dental matrix tensioner

Details Dental matrix tensioner Dental matrix tensioner

1994-06-20

1997-05-06

Yan, Ren

Dentistry

Apparatus

Hand manipulatable implement

433 39, A61C 504

Patent

active

056264755

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to the field of devices for the application and the tightening of matrices for dental reconstructions in odontology.


BACKGROUND OF THE INVENTION

Among such devices, the most advanced to date include a matrix tightener comprising a turning pin attached to a casing within which the pin itself pulls the matrix in its rotation, placing it into tension, and a tightening device that can be attached to the above-mentioned pin when the matrix tightener is already applied with the relative matrix around the tooth, so as to be capable of making it rotate while tightening the matrix and making it adhere to the outer walls of the tooth itself.
An example of device made in this way is provided by U.S. Pat. No. 4,396,374, for example.
The drawback that is encountered in the use of device of this type is that of the insufficient ease of handling: in fact it is necessary to first apply the matrix tightener and the matrix, with the matrix not yet in tension, while manually maintaining in position in the oral cavity, and then to insert the tightening device by attaching it the matrix tightener, while still manually holding the matrix, until it has been placed in tension. All this involves significant practical difficulties and a situation of prolonged discomfort for the patient.
The inventor of the present invention has attempted to eliminate this drawback by working out a unit including both a matrix tightener and a turnbuckle which can be made integral, so that the matrix can be applied, maintained in the correct position and tightened merely by inserting and subsequently activating the tightening device, which moves with itself the matrix which is integral with it.


Object of the Invention

The object of the invention is thus a unit comprising a matrix tightener and a tightening device for use in dentistry composed of a matrix tightener including a pin equipped with a slot for the introduction of the ends of the matrix and with a casing also equipped with slot, which holds the pin within itself, and with a tightening device that can be attached to said pin and capable of making the pin rotate, by the fact that the matrix tightener and the tightening device are equipped with means of attachment capable of making them integral in a reversible manner.


BRIEF DESCRIPTION OF THE DRAWINGS

A detailed description of the functioning of the invention as a unit according to some preferred embodiments will now follow, with reference being made to the attached drawings:
FIG. 1 represents an enlarged transparent view of an embodiment of the matrix tightener in the unit according to the invention;
FIG. 2 represents one of its cross-sections;
FIG. 3 represents the enlarged lateral view of only the pin of the above-mentioned matrix tightener, in which the teeth of the toothed member applied to one of its ends have not been drawn;
FIG. 4 represents the enlarged view from above of a preferred embodiment of the above-mentioned toothed member;
FIG. 5 represents the longitudinal section of an embodiment of the tightening device at the moment at which it is joined to the matrix tightener;
FIG. 6 represents a detailed view from which it is possible to deduce the position of the small connecting rod with two winches at that moment which contributes to effecting the blocking of the matrix tightener onto the tightening device in FIG. 5;
FIG. 7 represents the longitudinal section of the tightening device itself which it has been made integral with the matrix tightener, thereby constituting the unit according to the invention;
FIG. 8 represents a detailed view with the position of the above-mentioned connecting rod in the situation depicted in FIG. 7;
FIG. 9 represents another preferred embodiment of the unit according to the invention seen along a longitudinal section with the tightening device and the matrix tightener having been made integral with one another;
FIG. 10 represents the enlarged view of the area of joining between the matrix tightener and the tightening device in the embodiment of F

REFERENCES:
patent: 1202698 (1916-10-01), Ford
patent: 1359665 (1920-11-01), Borkin
patent: 2995822 (1961-08-01), Tofflemire
patent: 4202103 (1980-05-01), Zall et al.
patent: 4396374 (1983-08-01), Ericson
patent: 4915627 (1990-04-01), Hirdes
patent: 5055045 (1991-10-01), Dickie et al.
patent: 5342197 (1994-08-01), Stein et al.

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